Alert archive / Texas / Severe Thunderstorm Warnings in 2003
Severe Thunderstorm Warning 10, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 18, 2003, 4:03 AM CST for Llano County, Texas. It was in force for 27 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
- Mar 18, 2003, 4:03 AM CST (10:03 UTC)
- Expired
- Mar 18, 2003, 4:30 AM CST
- In force
- 27 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Counties, with a storm outline in the text
County Llano 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, 10.1 hours before the alert went out and 252 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2977 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
301 WUUS54 KEWX 181003 SVRSAT TXC299-181100- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 402 AM CST TUE MAR 18 2003 THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS... LLANO * UNTIL 430 AM CST * AT 400 AM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS OVER SOUTHWEST LLANO COUNTY...MOVING NORTHEAST AT 30 MPH. SOME OF THESE THUNDERSTORMS COULD BE SEVERE. LARGE HAIL IS POSSIBLE WITH THESE THUNDERSTORMS...SOME THAT ARE SEVERE. IF YOU ARE IN THE PATH OF THE STORM...PUT YOUR CAR IN A GARAGE AND MOVE TO A SUBSTANTIAL SHELTER. STRONG GUSTY WINDS ARE ALSO POSSIBLE WITH THESE THUNDERSTORMS. INTENSE LIGHTNING IS OCCURRING WITH THIS STORM. IF OUTDOORS...STAY AWAY FROM HIGH AREAS...METAL OBJECTS...AND TALL ISOLATED TREES. MOVE INDOORS IF POSSIBLE BUT STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING THE TELEPHONE UNLESS IT IS AN EMERGENCY. LAT...LON 3060 9886 3060 9851 3086 9845 3086 9891 $$
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 Mar 18, 2:39 AM CST, 1 hour 24 minutes earlier.
Area forecast discussion, Mar 18, 2:39 AM CST, 1 hour 24 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 239 AM CST TUE MAR 18 2003 CONVECTION FIRING OVER NORTHWEST HILL COUNTRY MOVING RAPIDLY NORTHEAST WITH THE STEERING WINDS. DRY LINE HAS MOVED INTO AREA AND WAS LAST SEEN MOVING SOUTHEAST AT 24 KTS. ORIENTATION OF WINDS ALOFT WILL KEEP DRY LINE MOVING EAST BUT NOT MUCH TO THE SOUTH. ALSO BECAUSE OF WESTERLY WINDS ALOFT, DOWNSLOPE OFF THE ROCKIES WILL LOWER THE P.W.S OUT WEST, SO WILL NOT MENTION POPS OVER THERE WITH THIS PACKAGE. THE SEVERE WX THREAT LOOKS GOOD FOR THE NORTHEAST COUNTIES AS THIS PART WILL BE IN THE LEFT FRONT QUAD OF THE UPPER LEVEL JET WITH GOOD VEERING IN THE LOW LEVELS. LOWER THICKNESS ADVECTION AND SFC GRADIENT BEHIND DRY LINE WILL KEEP WEST AND SOUTHWEST WINDS GUSTING TODAY. TONIGHT...DRY LINE/PACIFIC FRONT IS NOW EAST OF OUR CWA AND HANGING NEAR THE MIDDLE TX COAST. SOME LIMITED WRAP AROUND CLOUDINESS TONIGHT WITH TEMPS SLIGHTLY BELOW NORMAL. WEDNESDAY...CAA ENDS DURING THE MORNING AND SOUTHWEST TO WEST WINDS LIGHTEN UP. DAYTIME HIGHS SHUD BE WELL ABOVE NORMAL. WEDNESDAY NIGHT...THE CANADIAN AIR IS NOW READY TO FLOW SOUTH INTO TEXAS BEHIND THE EXITING UPPER LOW. SFC WINDS WILL SHIFT TO THE NORTHWEST AT 10 TO 15 MPH WITH GUSTS TO 25 MPH. TEMPS ABOUT THE SAME AS TONIGHT. THURSDAY...STRONG SHORT WAVE TROUGH MOVES THROUGH TEXAS WITH A LOW POP FOR SPRINKLES EASTERN SECTIONS. LIGHT NORTH WINDS PREVAIL UNDER MOSTLY SUNNY SKIES. TEMPS NEAR SEASONAL NORMS. THURSDAY NIGHT...LIGHT WINDS AND SUBSIDENT REGIME WILL ALLOW GOOD RADIATIONAL COOLING. EXPECT MINS 10 DEGREES BELOW NORM. FRIDAY THROUGH MONDAY...CLOUDS AND FOG RETURN FRIDAY AS THE NEXT UPPER LOW DIGS SOUTHEAST ACROSS THE ROCKIES AND MOVES INTO WEST TEXAS SATURDAY MORNING. ATMOSPHERIC DESTABILIZATION SATURDAY WILL SET US UP FOR A ROUND OF SHOWERS AND THUNDERSTORMS ENDING SUNDAY AS THE UPPER LOW MOVES ACROSS NORTH TEXAS. A CLEAR DRY MONDAY IN STORE. PRELIM NUMBER... AUS 76 45 77 45 71 40001 SAT 78 48 80 50 75 40001 DRT 82 51 84 51 78 -0000 .EWX...SLGT RISK SVR TSTMS TODAY KERRVILLE TO SAN ANTONIO TO CUERO AND EASTWARD. 06/08 . .EWX...NONE.
Hazardous weather outlook, Mar 18, 3:32 AM CST, 31 minutes before
TXZ171>173-183>194-202>209-217>225-228-181200- HAZARDOUS WEATHER OUTLOOK UPDATED NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 332 AM CST TUE MAR 18 2003 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS. .DAY ONE... A CHANCE OF SHOWERS AND THUNDERSTORMS TONIGHT OVER PARTS OF THE HILL COUNTRY. SOME THUNDERSTORMS COULD BE CLOSE TO SEVERE... CAUSING STRONG WINDS AND HAIL. SPOTTER ACTIVATION MAY BE REQUIRED. .DAYS TWO THROUGH SEVEN... A CHANCE OF SHOWERS AND THUNDERSTORMS TUESDAY OVER THE HILL COUNTRY TO PARTS OF CENTRAL TEXAS. RAIN IS NOT EXPECTED WEDNESDAY THROUGH FRIDAY. ON SATURDAY AND SUNDAY...AN EARLY SPRING WEATHER SYSTEM WILL APPROACH PARTS OF CENTRAL AND SOUTH CENTRAL TEXAS FROM THE WEST...CAUSING A CHANCE OF SHOWERS OR THUNDERSTORMS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED TUESDAY.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 18, 4:23 AM CST | Severe Thunderstorm Warning | EWX | Burnet | 37 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.