Alert archive / Texas / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 74, NWS San Angelo, TX
NWS San Angelo, TX issued this severe thunderstorm warning at Apr 29, 2002, 6:20 PM CDT for Shackelford County, Texas. It was in force for 40 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 29, 2002, 6:20 PM CDT (23:20 UTC)
- Expired
- Apr 29, 2002, 7:00 PM CDT
- In force
- 40 min
- Issued by
- NWS San Angelo, TX
- Area
- Counties, with a storm outline in the text
County Shackelford County, TX
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 29, 6:40 PM CDT | Hail 1.75 | Moran, TX |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 29, 5:30 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 11.3 hours before the alert went out and 166 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 1434 J/kg
- Mixed-layer CIN
- -236 J/kg
- Mixed-layer LCL
- 1109 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 258 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
179 WUUS54 KSJT 292320 SVRSJT TXC417-300000- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SAN ANGELO TX 619 PM CDT MON APR 29 2002 THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SHACKELFORD COUNTY IN NORTH CENTRAL TEXAS * UNTIL 700 PM CDT * AT 617 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTH OF MORAN...OR ABOUT 12 MILES NORTHWEST OF CISCO...MOVING NORTHEAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... MORAN AT 630 PM CDT IBEX AT 650 PM CDT THIS THUNDERSTORM HAS THE POTENTIAL TO PRODUCE GOLFBALL SIZE HAIL AND WINDS TO 70 MPH. SEVERE THUNDERSTORMS PRODUCE LARGE HAIL...DAMAGING WINDS...DANGEROUS LIGHTNING...AND VERY HEAVY RAINFALL. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. LAT...LON 3252 9931 3252 9910 3271 9866 3290 9888
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Angelo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 29, 5:11 PM CDT, 1 hour 9 minutes earlier.
Area forecast discussion, Apr 29, 5:11 PM CDT, 1 hour 9 minutes before
WEST CENTRAL TEXAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE SAN ANGELO TX 511 PM CDT MON APR 29 2002 .CURRENT...THUNDERSTORMS CURRENTLY DEVELOPING ALONG A BOUNDARY ALONG A WINTERS TO BAIRD. THUNDERSTORMS DEVELOPING IN A VERY UNSTABLE AIRMASS...HOWEVER A WEAK CAP STILL EXISTS. THIS CAP LOOKS LIKE IT IS ABOUT TO BREAK AND AFTER COORDINATION WITH SPC WILL NEED TO UPDATE ZONES FOR THUNDERSTORM WATCH. THUNDERSTORMS SHOULD BE ISOLATED IN NATURE. WITH THE WATCH CONFIGURATION WILL NEED TO MAKE SOME ADJUSTMENTS TO THE ZONE BREAK OUT. 27/BRAZZELL ****245 PM DISCUSSION BELOW****** CURRENT...SATELLITE IMAGERY SHOWS SHOW-WAVE RIDGE OVER NEW MEXICO WITH MOST UPPER-LEVEL MOISTURE NOW NORTH OF OUR CWFA. AT THE SURFACE...DRYLINE CONTINUES ALONG OUR WESTERN ZONES. DAYS 1-3...TIME-HEIGHT ANALYSIS OF MODEL RELATIVE HUMIDITY DATA INDICATES NO SIGNIFICANT MOISTURE WILL RETURN TO WEST CENTRAL TEXAS THROUGH THURSDAY. HOWEVER...WILL CONTINUE PARTLY CLOUDY THROUGH THURSDAY TO ACCOUNT FOR POSSIBLE THUNDERSTORM DEVELOPMENT AND OCCASIONAL CIRRUS. AS FOR POPS...WILL INCLUDE ISOLATED EVENING WORDING FOR THE CENTRAL AND EASTERN BIG COUNTRY AS WELL AS THE HEARTLAND. ALSO...WILL INCLUDE WORDING FOR POSSIBLE SEVERE STORMS. OTHERWISE...POPS NIL. TEMPERATURES CLOSE TO GUIDANCE LOOK GOOD WITH COOLER OVERNIGHT LOWS WEDNESDAY NIGHT AND HIGHS THURSDAY ONLY IN THE 75 TO 80 RANGE. SURFACE WINDS WILL CONTINUE TO BE SOUTHERLY TONIGHT AND TOMORROW WITH A SHIFT TO THE WEST BY WEDNESDAY MORNING IN RESPONSE TO THE APPROACHING COLD FRONT. WINDS TOMORROW WILL INCREASE INTO THE BREEZY RANGE BY THE AFTERNOON. DAYS 4-7...TEMPERATURES WILL BE COOLER FOR FRIDAY THROUGH THE WEEKEND WITH AN AIRMASS CHANGE BEHIND THE COLD FRONT. WILL CONTINUE SLIGHT CHANCE WORDING FOR SATURDAY THROUGH MONDAY. CCF PRELIMS... ABI 065/095/068/093 0000 SJT 068/098/070/095 0000 JCT 070/095/068/095 0000 .SJT...NONE. 23/HUBER
In the hours before
Special weather statement, Apr 29, 2:07 PM CDT, 4 hours 13 minutes before
TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-140- 154-155-168>170-291500- WEST CENTRAL TEXAS HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SAN ANGELO TX 207 PM CDT MON APR 29 2002 ...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE IN THE BIG COUNTRY AND HEARTLAND THIS EVENING... IT WILL BECOME UNSTABLE THIS EVENING ACROSS THE BIG COUNTRY AND HEARTLAND THIS AFTERNOON...DUE TO INCREASING MOISTURE FROM THE EAST AND STRONG SURFACE HEATING. A WEAK FRONTAL BOUNDARY ACROSS THE REGION WILL HELP TO TRIGGER A FEW THUNDERSTORMS ALONG AND EAST OF A HASKELL...TO ABILENE...TO BRADY LINE. STORMS WILL END NEAR SUNSET. ISOLATED SEVERE STORMS ARE POSSIBLE...WITH STRONG GUSTY WINDS TO 60 MPH AND LARGE HAIL POSSIBLE. SPOTTER ACTIVATION MAY BE NEEDED. FOR ADDITIONAL INFORMATION PLEASE SEE STATEMENTS AND OUTLOOKS FROM NATIONAL WEATHER SERVICE OFFICES ACROSS TEXAS...OKLAHOMA...AND NEW MEXICO.
The office that day
Everything else NWS San Angelo, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 29, 5:40 PM CDT | Severe Thunderstorm Warning | SJT | Callahan, Taylor | 50 min |
| Apr 29, 6:14 PM CDT | Severe Thunderstorm Warning | SJT | Crockett | 61 min |
| Apr 29, 6:29 PM CDT | Severe Thunderstorm Warning | SJT | Callahan | 46 min |
| Apr 29, 6:56 PM CDT | Severe Thunderstorm Warning | SJT | Shackelford | 49 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2002Every severe thunderstorm warning in 2002
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.