Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 79, NWS Houston/Galveston, TX

April 25, 2009Brazos County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 25, 2009, 3:33 AM CDT for Brazos County, Texas. It was in force for 27 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: Apr 25, 2009, 3:33 AM CDT (08:33 UTC)
Expired: Apr 25, 2009, 4:00 AM CDT
In force: 27 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

County Brazos County, TX

The radar

The Ft Hood radar (KGRK), 104 km from the middle of the area, began a volume at 08:35 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, 8.6 hours before the alert went out and 304 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: 1376 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 958 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 62 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 Apr 25, 12:03 AM CDT, 3 hours 30 minutes earlier.

Area forecast discussion, Apr 25, 12:03 AM CDT, 3 hours 30 minutes before

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Hazardous weather outlook, Apr 24, 12:51 PM CDT, 14 hours 42 minutes before

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1251 PM CDT FRI APR 24 2009

GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226-
227-235>238-251800-
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-
1251 PM CDT FRI APR 24 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

...SLIGHT RISK FOR SEVERE THUNDERSTORMS IN THE LATE AFTERNOON AND
EARLY EVENING...

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS BETWEEN LATE THIS
AFTERNOON INTO THE MID EVENING. THE SLIGHT RISK AREA INCLUDES
LOCATIONS ALONG AND WEST OF A LINE FROM GROVETON TO KATY TO EDNA.
AS AN UPPER LEVEL DISTURBANCE MOVES OVER SOUTHEAST TEXAS THIS
AFTERNOON...SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP.
ISOLATED STRONG TO SEVERE THUNDERSTORMS MAY OCCUR WITH THE MAIN
THREAT BEING DAMAGING WINDS AND HAIL. ISOLATED TORNADOES ARE
POSSIBLE...ALSO. RAINFALL AMOUNTS UP TO ONE HALF INCH CAN BE
EXPECTED WITH ISOLATED TOTALS BETWEEN ONE AND TWO INCHES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER AND EMERGENCY MANAGER ACTIVATION MAY BE NEEDED LATE THIS
AFTERNOON INTO THIS EVENING.

In the hours before

Local storm report, Apr 25, 12:46 AM CDT, 2 hours 47 minutes before

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Local storm report, Apr 25, 1:39 AM CDT, 1 hour 54 minutes before

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Local storm report, Apr 25, 2:12 AM CDT, 1 hour 21 minutes before

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Local storm report, Apr 25, 2:45 AM CDT, 48 minutes before

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Local storm report, Apr 25, 2:52 AM CDT, 41 minutes before

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Local storm report, Apr 25, 2:58 AM CDT, 35 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 7:46 PM CDT	Areal Flood Advisory	HGX	Brazoria, Fort Bend, Harris	119 min
Apr 24, 8:25 PM CDT	Areal Flood Advisory	HGX	Harris	2 hr
Apr 24, 8:41 PM CDT	Flash Flood Warning	HGX	Brazoria, Fort Bend, Galveston, Harris	3 hr
Apr 24, 8:49 PM CDT	Severe Thunderstorm Warning	HGX	Harris	26 min
Apr 24, 8:50 PM CDT	Special Marine Warning	HGX		40 min
Apr 24, 9:06 PM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Galveston, Harris	24 min
Apr 24, 9:31 PM CDT	Special Marine Warning	HGX		59 min
Apr 24, 9:34 PM CDT	Severe Thunderstorm Warning	HGX	Galveston, Harris	41 min
Apr 24, 10:17 PM CDT	Small Craft Advisory	HGX		3 days
Apr 24, 10:34 PM CDT	Flash Flood Warning	HGX	Chambers	6 hr
Apr 24, 10:41 PM CDT	Severe Thunderstorm Warning	HGX	Chambers	64 min
Apr 24, 11:21 PM CDT	Special Marine Warning	HGX		54 min
Apr 24, 11:47 PM CDT	Flash Flood Warning	HGX	Brazoria, Galveston, Harris	118 min
Apr 25, 1:22 AM CDT	River Flood Warning	HGX	Galveston, Harris	6 days
Apr 25, 1:22 AM CDT	River Flood Warning	HGX	Galveston, Harris	6 days
Apr 25, 2:33 AM CDT	Severe Thunderstorm Warning	HGX	Brazos, Burleson	42 min
Apr 25, 4:15 AM CDT	Severe Thunderstorm Warning	HGX	Brazos	30 min
Apr 25, 5:25 AM CDT	Flash Flood Warning	HGX	Brazos	95 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Every severe thunderstorm warning in 2009

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.