Alert archive / Texas / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 40, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Mar 18, 1999, 12:49 AM CST for Val Verde County, Texas. It was in force for 76 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 18, 1999, 12:49 AM CST (06:49 UTC)
- Expired
- Mar 18, 1999, 2:05 AM CST
- In force
- 76 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 06:53 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 nearest sounding before it
Del Rio, TX (KDRT), launched 00:00Z, 6.8 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 180648 RRA SVRSAT TXC465-180805- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 1249 AM CST THU MAR 18 1999 THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... VAL VERDE COUNTY IN TEXAS * UNTIL 205 AM CST * AT 1245 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES NORTHEAST OF COMSTOCK MOVING TOWARDS THE NORTHEAST AT NEAR 20. * THE SEVERE THUNDERSTORM WILL BE NEAR... CARTA VALLEY AND LOMA ALTA BY 1 AM. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS JDS
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, 10:46 PM CST | Severe Thunderstorm Warning | EWX | Val Verde | 59 min |
| Mar 17, 11:08 PM CST | Tornado Warning | EWX | Val Verde | 32 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.