Alert archive / Texas / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 39, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 17, 1999, 10:46 PM CST for Val Verde County, Texas. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Mar 17, 1999, 10:46 PM CST (04:46 UTC)
- Expired
- Mar 17, 1999, 11:45 PM CST
- In force
- 59 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
County Val Verde County, TX
The radar
The Laughlin AFB radar (KDFX), 109 km from the middle of the area, began a volume at 04:45 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Mar 17, 6:30 PM CST | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 4.8 hours before the alert went out and 66 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
- 834 J/kg
- Mixed-layer CIN
- -195 J/kg
- Mixed-layer LCL
- 1444 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 180 m²/s²
- 0-3 km storm-relative helicity
- 280 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.6
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KSAT 180445 RRA SVRSAT TXC465-180545- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 1046 PM CST WED MAR 17 1999 THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... VAL VERDE COUNTY IN TEXAS * UNTIL 1145 PM CST * AT 1035 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SEVERE THUNDERSTORMS BETWEEN LANGTRY AND COMSTOCK...AND BETWEEN PANDALE AND JUNO. MOVEMENT WAS TOWARD THE NORTHEAST AT 20 MPH. AT THIS TIME...IT APPEARS THE SEVERE THUNDERSTORMS WILL AFFECT SPARSELY POPULATED AREAS OF VAL VERDE COUNTY...BUT SOME CREEKS AND NORMALLY DRY LOW-WATER CROSSINGS CLOSE TO THE PECOS AND DEVILS RIVERS COULD BECOME FLOODED DUE TO LOCALLY HEAVY RAINFALL. U.S. 90...BETWEEN LANGTRY AND COMSTOCK...AND STATE HIGHWAY 163 BETWEEN JUNO AND COMSTOCK COULD EXPERIENCE HIGH WATER OVER THEM. DAMAGING WINDS...LARGE HAIL AND HEAVY RAIN ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS AND DO NOT ATTEMPT TO DRIVE THROUGH FLOODED CREEKS OR LOW-WATER CROSSINGS. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR VAL VERDE COUNTY UNTIL MIDNIGHT.
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.
In the hours before
Special weather statement, Mar 17, 6:15 PM CST, 4 hours 31 minutes before
TXZ171>173-183>194-202>209-217>225-228-181200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 615 PM CST WED MAR 17 1999 THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TONIGHT AND THURSDAY MORNING OVER MOST OF THE HILL COUNTRY AND WESTERN HALF OF SOUTH CENTRAL TEXAS. A STRONG UPPER STORM SYSTEM OVER THE SOUTHWEST U.S. IS MOVING SLOWLY EASTWARD INTO WEST TEXAS. A LINE OF STRONG THUNDERSTORMS HAS DEVELOPED AHEAD OF THIS DISTURBANCE...MOVING TOWARD THE PECOS RIVER VALLEY AT 30 MPH. SOME OF THE STORMS IN THIS LINE MAY BECOME SEVERE AND PRODUCE DAMAGING HAIL...HEAVY DOWNPOURS AND DEADLY LIGHTNING. THE ASSOCIATED DRY LINE AND COLD FRONT WILL MOVE INTO THE WESTERN SECTIONS OF THE HILL COUNTRY AROUND MIDNIGHT AND THE REST OF SOUTH CENTRAL TEXAS EARLY THURSDAY MORNING. AVERAGE RAINFALL AMOUNTS WILL RANGE FROM 1/2 TO 1 INCH WITH HIGHER TOTALS OF 4 INCHES POSSIBLE DUE TO THE EXPECTED SLOW MOVEMENT OF SOME OF THE STORMS. THE HAZARDOUS WEATHER OUTLOOK NORMALLY WILL BE UPDATED BY MEANS OF THE ZONE FORECASTS, SHORT TERM FORECAST, WATCHES, WARNINGS AND ADVISORIES. THE HAZARDOUS WEATHER OUTLOOK ITSELF WILL BE UPDATED ONLY IF UNEXPECTED HAZARDOUS WEATHER DEVELOPS OR IF EXPECTED HAZARDOUS WEATHER NO LONGER IS FORECAST TO DEVELOP. FOR INFORMATION ON WEATHER THREATS IN AREAS SURROUNDING SOUTH CENTRAL TEXAS, PLEASE REFER TO THE HAZARDOUS WEATHER OUTLOOKS FROM NWS OFFICES IN MIDLAND, SAN ANGELO, FORT WORTH, HOUSTON/GALVESTON AND CORPUS CHRISTI.
Special weather statement, Mar 17, 6:15 PM CST, 4 hours 31 minutes before
TXZ171>173-183>194-202>209-217>225-228-181200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 615 PM CST WED MAR 17 1999 THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS TONIGHT AND THURSDAY MORNING OVER MOST OF THE HILL COUNTRY AND WESTERN HALF OF SOUTH CENTRAL TEXAS. A STRONG UPPER STORM SYSTEM OVER THE SOUTHWEST U.S. IS MOVING SLOWLY EASTWARD INTO WEST TEXAS. A LINE OF STRONG THUNDERSTORMS HAS DEVELOPED AHEAD OF THIS DISTURBANCE...MOVING TOWARD THE PECOS RIVER VALLEY AT 30 MPH. SOME OF THE STORMS IN THIS LINE MAY BECOME SEVERE AND PRODUCE DAMAGING HAIL...HEAVY DOWNPOURS AND DEADLY LIGHTNING. THE ASSOCIATED DRY LINE AND COLD FRONT WILL MOVE INTO THE WESTERN SECTIONS OF THE HILL COUNTRY AROUND MIDNIGHT AND THE REST OF SOUTH CENTRAL TEXAS EARLY THURSDAY MORNING. AVERAGE RAINFALL AMOUNTS WILL RANGE FROM 1/2 TO 1 INCH WITH HIGHER TOTALS OF 4 INCHES POSSIBLE DUE TO THE EXPECTED SLOW MOVEMENT OF SOME OF THE STORMS. THE HAZARDOUS WEATHER OUTLOOK NORMALLY WILL BE UPDATED BY MEANS OF THE ZONE FORECASTS, SHORT TERM FORECAST, WATCHES, WARNINGS AND ADVISORIES. THE HAZARDOUS WEATHER OUTLOOK ITSELF WILL BE UPDATED ONLY IF UNEXPECTED HAZARDOUS WEATHER DEVELOPS OR IF EXPECTED HAZARDOUS WEATHER NO LONGER IS FORECAST TO DEVELOP. FOR INFORMATION ON WEATHER THREATS IN AREAS SURROUNDING SOUTH CENTRAL TEXAS, PLEASE REFER TO THE HAZARDOUS WEATHER OUTLOOKS FROM NWS 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 |
|---|---|---|---|---|
| Mar 17, 9:39 PM CST | Severe Thunderstorm Warning | EWX | Val Verde | 61 min |
| Mar 17, 11:08 PM CST | Tornado Warning | EWX | Val Verde | 32 min |
| Mar 18, 12:49 AM CST | Severe Thunderstorm Warning | EWX | Val Verde | 76 min |
| Mar 18, 2:18 AM CST | Severe Thunderstorm Warning | EWX | Edwards | 72 min |
| Mar 18, 3:25 AM CST | Severe Thunderstorm Warning | EWX | Edwards | 60 min |
| Mar 18, 5:24 AM CST | Flash Flood Warning | EWX | Real | 3 hr |
| Mar 18, 8:47 AM CST | Flash Flood Warning | EWX | Gillespie | 3 hr |
| Mar 18, 9:31 AM CST | Flash Flood Warning | EWX | Kerr | 3 hr |
| Mar 18, 9:46 AM CST | Flash Flood Warning | EWX | Llano | 3 hr |
| Mar 18, 12:10 PM CST | Flash Flood Warning | EWX | Gillespie | 110 min |
| Mar 18, 12:41 PM CST | Flash Flood Warning | EWX | Llano | 114 min |
| Mar 18, 2:49 PM CST | Flash Flood Warning | EWX | Llano | 2 hr |
Nearby
Severe Thunderstorm Warnings in Texas, 1999Every severe thunderstorm warning in 1999
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; radar from the NEXRAD Level II archive.