Alert archive / Texas / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 64, NWS Austin/San Antonio, TX

February 18, 1998Atascosa County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Feb 18, 1998, 7:40 PM CST for Atascosa County, Texas. It was in force for 65 min. 2 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: Feb 18, 1998, 7:40 PM CST (01:40 UTC)
Expired: Feb 18, 1998, 8:45 PM CST
In force: 65 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties

County Atascosa County, TX

The radar

The Austin/San Antonio radar (KEWX), 102 km from the middle of the area, began a volume at 01:40 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
Feb 18, 8:15 PM CST	Hail 0.75	Poteet, TX
Feb 18, 8:55 PM CST	Hail 0.75	Charlotte, 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 nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 1.7 hours before the alert went out and 174 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 274 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 794 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

621 
WUUS1 KSAT 190141 RRA
SVRSAT
TXC013-190245-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
740 PM CST WED FEB 18 1998
 
THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  845 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTH CENTRAL TEXAS
 
   ...ATASCOSA COUNTY
 
AT 740 PM NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM NEAR POTEET. THE STORM IS MOVING EAST
AT 20 MPH.
 
PEOPLE IN THE PATH OF THIS STORM SHOULD BE ALERT TO THE POSSIBILITY
OF LARGE HAIL AND DAMAGING WINDS.  FREQUENT LIGHTNING AND LOCALLY
HEAVY RAIN CAN ALSO OCCUR WITH SEVERE THUNDERSTORMS...FLOODING SMALL
STREAMS...LOW AREAS...AND LOW WATER CROSSINGS.

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, Feb 18, 6:00 PM CST, 1 hour 40 minutes before

TXZ171>173-183>194-202>209-217>225-228-191200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
600 PM CST WED FEB 18 1998

AN UPPER DISTURBANCE WILL PUSH ACROSS SOUTH CENTRAL TEXAS TONIGHT
WITH SCATTERED THUNDERSTORMS POSSIBLE THIS EVENING..MAINLY OVER
EASTERN AND SOUTHERN SECTIONS.  SOME OF THESE STORMS COULD CONTAIN
LARGE HAIL. RAINFALL AMOUNTS SHOULD AVERAGE 1/2 INCH OVER SOUTHERN
AND EASTERN SECTIONS THIS EVENING WITH LOCAL AMOUNTS NEAR 2 INCHES
IN SOME OF THE HEAVIER STORMS.  HAZARDOUS WEATHER IS NOT EXPECTED
ON THURSDAY.

NEARBY HAZARDOUS WEATHER OUTLOOKS INCLUDE:
FOR SOUTHWEST TEXAS...FROM MIDLAND...LBBSPSMAF
FOR THE CONCHO VALLEY...FROM SAN ANGELO...LBBSPSSJT
FOR NORTH TEXAS...FROM FORT WORTH...FTWSPSFTW
FOR SOUTHEAST TEXAS...FROM HOUSTON/GALVESTON...SATSPSHOU
FOR COASTAL BEND/RIO GRANDE PLAINS...FROM CORPUS CHRISTI...SATSPSCRP.

THE HAZARDOUS WEATHER OUTLOOK NORMALLY WILL BE UPDATED BY MEANS OF
THE ZONE FORECASTS...SHORT TERM FORECASTS...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.

ADDITIONAL WEATHER INFORMATION IS AVAILABLE ON THE CENTRAL AND SOUTH
CENTRAL TEXAS HOME PAGE OF THE INTERNET WORLD WIDE WEB AT:
HTTP://WWW.SRH.NOAA.GOV/EWX OR TUNE TO THE CLOSEST NOAA WEATHER RADIO
STATION.

Special weather statement, Feb 18, 6:00 PM CST, 1 hour 40 minutes before

TXZ171>173-183>194-202>209-217>225-228-191200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
600 PM CST WED FEB 18 1998

AN UPPER DISTURBANCE WILL PUSH ACROSS SOUTH CENTRAL TEXAS TONIGHT
WITH SCATTERED THUNDERSTORMS POSSIBLE THIS EVENING..MAINLY OVER
EASTERN AND SOUTHERN SECTIONS.  SOME OF THESE STORMS COULD CONTAIN
LARGE HAIL. RAINFALL AMOUNTS SHOULD AVERAGE 1/2 INCH OVER SOUTHERN
AND EASTERN SECTIONS THIS EVENING WITH LOCAL AMOUNTS NEAR 2 INCHES
IN SOME OF THE HEAVIER STORMS.  HAZARDOUS WEATHER IS NOT EXPECTED
ON THURSDAY.

NEARBY HAZARDOUS WEATHER OUTLOOKS INCLUDE:
FOR SOUTHWEST TEXAS...FROM MIDLAND...LBBSPSMAF
FOR THE CONCHO VALLEY...FROM SAN ANGELO...LBBSPSSJT
FOR NORTH TEXAS...FROM FORT WORTH...FTWSPSFTW
FOR SOUTHEAST TEXAS...FROM HOUSTON/GALVESTON...SATSPSHOU
FOR COASTAL BEND/RIO GRANDE PLAINS...FROM CORPUS CHRISTI...SATSPSCRP.

THE HAZARDOUS WEATHER OUTLOOK NORMALLY WILL BE UPDATED BY MEANS OF
THE ZONE FORECASTS...SHORT TERM FORECASTS...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.

ADDITIONAL WEATHER INFORMATION IS AVAILABLE ON THE CENTRAL AND SOUTH
CENTRAL TEXAS HOME PAGE OF THE INTERNET WORLD WIDE WEB AT:
HTTP://WWW.SRH.NOAA.GOV/EWX OR TUNE TO THE CLOSEST NOAA WEATHER RADIO
STATION.

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 18, 6:03 PM CST	Tornado Warning	EWX	Atascosa	42 min
Feb 18, 6:04 PM CST	Tornado Warning	EWX	Wilson	41 min
Feb 18, 6:17 PM CST	Severe Thunderstorm Warning	EWX	Llano	58 min
Feb 18, 6:29 PM CST	Severe Thunderstorm Warning	EWX	Karnes	46 min
Feb 18, 6:43 PM CST	Tornado Warning	EWX	Karnes	62 min
Feb 18, 6:49 PM CST	Severe Thunderstorm Warning	EWX	Bastrop	56 min
Feb 18, 6:54 PM CST	Severe Thunderstorm Warning	EWX	Burnet	66 min
Feb 18, 7:03 PM CST	Severe Thunderstorm Warning	EWX	Williamson	57 min
Feb 18, 7:22 PM CST	Severe Thunderstorm Warning	EWX	DeWitt, Gonzales	68 min
Feb 18, 7:58 PM CST	Severe Thunderstorm Warning	EWX	Frio	62 min
Feb 18, 8:14 PM CST	Flash Flood Warning	EWX	Atascosa	3 hr
Feb 18, 8:48 PM CST	Severe Thunderstorm Warning	EWX	Atascosa	57 min
Feb 18, 8:57 PM CST	Severe Thunderstorm Warning	EWX	Karnes	63 min

Nearby

Severe Thunderstorm Warnings in Texas, 1998 Every severe thunderstorm warning in 1998

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.