Site log - Kwaj (Dec 1997) Flags: 1-Satellite coincidence data 2-Scan in TSDIS data 3-Scan not in TSDIS data A-Major problem (moderate to strong AP &/or widespread coverage) B-Minor problem (weak AP &/or very litte coverage) ********************************************************************************************* 01 Dec 97: Scattered showers throughout the day. Data processed: 0000-2355 Z QC notes: 0148-0218Z: second-trip echo remaining E of radar -----> corrected 0623Z: radial-spike remnant WSW of radar -----> corrected 1107-2355Z: second-trip echo remaining SE to S of radar -----> corrected ********************************************************************************************* 02 Dec 97: Very little precipitation in the form of widely scattered showers. Data processed: 0004-2355 Z QC notes: 0004-0222Z: second-trip echo remaining S of radar -----> corrected ********************************************************************************************* 03 Dec 97: Scattered showers and convection throughout the day, with more rain present after 12Z. Data processed: 0005-1959 Z 2136-2358 Z QC notes: 1217-1500Z: second-trip echo remaining SE of radar -----> corrected ********************************************************************************************* 04 Dec 97: Scattered showers and convection throughout the day. Data processed: 0008-2359 Z QC notes: 0623Z: radial spike remnants SW of radar -----> corrected 0642-0819Z: second-trip echo remaining N of radar -----> corrected 0945-1336Z: second-trip echo remaining NW, N, and E of radar -----> corrected 1405-1425Z: second-trip echo remaining NW of radar 2B !!FLAG!! -----> some of the weak seocnd-trip was removed but some remains as well in the form of a 10 dB reflectivity splotch. Could not remove further false echo without removing precip. 1718-1826Z: second-trip echo remaining NW of radar 2B !!FLAG!! -----> most of second-trip removed but most VOS's still contain very weak splotches of second-trip, especially adjacent to precip. Could not further remove false echo without removing precip. 1855Z: radial spike remnants SE of radar -----> corrected ********************************************************************************************* 05 Dec 97: Widely scattered showers and convection. Data processed: 0009-2350 Z QC notes: 1856Z: radial spike remnants SE of radar -----> corrected ********************************************************************************************* 06 Dec 97: Scattered showers and convection throughout the day. Data processed: 0000-2359 Z QC notes: 0227-0237Z: second-trip echo remaining E of radar -----> corrected 0335Z: radial spike remnants N of radar -----> corrected ********************************************************************************************* 07 Dec 97: Scattered showers early quickly gives way to a large precipitation shield of moderate intensity with lots of convection which remains within the radar's scope for most of the day. Data processed: 0009-2354 Z QC notes: 0009-0704Z: second-trip echo remaining SW of radar -----> corrected 0704-0831Z: decrease in reflectivity as precip moves into immediate vicinity of the radar (~0-20 km from radar) nothing can be done on our end. 1A !!FLAG!! -----> unfortunately, TRMM overpass occurred at 0738Z at a distance of 26 km! 0723-0900Z: second-trip echo remaining NW and SW of radar -----> corrected 2A !!FLAG!! 0929-1017Z: possible decrease in reflectivity as precip moves into immediate vicinity of the radar (~0-20 km from radar) nothing can be done on our end. 1017-1046Z: second-trip echo remaining NW of radar -----> corrected 1340-1437Z: second-trip echo remaining SE of radar -----> corrected 2A !!FLAG!! 1457-1614Z: decrease in reflectivity as precip moves into immediate vicinity of the radar (~0-20 km from radar) nothing can be done on our end. 1624-1653Z: second-trip echo remaining SW of radar 3B !!FLAG!! -----> Much improved but VOS's 1633 and 1643 still have a splotch of week second-trip echo remaining. I feel bad even flagging this since the false echo is so small and weak but I did anyways. 1917-2149Z: second-trip echo remaining NW of radar -----> corrected ******************************************************************************************** 08 Dec 97: Scattered showers throughout the day, as well as some larger, more organized convective clusters. Data processed: 0004-2355 Z QC notes: 0326Z: second-trip echo remaining E of radar -----> corrected 0629Z: radial spike remaining to the SW -----> corrected 1608-1852Z: second trip echo remaining N of radar -----> corrected...a few stray light showers may have been eliminated, but nothing major. 2150-2355Z: second trip echo remaining N of radar -----> corrected ******************************************************************************************** 09 Dec 97: Scattered showers intermingled with numerous organized squall lines and convective clusters throughout the day. Data processed: 0004-2351 Z QC notes: 0221Z: second-trip echo remaining E of radar -----> corrected 0455-0534Z: decrease in reflectivity as precip moves into immediate vicinity of the radar (~0-20 km from radar) 2A !!FLAG!! -----> nothing can be done on our end. 0603-0612Z: second-trip echo remaining -----> corrected 0632Z: second-trip echo remaining -----> corrected 0827-2351Z: lots of second-trip echo remaining in various locations w/in radar scope...mostly light, isolated specks and splotches -----> corrected...may be some light false echo specks in a few VOSs, but very minor. Near the end of the period, some second trip may be included around some of the cells that move through the well-defined region of second-trip to the SSE, but it's very difficult to shave this spurious echo away. Lastly, some small, light cells may be eliminated. Overall, though, this whole period looks fairly decent when compared to DZ. ******************************************************************************************** 10 Dec 97: Numerous squall line and large convective clusters. Bands of precip associated with TS Paka move in after ~1700 Z. Data processed: 0000-2358 Z Satellite coincidence: 0539Z, 1700Z QC notes: 0000-0020Z: second-trip echo remaining to the SSW. -----> corrected 0029-0137Z: second-trip echo to SSW 'til 0108Z...also reduction in reflectivity intensity as heavier precip moves over radar 2A !!FLAG!! -----> nothing can be done on our end for the reduction in dBZ. Second-trip problem mostly solved. 0509-0617Z: second-trip echo remaining to E and SE -----> corrected 0626Z: radial spike to WSW 3A !!FLAG!! -----> some light remnants remain, but mainly near 150 km and greater. 0901-2358Z: second-trip echo remaining mostly in the southern half of the domain. 1B and 2B !!FLAG!! -----> much of the worst second-trip is removed in this time period, but some still remains. It's mostly light, thus the minor flag. It mostly occurs when a small cell moves through a region of second-trip, and some 'residual' spurious echo is kept around the cell. Some random spikes are also evident in a few VOSs, ******************************************************************************************** 11 Dec 97: Paka continues to bring plentiful moderate to heavy precip for the whole day. The eye first appears in the SSE after 0930Z, then moves NW throughout the day mostly between 150 and 200 km from the radar. Data processed: 0008-2352 Z Satellite coincidence: 0603Z, 1547Z (only 50 km away!) QC notes: Reduction in dBZ close to the radar occurs for much of the day, esp. between the following times: 2A !!FLAG!! 0439-0537Z 2A !!FLAG!! 0733-0939Z 1A and 2A !!FLAG!! 1106-2352Z Other qc problems: 0008-0654Z: Some second-trip echoes remaining, but very difficult to distinguish when precip moves close to the spurious echo. -----> corrected. This is a borderline period. Some second trip may remain, but it's masked by legitimate precip. Most of the echoes in this period, though, have temporal and vertical continuity and Doppler velocities support their existence. The second-trip, if any, is under 10-15 dBZ, so a few specks of it here or there shouldn't be too much of a problem. ******************************************************************************************** 12 Dec 97: Moderate to heavy bands and clusters of precip from Paka for most of the day. The eye moves out of sight 0500Z. Very good precip data, though, except for the reduction in reflectivity surrounding the radar. Data processed: 0001-2359Z Satellite coincidence: 0450Z, 1435Z QC notes: Reduction in dBZ close to the radar occurs for much of the day, esp. between the following times: 2A !!FLAG!! 0001-0325Z 1A and 2A !!FLAG!! 0414-1131Z 2A !!FLAG!! 1739-2004Z Other qc problems: 0227-1659Z: Some second-trip echoes remaining, but very difficult to distinguish when precip moves close to the spurious echo. -----> corrected. Another borderline period. Some second trip may remain, but it's masked by legitimate precip or is very light, so a few specks of it here or there shouldn't present too much of a problem. ******************************************************************************************** 13 Dec 97: Widespread moderate to heavy precip through ~0400Z, then dissipates a bit. Band of moderate to intense precip lingers to the SSW from ~1100-2353Z. Data processed: 0009-2353Z Satellite coincidence: 0514Z, 1459Z QC notes: Reduction in dBZ close to the radar occurs for much of the day, esp. between the following times: 2A !!FLAG!! 0009-0057Z Other qc problems: 0009-2353Z: Some second-trip echoes remaining most of the day. -----> corrected. Another borderline period. Some second trip may remain, but it's masked by legitimate precip or is very light, so a few specks of it here or there shouldn't present too much of a problem (same as past two days!). ******************************************************************************************** 14 Dec 97: Band of convection, weakening to showers, moves over the radar early on. After that, no real significant preciptation Data processed: 0003-2351 Z Satellite Coincidence: 0402Z, 1346Z QC notes: 0817-1140Z: second-trip echo remaining -----> corrected 0934Z: radial spike remnants remaining -----> corrected....any spike remnants remaining is beyond 150 km. 1022Z: radial spike remnants remaining -----> corrected....any spike remnants remaining is beyond 150 km. 1257Z: second-trip echo remaining -----> corrected 1415-1434Z: second-trip echo remaining -----> corrected 1503-1640Z: second-trip echo remaining -----> corrected ********************************************************************************************** 15 Dec 97: Very widely scattered, weak showers early in the day increase significantly in coverage but the showers are still weak. Data processed: 0001-2353 Z Satellite Coincidence: 1410Z QC notes: 0626Z: radial spike remnants remaining SW of radar -----> corrected 1858Z: radial spike remnants remaining SE of radar -----> corrected ********************************************************************************************** 16 Dec 97: Scattered showers but with more moderate precip than the previous day. Data processed: 0002-2359 Z Satellite Coincidence: none QC notes: 0627Z: radial spike remnants remaining SW of radar -----> corrected 2A !!FLAG!! 0823-1038Z: ring of decreased reflectivity surrounding radar where moderate showers are reduced to very weak showers. Nothing can be done on our end to correct this. 2A !!FLAG!! 1145-1458Z: ring of decreased reflectivity surrounding radar where moderate showers are reduced to very weak showers. Nothing can be done on our end to correct this. 1508-1557Z: second-trip echo remaining SW of radar -----> corrected 1644-2007Z: second-trip echo remaining SW of radar 2B !!flag!! -----> some very light second-trip remaining in a few of the VOSs but it is very minor and barely gets a flag. 2105-2359Z: second-trip echo remaining SW to S of radar 2B !!FLAG!! -----> most VOS's are completely cleaned up but their are a few which still contain some weak second-trip in the 120-150 km range. All second-trip could not be removed due to the presence of weak showers. ************************************************************************************************ 17 Dec 97: Widely scattered weak showers throughout the day. Data processed: 0000-2355 Z Satellite Coincidence: 0200Z, 1321Z QC notes: 0000-0918Z: second-trip echo remaining S of radar 2B !!FLAG!! -----> some VOS's, especially around 05Z, still contain some second-trip echo which could not be removed. The second- trip is very light though. 1926-1935Z: second-trip echo remaining S of radar -----> corrected ************************************************************************************************ 18 Dec 97: Widely scattered showers throughout the day. Data processed: 0005-2351 Z Satellite Coincidence: 0224Z, 1208Z QC notes: 0627Z: radial spike remnants remaining SW of radar -----> corrected 1901Z: radial spike remnants remaining SE of radar -----> corrected ************************************************************************************************ 19 Dec 97: Scattered showers with a convective cluster to the NW for most of second half of the day. Data processed: 0001-2357 Z Satellite Coincidence: 1056Z QC notes: 0131-0150Z: dimming of reflectivities 3A !!FLAG!! -----> reduction of reflectivities most likely due to solar calibrations 0629Z: radial spike remnants SW of radar -----> corrected ************************************************************************************************ 20 Dec 97: Widely scattered showers throughout the day Data processed: 0006-2027 Z 2201-2359 Z Satellite Coincidence: 0135Z, 1120Z QC notes: 1901Z: radial spike remnants SE of radar -----> corrected *********************************************************************************************** 21 Dec 97: Extremely widely scattered showers (which are ver weak) throughout the day. Data processed: 0008-2359 Z Satellite Coincidence: 0023Z, 1007Z QC notes: 0633Z: radial spike remnants SW of radar -----> corrected 1902Z: radial spike remnants SE of radar -----> corrected *********************************************************************************************** 22 Dec 97: Scattered light showers and storms throughout day surrounding radar. Data processed: 0009-2359Z Satellite Coincidence: 0047Z, 1032Z, 2335Z QC notes: 0633Z: radial spike remnant SW of radar -----> corrected within 150 km range 1902Z: radial spike remnant SE of radar -----> corrected within 150 km range 2213Z: radial spike NNW of radar beyond 150 km range. *********************************************************************************************** 23 Dec 97: Scattered showers and small storms throughout day. Several thin lines of showers and storms develop and pass mainly N of radar. Data processed: 0008-2350Z Satellite Coincendence: 0919Z, 2222Z QC notes: 3B !!FLAG!! 0634Z: Radial spike remnant SW of radar with light precip. Could not be corrected due to presence of precip. Spike is mainly, but not entirely beyond 150 km range. 2A !!FLAG!! 1509Z: Reflectivities diminish as line of showers moves directly over radar - NO FIX AVAILABLE. 3A !!FLAG!! 1519Z: Reflectivities diminish as line of showers moves directly over radar - NO FIX AVAILABLE. 3A !!FLAG!! 1528Z: Reflectivities diminish as line of showers moves directly over radar - NO FIX AVAILABLE. 2A !!FLAG!! 1538Z: Reflectivities diminish as line of showers moves directly over radar - NO FIX AVAILABLE. 3B !!FLAG!! 1901Z: Radial spike remnant SE of radar with light precip. Could not be corrected due to presence of precip. Spike is mainly, but not entirely beyond 150 km range. 2046-2105Z: overall diminishing of reflectivities probably due to radar calibration. ************************************************************************************************ 24 Dec 97: Light scattered showers surrounding radar throughout entire day. Lines of showers with small convective cells more numerous 1110Z --> 2219Z mainly N of radar. Data processed: 0000-2356Z Satellite Coincidence: 0943Z, 2246Z QC notes: 0638Z: radial spike remnant SW of radar with precip. Spike is mainly, but not entirely beyond 150 km range. ----> corrected 3A !!FLAG!! 1748Z: weakening of reflectivities when line of showers moves directly over radar. No fix for this problem. 3B !!FLAG!! 1906Z: radial spike SE of radar with light precip. Could not be corrected due to the presence of weak precip. Spike is mainly, but not entirely beyond 150 km range. ************************************************************************************************** 25 Dec 97: Light scattered showers and small convective cells surrounding radar throughout entire day. No organized significant precip. Data processed: 0006-2354Z Satellite Coincidence: 0831Z, 2134Z QC notes: 2B !!FLAG!! 0633Z: radial spike SW of radar - could not be corrected. Majority of spike beyond 150 km - some light showers removed by QC 2B !!FLAG!! 1905Z: radial spike remnants SE of radar - could not be corrected. Majority of spike beyond 150 km. 2032-2100Z: radial spike remnants NW of radar -----> corrected. ************************************************************************************************ 26 Dec 97: Light scattered showers and small convective cells surrounding radar throughout day. Showers more numerous between 1400Z and 2000Z. Data processed: 0003-2356Z Satellite Coincidence: 0719Z, 2158Z QC notes: 0630Z: radial spike remnant SW of radar beyond 150 km range. 0639Z: radial spike remnant SW of radar (no precip) ----> corrected 1902Z: radial spike SE of radar with embedded precip. ----> corrected ************************************************************************************************* 27 Dec 97: Light showers surrounding radar from 0640Z --> 1246Z and from 2046Z --> 2333Z. Precipitation was not significant. Data processed: 0006-1246Z 2046-2352Z Satellite Coincidence: 0742Z, 2045Z QC notes: 0221-0240Z: radial spike remnants remaining ----> corrected 0259-0309Z: second trip echoes NW of radar ----> corrected 0319Z: second trip echo NW of radar - could not correct 3B !!FLAG!! -----> minor coverage and <= 10 dBZ 0328-0435Z: second trip echoes ----> corrected ********************************************************************************************** 28 Dec 97 Light scattered shower activity 0511Z --> 2356Z surrounding radar. Line of showers passes S of radar 1741Z. Data processed: 0002Z-2356Z Satellite coincidence: 0630, 0934 QC notes: Dimming of reflectivities 2024Z --> 2043Z 0637Z Radial spike remnants SW of radar beyond 150 km range. 1908Z Radial spike SE of radar 3B !!FLAG!! -----> could not be corrected - moved to bad_files directory therefore not included in TSDIS data. *********************************************************************************************** 29 Dec 97 Light showers and weak convection develop N & W of radar 1001Z --> 1245Z Larger, more organized showers and convection oriented SW - NE approaching radar from East. 2027Z --> 2319Z 4 shallow lines of showers and weak convection develop and pass over radar from E to W. Data processed: 0005-2358Z Satellite coincidence: 0654Z, 1956Z QC notes: 0639Z: radial spike remnants remaining but most appears to be beyond 150 km and any false echo which does venture inside this range is very weak (<= 10 dB) so it is left alone (so as not to adversely affect precip) and not flagged. *********************************************************************************************** 30 Dec 97 Light showers W of radar from 0008Z --> 0232Z. Scattered light showers surrounding radar from 0720Z --> 2318Z. Data processed: 0008-2356Z Satellite coincidence : 0541Z, 1844Z QC notes: 0641Z radial spike remnants SW of radar -----> corrected *********************************************************************************************** 31 Dec 97 Scattered light showers / small convective storms surrounding radar from 09Z --> 18Z. Data Processed: 0006-1900Z 2114-2358Z Satellite Coincidence: 0605Z, 1907Z QC notes: 0640Z radial spike remnant SW of radar -- mainly, but not entirely beyond 150 km range. ---> corrected within 150 km range. **********************************************************************************************