Alert archive / Texas / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 21, NWS Houston/Galveston, TX

April 3, 1993Chambers County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 3, 1993, 9:32 PM CST for Chambers County, Texas. It was in force for 58 min.

The area

The counties it named.

The facts

Issued
Apr 3, 1993, 9:32 PM CST (03:32 UTC)
Expired
Apr 3, 1993, 10:30 PM CST
In force
58 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

County Chambers County, TX

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.5 hours before the alert went out and 149 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 1993-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 5 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 1993-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 346 square meters per square second.19395878Sfc1 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
5 J/kg
Mixed-layer CIN
-464 J/kg
Mixed-layer LCL
538 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
346 m²/s²
0-3 km storm-relative helicity
508 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KGLS 040332
SVRGLS
TXC071-TXZ000-040430-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE GALVESTON TX
932 PM CST (1032 PM CDT) SAT APR 3 1993
 
THE NATIONAL WEATHER SERVICE IN GALVESTON HAS ISSUED A
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
EFFECTIVE UNTIL 1030 PM CST (1130 PM CDT)
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST TEXAS
 
   ...CHAMBERS COUNTY AND GALVESTON BAY...
AT 925 PM...RADAR INDICATED A SEVERE THUNDERSTORM OVER CENTRAL AND EAST
GALVESTON BAY MOVING SLIGHTLY NORTH OF DUE EAST AT 30 TO 35 MILES AN
HOUR. THIS STORM HAS A HISTORY OF PRODUCING HALF TO THREE-QUARTER INCH
SIZED HAIL IN NORTH GALVESTON COUNTY.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
 
MARINERS SHOULD HEAD FOR...OR REMAIN IN...SAFE PORT.
 
NNNN

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, Apr 3, 8:42 PM CST, 50 minutes before
TXZ047-040400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON TX
842 PM CST SAT APR 03 1993

AT 835 PM A STRONG THUNDERSTORM WAS DUMPING VERY HEAVY RAIN NEAR CLEAR
LAKE IN SOUTHERN HARRIS COUNTY AND WAS PRODUCING STREET FLOODING...
INTENSE LIGHTNING ALONG WITH PEA TO MARBLE SIZE HAIL.

THIS STORM WAS MOVING EAST AND NORTHEAST AT 20 MILES AN HOUR.

AVOID AREAS THAT FLOOD EASILY...STAY INDOORS AND AWAY FROM WINDOWS
AND ELECTRICAL APPLIANCES UNTIL THE STORM MOVES AWAY.
Special weather statement, Apr 3, 8:43 PM CST, 49 minutes before
TXZ047-040400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON TX
842 PM CST SAT APR 03 1993

AT 835 PM A STRONG THUNDERSTORM WAS DUMPING VERY HEAVY RAIN NEAR CLEAR
LAKE IN SOUTHERN HARRIS COUNTY AND WAS PRODUCING STREET FLOODING...
INTENSE LIGHTNING ALONG WITH PEA TO MARBLE SIZE HAIL.

THIS STORM WAS MOVING EAST AND NORTHEAST AT 20 MILES AN HOUR.

AVOID AREAS THAT FLOOD EASILY...STAY INDOORS AND AWAY FROM WINDOWS
AND ELECTRICAL APPLIANCES UNTIL THE STORM MOVES AWAY.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 3, 7:11 PM CSTSevere Thunderstorm WarningHGXBrazoria64 min
Apr 3, 7:45 PM CSTSevere Thunderstorm WarningHGXGalveston60 min
Apr 3, 8:21 PM CSTSevere Thunderstorm WarningHGXChambers69 min
Apr 3, 9:46 PM CSTSevere Thunderstorm WarningHGXGalveston59 min
Apr 3, 10:23 PM CSTFlash Flood WarningHGXGalveston2 hr
Apr 3, 10:44 PM CSTFlash Flood WarningHGXHarris91 min

Nearby

Severe Thunderstorm Warnings in Texas, 1993Every severe thunderstorm warning in 1993

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.