Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 147, NWS Houston/Galveston, TX

December 15, 2007Grimes County, Montgomery County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Dec 15, 2007, 5:42 AM CST for Grimes County, Montgomery County, Texas. It was in force for 33 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: Dec 15, 2007, 5:42 AM CST (11:42 UTC)
Expired: Dec 15, 2007, 6:15 AM CST
In force: 33 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Grimes County, TX, Montgomery County, TX

The radar

The Houston radar (KHGX), 124 km from the middle of the area, began a volume at 11:41 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, 11.7 hours before the alert went out and 247 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 474 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 263 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 Dec 15, 4:52 AM CST, 50 minutes earlier.

Area forecast discussion, Dec 15, 4:52 AM CST, 50 minutes before

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Hazardous weather outlook, Dec 15, 5:37 AM CST, 5 minutes before

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In the hours before

Special weather statement, Dec 15, 2:15 AM CST, 3 hours 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
215 AM CST SAT DEC 15 2007

TXZ163-164-176>179-195>198-151000-
HOUSTON-TRINITY-MADISON-WALKER-SAN JACINTO-POLK-BURLESON-BRAZOS-
WASHINGTON-GRIMES-
INCLUDING THE CITIES OF...CROCKETT...TRINITY...GROVETON...
MADISONVILLE...HUNTSVILLE...SHEPHERD...COLDSPRING...LIVINGSTON...
CORRIGAN...ONALASKA...CALDWELL...LAKE SOMERVILLE...
COLLEGE STATION...BRYAN...BRENHAM...NAVASOTA
215 AM CST SAT DEC 15 2007

...STRONG THUNDERSTORMS AFFECTING THE NORTHERN PORTIONS OF
SOUTHEAST TEXAS...

AN INTENSIFYING LINE OF THUNDERSTORMS EXTENDED FROM CENTERVILLE TO
BRYAN TO CALDWELL AT 2 AM. THIS BAND OF STORMS WAS MOVING EAST AT
35 MPH AND WILL REACH A LINE FROM APPLE SPRINGS TO LAKE LIVINGSTON
TO JUST WEST OF CLEVELAND BY 4 AM. FREQUENT LIGHTNING...WIND GUSTS
TO 40 MPH...HEAVY RAINFALL...AND SMALL HAIL ARE LIKELY WITH THESE
STORMS. RAINFALL AMOUNTS WILL AVERAGE 1/2 TO 1 INCH WITH ISOLATED
TOTALS OF 1 TO 2 INCHES POSSIBLE.

Special weather statement, Dec 15, 3:10 AM CST, 2 hours 32 minutes before

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Special weather statement, Dec 15, 5:19 AM CST, 23 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
Dec 14, 9:27 PM CST	Wind Advisory	HGX	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more	27 hr
Dec 15, 2:44 AM CST	Flash Flood Warning	HGX	Brazos	2 hr
Dec 15, 6:47 AM CST	Severe Thunderstorm Warning	HGX	Liberty, Polk, San Jacinto	28 min
Dec 15, 7:51 AM CST	Severe Thunderstorm Warning	HGX	Chambers, Harris, Liberty	24 min
Dec 15, 8:40 AM CST	Special Marine Warning	HGX		65 min
Dec 15, 8:57 AM CST	Special Marine Warning	HGX		2 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2007 Every severe thunderstorm warning in 2007

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.