Alert archive / Texas / Severe Thunderstorm Warnings in 1998

Severe Thunderstorm Warning 87, NWS Houston/Galveston, TX

March 7, 1998Chambers County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Mar 7, 1998, 4:42 AM CST for Chambers County, Texas. It was in force for 48 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 7, 1998, 4:42 AM CST (10:42 UTC)
Expired
Mar 7, 1998, 5:30 AM CST
In force
48 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

County Chambers County, TX

The radar

The Houston radar (KHGX), 47 km from the middle of the area, began a volume at 10:50 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, 10.7 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 1998-03-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 904 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 1998-03-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.1939587897117Sfc1 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
904 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
617 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
159 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.1

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 Mar 7, 3:18 AM CST, 1 hour 24 minutes earlier.

Area forecast discussion, Mar 7, 3:18 AM CST, 1 hour 24 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
318 AM CST SAT MAR 7 1998

STRONG CLUSTER OF STORMS HAVE MOVED OUT OF THE WATERS SE OF HIGH
ISLAND AND INTO LA WITH MDT MESOS INDICATIVE OF THE ENVIORN.  WARM
FRONT APPEARS TO RUN FROM NEAR LCH TO GLS TO JUST OFFSHORE OF PSX
AND THEN COMES ONSHORE BETWEEN CRP/BRO.  RIDGING BEHIND THE FRONT
HAS WEAKENED CONSIDERABLY SINCE 03Z. WIDESPREAD FOG WILL CONTINUE
UNTIL WARM FRONTAL PASSAGE...SEA FOG WILL BE A PROBLEM ALONG THE
IMMEDIATE COAST THIS MORNING. WARM FRONT SHOULD BEGIN THE MARCH
INLAND BEFORE 12Z MAKING SETX MORE VULNERABLE TO THE MUCH
ADVERTISED SVR THREAT.  MDT RISK GLS-IAH AND NORTHEASTWARD-SLIGHT
ELSEWHERE PER SPC. S/W OVER THE  MEX MOUNTAINS LOOKS AS THOUGH IT
WILL BE MOVING INTO THE REGION BETWEEN 15-21Z SPARKING WIDESPREAD
TSRA.  PW 1-1.4...LI <-2...CAPES IN THE 1200-1800 RANGE...STRONG
SFC-700 SHEAR AND FAVORABLE ENVIORN FOR SUPERCELLS.  ISOLATED
TORNADOES A SIGNIFICANT THREAT TODAY MIXED WITH HAIL AND DAMAGING
WINDS.  THREAT SHOULD CHANGE OVER TONIGHT TO MORE OF HAIL AS MID
LEVEL COOLING SETS IN.  CONVECTION ALONG THIS PREFRONTAL TROUGH MAY
LEAVE BEHIND AN INTERSECTING BOUNDARY FOR CONVECTION TO WORK ON WITH
THE COLD FRONT THAT WILL COME THROUGH TONIGHT. GIVEN HOW STRONG THE
SYSTEM IS...RESIDUAL MOISTURE AND THE PACE OF THE FRONT WILL NEED TO
INCLUDE MENTION OF SOME SEVERE FOR TODAY THROUGH TONIGHT...LIMITING
FACTOR ON CONVECTION TONIGHT WILL BE THE MAGNITUDE OF THE CAP. WRAP
AROUND MOISTURE WILL BE PREVELANT SUNDAY SO WILL KEEP CLOUDS IN THE
FCST BUT NO SIG POPS FOR SUNDAY. BREEZY CONDITIONS 15 TO 20 MPH AND
GUSTY INLAND ON SUNDAY...WINDY ON THE COAST 20 TO 25 MPH AND GUSTY.
GUSTS TO GALE LOOK QUITE REASONABLE ON NOSE OF 45-50 KNOT 850 JET
IMPINGING ON COASTAL WATERS SUNDAY. TEMPS WILL BE TAKING A SERIOUS
PLUNGE.  WILL FAVOR THE FAN FOR TEMPS.

45

PRELIMS...
CLL TC/  C/C/E 066/045/057/037  7300
IAH TC/T>E/C/E 071/051/062/039  7400
GLS TE/T>E/E/E 069/056/062/044  7510

In the hours before

Special weather statement, Mar 6, 11:57 PM CST, 4 hours 45 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Mar 7, 7:17 AM CSTSevere Thunderstorm WarningHGXPolk33 min
Mar 7, 8:02 AM CSTTornado WarningHGXPolk33 min
Mar 7, 8:19 AM CSTSevere Thunderstorm WarningHGXTrinity61 min

Nearby

Severe Thunderstorm Warnings in Texas, 1998Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.