DQR ID: D020110.1 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 01-10-2002 DQR SUBJECT: SGP/SONDE/C1 - Bad temperature in SGP/CF sounding 20020108:0528 SUGGESTIONS: QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: Temperature values in this sounding went from 3.5 degC at the surface to -33.3 degC at the next sample. It appears that all the remaining temperature values have an approximate -35 degC offset. The pressure and RH values appear reasonable. ---------------------------------------- DQR DATASTREAM(S): sgpsondewnpnC1.a1 dp tdry sgpsondewnpnC1.b1 dp tdry START DATE/TIME: 01/08/2002 05:28 GMT END DATE/TIME:01/08/2002 07:14 GMT ---------------------------------------- LINK(S): none
DQR ID: D020524.27 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 05-24-2002 DQR SUBJECT: SGP/SONDE/C1 - CF sounding 20020522:1130 bad temperature/RH SUGGESTIONS: There is no fix. Ignore the thermodynamic data. The winds should be fine as a function of pressure, but the height will be inaccurate because the pressure is being integrated with incorrect ambient temperature as opposed to virtual temperature. QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: It appears that the sonde sensor boom was damaged upon launch. The result is that no RH data are reported and the reported temperature is something on the order of 60 degC too low. ---------------------------------------- DQR DATASTREAM(S): sgpsondewnpnC1.a1 alt asc dp rh tdry sgpsondewnpnC1.b1 alt asc dp rh tdry START DATE/TIME: 05/22/2002 11:30 GMT END DATE/TIME:05/22/2002 13:47 GMT ---------------------------------------- LINK(S): none
DQR ID: D020526.1 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 05-26-2002 DQR SUBJECT: SGP/SONDE/C1 - Bad T/RH data in CF sounding 20020523:1129 SUGGESTIONS: No fix for tdry, rh, td, alt (inaccurate because of bad tdry and rh), and asc (derived from alt). Pressure and winds should be fine. QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: It appears that the sensor boom was damaged shortly after launch. The temperature reading jumps -60 degC and the RH goes to 0. ---------------------------------------- DQR DATASTREAM(S): sgpsondewnpnC1.a1 alt asc dp rh tdry sgpsondewnpnC1.b1 alt asc dp rh tdry START DATE/TIME: 05/23/2002 11:29 GMT END DATE/TIME:05/23/2002 13:22 GMT ---------------------------------------- LINK(S): none
DQR ID: D020611.2 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 06-11-2002 DQR SUBJECT: SGP/SONDE/C1 - CF sounding 20020609:0229 bad temp/rh/etc SUGGESTIONS: None. QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: The temperature and RH for this sounding look bad, either because of interference from another sonde or because the temperature sensor was broken on launch. The sounding terminated early in any event. ---------------------------------------- DQR DATASTREAM(S): sgpsondewnpnC1.a1 alt asc dp rh tdry sgpsondewnpnC1.b1 alt asc dp rh tdry START DATE/TIME: 06/09/2002 02:29 GMT END DATE/TIME:06/09/2002 02:36 GMT ---------------------------------------- LINK(S): none
DQR ID: D020626.34 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 06-26-2002 DQR SUBJECT: SGP/SONDE/C1 - Incorrect Surface Pressure SUGGESTIONS: QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: It appears that the operator made a typographical error when entering the surface pressure. The file has 987.0 hPa and it probably should be 978.0 which would be consistent with the first sample provided by the radiosonde (977.3 hPa), the surface pressures recorded for the adjacent soundings, and the THWAPS pressure. Because the sounding altitude is calculated assuming the surface pressure is correct, the altitude values for the entire flight and the ascent rate values for the first 30 seconds of the sounding will be incorrect. ---------------------------------------- DQR DATASTREAM(S): sgpsondewnpnC1.a1 alt asc sgpsondewnpnC1.b1 alt asc START DATE/TIME: 06/17/2002 11:28 GMT END DATE/TIME:06/17/2002 13:13 GMT ---------------------------------------- LINK(S): none
DQR ID: D020626.35 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 06-26-2002 DQR SUBJECT: SGP/SONDE/C1 - Bad Temperature Sensor SUGGESTIONS: QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: It appears that the temperature sensor broke shortly after launch. As a result, the temperature and dewpoint values are incorrect. ---------------------------------------- DQR DATASTREAM(S): sgpsondewnpnC1.a1 dp rh tdry sgpsondewnpnC1.b1 dp rh tdry START DATE/TIME: 06/19/2002 23:29 GMT END DATE/TIME:06/20/2002 00:36 GMT ---------------------------------------- LINK(S): none
DQR ID: D020703.1 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 07-03-2002 DQR SUBJECT: SGP/SONDE/C1 - Bad temperature SGP/CF sounding 20020627:1728 SUGGESTIONS: No suggestions. QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: Temperature sensor broke at launch. All temperature-related variables are incorrect. ---------------------------------------- DQR DATASTREAM(S): sgpqmemwrcolC1.c1 integ_vap_sonde integ_vap_sonde_direct sgpqmemwrprofC1.c1 sonde_vap sgpsondewnpnC1.a1 dp rh tdry sgpsondewnpnC1.b1 dp rh tdry START DATE/TIME: 06/27/2002 17:28 GMT END DATE/TIME:06/27/2002 19:08 GMT ---------------------------------------- LINK(S): none
DQR ID: D990124.2 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 07-08-2002 DQR SUBJECT: SGP/SONDE - Dry bias in sonde RH SUGGESTIONS: When the final algorithm is available, ARM sounding data should be reprocessed to obtain corrected RH data. A new data stream will be required. QUALITY COLOR: Yellow - Suspect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: Vaisala has confirmed ARM findings of an apparent dry bias in the relative humidity measured by RS-80H radiosondes. The cause of the dry bias is thought to be contamination of the humidity sensor by volatile organic substances originating from some plastic parts of the radiosonde. The amount of contamination is a function of the time between the date of sonde manufacture and its use. All RS-80H sondes manufactured before week 34 of 1998 will show this bias. After week 34 of 1998 Vaisala changed its packaging to reduce, but not eliminate the contamination problem. Starting with RS-80 radiosonde manufactured in late June 2000 Vaisala enclosed the sensor boom in an inert plastic shield, thereby eliminating the contamination that caused the dry bias. Starting in May 2001 at the SGP, May 2002 at the TWP, and later 2002 at the NSA, ARM has moved to using RS-90 radiosondes. These sondes are not subject to the contaminatino that caused the dry bias. Vaisala is in the process of developing an algorithm that can be used to estimate the correct RH from knowledge of the sonde age. All of the ARM sounding data have sufficient metadata available to apply the correction. Additionally, ARM has funded a Science Team effort (Milosevich) to develop a 'best' correction algorithm for the RS-80 radiosonde humidity data. When completed this algorithm will allow us to reprocess the accumulated RS-80 data and produce a new data platform with what we hope will be more accurate data. ---------------------------------------- DQR DATASTREAM(S): DsgpsondeB1.00 Development raw data stream - documentation not supported DsgpsondeB1.a0 Development data stream - documentation not supported DsgpsondeB1.a1 Development data stream - documentation not supported DsgpsondeB4.00 Development raw data stream - documentation not supported DsgpsondeB4.a0 Development data stream - documentation not supported DsgpsondeB4.a1 Development data stream - documentation not supported DsgpsondeB5.00 Development raw data stream - documentation not supported DsgpsondeB5.a0 Development data stream - documentation not supported DsgpsondeB5.a1 Development data stream - documentation not supported DsgpsondeC1.00 Development raw data stream - documentation not supported DsgpsondeC1.a0 Development data stream - documentation not supported DsgpsondeC1.a1 Development data stream - documentation not supported DsgpsondenogcptucalcB1.c1 Development data stream - documentation not supported DsgpsondenogcptucalcB4.c1 Development data stream - documentation not supported DsgpsondenogcptucalcB5.c1 Development data stream - documentation not supported DsgpsondenogcptucalcC1.c1 Development data stream - documentation not supported DsgpsondenogcwrpnB1.c1 Development data stream - documentation not supported DsgpsondenogcwrpnB4.c1 Development data stream - documentation not supported DsgpsondenogcwrpnB5.c1 Development data stream - documentation not supported DsgpsondenogcwrpnC1.c1 Development data stream - documentation not supported DsgpsondeptuB1.00 Development raw data stream - documentation not supported DsgpsondeptuB4.00 Development raw data stream - documentation not supported DsgpsondeptuB5.00 Development raw data stream - documentation not supported DsgpsondeptuB6.00 Development raw data stream - documentation not supported DsgpsondeptuC1.00 Development raw data stream - documentation not supported DsgpsondeptucalcB1.c1 Development data stream - documentation not supported DsgpsondeptucalcB4.c1 Development data stream - documentation not supported DsgpsondeptucalcB5.c1 Development data stream - documentation not supported DsgpsondeptucalcC1.c1 Development data stream - documentation not supported sgpsondeB1.00 Raw data stream - documentation not supported sgpsondeB1.a0 dp rh sgpsondeB1.a1 dp rh sgpsondeB4.00 Raw data stream - documentation not supported sgpsondeB4.a0 dp rh sgpsondeB4.a1 dp rh sgpsondeB5.00 Raw data stream - documentation not supported sgpsondeB5.a0 dp rh sgpsondeB5.a1 dp rh sgpsondeB6.00 Raw data stream - documentation not supported sgpsondeC1.00 Raw data stream - documentation not supported sgpsondeC1.a0 dp rh sgpsondeC1.a1 dp rh sgpsondeptuC1.00 Raw data stream - documentation not supported sgpsondewnpnB1.a0 dp rh sgpsondewnpnB1.a1 dp rh sgpsondewnpnB4.a0 dp rh sgpsondewnpnB4.a1 dp rh sgpsondewnpnB5.a0 dp rh sgpsondewnpnB5.a1 dp rh sgpsondewnpnB6.a0 dp rh sgpsondewnpnB6.a1 dp rh sgpsondewnpnC1.a0 dp rh sgpsondewnpnC1.a1 dp rh sgpsondewnprC1.a0 dp rh sgpsondewnprC1.a1 dp rh sgpsondewrpnB1.00 Raw data stream - documentation not supported sgpsondewrpnB1.a0 dp rh sgpsondewrpnB1.a1 dp rh sgpsondewrpnB4.00 Raw data stream - documentation not supported sgpsondewrpnB4.a0 dp rh sgpsondewrpnB4.a1 dp rh sgpsondewrpnB5.00 Raw data stream - documentation not supported sgpsondewrpnB5.a0 dp rh sgpsondewrpnB5.a1 dp rh sgpsondewrpnB6.00 Raw data stream - documentation not supported sgpsondewrpnB6.a0 dp rh sgpsondewrpnB6.a1 dp rh sgpsondewrpnC1.00 Raw data stream - documentation not supported sgpsondewrpnC1.a0 dp rh sgpsondewrpnC1.a1 dp rh sgpsondewrprB1.00 Raw data stream - documentation not supported sgpsondewrprB1.a0 dp rh sgpsondewrprB1.a1 dp rh sgpsondewrprB4.00 Raw data stream - documentation not supported sgpsondewrprB4.a0 dp rh sgpsondewrprB4.a1 dp rh sgpsondewrprB5.00 Raw data stream - documentation not supported sgpsondewrprB5.a0 dp rh sgpsondewrprB5.a1 dp rh sgpsondewrprC1.00 Raw data stream - documentation not supported sgpsondewrprC1.a0 dp rh sgpsondewrprC1.a1 dp rh START DATE/TIME: 05/27/1992 00:00 GMT END DATE/TIME:05/31/2002 23:59 GMT ---------------------------------------- LINK(S): PIF ID: P990129.5 - SGP/SONDE - Dry bias in sonde RH (many facilities)
DQR ID: D020909.1 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 09-09-2002 DQR SUBJECT: SGP/SONDE/C1 - Bad Temperature Sensor SUGGESTIONS: No fix. QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: It appears that the temperature sensor broke upon launch and therefore the reported temperature is approximately 40 degC too low. ---------------------------------------- DQR DATASTREAM(S): sgplssondeC1.c1 rh tdry sgpqmemwrcolC1.c1 integ_vap_sonde sgpsondewnpnC1.a1 dp rh tdry sgpsondewnpnC1.b1 dp rh tdry START DATE/TIME: 09/06/2002 17:27 GMT END DATE/TIME:09/06/2002 18:54 GMT ---------------------------------------- LINK(S): none
DQR ID: D020909.2 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 09-09-2002 DQR SUBJECT: SGP/SONDE/C1 - Bad Temperature Sensor SUGGESTIONS: No fix. QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: It appears that the temperature sensor broke shortly after launch. Temperatures are offset by approxmiately (but not constantly) 40 degC. ---------------------------------------- DQR DATASTREAM(S): sgplssondeC1.c1 rh tdry sgpqmemwrcolC1.c1 integ_vap_sonde sgpsondewnpnC1.a1 dp rh tdry sgpsondewnpnC1.b1 dp rh tdry START DATE/TIME: 09/06/2002 05:27 GMT END DATE/TIME:09/06/2002 07:18 GMT ---------------------------------------- LINK(S): none
DQR ID: D021006.1 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 10-06-2002 DQR SUBJECT: Bad temperature sensor SUGGESTIONS: QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: It appears that the temperture sensor broke a few seconds into flight. This results in an unreasonably low temperature for the rest of the flight. For some reason, the rh values also go missing shortly after launch. Only the wind and pressure data are reliable. ---------------------------------------- DQR DATASTREAM(S): sgplssondeC1.c1 alt rh tdry sgpsondewnpnC1.a1 alt asc dp rh tdry sgpsondewnpnC1.b1 alt asc dp rh tdry START DATE/TIME: 10/03/2002 11:20 GMT END DATE/TIME:10/03/2002 13:20 GMT ---------------------------------------- LINK(S): none
DQR ID: D021110.2 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 11-10-2002 DQR SUBJECT: SGP/SONDE/B4 - Soundings contaminated by interference SUGGESTIONS: Not much to be done about the data. I will send an e-mail to SiteOps alerting them to the problem. I note that the more recent soundings that I have from B4 (11/08/2002, 0829,1156,1429,1729) look OK, though the fact that the 0230 and 0530 soundings are missing and the 1156 sounding was done almost a half hour late suggests a continuing problem. QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: These five soundings, done in succession on 11/07/2002 as part of the SCM/IOP are contaminated by interference. I can't tell whether the problem has to do with improper tuning of the radiosondes, inadequate frequency separation among radiosondes launched from different locations, or some other operator problem. I suspect that there is an operator component to the difficulty because the surface pressure is given as an unreasonably low 896.6 hPa on the 1730 sounding and 886.1 hPa on the 2331 sounding. This may indicate that the ground station was locked another station's radiosonde rather than on the B4 radiosonde. ---------------------------------------- DQR DATASTREAM(S): sgplssondeB4.c1 alt lat lon pres rh tdry sgpqmemwrcolB4.c1 integ_vap_sonde max_height_sonde model_tbsky23 model_tbsky31 model_tmr23 model_tmr31 sgpsondewnpnB4.a1 alt asc deg dp lat lon pres rh tdry u_wind v_wind wspd sgpsondewnpnB4.b1 alt asc deg dp lat lon pres rh tdry u_wind v_wind wspd START DATE/TIME: 11/07/2002 11:30 GMT END DATE/TIME:11/07/2002 13:16 GMT START DATE/TIME: 11/07/2002 14:29 GMT END DATE/TIME:11/07/2002 16:29 GMT START DATE/TIME: 11/07/2002 17:30 GMT END DATE/TIME:11/07/2002 19:30 GMT START DATE/TIME: 11/07/2002 20:29 GMT END DATE/TIME:11/07/2002 22:39 GMT START DATE/TIME: 11/07/2002 23:31 GMT END DATE/TIME:11/08/2002 01:31 GMT ---------------------------------------- LINK(S): none
DQR ID: D021112.2 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 11-12-2002 DQR SUBJECT: SGP/SONDE/B4 - Possible interference in B4 sounding 20021110.1729 SUGGESTIONS: Caveat emptor. QUALITY COLOR: Yellow - Suspect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: There is a strange inversion aloft in the subject sounding. The temperature goes from -56.3 degC to -51.5 degC in less than two minutes (approximately .72 km). This is somewhat below the estimated tropopause height. I suspect this may be an interference problem, but note that both the recorded pressure and RH values are reasonably continuous. More accurate assessment would require analysis of the absolutely raw binary data; something that would require effort beyond the limits of my IM funding. ---------------------------------------- DQR DATASTREAM(S): sgpsondeB4.00 Raw data stream - documentation not supported sgpsondewnpnB4.a1 alt asc base_time deg dp lat lon pres rh tdry time_offset u_wind v_wind wspd wstat sgpsondewnpnB4.b1 alt asc base_time deg dp lat lon pres rh tdry time_offset u_wind v_wind wspd wstat START DATE/TIME: 11/10/2002 18:24 GMT END DATE/TIME:11/10/2002 18:48 GMT ---------------------------------------- LINK(S): none
DQR ID: D021117.1 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 11-17-2002 DQR SUBJECT: SGP/SONDE/C1 - Questionable RH: CF sounding 11/13/2002:2044 SUGGESTIONS: As always, caveat emptor. QUALITY COLOR: Yellow - Suspect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: The RH data in this sounding is erratic between 2km and 10 km, oscillating between reasonable values (~40%RH) and zero. I certainly doubt that this is a real, heretofore unreported, atmospheric phenomenon so I have to conclude that something is probably wrong with the sensor. I have not seen this behavior before. One would have to look at the absolutely raw RH data to explore further. ---------------------------------------- DQR DATASTREAM(S): sgpsondewnpnC1.a1 dp rh sgpsondewnpnC1.b1 dp rh START DATE/TIME: 11/13/2002 20:44 GMT END DATE/TIME:11/13/2002 22:05 GMT ---------------------------------------- LINK(S): none
DQR ID: D021117.2 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 11-17-2002 DQR SUBJECT: SGP/SONDE/B4 - B4 sounding contaminated by interference SUGGESTIONS: None. QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: Much of this sounding is contaminated, apparently by interference from another sonde signal. It is still no clear why this seems to happen more frequently at B4 than the other sites, especially since the wind seems to have been from the west and B4 should be the most upwind station. ---------------------------------------- DQR DATASTREAM(S): sgpsondeB4.00 Raw data stream - documentation not supported sgpsondewnpnB4.a1 alt asc base_time deg dp lat lon pres rh tdry time_offset u_wind v_wind wspd wstat sgpsondewnpnB4.b1 alt asc base_time deg dp lat lon pres rh tdry time_offset u_wind v_wind wspd wstat START DATE/TIME: 11/14/2002 08:30 GMT END DATE/TIME:11/14/2002 10:10 GMT ---------------------------------------- LINK(S): none
DQR ID: D021121.1 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 11-21-2002 DQR SUBJECT: SGP/SONDE/C1 - Contaminated by interference SUGGESTIONS: Caveat emptor. QUALITY COLOR: Yellow - Suspect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: These three soundings are contaminated by interference from another radiosonde. It is not clear why; this doesn't usually happen at the CF where the operators are very experienced and frequency separation is not usually a problem. ---------------------------------------- DQR DATASTREAM(S): sgpsondeC1.00 Raw data stream - documentation not supported sgpsondewnpnC1.a1 alt asc base_time deg dp lat lon pres rh tdry time_offset u_wind v_wind wspd wstat sgpsondewnpnC1.b1 alt asc base_time deg dp lat lon pres rh tdry time_offset u_wind v_wind wspd wstat START DATE/TIME: 11/19/2002 14:23 GMT END DATE/TIME:11/19/2002 16:23 GMT START DATE/TIME: 11/19/2002 17:26 GMT END DATE/TIME:11/19/2002 19:17 GMT START DATE/TIME: 11/19/2002 20:26 GMT END DATE/TIME:11/19/2002 22:04 GMT ---------------------------------------- LINK(S): none
DQR ID: D021121.2 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 11-21-2002 DQR SUBJECT: SGP/SONDE/B1 - Temperature sensor failed SUGGESTIONS: No fix. QUALITY COLOR: Red - Incorrect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: It appears that the temperature sensor on this sonde broke shortly after launch with the effect that the temperatures read approximately 30 degC too low. Other measurements that do not rely on the temperature, for example pressure and wind velocity, should be OK. ---------------------------------------- DQR DATASTREAM(S): sgpsondewnpnB1.a1 dp rh tdry sgpsondewnpnB1.b1 dp rh tdry START DATE/TIME: 11/18/2002 20:43 GMT END DATE/TIME:11/18/2002 22:29 GMT ---------------------------------------- LINK(S): none
DQR ID: D021123.2 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 11-23-2002 DQR SUBJECT: SGP/SONDE/C1 - Interference CF sounding 20021120:0225 SUGGESTIONS: Caveat emptor. QUALITY COLOR: Yellow - Suspect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: Like several soundings on 11/19, this sounding was affected by interference from another radiosonde. ---------------------------------------- DQR DATASTREAM(S): sgpsondeC1.00 Raw data stream - documentation not supported sgpsondewnpnC1.a1 alt asc base_time deg dp lat lon pres rh tdry time_offset u_wind v_wind wspd wstat sgpsondewnpnC1.b1 alt asc base_time deg dp lat lon pres rh tdry time_offset u_wind v_wind wspd wstat START DATE/TIME: 11/20/2002 02:25 GMT END DATE/TIME:11/20/2002 04:12 GMT ---------------------------------------- LINK(S): none
DQR ID: D021201.1 DQR SUBMITTER: Barry Lesht DATE SUBMITTED: 12-01-2002 DQR SUBJECT: SGP/SONDE/C1 - Questionable RH CF sounding 0211211:1130 SUGGESTIONS: No fix QUALITY COLOR: Yellow - Suspect PRB REVIEWED: Y ---------------------------------------- DQR DESCRIPTION: The RH samples in this sounding oscillate between reasonable values (60-80%) and zero. This may be a problem with the RH sensor or the software that alternates between the heated and non-heated RH elements. In either case, the reported values are questionable. More investigation of the raw binary data would be required to diagnose further. ---------------------------------------- DQR DATASTREAM(S): sgpsondewnpnC1.a1 dp rh sgpsondewnpnC1.b1 dp rh START DATE/TIME: 11/21/2002 11:30 GMT END DATE/TIME:11/21/2002 13:11 GMT ---------------------------------------- LINK(S): none