Alert archive / Texas / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 7, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Feb 10, 2009, 11:07 PM CST for Brazos County, Texas. It was in force for 23 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 10, 2009, 11:07 PM CST (05:07 UTC)
- Expired
- Feb 10, 2009, 11:30 PM CST
- In force
- 23 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 05:08 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Feb 10, 9:30 PM CST | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 5.1 hours before the alert went out and 259 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.
- Mixed-layer CAPE
- 1515 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 763 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 302 m²/s²
- 0-3 km storm-relative helicity
- 287 m²/s²
- Significant tornado parameter
- 2.9
- Supercell composite
- 10.9
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 10, 10:07 PM CST, 1 hour earlier.
Area forecast discussion, Feb 10, 10:07 PM CST, 1 hour before
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</html>Hazardous weather outlook, Feb 10, 3:28 PM CST, 7 hours 39 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 328 PM CST TUE FEB 10 2009 GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226- 227-235>238-110600- 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- 328 PM CST TUE FEB 10 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT THE PRESSURE GRADIENT ACROSS THE REGION WILL REMAIN TIGHT RESULTING IN BRISK AND GUSTY SOUTHERLY WINDS DURING THE EARLY EVENING HOURS. EXPECT WINDS OF 20 TO 25 MILES AN HOUR WITH WIND GUSTS TO 35 MPH. A WIND ADVISORY HAS BEEN ISSUED THROUGH 9 PM FOR AREAS WEST OF A MADISONVILLE TO FREEPORT LINE. A STRONG UPPER LEVEL DISTURBANCE AND ASSOCIATED PACIFIC COLD FRONT WILL CROSS THE AREA TONIGHT. SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP BEGINNING LATE THIS AFTERNOON...EVOLVING INTO A SQUALL LINE THAT WILL AFFECT PORTIONS OF SOUTHEAST TEXAS AFTER MIDNIGHT. DUE TO STRONG SHEAR IN THE LOW LEVELS OF THE ATMOSPHERE THE POTENTIAL EXISTS FOR SOME OF THE STORMS TO BECOME SEVERE. THE PRIMARY RISK AREA WILL BE TO THE NORTH OF A LINE FROM BRENHAM TO HOUSTON TO GALVESTON. THE PRIMARY SEVERE WEATHER THREATS WILL BE DAMAGING WINDS AND HAIL...WITH THE POTENTIAL FOR ISOLATED TORNADOES. A CAPPING INVERSION MAY LIMIT THE SOUTHERN EXTENT OF THE SQUALL LINE. .DAY TWO...WEDNESDAY... A FIRE WEATHER WATCH WILL BE IN EFFECT FOR JACKSON AND MATAGORDA COUNTIES...FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING. THE COMBINATION OF DRY FUELS AND VERY LOW HUMIDITY LEVELS WILL SET THE STAGE FOR THE POSSIBILITY OF RAPID FIRE GROWTH IN THE WAKE OF A COLD FRONT. RELATIVE HUMIDITY VALUES ARE EXPECTED TO FALL BELOW 20 PERCENT AROUND MID MORNING AND PERSIST BELOW 20 PERCENT UNTIL AROUND SUNSET. .DAYS THREE THROUGH SEVEN...THURSDAY THROUGH MONDAY HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... EMERGENCY MANAGERS AND STORM SPOTTERS SHOULD PREPARE FOR ACTIVATION LATER TONIGHT.
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 10, 11:34 PM CST | Severe Thunderstorm Warning | HGX | Austin, Colorado, Washington | 41 min |
| Feb 11, 12:08 AM CST | Severe Thunderstorm Warning | HGX | Houston, Trinity | 37 min |
| Feb 11, 12:16 AM CST | Severe Thunderstorm Warning | HGX | Harris, Montgomery, Waller | 32 min |
| Feb 11, 12:46 AM CST | Severe Thunderstorm Warning | HGX | Harris, Liberty, Montgomery, San Jacinto | 44 min |
| Feb 11, 12:51 AM CST | Severe Thunderstorm Warning | HGX | Polk, San Jacinto | 39 min |
| Feb 11, 1:03 AM CST | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend, Harris | 42 min |
| Feb 11, 1:09 AM CST | Special Marine Warning | HGX | 111 min | |
| Feb 11, 1:21 AM CST | Severe Thunderstorm Warning | HGX | Harris, Liberty, Montgomery | 39 min |
| Feb 11, 1:31 AM CST | Special Marine Warning | HGX | 90 min | |
| Feb 11, 4:15 AM CST | Red Flag Warning | HGX | Austin, Brazoria, Brazos, Burleson, Colorado, Fort Bend and 7 more | 13 hr |
Nearby
Severe Thunderstorm Warnings in Texas, 2009Every 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.