Site log - Houston (November 1998) Flags: 1-Satellite coincidence data 2-Scan in TSDIS data 3-Scan not in TSDIS data A-Major problem (moderate to strong AP > 25 dBZ &/or widespread coverage > 10%) B-Minor problem (weak AP &/or very litte coverage) NOTE: Asterisks surrounding satellite coincidence times &/or distances denote overpasses originally affected by bad satellite coincidence tables. Only affects Houston data passed to TSDIS from 980901 thru 981111. **************************************************************************************** 01 Nov 98: Light, scattered precip after 0430Z. A few intense cells form after 13Z. Leading edge of MCS moves in from W after 14Z. MCS moves through the radar scope from W to E for rest of the day. Some intense embedded convection and lots of light to moderate stratiform precip associated w/ the MCS. Data processed: 0002-2355Z Satellite Coincidence: 0138Z(118 km), 0315Z(598 km), 0452Z(499 km), 0628Z(158 km) QC notes: 0002-0433Z: Chaff-like echo persists. No real precip w/in 150 km. ----> Corrected. 0438-0639Z: Precip in SW quadrant, some chaff remains to NE. 1B, 2B, 3B !!FLAG!! ----> Precip is very light & shallow, so raising params removes some small showers. Also, a few specks of light spurious echo remain. Difficult to find the perfect set of params in this scenario, but both spurious echo and precip are light. 0654Z: Precip to W and SW, some very light chaff to NE. ----> Corrected. 0704-0709Z: Precip to W and SW, some very light chaff to NE. ----> Corrected. 0739-0744Z: Precip to W and SW, some very light chaff to NE. ----> Corrected. 0754-0835Z: Precip to W and SW, some very light chaff to NE. ----> Corrected. 1844-1859Z: Embedded clutter speck to W of radar. 3A !!FLAG!! ----> Speck is embedded in light precip, then gets covered by intense precip afterwards. *Clutter Range: w/in 25 km. 1934-2355Z: Hole in precip surrounding radar. Also some potential light spurious echo to extreme W after about 20Z. 2B, 3B !!FLAG!! ----> Some improvements made, but flagged for some light precip that is removed in a few VOSs. Also, there are still additional problems in the following VOSs: 3B+ !!FLAG!! ====> 2109-2129Z: Embedded clutter specks near radar. *Clutter Range: w/in 25 km. 2B+,3B+ !!FLAG!! ====> 2229-2250Z: Embedded clutter specks near radar. *Clutter Range: w/in 25 km. 3B+ !!FLAG!! ====> 2305-2325Z: Embedded clutter specks near radar. Also light spurious echo to SW at 2325Z. *Clutter Range: w/in 25 km. *CAE Range: near 150 km. % of data reprocessed: 139/275 VOSs = 51% **************************************************************************************** 02 Nov 98: Some intense convection and scattered light to moderate precip early in the day associated w/ MCS described in previous day. Remnants of the MCS move out by 08Z. Data processed: 0000-2351Z Satellite Coincidence: 0026Z(251 km), 0202Z(457 km), 0339Z(615 km), 0516Z(190 km), 0652Z(733 km), 2313Z(701 km) QC notes: 0050-0331Z: Scattered, light AP to W & NW. 1B, 2B, 3B !!FLAG!! ----> Corrected, but still may be some spurious echo on fringes of precip when precip is embedded in it. 0336-0401Z: Scattered, light AP to W & NW. Also some intense AP to SW. ----> Corrected. 0407-0541Z: Scattered, light AP to W & NW. Also some intense AP to SW. 1A, 2A, 3A !!FLAG!! ----> AP too intense (& has some vertical depth) to remove w/o eliminating all precip to E. Some improvements, but still a major problem. 0546-0601Z: Scattered, light AP to W. ----> Corrected. 0606-0752Z: Scattered light to intense AP to W. ----> Corrected inside 150 km. 0757-1441Z: AP, sometimes widespread and intense, w/o any precip inside 150 km. ----> Corrected. 2004-2202Z: Small moderate to intense speck of strange echo to NE. ----> Corrected. % of data reprocessed: 174/231 VOSs = 75% **************************************************************************************** 03 Nov 98: No precipitation. Data processed: 0001-2359Z Satellite Coincidence: 0050Z(210 km), 0226Z(618 km), 0403Z(444 km), 0540Z(277 km), 2337Z(134 km) QC notes: 0239Z: Light patch of spurious echo. ----> Corrected. 0545-0704Z: Light remnants of CAE shield to NW. ----> Corrected. 0843Z: Light patch of spurious echo. ----> Corrected. 0903-1457Z: Light remnants of spurious echo, w/ some moderate to intense specks. ----> Corrected. % of data reprocessed: 48/146 VOSs = 33% **************************************************************************************** 04 Nov 98: No signicicant precipitation within 150 km of radar. Data processed: 0011-2358Z Satellite Coincidence: 0114Z(509 km), 0250Z(592 km), 0427Z(99 km), 2225Z(563 km) QC notes: 0011-1109Z: Scattered, mostly light, spurious echo. ----> Corrected. 1239-1430Z: Scattered, mostly light, spurious echo. A lone shower to extreme SW beyond 150 km. ----> Corrected. % of data reprocessed: 87/207 VOSs = 42% **************************************************************************************** 05 Nov 98: A few regions of light to moderate precip move in from W after 3Z, but most precip dissipates before reaching the radar. A larger shield of precip enters from W after 06Z and holds together for many hours, moving S of the radar by 11Z and out of the radar scope by 14Z. A few left over showers to S/SE after 15Z, but not significant. Data processed: 0013-2341Z Satellite Coincidence: 0001Z(292 km), 0138Z(629 km), 0314Z(381 km), 0451Z(402 km), 2249Z(23 km) QC notes: 0023-0042Z: A few specks of spurious echo. ----> Corrected. 0907-0912Z: Clutter speck to NW. ----> Corrected. 0917-1158Z: Hole in precip surrounding radar. Also some embedded clutter specks. 2A-, 3A- !!FLAG!! ----> Hole corrected, but persistent, often intense specks cannot be readily removed w/o severely impacting real precip. CLUTTER RANGE: near 45 km to NW, w/in 25 km elsewhere. 1203-1258Z: Embedded clutter specks. 2A-, 3A- !!FLAG!! ----> A few specks improved in a couple of VOSs, but some specks are too difficult to remove. CLUTTER RANGE: w/in 25 km surrounding radar. 0500-1359Z: After the reprocessing was completed from the previous time periods, range dependenti holes and gaps in the second tilt images was also observed. ----> Corrected. % of data reprocessed: 63/265 VOSs = 24% **************************************************************************************** 06 Nov 98: Some scattered, extremely light echoes move quickly from SW to NE after 15Z. Data processed: 0011-2359Z Satellite Coincidence: 0025Z(553 km), 0202Z(560 km), 0339Z(5 km), 2136Z(426 km), 2313Z(368 km) QC notes: 0140-0159Z: Light CAE specks. ----> Corrected. 1300-1349Z: Light spurious echo specks. ----> Corrected. % of data reprocessed: 9/146 VOSs = 6% **************************************************************************************** 07 Nov 98: Scattered light showers through 09Z, then a few moderate to intense cells to the N after 10Z. A small lull in the action after 12Z, then some additional scattered showers and convection after 15Z. Overpass at 2200 catches a small convective system to WSW of radar, as well as light precip to NW. Data processed: 0009-2357Z Satellite Coincidence: 0049Z(630 km), 0226Z(307 km), 0402Z(537 km), 2200Z(80 km), 2337Z(587 km) QC notes: 2206-2357Z: Some holes & chunks in precip as it nears radar. ----> Corrected, but some clutter specks are embedded in the following VOSs: 1A- !!FLAG!! ====> 2331-2357Z: Embedded clutter specks. *CLUTTER RANGE: w/in ~40 km. % of data reprocessed: 23/253 VOSs = 9% **************************************************************************************** 08 Nov 98: A broken line of scattered showers and heavier convective cells persists from 00-14Z. Line breaks up near 15Z, with only a dissipating convective system to SE through 17Z. Data processed: 0002-2359Z Satellite Coincidence: 0113Z(518 km), *0250Z(117 km)*, *2047Z(303 km)*, 2224Z(432 km) QC notes: 0002-0247Z: Light showers embedded in a shield of light CAE to W and NW of radar. 1B, 2B, 3B !!FLAG!! ----> A broad, minor flag for this period. After some experimenting, the default params were not changed. Some light spurious echo and specks are picked up as light, small showers move to W/NW of radar, but not much can be done to improve the situation w/o affecting real precip. *AP RANGE: w/in 100 km. *CLUTTER RANGE: w/in 25 km. Following VOSs have embedded clutter specks (no reprocessing attempted): 2A, 3A !!FLAG!! 0652-0712Z 2A, 3A !!FLAG!! 0732-0807Z 3A !!FLAG!! 0827Z 3B !!FLAG!! 0837Z 3A !!FLAG!! 1007-1017Z 2A, 3A !!FLAG!! 1037-1222Z *CLUTTER RANGE: w/in 25 km. % of data reprocessed: 33/276 VOSs = 12% **************************************************************************************** 09 Nov 98: A few scattered, mostly light, echoes after 06Z. A N-S broken line of light showers (a few moderate cells, too) after 17Z. This line breaks up by 20Z and only a few scattered showers remain. Data processed: 0004-1251Z 1706-2357Z Satellite Coincidence: 0001Z(621 km), 0137Z(*229 km*), 0314Z(674 km), 2111Z(*175 km*), 2248Z(*612 km*) QC notes: 0004-0500Z: Scattered light to intense AP specks and patches. No signficant precip echoes w/in 150 km. :w ----> Corrected. 1706-2012Z: Chaff echoes to the E. Looks like real precip in a N-S line near radar. 2A-, 3A- !!FLAG!! ----> Cannot remove chaff w/o severely affecting line of precip nearer to radar. Chaff has vertical continuity and is located at further ranges than the precip, thus making this situation very difficult (and chaff is as or more intense than actaul precip). Chaff is not too widespread, but still flagged as a significant problem since it persists for three hours. 2357Z: Small patch of spurious echo o W. ----> Corrected. % of data reprocessed: 99/232 VOSs = 43% **************************************************************************************** 10 Nov 98: A few lines of mostly light showers before 09Z. After 09Z, numerous bands of precip form, some containing embedded intense convection. An impressive convective line forms to SE near 15Z. Most precip exits the radar scope by 20Z Data processed: 0007-2355Z Satellite Coincidence: 0025Z(467 km), 0201Z(230 km), 1959Z(179 km), 2136Z(490 km), 2312Z(602 km) QC notes: 0023-0108Z: CAE to NE. ----> Corrected. 1235-1240Z: Light patches of AP to in NW quadrant. 3B !!FLAG!! ----> Any attempt to remove AP at such long ranges (w/ precip closer in that's just as intense as the AP) resulted in creating obvious scattered range-dependent holes in light precip. Thus, params aren't changed and period is flagged. *AP RANGE: near 150 km. 1245Z: Light to moderate patches of AP to in NW quadrant. 3A !!FLAG!! ----> Same as last period, except more intense. *AP RANGE: near 150 km. 1251Z: Same as last period. 3B !!FLAG!! ----> Light AP remains. *AP RANGE: near 150 km. 1256-1311Z: Intense AP to N. 3A+ !!FLAG!! ----> Same situation as previous period, only AP is very intense. Using 1321Z in 1C.HDF since the AP is much less intense. *AP RANGE: 130-150 km. 1316-1446Z: Light to moderate AP scattered in W, N, and NE. Also evidence of a hole in light precip surrounding radar after 1357Z. A few holes and gaps in precip outside 50 km to SW, too. 2A-, 3A- !!FLAG!! ----> Same as previous periods. Using 1452Z in 1C.HDF. *AP RANGE: 130-150 km. 1452-1557Z: A few holes and gaps in precip away from radar. ----> Corrected. 2326-2355Z: Light CAE to N/NW. ----> Corrected. NOTE: Including 1321Z in 1C.HDF instead of 1301-1316Z. Including 1452Z in 1C.HDF instead of 1432-1446Z. % of data reprocessed: 56/259 VOSs = 22% **************************************************************************************** 11 Nov 98: Light echoes to S late in the day. Not widespread or significant. Data processed: 0015-2346Z Satellite Coincidence: 0049Z(135 km), *1847Z(616 km)*, *2023Z(261 km),* *2200Z(626 km)*, *2336Z(406 km)* QC notes: 0015-2256Z: Combination of mostly light shield of CAE &/or AP specks and splotches. No precip w/in 150 km. ----> Corrected. 2306-2326Z: Same as last period, but some light echoes (presumably meteorological) move just inside 150 km to the S. 2B , 3B !!FLAG!! ----> Spurious echo to N is just as intense as presumed real echo to S, also just as deep. Thus, any attempts to selectively remove spurious echo and keep precip intact are almost impossible w/o some sort of sector specific QC capabilities. CAE RANGE: 130-150 km. 2336-2346Z: Larger shield of CAE to N and NE. 2B+, 3B+ !!FLAG!! ----> Same as previous period, only a more significant problem since spurious echo is more widespread than precip. CAE RANGE: 130-150 km. % of data reprocessed: 144/144 VOSs = 100% **************************************************************************************** 12 Nov 98: Scattered, light echoes early in the day. After 08Z, a few heavier cells develop. After 10Z, a multicell convective system enters from the NW. Over the next few hours, a NE-SW band of moderate to heavy precip continues sliding further into the radar scope from the W and NW. Embedded convection within a broader stratiform continues through 20Z. The convective system continues building on its SW flank as new convection continues to form and reinvigorate the system. By 23Z, a large area of moderate to heavy precip covers most of the NW quadrant. Good TRMM overpass at 1911Z. Data processed: 0006-2347Z Satellite Coincidence: *0113Z(353 km)*, 1911Z(63 km), 2047Z(538 km), 2224Z(573 km) QC notes: 0006-0105Z: Scattered light patches and specks of CAE w/ some light precip echoes, too. 1B, 2B, 3B !!FLAG!! ----> Difficult to remove spurious echo while keeping precip echo to S since they're same intensity and range (& precip isn't deep). Spurious echo is light, though, and < 10% coverage. CAE RANGE: 130-150 km. 0115-0459Z: Scattered light patches and specks of CAE w/ some light precip echoes, too. 1B, 2B, 3B !!FLAG!! ----> Difficult to remove spurious echo while keeping precip echo to S since they're same intensity and range (& precip isn't deep). Spurious echo is light, though, and < 10% coverage. CAE RANGE: Generally between ~35-100 km. 0950-1107Z: Embedded clutter specks near radar. Also light precip near radar missing at 1005Z. 2A, 3A !!FLAG!! ----> Clutter cannot be removed since it's embedded in precip. CLUTTER RANGE: near 45 km to NW, near 20 km to W 1302-1533Z: Some light/shallow precip missing. ----> Corrected. 1538-1543Z: Some light/shallow precip missing. Also embedded clutter speck near radar. 3A !!FLAG!! ----> Intense speck cannot be removed. CLUTTER RANGE: 20 km. 1548-1638Z: Some light/shallow precip missing. ----> Corrected. 1643-1827Z: Some light/shallow precip missing. Also embedded clutter speck near radar. 2B, 3B, 2A, 3A !!FLAG!! ----> Light to intense clutter throughout period. CLUTTER RANGE: w/in 30 km to W, ~45 km to NW. 2002-2007Z: Clutter speck to NW near radar. 2A , 3A !!FLAG!! ----> Unable to remove clutter. CLUTTER RANGE: w/in 30 km. 2027-2347Z: Hole in precip near radar. Also embedded clutter specks near radar. 1A , 2A , 3A !!FLAG!! ----> Clutter almost constantly embedded in precip near radar. CLUTTER RANGE: w/in 30 km. % of data reprocessed: 166/273 VOSs = 61% **************************************************************************************** 13 Nov 98: Band of widespread moderate to heavy precip lingers for much of the day. Band slides off to ESE after 20Z, but new pockets of precip move in for rest of the day. Good TRMM overpass at 0001Z. Data processed: 0002-2352Z Satellite Coincidence: 0001Z(34 km), *1759Z(474 km)*, *1935Z(342 km)*, *2112Z(630 km)*, *2248Z(334 km)* QC notes: 0002-0412Z: Hole in precip near radar. 1A, 2A, 3A !!FLAG!! ----> Corrected the hole, but clutter specks remain embedded in precip. RANGE: w/in 25 km. 0617-0759Z: Hole in precip near radar. ----> Corrected the hole, but embedded clutter specks remain during the following time periods: 2A, 3A !!FLAG!! ====> 0617-0739Z RANGE: w/in 25 km. 0914-2352Z: Various holes and gaps in precip. Not serious, but reprocessing is easy since there's not widespread spurious echo. Embedded clutter specks during following times: 2A, 3A !!FLAG!! ====> 1249-1530Z 2A, 3A !!FLAG!! ====> 1745-2031Z 1A, 3A !!FLAG!! ====> 2125-2135Z 3A !!FLAG!! ====> 2347-2352Z RANGE: w/in 25 km, & ~45 km to NW in a few VOSs. % of data reprocessed: 236/274 VOSs = 86% **************************************************************************************** 14 Nov 98: Early on, scattered pockets of light to moderate precip w/ some embedded intense convection. After 05Z, a band moderate to heavy precip moves from SW to NE. By 10Z, the NW half of the radar scope is covered by moderate to heavy precip. Areal coverage decreases after 12Z, and by 16Z, precip is scattered again (and lighter in intensity). A couple thin lines of light to moderate precip briefly flare up to SE after 21Z. Data processed: 0007-2358Z Satellite Coincidence: *0025Z(489 km)*, 1822Z(45 km), 1959Z(576 km), 2136Z(534 km), 2312Z(74 km) QC notes: 0007Z: Partial scan. Not included in 1C.HDF. 0012-0057Z: A few chunks of light precip missing, mostly on back edges. 2A, 3A !!FLAG!! ----> Corrected missing light precip, but clutter specks are embedded in precip near radar. CLUTTER RANGE: w/in 25 km. 0202-0959Z: Various holes and gaps in precip. ----> Holes in precip corrected, but following periods have embedded clutter specks. 2A, 3A !!FLAG!! ====> 0409-0629Z CLUTTER RANGE: w/in 25 km. 2B, 3B !!FLAG!! ====> 0824-0839Z CLUTTER RANGE: near 45 km to NW. 2A, 3A !!FLAG!! ====> 0855-0910Z CLUTTER RANGE: w/in 25 km, & near 45 km to NW. 1024-1105Z: Intense clutter speck embedded in precip. 2A, 3A !!FLAG!! ----> Although small, the speck is intense and persistent and cannot be removed w/o affecting precip. CLUTTER RANGE: near 20 km. 1110-1325Z: Hole in precip near radar...a few missing chunks of precip on back edges. 2A, 3A, 2B, 3B !!FLAG!! ----> Holes in precip corrected, but embedded clutter specks remain. CLUTTER RANGE: w/in 25 km. 1355-1405Z: Embedded clutter speck to NW. 3A !!FLAG!! ----> Although small, the speck is intense and persistent and cannot be removed w/o affecting precip. Using 1410Z in 1C.HDF instead of 1400 and 1405Z. CLUTTER RANGE: near 45 km. 3A !!FLAG!! 1415-1420Z: Same as 1355-1405Z. CLUTTER RANGE: near 45 km. 3A !!FLAG!! 1541-1556Z: Same as 1355-1405Z. CLUTTER RANGE: near 45 km. 1A !!FLAG!! 1826Z: Same as 1355-1405Z. CLUTTER RANGE: near 45 km. 1927-2358Z: Chunks of light precip missing. Very minor problem. ----> Holes in precip corrected, but embedded clutter specks remain in following VOSs: 2A, 3A !!FLAG!! ====> 1932-1942Z CLUTTER RANGE: w/in 25 km. NOTE: 0007 & 0604 moved to bad_vos directory. Including 1410Z in 1C.HDF instead of 1400 & 1405Z. % of data reprocessed: 188/285 VOSs = 74% **************************************************************************************** 15 Nov 98: Scattered patches of precip rotate around apparent center of low pressure through 10Z. Mostly light to moderate precip w/ a few cores of heavier convective activity. Data processed: 0008-2342Z Satellite Coincidence: 1710Z(*345 km*), 1846Z(410 km), 2023Z(625 km), 2200Z(256 km), 2336Z(624 km) QC notes: 1802Z: Moderate AP speck to E near 150 km. ----> Corrected. 2312-2342Z: Light patches of spurious echo to NW. ----> Corrected. % of data reprocessed: 5/275 VOSs = 2% **************************************************************************************** 16 Nov 98: No precip echoes. Data processed: 0002-2342Z Satellite Coincidence: 1734Z(159 km), 1910Z(*604 km*), 2047Z(*488 km*), 2224Z(188 km) QC notes: 0002-0051Z: CAE echo to NW. ----> Corrected. 0150Z: Light radial spike to NW. ----> Corrected. 0418Z: Light CAE patch to W. ----> Corrected. 1341Z: Light CAE speck to NW. ----> Corrected. 2313-2342Z: Light CAE all over. ----> Corrected. % of data reprocessed: 13/142 VOSs = 9% **************************************************************************************** 17 Nov 98: No precip echoes. Data processed: 0005-2359Z Satellite Coincidence: 1621Z(*226 km*), 1758Z(470 km), 1935Z(610 km), 2111Z(*174 km*) QC notes: 0005-0706Z: Light to moderate CAE, often widespread. ----> Corrected. 0755-0805Z: A few patches of light CAE. ----> Corrected. 0835Z: A few patches of light CAE. ----> Corrected. 1231-1253Z: Spurious echo...bird signature? ----> Corrected. 1310-1357Z: Scattered light to moderate CAE/AP specks. ----> Corrected. 1553Z: Light CAE speck. ----> Corrected. 1753Z: Light CAE speck. ----> Corrected. 1834Z: Light CAE speck. ----> Corrected. 2003-2359Z: Scattered CAE/AP specks. ----> Corrected. % of data reprocessed: 80/156 VOSs = 51% **************************************************************************************** 18 Nov 98: No precip echoes. Suspect echoes after 15Z are identified as chaff due to various factors: (1) begins as an intense point source, then disperses over time into streamers, (2) little vertical continuity, (3) movement similar to previous chaff cases, (4) satellite imagery confirms that no cloud formations are near KHGX late in the day. Data Processed: 0019-2344Z Satellite Coincidence: 1509Z(664 km), 1645Z(232 km), 1822Z(622 km), 1959Z(428 km), 2135Z(310 km) QC notes: 0019-0604Z: Light to moderate CAE, often widespread (or is it intense AP w/ clutter filter applied by NWS?!). ----> Corrected. 0643-0812Z: Light CAE. ----> Corrected. 0841Z: Light CAE. ----> Corrected. 0931Z: Light CAE. ----> Corrected. 1318Z: Light spurious echo to NE. ----> Corrected. 1636-2344Z: Light to intense chaff returns, plus some light CAE after 23Z. Chaff echo appears earlier, but is outside 150 km range. ----> Corrected. % of data reprocessed: 125/166 VOSs = 75% **************************************************************************************** 19 Nov 98: Scattered showers after 12Z, although there may be a few earlier in the day. Lots of chaff contamination. Data Processed: 0004-2349Z Satellite Coincidence: 1533Z(103 km), 1710Z(522 km), 1846Z(584 km), 2023Z(71 km) QC notes: 0004-0420Z: Mixture of chaff and AP. ----> Corrected. 0429-0821Z: Mixture of chaff, AP, CAE, and small, shallow showers. 2A, 3A !!FLAG!! ----> Awful period to QC. Since a few showers were so close to radar and shallow, height params couldn't be raised very high. Also, spurious echo is mostly outside 100 km with some vertical structure & very intense, thus very difficult to remove. RANGE OF SPURIOUS ECHO: mostly between 100-150 km. 0826-0841Z: Some light AP to NE. ----> Corrected. 1527-1543Z: Chaff to SE w/ scattered precip elsewhere. 1B !!FLAG!! ----> Chaff is very small and light, but difficult to remove. Raising params just eliminates precip and doesn't immediately remove chaff. Thus, left as is and flagged. CHAFF RANGE: near 140 km. 1548-1958Z: Chaff to SE w/ scattered precip elsewhere. 1A, 2A, 3A !!FLAG!! ----> Even more difficult to remove than previous time period since intensity and coverage increase. Thus, left as is and flagged. CHAFF RANGE: mostly 100-150 km. 2053-2349Z: Chaff to SE w/ scattered precip elsewhere. 1B !!FLAG!! ----> Chaff is very small and light. CHAFF RANGE: near 140 km. 2058-2349Z: Chaff to SE w/ scattered precip elsewhere. 2A, 3A !!FLAG!! ----> More intense and large areal coverage than previous period. Some improvements made, but still difficult to remove all chaff and keep all precip. CHAFF RANGE: between 100-150 km. % of data reprocessed: 94/239 VOSs = 39% **************************************************************************************** 20 Nov 98: Line of light showers moves in from NW after 07Z. Light showers pop up in SW quadrant after 09Z. Broken line to NW continues moving to SE, but largely washes out by 11Z. Meanwhile, light showers in S half of scope intensify into small, intense cells. By 13Z, a line of mostly broken convection is draped in ENE-WSW direction below radar. An MCS forms in S half and edges to ENE from 15-21Z as earlier convective line breaks apart. Light patches of precip behind the MCS after 21Z to S and SE. Data Processed: 0004-2358Z Satellite Coincidence: 1421Z(524 km), 1557Z(314 km), 1734Z(630 km), 1911Z(361 km), 2047Z(438 km) QC notes: 0004-0115Z: Mixture of small showers and chaff. ----> Some VOSs corrected inside 150 km, but the following VOSs are flagged: 3A !!FLAG!! ====> Chaff to SE near 150 km. Using 0019Z in 1C.HDF. 0120-0405Z: Chaff. ----> Corrected. 0415-0445Z: Scattered, light CAE. ----> Corrected. 0505-0640Z: Scattered light spurious echo w/in 150 km. Some intense AP specks outside 150 km. ----> Corrected. 0655Z: Light patch of CAE. ----> Corrected. 0705Z: Light patch of CAE. ----> Corrected. 1106-1326Z: Scattered patches of light spurious echo. Also some scattered precip. ----> Corrected, except for possible light CAE contamination in following VOSs: 2B, 3B !!FLAG!! ====> 1106-1311Z: Perhaps a few small specks of CAE scattered to N, NW, and SW. RANGE: between 100-150 km. 1922-1927Z: Clutter speck to NW embedded in light precip. 1A !!FLAG!! ----> Clutter is very small, but intense, thus flagged as major. RANGE: near 45 km. 1947Z: Clutter speck to NW embedded in light precip. 3A !!FLAG!! ----> Clutter is very small, but intense, thus flagged as major. RANGE: near 50 km. 2253-2358Z: Scattered light spurious echo. ----> Corrected. NOTE: Including 0019Z in 1C.HDF instead of 0004-0014Z. % of data reprocessed: 132/285 VOSs = 46% **************************************************************************************** 21 Nov 98: Light scattered precip to S and SE through 08Z, although much of it is outside 150 km. Scattered light to moderate precip enters from NW after 09Z. This precip gradually organizes into a band of moderate precip after 1330Z. Band largely holds together through 19Z, then all precip moves out of range by 21Z. Good TRMM overpass at 1444Z. Data Processed: 0004-2350Z Satellite Coincidence: 1444Z(5 km), 1621Z(*563 km*), 1758Z(550 km), 1934Z(31 km) QC notes: 0004-0219Z: Scattered patches of light CAE. ----> Corrected. 0626Z: Light patch of CAE. No precip w/in 150 km. ----> Corrected. 0636Z: Light patch of CAE. No precip w/in 150 km. ----> Corrected. 2327-2332Z: Scattered light spurious echo. ----> Corrected. 2340-2350Z: Scattered light spurious echo ----> Corrected. % of data reprocessed: 37/286 VOSs = 13% **************************************************************************************** 22 Nov 98: No precip. Data Processed: 0003-2346Z Satellite Coincidence: 1332Z(396 km), 1508Z(384 km), 1645Z(629 km), 1822Z(288 km), 1958Z(569 km) QC notes: 0006-0246Z: Scattered light CAE. ----> Corrected. 0315Z: Light CAE. ----> Corrected. 0345-0355Z: Light CAE. ----> Corrected. 0504Z: Light CAE. ----> Corrected. 2337-2346Z: Light spurious echo. ----> Corrected. % of data reprocessed: 37/158 VOSs = 23% **************************************************************************************** 23 Nov 98: No precip. Chaff after 16Z. Data Processed: 0006-2358Z Satellite Coincidence: 1356Z(104 km), 1532Z(594 km), 1709Z(506 km), 1846Z(142 km) QC notes: 0719-0838Z: Light to moderate AP specks to NE. ----> Corrected. 1027-1037Z: Light spurious echo to NE. ----> Corrected. 1056Z: Light spurious echo to NE. ----> Corrected. 1126-1156Z: Scattered light spurious echo. ----> Corrected. 1225-1302Z: Scattered light spurious echo. ----> Corrected. 1338Z: Light spurious echo to E. ----> Corrected. 1536-2358Z: Chaff and AP mix. ----> Corrected. % of data reprocessed: 108/191 VOSs = 57% **************************************************************************************** 24 Nov 98: Scattered showers after 0630Z. Data Processed: 0010-2354Z Satellite Coincidence: 1243Z(267 km), 1420Z(449 km), 1557Z(617 km), 1733Z(203 km), 1910Z(713 km) QC notes: 0010-0627Z: Persistent AP to NE and some remaining chaff. ----> Corrected. 0637-0815Z: Light to moderate AP to NE...appears to be a few light, shallow showers to W and NW, too. 2B, 3B !!FLAG!! ----> Most spurious echo corrected, but a few specks remain in some VOSs. Also flagged because some light precip echoes may have been removed. They are small and shallow and probably not significant. RANGE: scattered between 100-150 km. 1013-1023Z: Small, light specks of spurious echo. ----> Corrected. 1251-1350Z: Scattered light CAE. ----> Corrected. 1410-1429Z: Scattered light CAE. ----> Corrected. 1455Z: Scattered light CAE. ----> Corrected. 1612-1623Z: Chaff to S + light precip to W. 1B !!FLAG!! ----> Very difficult to remove chaff since it has some vertical structure and is as intense as precip to W/SW (and it's located at longer ranges). RANGE: ~125 km. 1629-2156Z: Chaff to S + light precip to W. 1A, 2A, 3A !!FLAG!! ----> Same as previous period, only chaff echo more intense and widespread. RANGE: between 100-150 km. 2202-2354Z: Chaff to S, light to intense AP to ENE, precip to W. 2A, 3A !!FLAG!! ----> Bad situation. Precip is still light and shallow. Other spurious echo is as or more intense than precip and located outside 100 km (making it more difficult to QC). Tried bumping up a few params, but precip gets eliminated and most of the false echo remains. Great case for sector QC option. No reprocessing done since it didn't help. RANGE: AP and chaff between 100-150 km. % of data reprocessed: 122/183 VOSs = 67% **************************************************************************************** 25 Nov 98: A few light showers before 02Z. Scattered, small convective cells after 17Z. Chaff early and late in the day. Data Processed: 0000-2350Z Satellite Coincidence: 1131Z(721 km), 1307Z(198 km), 1444Z(616 km), 1621Z(452 km), 1757Z(260 km) QC notes: 0000-0116Z: Light shower to W + Chaff to S + AP to E/NE. 2A, 3A !!FLAG!! ----> Keeping showers intact while removing other regions of spurious echo impossible w/o sector specific QC capability. Still some showers after 0116Z, but deemed insignificant since areal coverage is minimal and intensity less than 20 dBZ. Using 0023Z & 0122Z in 1C.HDF. RANGE: 80-150 km. 0122-0549Z: Chaff & AP w/o precip. ----> Corrected. 0618Z: Light spurious echo to NE. ----> Corrected. 1510Z: Moderate clutter speck near radar...w/in 15 km. ----> Corrected. 1540-1620Z: Chaff to S and SE. ----> Corrected. 1629-2153Z: Chaff to S and SE w/ precip to W/SW. 1A, 2A, 3A !!FLAG!! ----> Chaff contamination too intense and at too far a range to fully eliminate. RANGE: 100-150 km. 2159-2209Z: Chaff to S and SE w/ precip to W/SW. ----> Corrected. 2214-2229Z: Chaff to S and SE w/ precip to W/SW. 2B, 3B !!FLAG!! ----> Chaff contamination too intense and at too far a range to fully eliminate. RANGE: ~150 km. 2340-2350Z: Light spurious echo to W. ----> Corrected. Note: Including 0023Z in 1C.HDF instead of 0000-0017Z. Including 0122Z in 1C.HDF instead of 0105-0116Z. % of data reprocessed: 135/199 VOSs = 67% **************************************************************************************** 26 Nov 98: A few scattered showers early, then again to S and SE from 07Z-23Z. Data Processed: 0014-2348Z Satellite Coincidence: 1155Z(150 km), 1331Z(502 km), 1508Z(596 km), 1645Z(112 km) QC notes: 0014Z: Partial scan. Moved to bad files directory. 0018&0028Z: Light CAE to W w/ small shower directly to W of radar. 0033Z: Light CAE to W w/ small shower directly to W of radar. 0131Z: Light CAE to NW w/ small shower directly to W of radar. 0220-0259Z: Light CAE to NW. 0309-0318Z: Light CAE to NW and N. 0348Z: Light CAE to E. 0418-0428Z: Light CAE to NW 0507-0547Z: Scatttered light CAE. 0626Z: Light CAE to NW. 0656Z: Light CAE speck to N. 2242-2247Z: Light AP specks to E. ----> All above problems corrected. 2252-2307Z: AP to E w/ small showers to SW. 2B, 3B !!FLAG!! ----> Partial correction, only small speck of light AP inside 150 km. RANGE: near 150 km. 2313-2348Z: Intense AP splotch to ENE. Small shower persists to SW. 2A, 3A !!FLAG!! ----> Difficult to QC since AP is intense and at far ranges...also has some vertical continuity in a few VOSs, enough to make if hard to use height thresholds only to QC it. RANGE: 100-150 km. % of data reprocessed: 34/218 VOSs = 16% **************************************************************************************** 27 Nov 98: No significant precip echo w/in 150 km. Data Processed: 0038-2349Z Satellite Coincidence: 1042Z(584 km), 1218Z(279 km), 1355Z(628 km), 1532Z(392 km), 1708Z(381 km) QC notes: 0038-0308Z: Mostly light to moderate scattered CAE. 0328-0338Z: Mostly light CAE. 0357-0407Z: Light CAE. 0457Z: Light CAE. 0516Z: Light CAE. 0555Z: Light CAE. 0615Z: Light CAE. 0635-0705Z: Light CAE. 0734Z: Light CAE. 1250-1315Z: Light spurious echo. 1325Z: Light AP specks. 1340-1505Z: Light to moderate AP specks/splotches. 1725Z: Small, moderate AP speck. ----> All above problems corrected. % of data reprocessed: 68/176 VOSs = 39% **************************************************************************************** 28 Nov 98: Light scattered showers to W after 16Z. Data Processed: 0008-2349Z Satellite Coincidence: 1106Z(40 km), 1243Z(547 km), 1419Z(566 km), 1556Z(13 km) QC notes: 0018Z: Light specks of AP. ----> Corrected. 0147-1119Z: Scattered light to moderate AP to E/ENE. ----> Corrected. 1129-1440Z: Scattered patches of light to moderate AP to E/NE (a bit more severe than previous period). Also some light, small showers to SW and W. 1B, 2B, 3B !!FLAG!! ----> Corrected, although light precip is removed. Precip is small, very light, so not considered significant. Flagged as minor, though, since precip was eliminated. 1446-1539Z: AP lessens, but some light to moderate specks remain. Still very small, light showers to NW. 1B, 2B, 3B !!FLAG!! ----> Mostly corrected, although small showers may be removed to NW &/or small, light speck of AP may remain to SE. Not significant problems. RANGE: ~130 km. 2243-2253Z: Strange speck to SE near 150 km. 3B !!FLAG!! ----> Very light...actually moves light small shower, so it's very questionable. RANGE: near 150 km. 2258-2303Z: Same as previous period, but speck is intense. 3A !!FLAG!! ----> Again, echo to SE is questionable. Using 2308Z in 1C.HDF. RANGE: near 150 km. 2313Z: Light speck to SE. 3B !!FLAG!! ----> Same as 2243-2253Z. RANGE: near 150 km. 2318Z: Small, intense speck to SE. 3A !!FLAG!! ----> Same as 2253-2303Z. 2328-2349Z: Light AP speck to NE. 2B, 3B !!FLAG!! ----> Very light, not worth removing since light precip is removed, too. NOTE: 2308Z included in 1C.HDf instead of 2303Z. % of data reprocessed: 98/192 VOSs = 51% **************************************************************************************** 29 Nov 98: Scattered precip, mostly small showers and a few moderate to intense small convective cells, after about 16Z. Data Processed: 0004-2349Z Satellite Coincidence: 0954Z(446 km), 1130Z(357 km), 1307Z(630 km), 1444Z(318 km), 1620Z(516 km) QC notes: 0009Z: Light AP to NE. 1124Z: Light AP to NE. 1302Z: Radial spike to SE in 2nd tilt (solar?) 2309-2314Z: Radial spike to SW in 2nd tilt (solar?) ----> All problems corrected. % of data reprocessed: 5/188 VOSs = 3% **************************************************************************************** 30 Nov 98: Scattered precip for most of day. Mostly smaller cells, often organized into broken lines. A few solid lines with moderate to intense precip after 18Z. Data Processed: 0000-2044Z 2220-2345Z Satellite Coincidence: 1018Z(65 km), 1154Z(583 km), 1331Z(525 km), 1507Z(96 km) QC notes: 2235-2345Z: Scattered, light specks of CAE. ----> Corrected. % of data reprocessed: 15/267 VOSs = 6%