Alert archive / Texas / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 170, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Aug 21, 2009, 3:54 PM CDT for Chambers County, Harris County, Liberty County, Texas. It was in force for 51 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
- Aug 21, 2009, 3:54 PM CDT (20:54 UTC)
- Expired
- Aug 21, 2009, 4:45 PM CDT
- In force
- 51 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
Counties Chambers County, TX, Harris County, TX, Liberty County, TX
The radar
The Houston radar (KHGX), 50 km from the middle of the area, began a volume at 20:53 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.
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 Aug 21, 3:48 PM CDT, 6 minutes earlier.
Area forecast discussion, Aug 21, 3:48 PM CDT, 6 minutes before
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</html>Hazardous weather outlook, Aug 21, 6:41 AM CDT, 9 hours 13 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 641 AM CDT FRI AUG 21 2009 TXZ163-164-176>179-195>200-210>214-226-227-235>238-221145- 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- 641 AM CDT FRI AUG 21 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...TODAY AND TONIGHT HOT WEATHER ON TAP TODAY WITH HEAT INDEX READINGS OF 104 TO 111 BLANKETING THE AREA THIS AFTERNOON. A HEAT ADVISORY IS IN EFFECT FOR NEARLY ALL OF SOUTHEAST TEXAS. THUNDERSTORMS WILL DEVELOP IN THIS VERY UNSTABLE ATMOSPHERE THIS AFTERNOON AND MOVE SLOWLY SOUTH. SOME THUNDERSTORMS COULD BECOME SEVERE WITH DAMAGING WINDS FROM MICROBURSTS DURING THE LATE AFTERNOON HOURS. STORMS MAY DEVELOP ALONG THE SEABREEZE AS WELL AND EVENTUALLY COLLIDE WITH OUTFLOW AND STORMS MOVING DOWN FROM THE NORTH. WHERE THESE BOUNDARIES COLLIDE HEAVY RAINFALL WILL BE POSSIBLE WITH ISOLATED TOTALS OF 2 TO 3 INCHES. THE SEVERE AND HEAVY RAIN THREAT SHOULD BE MAINLY NORTH OF BRENHAM TO HOUSTON TO LIBERTY LINE. .DAYS TWO THROUGH SEVEN... NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON.
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 4:28 AM CDT | Heat Advisory | HGX | Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 14 more | 40 hr |
| Aug 21, 3:31 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Liberty | 29 min |
| Aug 21, 4:45 PM CDT | Special Marine Warning | HGX | 60 min | |
| Aug 21, 5:16 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Galveston | 44 min |
| Aug 21, 5:57 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend, Galveston | 35 min |
| Aug 21, 6:00 PM CDT | Severe Thunderstorm Warning | HGX | Harris | 45 min |
| Aug 21, 6:24 PM CDT | Areal Flood Advisory | HGX | Harris | 111 min |
| Aug 21, 6:29 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend, Wharton | 46 min |
| Aug 21, 6:43 PM CDT | Severe Thunderstorm Warning | HGX | Harris | 47 min |
| Aug 21, 6:45 PM CDT | Severe Thunderstorm Warning | HGX | Montgomery, San Jacinto, Walker | 45 min |
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; radar from the NEXRAD Level II archive.