Alert archive / Texas / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 143, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 30, 1999, 9:04 PM CDT for Lavaca County, Texas. It was in force for 56 min. 3 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 30, 1999, 9:04 PM CDT (02:04 UTC)
- Expired
- May 30, 1999, 10:00 PM CDT
- In force
- 56 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
County Lavaca County, TX
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 30, 9:20 PM CDT | Thunderstorm Wind | Vienna, TX | |
| May 30, 9:35 PM CDT | Hail 2.5 | Vienna, TX | |
| May 30, 9:50 PM CDT | Tornado F1 | Vienna, TX | Department of Public Safety officers reported that a small tornado, preceded by severe winds, heavy rain and large hail, formed near Vienna and move eastward briefly. It caused minor damage to trees and vegetation in the area, then disappeared. |
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 nearest sounding before it
Corpus Christi, TX (KCRP), launched 00:00Z, 2.1 hours before the alert went out and 188 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
- 3761 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 797 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 51 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 8.8
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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, May 30, 7:15 PM CDT, 1 hour 49 minutes before
TXZ171>173-183>194-202>209-217>225-228-310300- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 715 PM CDT SUN MAY 30 1999 SCATTERED THUNDERSTORMS ARE EXPECTED THROUGH THE EVENING HOURS TODAY OVER THE DEL RIO AREA AND WESTERN HILL COUNTRY AS AN UPPER AIR DISTURBANCE INTERACTS WITH MOIST...UNSTABLE AIR WHICH CONTINUES TO BLANKET SOUTH TEXAS. ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ARE ALSO POSSIBLE OVER THE EXTREME EASTERN COUNTIES OF SOUTH CENTRAL TEXAS...INCLUDING DEWITT...LAVACA...FAYETTE AND GONZALES COUNTIES INTO THIS EVENING...TRIGGERED BY THE OUTFLOW OF THUNDERSTORMS FURTHER EAST. BRIEF HEAVY RAINS OF 1 TO 2 INCHES PER HOUR...GUSTY WINDS AND FREQUENT LIGHTNING CAN BE EXPECTED WITH THESE THUNDERSTORMS. CAMPERS AND OTHERS INVOLVED IN OUTDOOR ACTIVITIES SHOULD BE READY TO SEEK SAFE SHELTER IF A THUNDERSTORM OCCURS. IN BOTH AREAS...THE THUNDERSTORMS SHOULD DIMINISH QUICKLY AFTER SUNDOWN. 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, May 30, 7:15 PM CDT, 1 hour 49 minutes before
TXZ171>173-183>194-202>209-217>225-228-310300- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX 715 PM CDT SUN MAY 30 1999 SCATTERED THUNDERSTORMS ARE EXPECTED THROUGH THE EVENING HOURS TODAY OVER THE DEL RIO AREA AND WESTERN HILL COUNTRY AS AN UPPER AIR DISTURBANCE INTERACTS WITH MOIST...UNSTABLE AIR WHICH CONTINUES TO BLANKET SOUTH TEXAS. ISOLATED TO WIDELY SCATTERED THUNDERSTORMS ARE ALSO POSSIBLE OVER THE EXTREME EASTERN COUNTIES OF SOUTH CENTRAL TEXAS...INCLUDING DEWITT...LAVACA...FAYETTE AND GONZALES COUNTIES INTO THIS EVENING...TRIGGERED BY THE OUTFLOW OF THUNDERSTORMS FURTHER EAST. BRIEF HEAVY RAINS OF 1 TO 2 INCHES PER HOUR...GUSTY WINDS AND FREQUENT LIGHTNING CAN BE EXPECTED WITH THESE THUNDERSTORMS. CAMPERS AND OTHERS INVOLVED IN OUTDOOR ACTIVITIES SHOULD BE READY TO SEEK SAFE SHELTER IF A THUNDERSTORM OCCURS. IN BOTH AREAS...THE THUNDERSTORMS SHOULD DIMINISH QUICKLY AFTER SUNDOWN. 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 |
|---|---|---|---|---|
| May 30, 9:34 PM CDT | Tornado Warning | EWX | Fayette, Lavaca | 41 min |
| May 30, 10:14 PM CDT | Tornado Warning | EWX | Lavaca | 46 min |
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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.