Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 9, NWS Houston/Galveston, TX

January 1, 1999Liberty County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Jan 1, 1999, 11:54 PM CST for Liberty County, Texas. It was in force for 61 min. 1 report 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
Jan 1, 1999, 11:54 PM CST (05:54 UTC)
Expired
Jan 2, 1999, 12:55 AM CST
In force
61 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

County Liberty County, TX

The radar

The Houston radar (KHGX), 80 km from the middle of the area, began a volume at 05:55 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

TimeReportWhereRemark
Jan 2, 12:20 AM CSTThunderstorm WindCountywide, TXNumerous trees blown down across the entire county.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jan 1, 11:00 PM CSTTornado WatchSPC6 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 5.9 hours before the alert went out and 155 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 1999-01-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 437 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 1999-01-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 202 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
437 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
704 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
202 m²/s²
0-3 km storm-relative helicity
238 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.9

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 Jan 1, 7:30 PM CST, 4 hours 24 minutes earlier.

Area forecast discussion, Jan 1, 7:30 PM CST, 4 hours 24 minutes before
SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
730 PM CST FRI JAN 1 1999

NEW TORNADO WATCH HAS BEEN ISSUED BY SPC FOR ALL OF SE TX UNTIL 100
AM.  DEVELOPING SQUALL LINE TO OUR WEST IS MAKING PROGRESS THIS WAY...
AND IT LOOKS TO BE A BUSY EVENING/NIGHT.  PARAMETERS COMING TOGETHER
FOR A COMBINED SEVERE THUNDERSTORM AND FLASH FLOOD EVENT.

WHEN THE STORMS COME TO AN END TOMORROW...WELL BE DEALING WITH OUR
NEXT COLD WAVE AS STRONG NORTH AND NORTHWEST SURFACE WINDS BEHIND THIS
EMERGING BIG EASTERN U.S. STORM BRING COLDER AIR THIS WAY.

.HGX...TORNADO WATCH (WW2) IN EFFECT UNTIL 1 AM.
       FLASH FLOOD WATCH TONIGHT.
       SCA TONIGHT AND SAT.

PRELIMS...
CLL BU 050/052 028/048 025 910
IAH BU 062/063 030/050 027 920
GLS BU 066/066 041/050 035 920

42/44/31/45/32/47/36

In the hours before

Special weather statement, Jan 1, 6:53 PM CST, 5 hours 1 minute before
GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-
226-227-235>238-020155-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
653 PM CST FRI JAN 1 1999

...TORNADO WATCH REMAINS IN EFFECT FOR THE NORTHERN PORTIONS OF
SOUTHEAST TEXAS UNTIL 1000 PM CDT...

AT 650 PM CST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF STRONG TO SEVERE THUNDERSTORMS EXTENDED ALONG THE I-35
CORRIDOR FROM JUST EAST OF AUSTIN SOUTH TO SAN ANTONIO. THE LINE WAS
MOVING NORTHEAST AT 25 MPH AND WILL APPROACH THE EASTERN PORTIONS OF
SOUTHEAST TEXAS AFTER 715 PM. DAMAGING WINDS...FREQUENT LIGHTNING
AND LARGE WILL BE POSSIBLE AS THIS LINE MOVES THROUGH THE AREA.
THERE IS ALSO A THREAT OF TORNADOES AND A THREAT OF FLASH FLOODING. A
FLASH FLOOD WATCH REMAINS IN EFFECT FOR ALL OF SOUTHEAST TONIGHT.

PEOPLE ACROSS SOUTHEAST TEXAS SHOULD CONTINUE TO MONITOR THE LATEST
WEATHER INFORMATION. STAY TUNED TO NOAA WEATHER RADIO...TV...OR YOUR
LOCAL NEW SOURCE FOR LATER STATEMENTS AND ADDITIONAL WATCHES AND
WARNINGS.
Special weather statement, Jan 1, 7:20 PM CST, 4 hours 34 minutes before
GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226-227-
235>238-020700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
720 PM CST FRI JAN 1 1999

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WATCH FOR ALL OF
SOUTHEAST TEXAS UNTIL 1 AM SATURDAY MORNING.  COUNTIES INCLUDED IN
THE WATCH AREA ARE:  AUSTIN...BRAZORIA...BRAZOS...BURLESON...
CHAMBERS...COLORADO...FORT BEND...GALVESTON...GRIMES...HARRIS...
HOUSTON...JACKSON...LIBERTY...MADISON...MATAGORDA...MONTGOMERY...
POLK...SAN JACINTO...TRINITY...WALKER...WALLER...WASHINGTON...
WHARTON...AND THE ADJACENT COASTAL WATERS.

A SQUALL LINE HAS DEVELOPED IN CENTRAL TEXAS THIS EVENING AS A
STRONG UPPER LEVEL DISTURBANCE COLLIDES INTO WARM MOIST AIR.
UPPER LEVEL WINDS WILL BE SUPPORTIVE FOR TORNADO FORMATION AHEAD OF...
AND ALONG...THE LINE.  TORNADOES HAVE BEEN VERIFIED EARLIER THIS
AFTERNOON.  THE SQUALL LINE WILL MOVE WEST TO EAST ACROSS THE AREA
BRINGING A THREAT OF STRONG DAMAGING WINDS AND LARGE HAIL IN
ADDITION TO TORNADOES.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE
WEATHER AND TORNADOES IN AND NEAR THE WATCH AREA.  PERSONS IN THOSE
AREAS SHOULD BE PREPARED TO TAKE SHELTER SHOULD A WARNING BE ISSUED.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL TELEVISION OR RADIO
STATIONS...OR YOUR CABLE TELEVISION PROVIDER FOR LATER STATEMENTS
CONCERNING THIS POTENTIALLY DANGEROUS SEVERE WEATHER THREAT.
Special weather statement, Jan 1, 11:05 PM CST, 49 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jan 1, 7:05 PM CSTTornado WarningHGXBurleson55 min
Jan 1, 7:41 PM CSTSevere Thunderstorm WarningHGXHouston59 min
Jan 1, 7:51 PM CSTTornado WarningHGXBrazos59 min
Jan 1, 8:37 PM CSTSevere Thunderstorm WarningHGXMadison48 min
Jan 1, 8:48 PM CSTTornado WarningHGXHarris42 min
Jan 1, 9:01 PM CSTTornado WarningHGXColorado44 min
Jan 1, 9:12 PM CSTSevere Thunderstorm WarningHGXGrimes, Washington63 min
Jan 1, 9:15 PM CSTSevere Thunderstorm WarningHGXHouston65 min
Jan 1, 9:35 PM CSTTornado WarningHGXMontgomery65 min
Jan 1, 9:47 PM CSTTornado WarningHGXHarris63 min
Jan 1, 9:50 PM CSTTornado WarningHGXSan Jacinto65 min
Jan 1, 9:55 PM CSTTornado WarningHGXLiberty60 min
Jan 1, 10:10 PM CSTSevere Thunderstorm WarningHGXWalker65 min
Jan 1, 10:34 PM CSTTornado WarningHGXPolk61 min
Jan 1, 10:41 PM CSTTornado WarningHGXMontgomery64 min
Jan 1, 10:46 PM CSTTornado WarningHGXHarris64 min
Jan 1, 10:47 PM CSTTornado WarningHGXLiberty28 min
Jan 1, 10:47 PM CSTTornado WarningHGXLiberty58 min
Jan 1, 11:25 PM CSTTornado WarningHGXChambers, Galveston90 min
Jan 1, 11:25 PM CSTTornado WarningHGXChambers65 min
Jan 1, 11:49 PM CSTSevere Thunderstorm WarningHGXHarris61 min
Jan 1, 11:50 PM CSTSevere Thunderstorm WarningHGXChambers, Galveston65 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; radar from the NEXRAD Level II archive.