Alert archive / Texas / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 152, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Dec 20, 2007, 3:12 AM CST for Polk County, Trinity County, Texas. It was in force for 48 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 20, 2007, 3:12 AM CST (09:12 UTC)
- Expired
- Dec 20, 2007, 4:00 AM CST
- In force
- 48 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
Counties Polk County, TX, Trinity County, TX
The radar
The Houston radar (KHGX), 164 km from the middle of the area, began a volume at 09:12 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, 9.2 hours before the alert went out and 194 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
- 276 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 821 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 162 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
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 Dec 19, 11:44 PM CST, 3 hours 28 minutes earlier.
Area forecast discussion, Dec 19, 11:44 PM CST, 3 hours 28 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 839 AM CST WED DEC 19 2007 TXZ163-164-176>179-195>200-210>214-226-227-235>238-201445- 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- 839 AM CST WED DEC 19 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. ...SLIGHT RISK FOR SEVERE THUNDERSTORMS OVERNIGHT TONIGHT... .DAY ONE...TODAY AND TONIGHT INCREASING MOISTURE LEVELS AND INSTABILITY IN COMBINATION WITH A FAST MOVING UPPER LEVEL DISTURBANCE WILL RESULT IN THE DEVELOPMENT OF THUNDERSTORMS OVER THE REGION TONIGHT ESPECIALLY OVER THE NORTHERN PORTIONS. SOME OF THE STORMS MAY BECOME SEVERE MAINLY FROM MIDNIGHT TO AROUND SUNRISE. THE MAIN THREAT WILL BE HAIL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY AN APPROACHING UPPER LEVEL DISTURBANCE AND A STRONG COLD FRONT WILL MOVE ACROSS THE REGION ON SATURDAY. EXPECT SCATTERED SHOWERS AND THUNDERSTORMS WITH THIS FRONT. THE FRONT IS EXPECTED TO MOVE OFFSHORE BY SATURDAY AFTERNOON. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED TONIGHT AND EARLY THURSDAY MORNING.
In the hours before
Special weather statement, Dec 19, 11:33 PM CST, 3 hours 39 minutes before
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</html>The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 19, 11:00 PM CST | Severe Thunderstorm Warning | HGX | Houston, Trinity | 15 min |
| Dec 19, 11:14 PM CST | Severe Thunderstorm Warning | HGX | Polk | 16 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2007Every 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.