Alert archive / Texas / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 42, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 20, 2003, 4:03 AM CDT for Zavala County, Texas. It was in force for 57 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Apr 20, 2003, 4:03 AM CDT (09:03 UTC)
- Expired
- Apr 20, 2003, 5:00 AM CDT
- In force
- 57 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Counties, with a storm outline in the text
County Zavala County, TX
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 nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 9.1 hours before the alert went out and 113 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
- 1268 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 1819 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- -78 m²/s²
- 0-3 km storm-relative helicity
- 75 m²/s²
- Significant tornado parameter
- -0.1
- Supercell composite
- -2.9
The text
As transmitted, in the capitals the NWS used until 2016.
734 WUUS54 KEWX 200903 SVRSAT TXC507-201000- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 402 AM CDT SUN APR 20 2003 THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS... ZAVALA * UNTIL 500 AM CDT * AT 402 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES SOUTHWEST OF LA PRYOR...MOVING EAST AT 20 MPH. * THE SEVERE THUNDERSTORM WILL BE... NEAR LA PRYOR AT 415 AM LARGE HAIL IS POSSIBLE WITH THIS SEVERE THUNDERSTORM. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. LAT...LON 2903 10007 2866 10006 2867 9943 2906 9945 $$
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 Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 2:40 AM CDT, 1 hour 23 minutes earlier.
Area forecast discussion, Apr 20, 2:40 AM CDT, 1 hour 23 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 240 AM CDT SUN APR 20 2003 EARLY THIS MORNING CONVECTION WAS FIRING FROM DEL RIO SOUTHWARD TO NORMANDY MOVING NORTHEAST TOWARDS BRACKETTVILLE. THE DRYLINE JUST WEST OF DEL RIO WAS PROVIDING THE LOW LEVEL FOCUS FOR CONVECTIVE DEVELOPMENT...TRIGGERED BY A VORT MAX IN THE SOUTHWEST FLOW ALOFT MOVING OUT OF MEXICO. THE 00Z DRT SOUNDING HAD A PW OF 1.05 INCHES. THE COLD FRONT HAS MOVED THRU SAN ANGELO AND BROWNWOOD AND WILL BE ENTERING THE HILL COUNTRY BEFORE SUNRISE. THE FRONT WILL PROVIDE ADDITIONAL LOW LEVEL FOCUS FOR SCATTERED CONVECTION TODAY. THE COLD FRONT WILL CONTINUE TO SINK SOUTHWARD TOWARDS THE COAST TODAY BECOMING STATIONARY OVER SOUTH TEXAS. THE MOIST SOUTHWEST FLOW ALOFT AND SHALLOW DEPTH OF THE COOL AIRMASS WILL ENABLE AN OVERRUNNING PATTERN TO DEVELOP KEEPING MUCH OF THE CWFA CLOUDY THRU MONDAY. THE FRONT WASHES OUT TUESDAY WITH GULF RETURN FLOW BECOMING ESTABLISHED. A SERIES OF STRONGER SHORT WAVES IN THE SOUTHWEST FLOW ALOFT WILL TRAVERSE THE CWFA WEDNESDAY AND THURSDAY INCREASING THE CHANCE FOR TSTMS. RIDGING IN THE UPPER LEVELS OCCURS FRIDAY AND SATURDAY IN RESPONSE TO THE NEXT UPPER TROF DROPPING DOWN INTO CALIFORNIA. THIS WILL RESULT IN DRY WEATHER FOR FRIDAY AND SATURDAY. PRELIMINARY NUMBERS... AUS 074/054 072/051 068 31244 SAT 076/058 073/055 076 32344 DRT 081/058 077/059 069 22344 .EWX...NONE. 13/03
Hazardous weather outlook, Apr 19, 5:39 AM CDT, 22 hours 24 minutes before
TXZ171>173-183>194-202>209-217>225-228-201100- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 539 AM CDT SAT APR 19 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE...TODAY THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS EVENING AND TONIGHT EAST OF A LINE ROUGHLY FROM MOUNTAIN HOME TO VANDERPOOL TO SABINAL TO FRIO TOWN TO DILLEY. THUNDERSTORMS WILL FIRE ALONG THE DRYLINE AND WORK EASTWARD. THE MAIN THREATS FOR SEVERE WEATHER WILL BE LARGE HAIL AND DAMAGING WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING MAINLY IN THE EASTERN HILL COUNTRY AND OVERNIGHT IN SOUTH CENTRAL TEXAS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY WEATHER FEATURES WILL PRODUCE A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS SUNDAY NIGHT AND MONDAY AND A CHANCE ON TUESDAY. HOWEVER...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 3:11 AM CDT | Severe Thunderstorm Warning | EWX | Maverick | 19 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2003Every severe thunderstorm warning in 2003
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.