Alert archive / Texas / Severe Thunderstorm Warnings in 2006
Severe Thunderstorm Warning 7, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Mar 20, 2006, 9:37 AM CST for Grimes County, Waller 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
- Mar 20, 2006, 9:37 AM CST (15:37 UTC)
- Expired
- Mar 20, 2006, 10:00 AM CST
- In force
- 23 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Counties, with a storm outline in the text
Counties Grimes County, TX, Waller County, TX
The radar
The Houston radar (KHGX), 125 km from the middle of the area, began a volume at 15:41 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 12:00Z, 3.6 hours before the alert went out and 268 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
- 175 J/kg
- Mixed-layer CIN
- -190 J/kg
- Mixed-layer LCL
- 896 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 216 m²/s²
- 0-3 km storm-relative helicity
- 283 m²/s²
- Significant tornado parameter
- 0.0
- 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 Mar 20, 7:48 AM CST, 1 hour 49 minutes earlier.
Area forecast discussion, Mar 20, 7:48 AM CST, 1 hour 49 minutes before
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</html>Hazardous weather outlook, Mar 20, 6:37 AM CST, 3 hours before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 637 AM CST MON MAR 20 2006 TXZ163-164-176>179-195>200-210>214-226-227-235>238-211245- 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- 637 AM CST MON MAR 20 2006 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT SCATTERED SHOWERS AND THUNDERSTORMS WILL COME TO AN END THIS MORNING. A FEW OF THE STORMS COULD PRODUCE LARGE HAIL OR AN ISOLATED TORNADO BEFORE 10 AM OTHERWISE NO HAZARDOUS WEATHER IS EXPECTED. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED.
In the hours before
Special weather statement, Mar 20, 4:03 AM CST, 5 hours 34 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
403 AM CST MON MAR 20 2006
TXZ195>198-210>212-201030-
AUSTIN-BRAZOS-BURLESON-COLORADO-GRIMES-WALLER-WASHINGTON-
403 AM CST MON MAR 20 2006
...TORNADO WATCH ALLOWED TO EXPIRE AT 4 AM...
THE TORNADO WATCH PREVIOUSLY IN EFFECT FOR AUSTIN...BRAZOS...
BURLESON...COLORADO...GRIMES...WALLER AND WASHINGTON COUNTIES WAS
ALLOWED TO EXPIRE AT 4 AM. NO REPORTS OF HAZARDOUS WEATHER HAVE BEEN
RECEIVED.The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 20, 4:14 AM CST | Tornado Warning | HGX | Montgomery | 31 min |
| Mar 20, 4:52 AM CST | Tornado Warning | HGX | San Jacinto | 8 min |
| Mar 20, 5:05 AM CST | Special Marine Warning | HGX | 55 min | |
| Mar 20, 5:56 AM CST | Special Marine Warning | HGX | 64 min | |
| Mar 20, 7:14 AM CST | Severe Thunderstorm Warning | HGX | Harris, Montgomery | 31 min |
| Mar 20, 10:39 AM CST | Severe Thunderstorm Warning | HGX | Harris | 36 min |
| Mar 20, 10:59 AM CST | Severe Thunderstorm Warning | HGX | Montgomery | 31 min |
| Mar 20, 11:15 AM CST | Severe Thunderstorm Warning | HGX | Liberty | 30 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2006Every severe thunderstorm warning in 2006
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.