Alert archive / Texas / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 55, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 4, 2001, 5:58 PM CDT for Kinney County, Val Verde County, Texas. It was in force for 62 min. 1 report came from inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties, with what was reported inside it.
The facts
- Issued
- May 4, 2001, 5:58 PM CDT (22:58 UTC)
- Expired
- May 4, 2001, 7:00 PM CDT
- In force
- 62 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Kinney County, TX, Val Verde County, TX
The radar
The Laughlin AFB radar (KDFX), 51 km from the middle of the area, began a volume at 23:01 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 4, 6:55 PM CDT | Hail 0.75 | Brackettville, 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 4, 4:30 PM CDT | Tornado Watch | SPC | 5 hr |
The nearest sounding before it
Del Rio, TX (KDRT), launched 12:00Z, 11.0 hours before the alert went out and 6 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
- 947 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 590 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 318 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 11.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS54 KEWX 042256 SVRSAT TXC271-465-050000- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 558 PM CDT FRI MAY 4 2001 THE NATIONAL WEATHER SERVICE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR THE FOLLOWING COUNTIES IN TEXAS... KINNEY VAL VERDE * UNTIL 700 PM CDT * AT 558 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES SOUTHEAST OF DEL RIO...MOVING NORTHEAST AT 40 MPH. 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 2932 10108 2919 10094 2920 10028 2961 10062
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 May 4, 3:15 PM CDT, 2 hours 43 minutes earlier.
Area forecast discussion, May 4, 3:15 PM CDT, 2 hours 43 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
315 PM CDT FRI MAY 4 2001
WILL EXTEND THE FLASH FLOOD WATCH EAST INTO CENTRAL AND NORTHEASTERN
SECTIONS OF SOUTH CENTRAL TEXAS THIS AFTERNOON AS MOST MODELS DRAG A
SLOW MOVING COMPLEX OF THUNDERSTORMS THROUGH THE AREA TONIGHT. ETA
MODELS WHILE SHOWING POOR PERFORMANCE ON PRECIP FORECASTING HAVE
DONE WELL ON PRECIPITABLE WATER VALUES. STRONG SHORTWAVE LIFTING OUT
OF MEXICO IS TRIGGERING CURRENT THUNDERSTORM ACTIVITY, AND NORTHEAST
MOVEMENT OF THE SHORTWAVE COMBINED WITH GOOD DIFFULENCE ALOFT WILL
ALLOW FOR HEAVY RAINS TO MOVE OVER THE PROPOSED WATCH AREA.
SOUTHEAST COUNTIES MAY MISS OUT ON THE HEAVIEST PART OF THE SQUALL
SO WILL ONLY MENTION LOCALLY HEAVY RAINFALL HERE. LATE TOMORROW THE
AREA WILL LIKELY SEE ANOTHER GOOD FLARE UP OF ORGANIZED
THUNDERSTORMS AND A CHANCE FOR FLOODING, BUT WILL NOT EXTEND THE
WATCH WITH UNCERTAINTY IN WHICH AREAS WILL RECEIVE HEAVIEST RAINS
FOR TONIGHT. GUIDANCE TEMPERATURES LOOK APPROPRIATELY MILD FOR THE
NEXT FEW DAYS.
MODELS GOING IN DIFFERENT DIRECTIONS BEYOND TUESDAY WITH 12Z AVN
ACCELERATING THE UPPER LOW POSITION TO SUPPORT DRY WEATHER OVER
SOUTH TX WEDNESDAY. GUIDANCE NUMBERS CLOSE TO CLIMO, BUT CLIMO EVEN
CALLS FOR A CHANCE OF RAIN. MRF SUGGESTS NW FLOW PATTERN LATE IN THE
WEEK AND WHILE NOGAPS SUGGESTS PROLONGED INSTABILITY IN THE BAJA
REGION. THUS CAN NOT RULE OUT AT LEAST SLIGHT CHANCE POPS FOR ANY
DAY THROUGH NEXT FRIDAY.
PRELIMINARY NUMBERS...
AUS 68/79/70/84 8662
DRT 67/85/69/89 6432
SAT 69/80/70/84 6642
.EWX...FLASH FLOOD WATCH THROUGH TONIGHT FOR ALL OF THE SOUTH ?
CENTRAL TEXAS AND THE HILL COUNTRY EXCEPT FOR FAR SOUTHEAST
COUNTIES.
18In the hours before
Special weather statement, May 4, 1:45 PM CDT, 4 hours 13 minutes before
TXZ171-172-183>190-202>204-050200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 145 PM CDT FRI MAY 4 2001 ...SEVERE THUNDERSTORMS POSSIBLE IN THE HILL COUNTRY THIS AFTERNOON AND TONIGHT... A DEVELOPING LINE OF THUNDERSTORMS IS MOVING ACROSS VAL VERDE COUNTY. THIS LINE IS EXPECTED TO CONTINUE MOVING TOWARD THE EAST AT 20 MPH THIS AFTERNOON AND INCREASE IN AREAL COVERAGE AND INTENSITY. SOME OF THE STORMS COULD APPROACH SEVERE LIMITS...WHICH MEANS THAT LARGE HAIL...GUSTY DAMAGING WINDS...FREQUENT DEADLY LIGHTNING AND LOCALLY HEAVY RAINFALL WHICH COULD PRODUCE FLASH FLOODING MAY OCCUR. THE AREA WITH THE GREATEST RISK OF SEVERE THUNDERSTORMS IS THAT PORTION OF THE TEXAS HILL COUNTRY WEST OF INTERSTATE 35 BETWEEN SAN ANTONIO AND GEORGETOWN...AND ALONG AND NORTH OF U.S. HIGHWAY 90 BETWEEN SAN ANTONIO AND DEL RIO. THIS OUTLOOK APPLIES TO THE FOLLOWING SPECIFIC COUNTIES... GILLESPIE...MEDINA...KENDALL...REAL...BLANCO...KERR...BURNET... BANDERA...LLANO...EDWARDS...KINNEY...UVALDE AND VAL VERDE. ABUNDANT LOW-LEVEL MOISTURE OVER SOUTH TEXAS...COMBINED WITH AN APPROACHING UPPER-LEVEL DISTURBANCE FROM MEXICO...WILL PRODUCE WIDESPREAD SHOWER AND THUNDERSTORM ACTIVITY THIS AFTERNOON AND TONIGHT. SOME OF THE STORMS COULD BE SEVERE. IN ADDITION...A FLASH FLOOD WATCH IS IN EFFECT FOR MUCH OF THE HILL COUNTRY AND ADJACENT SECTIONS OF THE EDWARDS PLATEAU THROUGH TONIGHT. SPOTTER NETWORKS MAY NEED TO BE ACTIVATED AS THE THUNDERSTORMS MOVE INTO THE THREATENED AREA. FOR INFORMATION ON WEATHER THREATS IN SURROUNDING AREAS...REFER TO OUTLOOKS FROM OFFICES IN MIDLAND...SAN ANGELO...FORT WORTH... HOUSTON/GALVESTON AND CORPUS CHRISTI.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 1:42 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 63 min |
| May 4, 1:45 PM CDT | Flash Flood Warning | EWX | Val Verde | 2 hr |
| May 4, 2:43 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 62 min |
| May 4, 3:45 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 60 min |
| May 4, 3:56 PM CDT | Tornado Warning | EWX | Val Verde | 34 min |
| May 4, 4:00 PM CDT | Flash Flood Warning | EWX | Val Verde | 2 hr |
| May 4, 5:30 PM CDT | Flash Flood Warning | EWX | Edwards | 3 hr |
| May 4, 5:55 PM CDT | Flash Flood Warning | EWX | Val Verde | 2 hr |
| May 4, 6:41 PM CDT | Tornado Warning | EWX | Kinney | 64 min |
| May 4, 6:42 PM CDT | Flash Flood Warning | EWX | Kinney | 2 hr |
Nearby
Severe Thunderstorm Warnings in Texas, 2001Every severe thunderstorm warning in 2001
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; radar from the NEXRAD Level II archive.