Alert archive / Texas / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 25, NWS Houston/Galveston, TX

February 25, 20084 counties in Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Feb 25, 2008, 9:43 PM CST for 4 counties in Texas. It was in force for 47 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: Feb 25, 2008, 9:43 PM CST (03:43 UTC)
Expired: Feb 25, 2008, 10:30 PM CST
In force: 47 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Austin County, TX, Grimes County, TX, Waller County, TX, Washington County, TX

The radar

The Houston radar (KHGX), 130 km from the middle of the area, began a volume at 03:45 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, 3.7 hours before the alert went out and 285 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: 778 J/kg
Mixed-layer CIN: -303 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 220 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 Feb 25, 8:39 PM CST, 1 hour 4 minutes earlier.

Area forecast discussion, Feb 25, 8:39 PM CST, 1 hour 4 minutes before

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Hazardous weather outlook, Feb 25, 4:40 AM CST, 17 hours 3 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
440 AM CST MON FEB 25 2008

GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226-
227-235>238-261300-
AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND-
GALVESTON-GALVESTON BAY-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY-
MADISON-MATAGORDA-MATAGORDA BAY-MONTGOMERY-POLK-SAN JACINTO-
TRINITY-WALKER-WALLER-WASHINGTON-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM-
WATERS FROM HIGH ISLAND TO FREEPORT 20 TO 60 NM-
WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM-WHARTON-
440 AM CST MON FEB 25 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

AREAS OF FOG...DENSE AT TIMES...WILL AFFECT THE SOUTHERN HALF OF
SOUTHEAST TEXAS...THE BAYS...AND NEARSHORE WATERS. THE FOG WILL
BURN OFF OVER LAND AREAS BY MID MORNING...BUT COULD PERSIST OVER
THE BAYS AND WATERS THROUGH THIS EVENING.

A COLD FRONT WILL CROSS SOUTHEAST TEXAS TONIGHT. A FEW SHOWERS AND
THUNDERSTORMS WILL DEVELOP ALONG THE FRONT. HOWEVER...HAZARDOUS
WEATHER IS NOT EXPECTED.

.DAY TWO...TUESDAY AND TUESDAY NIGHT

THE COMBINATION OF GUSTY NORTHERLY WINDS AND MUCH LOWERED
HUMIDITIES COULD LEAD TO AN INCREASED FIRE DANGER ACROSS THE
NORTHERN AND WESTERN PORTIONS OF SOUTHEAST TEXAS TUESDAY
AFTERNOON.

A LIGHT FREEZE (29 TO 32 DEGREES) IS EXPECTED TUESDAY NIGHT MAINLY
NORTH OF A LINE FROM BRENHAM TO BRYAN TO WILLIS TO MOSS HILL.

.DAYS THREE THROUGH SEVEN...WEDNESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 25, 10:19 PM CST	Severe Thunderstorm Warning	HGX	Colorado	41 min
Feb 25, 10:38 PM CST	Severe Thunderstorm Warning	HGX	Austin, Fort Bend, Waller	21 min
Feb 26, 4:05 AM CST	Wind Advisory	HGX	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more	16 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2008 Every severe thunderstorm warning in 2008

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.