Site log - Hstn (Feb 1999) Flags: 1-Satellite coincidence data 2-Scan in TSDIS data A-Major problem (moderate to strong AP &/or widespread coverage) B-Minor problem (weak AP &/or very little coverage) ******************************************************************************* 01 Feb 99: A day free of precip related echo. Data Analyzed: 0028-2350Z Satellite Coincidence: 0202Z (172 km), 0339Z (611 km), 0516Z (469 km), 0652Z (226 km) QC notes: 1326Z: AP SW of radar -----> corrected 1505Z: AP SW of radar -----> corrected 1911Z: AP SE of radar -----> corrected % of data reprocessed: 3/143 = 2.1% ******************************************************************************* 02 Feb 99: Some very light echoes throughout the day. Nothing of any significance, though. Data Analyzed: 0010-2358Z Satellite Coincidence: 0050Z (182 km), 0226Z (488 km), 0403Z (603 km), 0540Z (138 km), 2338Z (619 km) QC notes: 0508Z: AP NE of radar -----> corrected 0757Z: Questionable echo S of radar, Could 2B !!FLAG!! be very light precip echo, or maybe light chaff remnants. Calling it light precip w/ a degree of uncertainty. RANGE: near 125 km. 0817Z-1026Z: Same as 0757, to S/SE. 2B !!FLAG!! -----> Flagged for uncertainty. RANGE: between 100-150 km. 1136Z: Same as previous problem. 2B !!FLAG!! -----> Flagged for uncertainty. RANGE: near 150 km. 1502Z-1536Z: AP W-E of radar -----> corrected 1627Z: AP NNE of radar -----> corrected 1758Z-2239Z: AP E of radar -----> corrected 2257Z-2307Z: AP E of radar -----> corrected 2316Z-2341Z: AP E of radar -----> corrected 2353Z: AP SW of radar -----> corrected ***Note: The problem on this day is identifying whether light echoes are precip-related or not...looking at synoptic map, there's a frontal passage near 12Z on this day, so I'm more inclined to think that the light echoes are precip/virga instead of chaff or clear air echo. % of data reprocessed: 77/208 = 37% ******************************************************************************* 03 Feb 99: Convective activity builds in from the south after 11Z and moves from SW to NE until around 19Z Data Analyzed: 0004-1953Z, 2106-2345Z Satellite Coincidence: 0114Z (259 km), 0251Z (626 km), 0427Z (408 km), 0604Z (351 km) QC notes: 0009Z-0456Z: Scattered AP...also echoes removed by defaults in the second tilt. -----> corrected 0639Z-0855Z: Scattered light echoes...are they real? 1B, 2B !!FLAG!! -----> Echoes left intact, although defaults remove some of the lightest echoes. This is a similar situation to 02 Feb 99. Time period flagged since there is some uncertainty as to whether the echoes are precip, false echo, or virga. A front is sitting to the SE over the Gulf, so it is plausible that these echoes are caused by the synoptic system. IR satellite confirms clouds/moisture in the region. 2B !!FLAG!! 0905Z-1024Z: AP to SW w/ precip. AP is generally light and not widespread inside 150 km range. RANGE: Generally outside of 130 km. 2B !!FLAG!! 1251Z-1331Z: AP w/precip, partially corrected, earns minor flag. RANGE: Near 150 km. 0649Z-1050Z: On second review, second tilt images show many chunks taken out by defaults. -----> corrected 1336Z-1441Z: Same as 0649-1050Z. -----> corrected % of data reprocessed: 115/232 = 50% ******************************************************************************* 04 Feb 99: A line of showers develops east of the radar after 7Z. Lines of showers continue to form to the east with some embedded convection and eventually move to the SW, pivoting around the radar site. This activity diminishes by 20Z. Data Analyzed: 0005-2349Z Satellite Coincidence: 0002Z (66 km), 0138Z (537 km), 0315Z (574 km), 0452Z (37 km), 2249Z (478 km) QC notes: 2045Z-2135Z: AP E of radar -----> corrected 2229Z-2234Z: AP SE of radar -----> corrected % of data reprocessed: 13/229 = 6% ******************************************************************************* 05 Feb 99: One band of showers enters region from SW after 3Z and moves north, dissipating by 10Z. Scattered showers redevelop after 18Z and also move north the remainder of the day. Data Analyzed: 0038-2359Z (Bad Scan at 0038 & 2358Z) Satellite Coincidence: 0026Z (340 km), 0203Z (631 km), 0339Z (336 km), 0516Z (485 km), 2313Z (42 km) QC notes: 0041Z-0214Z: AP E of radar -----> corrected 0224Z-0234Z: AP E of radar -----> corrected 0244Z: AP E of radar -----> corrected 0254Z-0319Z: AP E-W of radar -----> corrected 0324Z-0353Z: AP to W w/ precip moving in from S. -----> corrected 0358Z-0403Z: Same as previous period. 1B !!FLAG!! -----> Cannot remove all of the AP w/o removing precip. RANGE: near 150 km. 0408Z-0429Z: Same as previous period. 1A,2A !!FLAG!! -----> AP a bit more intense, thus flagged as a major problem. RANGE: 130-150 km. 1B,2B !!FLAG!! 0434Z-0509Z: Same as previous period, but AP not as intense inside 150 km. RANGE: 125-150 km. 1A,2A !!FLAG!! 0514Z-0519Z: AP of greater intensity W of radar RANGE: near 150 km. 1B,2B !!FLAG!! 0524Z-0539Z: AP W of radar w/precip RANGE: near 150 km. 0544Z-0604Z: AP W of radar. -----> corrected 0710Z-1005Z: Lighter shower activity eliminated by defaults -----> corrected 1741Z-2349Z: Lighter shower activity eliminated by defaults -----> corrected % of data reprocessed: 166/274 = 61% ******************************************************************************* 06 Feb 99: There are two periods of very light shower activity on this date - the first from 0-4Z and the second from 17-21Z. Data Analyzed: 0005-2350Z Satellite Coincidence: 0050Z (575 km), 0227Z (535 km), 0403Z (71 km), 2201Z (346 km), 2337Z (410 km) QC notes: 0005Z-0405Z: Lighter shower activity eliminated by defaults -----> corrected 1648Z-2054Z: Lighter shower activity eliminated by defaults -----> corrected % of data reprocessed: 92/203 = 45% ******************************************************************************* 07 Feb 99: Very light isolated showers occur primarily before 330Z and again between 1130 and 1430Z Data Analyzed: 0004-2343Z (Bad Scan at 0004Z) Satellite Coincidence: 0114Z (625 km), 0251Z (256 km), 0427Z (624 km), 2225Z (142 km) QC notes: 1903Z-2152Z: AP E of radar -----> corrected % of data reprocessed: 18/190 = 9.5% ******************************************************************************* 08 Feb 99: A day free of precip related echo. Data Analyzed: 0003-2359Z Satellite Coincidence: 0002Z (604 km), 0139Z (486 km), 0315Z (188 km), 2113Z (219 km), 2249Z (472 km) QC notes: 0450Z: AP NW of radar -----> corrected % of data reprocessed: 1/145 = 0.7% ******************************************************************************* 09 Feb 99: Light echoes streak by after 04Z, mostly outside 150 km range. Data Analyzed: 0010-2357Z Satellite Coincidence: 0026Z (610 km), 0203Z (166 km), 2001Z (662 km), 2137Z (234 km), 2314Z (622 km) QC notes: % of data reprocessed: 0/191 = 0% ******************************************************************************* 10 Feb 99: Echo free day. Data Analyzed: 0012-2353Z Satellite Coincidence: 0050Z (427 km), 0227Z (311 km), 2024Z (102 km), 2201Z (523 km), 2338Z (584 km) QC notes: None % of data reprocessed: 0/165 = 0% ******************************************************************************* 11 Feb 99: No significant precip echoes. Data analyzed: 0007-0645Z Satellite Coincidence: 0115Z (69 km), 1912Z (520 km), 2049Z (316 km), 2225Z (630 km) QC notes: 0103Z: AP N of radar -----> corrected % of data reprocessed: 1/52 = 2% ******************************************************************************* 12 Feb 99: A day free of precip related echo. Data analyzed: 1739-2355Z Satellite Coincidence: 0002Z (358 km), 0139Z (444 km), 1936Z (11 km), 2113Z (565 km), 2250Z (548 km) QC notes: 2038Z: AP NW of radar -----> corrected 2217Z: AP S of radar -----> corrected % of data reprocessed: 2/43 = 4.7% ******************************************************************************* 13 Feb 99: A day free of precip related echo. Data analyzed: 0006-2358Z Satellite Coincidence: 0026Z (38 km), 1824Z (385 km), 2000Z (390 km), 2137Z (628 km), 2314Z (281 km) QC notes: 0425Z-0818Z: AP W of radar -----> corrected 0831Z-1510Z: Intense, prolonged AP northern half of scope -----> corrected 2218Z-2241Z: Strange echo E of radar. Doesn't appear to be precip. -----> corrected 2306Z-2329Z: Same as previous period. -----> corrected % of data reprocessed: 120/229 = 52% ******************************************************************************* 14 Feb 99: A day free of precip related echo. Data analyzed: 0011-2356Z Satellite Coincidence: 0050Z (581 km), 1848Z (111 km), 2025Z (596 km), 2201Z (502 km), 2338Z (150 km) QC notes: 1317Z: AP E of radar -----> corrected 2327Z: AP N of radar -----> corrected % of data reprocessed: 2/218 = 1% ******************************************************************************* 15 Feb 99: A day free of precip related echo. Data analyzed: 0017-2356Z Satellite Coincidence: 1736Z (258 km), 1912Z (453 km), 2049Z (615 km), 2226Z (195 km) QC notes: The following VOSs contain light spurious echo specks that were easily corrected: 0017Z, 0145Z, 0412Z, 0512-0522Z, 1345Z, 1424Z, 1830Z, 1850Z % of data reprocessed: 9/145 = 6% ******************************************************************************* 16 Feb 99: Very light showers E of radar moving to the North from 0630Z to 1130Z. Other showers develop around 16Z and persist until 2130Z. Data analyzed: 0015-2350Z Satellite Coincidence: 0002Z (725 km), 1623Z (707 km), 1800Z (206 km), 1936Z (617 km), 2113Z (446 km), 2250Z (272 km) QC notes: 0630Z-1126Z: Light showers eliminated by default params -----> corrected 1433Z: Brief light shower eliminated by defaults -----> corrected 1601Z-2100Z: Light showers eliminated by default params -----> corrected 1B,2B !!FLAG!! 2105Z-2325Z: A discontinuity of some sort occurs at 2105Z, introducing areas of AP to the images, even after applying the defaults. This situation persists for the remainder of the day. This has been partially corrected, but not completely. Therefore, a flag is required. ****NOTE**** Reflectivity intensity seems to increase between 2100 & 2105Z in existing echoes....don't know why. RANGE: Not every VOS, but near 150 km when it shows up! 2A !!FLAG!! 2330Z-2335Z: Patches of intense AP remain even after modifying params RANGE: near 150 km. 2B !!FLAG!! 2340Z: Minor flagging of AP RANGE: near 150 km. 2A !!FLAG!! 2345Z-2350Z: Major flagging of AP RANGE: near 150 km. % of data reprocessed: 116/179 = 65% ******************************************************************************* 17 Feb 99: A major line of convection builds in from the west starting around 4Z, passes over the radar site around 8Z, and moves out of the area by 15Z Data analyzed: 0006-2352Z (Bad Scan at 0623Z) Satellite Coincidence: 1647Z (138 km), 1824Z (507 km), 2001Z (593 km), 2137Z (101 km) QC notes: 2A !!FLAG!! 0006Z-0031Z: The discontinuity observed beginning on the prior day (16th) continues through this period. A correction to the defaults is applied but some specks of intense AP remain, enough to warrant the application of a major flag. RANGE: specks between 120-150 km. Also potential embedded AP near 50 km to SW. 2B !!FLAG!! 0150Z-0206Z: Small but intense patch of AP E of radar Partially corrected; 0200Z remains a problem, but that speck may be a small shower. RANGE: 0206Z speck near 100 km. 2A !!FLAG!! 0236Z-0241Z: Another instance of small but intense AP RANGE: near 120 km. 2B !!FLAG!! 0513Z-0607Z: Potential light spurious echo E of radar RANGE: 125-150 km. 0623Z: Appears to be a partial file with only 4 tilts...two of the elevation angles are 1.5 degrees. Not used in 1C.HDF file. 0638Z-0733Z: Precip removed by defaults. ----> Corrected, but following VOSs have embedded clutter specks: 2A !!FLAG!! ====> 0703Z-0718Z: Clutter specks SW of radar RANGE: inside 30 km. 2A !!FLAG!! 0754Z-0809Z: Clutter specks SE of radar...also AP to NE. ----> AP mostly corrected, but not clutter specks. RANGE: Clutter w/in 25 km. 2A !!FLAG!! 1035Z-1040Z: Clutter specks SE of radar RANGE: w/in 25 km. After inspecting the second tilt images, the following periods have precip echoes aloft removed by the defaults, corrected by lowering the H3 parameter: 0051-0135Z, 0226-0316Z, 0718-1427Z: % of data reprocessed: 118/237 = 50% ******************************************************************************* 18 Feb 99: A day free of precip related echo. Data analyzed: 0003-2345Z Satellite Coincidence: 1535Z (568 km), 1711Z (289 km), 1848Z (629 km), 2025Z (383 km), 2201Z (397 km) QC notes: 0033Z-0054Z: AP NNE of radar -----> corrected 1637Z: AP NE of radar -----> corrected 2145Z: AP NW of radar -----> corrected % of data reprocessed: 4/156 = 2.6% ******************************************************************************* 19 Feb 99: A day free of precip related echo. Data analyzed: 0004-1332Z, 1503-2345Z Satellite Coincidence: 1559Z (27 km), 1735Z (551 km), 1912Z (561 km), 2049Z (0.3 km) QC notes: 0055Z: AP NNE of radar -----> corrected 0204Z-0213Z: AP W of radar -----> corrected 0233Z-0314Z: AP W-E of radar -----> corrected 0333Z-0403Z: AP W-E of radar -----> corrected 0422Z-0442Z: AP E of radar -----> corrected 0523Z-0532Z: AP E of radar -----> corrected 0552Z: AP E of radar -----> corrected 0612Z-0635Z: AP E of radar -----> corrected 0646Z: AP SE of radar -----> corrected 0724Z: AP W of radar -----> corrected 0742Z: AP W of radar -----> corrected 0829Z-0835Z: AP SE of radar -----> corrected 2046Z: AP E of radar -----> corrected % of data reprocessed: 27/158 = 17% ******************************************************************************* 20 Feb 99: After the ~8 hr data gap, a line of convection is observed moving from NW to SE across the site for the remainder of the day. Data analyzed: 0005-1412Z, 2205-2358Z (Bad scan at 2355Z) Satellite Coincidence: 1446Z (432 km), 1623Z (365 km), 1800Z (630 km), 1936Z (310 km), 2113Z (531 km) QC notes: 0034Z: AP SE of radar -----> corrected 0055Z: AP SE of radar -----> corrected 0134Z: AP NW of radar -----> corrected 0204Z-0214Z: AP W of radar -----> corrected 0243Z-0314Z: AP N-S of radar -----> corrected 0334Z: AP S of radar -----> corrected 0413Z-0813Z: AP NW of radar -----> corrected 0833Z: AP W of radar -----> corrected 0852Z-0902Z: AP NW of radar -----> corrected 0923Z: AP W of radar -----> corrected 0943Z: AP NE of radar -----> corrected 1241Z: AP ENE of radar -----> corrected 1412Z: AP NW of radar -----> corrected 2355Z: Bad scan not used in 1C.HDF file. % of data reprocessed: 40/105 = 38% ******************************************************************************* 21 Feb 99: The primary band of showers observed after 22Z on the 20th continues its southward movement, clearing the region prior to data resumption around 6Z. Data analyzed: 0005-0307Z, 0555-1317Z Satellite Coincidence: 1510Z (75 km), 1647Z (586 km), 1824Z (520 km), 2000Z (108 km) QC notes: 0005Z-0307Z: Light showers eliminated by default params -----> corrected 3B !!FLAG!! 0307Z: Radial spike infiltrates area of precip., merits minor flag RANGE: near 150 km. % of data reprocessed: 32/86 = 37% ******************************************************************************* 22 Feb 99: An echo free day. Data analyzed: 0028-1332Z, 2121-2351Z Satellite Coincidence: 1357Z (307 km), 1534Z (429 km), 1711Z (622 km), 1847Z (231 km), 2024Z (667 km) QC notes: none % of data reprocessed: 0/96 = 0% ******************************************************************************* 23 Feb 99: Bands of showers, mostly light with some more intense embedded cells move into the region after 9Z from the NW, moving to the SE and out of the region by 18Z. Data analyzed: 0020-2355Z Satellite Coincidence: 1422Z (170 km), 1558Z (610 km), 1735Z (469 km), 1912Z (224 km) QC notes: 2B !!FLAG!! 0900Z-1400Z: Small showers eliminated by defaults during this period, however attempting to restore showers introduced clutter so defaults remain as is. Not a major problem at all. 1758Z-1818Z: AP E of radar -----> corrected 1828Z: AP E of radar -----> corrected 1838Z: AP E of radar -----> corrected 1848Z-2038Z: AP E of radar -----> corrected 2053Z-2119Z: AP NE of radar -----> corrected 2129Z-2139Z: AP N of radar -----> corrected 2149Z: AP SE of radar -----> corrected 2224Z: AP NE of radar -----> corrected 2334Z: AP E of radar -----> corrected 2343Z: AP SSW of radar -----> corrected % of data reprocessed: 43/207 = 21% ******************************************************************************* 24 Feb 99: A day free of precip related echo. Data analyzed: 0007-2343Z Satellite Coincidence: 1309Z (183 km), 1446Z (488 km), 1623Z (603 km), 1759Z (138 km) QC notes: 0007Z-0119Z: AP W-E of radar -----> corrected 0145Z: AP E of radar -----> corrected 0157Z: AP E of radar -----> corrected 0210Z-0216Z: AP W-E of radar -----> corrected 0242Z-0259Z: AP SW of radar -----> corrected 0315Z-0603Z: AP W-E of radar -----> corrected 0624Z: AP E of radar -----> corrected 0653Z: AP SE of radar -----> corrected 0713Z-0812Z: AP SW of radar -----> corrected 0852Z-1508Z: AP W-E of radar -----> corrected 1528Z: AP E of radar -----> corrected 2054Z: AP NW of radar -----> corrected 2312Z-2322Z: AP NW of radar -----> corrected % of data reprocessed: 91/155 = 59% ******************************************************************************* 25 Feb 99: Very light showers enter from south after 1830Z and persist for rest of day. Data analyzed: 0002-2354Z Satellite Coincidence: 1157Z (620 km), 1333Z (258 km), 1510Z (625 km), 1647Z (408 km), 1823Z (349 km) QC notes: 0102Z-0240Z: AP N of radar -----> corrected 0301Z-0330Z: AP NW-NE of radar -----> corrected 0419Z: AP NW-NE of radar -----> corrected 0439Z-0500Z: AP NW of radar -----> corrected 0519Z-0558Z: AP NW of radar -----> corrected 0628Z: AP N of radar -----> corrected 0708Z: AP NE of radar -----> corrected 0728Z: AP NW of radar -----> corrected 0807Z: AP NW of radar -----> corrected 1255Z: AP NE of radar -----> corrected 1315Z-1324Z: AP W of radar -----> corrected 1355Z: AP NE-W of radar -----> corrected 1415Z-1425Z: AP NW-W of radar -----> corrected 1713Z: AP NE of radar -----> corrected 2A,2B !!FLAG!! 1823Z-2354Z: Light showers eliminated by defaults, some restored by altering params A few clutter specks show up at 1833Z and 1848-1903Z. RANGE: Clutter generally w/in 30 km. % of data reprocessed: 101/177 = 57% ******************************************************************************* 26 Feb 99: Light shower activity south of radar until ~4Z with a lull until ~11Z when more light activity redevelops, becoming more widespread and intense across the northern sector, diminishing by the end of the period. Data analyzed: 0010-2356Z Satellite Coincidence: 1221Z (70 km), 1357Z (535 km), 1534Z (575 km), 1711Z (41 km) QC notes: 2B,3B !!FLAG!! 0010Z-0230Z: Tried to lower params to reinstate showers, effort failed thus the minor flag 1101Z-1956Z: Light showers eliminated by defaults -----> corrected 2230Z-2356Z: Precip removed in second tilt. % of data reprocessed: 116/249 = 47% ******************************************************************************* 27 Feb 99: Very light shower activity traverses region from SW to NE from 0Z to 15Z. More intense convective lines move into scope from NW after 15Z and move off to the east through the remainder of the day. Data analyzed: 0004-2349Z (Bad scan at 0004Z) Satellite Coincidence: 1108Z (483 km), 1245Z (337 km), 1422Z (631 km), 1558Z (338 km), 1735Z (480 km) QC notes: 0006Z-1159Z: Precip removed in second tilt. 2B !!FLAG!! 0953Z: Light radial spike remnant to S. RANGE: near 100 km. 1A, 1B !!FLAG!! 1736Z-1741Z: Clutter speck to NW. RANGE: near 50 km. % of data reprocessed: 145/285 = 51% ******************************************************************************* 28 Feb 99: Lines of convection sweep across region between 0Z and 5Z exiting through the SE. Region is precip free thereafter. Data analyzed: 0006-2345Z (Bad scan at 0006Z) Satellite Coincidence: 1132Z (39 km), 1309Z (574 km), 1446Z (536 km), 1622Z (68 km) QC notes: 0105Z-0115Z: AP to SW, embedded in precip. 2A !!FLAG!! -----> Difficult to remove since most of it is embedded. RANGE: Embedded AP between 60-100 km. 0137Z-0217Z: Same as previous period, only AP to E and non-embedded AP to W. 2A, 2B !!FLAG!! -----> Non-embedded AP is corrected. Embedded AP is not. RANGE: Embedded AP 40-75 km. 0313Z-0328Z: AP W of radar -----> corrected 0333Z-0508Z: Large, intense splotches of AP W-E of radar 2A !!FLAG!! -----> Vast improvements made. Period still flagged, though, due to either (1) small, intense AP specks that could not be removed, or (2) missing areas of light to moderate precip in the SE. The AP was so intense and widespread, though, that removing it seemed a higher priority than keeping all of the light to moderate precip in the SE (especially when considering the rainmap that will be produced from this data). RANGE: AP specks/splotches scattered from 75-150 km. 0513Z-0644Z: AP remains in absence of precip w/in 150 km. -----> corrected 0654Z-0659Z: AP E of radar -----> corrected 0709Z: AP E of radar -----> corrected 0719Z: AP E of radar -----> corrected 0744Z: AP E of radar -----> corrected 0809Z: AP SW of radar -----> corrected 0820Z: AP E of radar -----> corrected 0841Z-0901Z: AP W-E of radar -----> corrected 0921Z-0931Z: AP W of radar -----> corrected 0950Z: AP SW of radar -----> corrected 1010Z: AP SW of radar -----> corrected 1039Z: AP E of radar -----> corrected 1110Z: AP SW of radar -----> corrected 1140Z: AP SW of radar -----> corrected 1229Z: AP W of radar -----> corrected 1329Z-1339Z: AP SW of radar -----> corrected 1418Z-1428Z: AP W-E of radar -----> corrected 1956Z-2006Z: AP E of radar -----> corrected % of data reprocessed: 86/192 = 45% *******************************************************************************