Alert archive / Texas / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 120, NWS Houston/Galveston, TX

May 30, 1997Liberty County, San Jacinto County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at May 30, 1997, 11:30 PM CDT for Liberty County, San Jacinto County, Texas. It was in force for 60 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
May 30, 1997, 11:30 PM CDT (04:30 UTC)
Expired
May 31, 1997, 12:30 AM CDT
In force
60 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

Counties Liberty County, TX, San Jacinto County, TX

The radar

The Houston radar (KHGX), 100 km from the middle of the area, began a volume at 04:32 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.5 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 00:00Z on 1997-05-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1565 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 1997-05-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -40 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1565 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
976 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-40 m²/s²
0-3 km storm-relative helicity
-8 m²/s²
Significant tornado parameter
0.0
Supercell composite
-1.1

Open this sounding in Storm Lab

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.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at May 30, 8:04 PM CDT, 3 hours 26 minutes earlier.

Area forecast discussion, May 30, 8:04 PM CDT, 3 hours 26 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
745 PM CDT FRI MAY 30 1997

WL NEED SOME TWEAKING OF 1ST/2D NOS/WORDING. COMPROMISE BETWEEN
NGM/ETA ON CDFNT MOVEMENT BES

In the hours before

Special weather statement, May 30, 8:30 PM CDT, 3 hours before
TXZ176>179-195>200-210>214-226-227-235>238-511-513-311000-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
830 PM CDT FRI MAY 30 1997

A SLIGHT RISK OF SEVERE WEATHER WILL CONTINUE TO EXIST OVER SOUTHEAST
TEXAS TONIGHT.  A LATE SPRING COLD FRONT WAS MOVING ACROSS NORTH
CENTRAL TEXAS EARLY THIS EVENING...AND WAS NEAR A TYLER...WACO...
SAN ANGELO LINE. THIS FRONT IS EXPECTED TO APPROACH THE COLLEGE
STATION AREA AROUND 1-2 AM...THE HOUSTON AREA AROUND 3-4 AM...AND
GALVESTON AROUND 5-6 AM.

THE AIRMASS OVER SOUTHEAST TEXAS REMAINS VERY MOIST AND UNSTABLE
THIS EVENING...AND IS EXPECTED TO REMAIN SO WHEN THE COLD FRONT
APPROACHES. THE WIND PROFILE IS SUCH THAT WIDESPREAD CONVECTION OVER
OUR REGION IS NOT ANTICIPATED. HOWEVER...ENOUGH INSTABILITIES EXIST
THAT SOME OF THE THUNDERSTORMS THAT DEVELOP TONITE IN OUR
REGION...AHEAD OF AND NEAR THE COLD FRONT...MAY BECOME SEVERE.

THE THREAT OF SEVERE WEATHER WILL COME IN THE FORM OF LARGE HAIL...
DAMAGING WINDS AND...POSSIBLY ISOLATED TORNADOES.  RAINFALL AMOUNTS
WITH THESE STORMS WILL AVERAGE 1/2 TO 1 INCH WITH ISOLATED TOTALS OF
2 TO 3 INCHES POSSIBLE BY SATURDAY MORNING.

EMERGENCY MANAGERS AND SKYWARN SPOTTERS SHOULD PREPARE FOR POSSIBLE
ACTIVATION LATER TONIGHT.

RESIDENTS ACROSS THE AREA ARE ENCOURAGED TO MONITOR NOAA WEATHER
RADIO AND OTHER WEATHER NEWS SOURCES FOR FURTHER UPDATES AND POSSIBLE
WATCHES AND WARNINGS.

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 30, 10:13 PM CDTSevere Thunderstorm WarningHGXHouston, Madison62 min
May 30, 10:44 PM CDTSevere Thunderstorm WarningHGXBrazos61 min
May 30, 10:59 PM CDTSevere Thunderstorm WarningHGXPolk, Trinity61 min
May 30, 11:02 PM CDTTornado WarningHGXMadison58 min
May 30, 11:12 PM CDTSevere Thunderstorm WarningHGXGrimes, Walker63 min
May 30, 11:20 PM CDTSevere Thunderstorm WarningHGXHarris, Montgomery55 min
May 30, 11:38 PM CDTTornado WarningHGXHarris67 min
May 30, 11:47 PM CDTSevere Thunderstorm WarningHGXAustin58 min
May 30, 11:50 PM CDTSevere Thunderstorm WarningHGXMontgomery55 min
May 31, 12:07 AM CDTSevere Thunderstorm WarningHGXWashington68 min
May 31, 12:23 AM CDTFlash Flood WarningHGXHarris, Montgomery3 hr
May 31, 12:27 AM CDTTornado WarningHGXHarris, Liberty, Montgomery63 min
May 31, 12:30 AM CDTTornado WarningHGXAustin60 min
May 31, 12:54 AM CDTSevere Thunderstorm WarningHGXChambers66 min
May 31, 1:02 AM CDTSevere Thunderstorm WarningHGXColorado58 min
May 31, 1:28 AM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Harris62 min
May 31, 1:28 AM CDTSevere Thunderstorm WarningHGXGalveston62 min
May 31, 3:59 AM CDTTornado WarningHGXJackson61 min

Nearby

Severe Thunderstorm Warnings in Texas, 1997Every severe thunderstorm warning in 1997

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.