Alert archive / Texas / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 107, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Sep 29, 2011, 3:25 PM CDT for Montgomery County, San Jacinto County, Texas. It was in force for 65 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
- Sep 29, 2011, 3:25 PM CDT (20:25 UTC)
- Expired
- Sep 29, 2011, 4:30 PM CDT
- In force
- 65 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Storm-based polygon
Counties Montgomery County, TX, San Jacinto County, TX
The radar
The Houston radar (KHGX), 110 km from the middle of the area, began a volume at 20:27 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, 8.4 hours before the alert went out and 208 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
- 744 J/kg
- Mixed-layer CIN
- -183 J/kg
- Mixed-layer LCL
- 1451 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 108 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.9
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 Sep 29, 12:39 PM CDT, 2 hours 46 minutes earlier.
Area forecast discussion, Sep 29, 12:39 PM CDT, 2 hours 46 minutes before
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</html>Hazardous weather outlook, Sep 29, 3:15 PM CDT, 10 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 315 PM CDT THU SEP 29 2011 TXZ163-164-176>179-195>200-210>214-226-227-235>238-302015- 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- 315 PM CDT THU SEP 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS HAVE DEVELOPED ALONG AN OLD OUTFLOW BOUNDARY DRAPED ACROSS THE AREA. THESE STORMS WILL LIKELY CONTINUE THROUGH THE EVENING HOURS UNTIL TEMPERATURES SUBSIDE. SOME OF THE STORMS COULD BRIEFLY BECOME SEVERE...WITH DAMAGING WINDS AND HAIL THE PRIMARY THREAT. A FRONTAL BOUNDARY IS EXPECTED TO PUSH INTO THE NORTHERN HALF OF SOUTHEAST TEXAS LATE TONIGHT AND COULD PROVIDE ANOTHER FOCUS FOR SHOWER AND THUNDERSTORM DEVELOPMENT ALONG AND TO THE SOUTH OF THE BOUNDARY. HOWEVER...CHANCES OF SEVERE STORMS ARE FAIRLY LOW WITH THE FRONT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON OR EVENING.
In the hours before
Special weather statement, Sep 29, 2:35 PM CDT, 50 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
235 PM CDT THU SEP 29 2011
TXZ210-211-292015-
AUSTIN-COLORADO-
235 PM CDT THU SEP 29 2011
...SIGNIFICANT WEATHER ADVISORY...
AT 231 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM NORTHEASTERN FAYETTE
COUNTY TO WEST CENTRAL AUSTIN COUNTY...MOVING SOUTHEAST AT 10 MPH.
WINDS GREATER THAN 40 MPH...OCCASIONAL CLOUD TO GROUND LIGHTNING...
AND BRIEF MODERATE DOWNPOURS ARE POSSIBLE WITH THESE STORMS.
LOCATIONS IN THE PATH OF THESE STORMS INCLUDE...SHELBY...NEW ULM...
INDUSTRY AND FRELSBURG.
GUSTY WINDS MAY CAUSE UNSECURED SMALL OBJECTS SUCH AS TRASH CANS TO
BLOW AROUND. IF YOU ARE OUTDOORS AND HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING. SEEK SHELTER IN A STURDY STRUCTURE
OR NON-CONVERTIBLE AUTOMOBILE UNTIL THESE STORMS HAVE PASSED.
LAT...LON 2996 9658 3002 9662 3004 9662 2994 9638
2962 9623 2980 9673
TIME...MOT...LOC 1935Z 334DEG 10KT 3001 9669 2992 9648Special weather statement, Sep 29, 2:57 PM CDT, 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
257 PM CDT THU SEP 29 2011
TXZ178-292100-
SAN JACINTO-
257 PM CDT THU SEP 29 2011
...STRONG STORM IN SAN JACINTO COUNTY...
AT 248 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 8 MILES NORTHWEST OF COLDSPRING...MOVING
SOUTHEAST AT 15 MPH.
ONE HALF INCH DIAMETER HAIL...WINDS GREATER THAN 40 MPH...ARE
POSSIBLE WITH THIS STORM.
LOCATIONS IN THE PATH OF THIS STORM INCLUDE...COLDSPRING.
GUSTY WINDS MAY CAUSE UNSECURED SMALL OBJECTS SUCH AS TRASH CANS TO
BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE OR NON-CONVERTIBLE
AUTOMOBILE UNTIL THIS STORM HAS PASSED.
LAT...LON 3034 9521 3039 9525 3040 9530 3068 9533
3071 9517 3071 9512 3067 9512 3067 9509
3059 9503 3058 9503 3058 9502 3047 9493
TIME...MOT...LOC 1956Z 331DEG 12KT 3061 9520The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 29, 5:13 AM CDT | Severe Thunderstorm Warning | HGX | Chambers, Galveston | 47 min |
| Sep 29, 5:15 AM CDT | Special Marine Warning | HGX | 60 min | |
| Sep 29, 5:28 AM CDT | Special Marine Warning | HGX | 2 hr | |
| Sep 29, 6:08 AM CDT | Special Marine Warning | HGX | 97 min | |
| Sep 29, 7:34 AM CDT | Special Marine Warning | HGX | 116 min | |
| Sep 29, 2:35 PM CDT | Special Weather Statement | HGX | Austin | 40 min |
| Sep 29, 2:53 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado | 37 min |
| Sep 29, 2:57 PM CDT | Special Weather Statement | HGX | San Jacinto | 63 min |
| Sep 29, 3:31 PM CDT | Special Weather Statement | HGX | Harris | 59 min |
| Sep 29, 3:34 PM CDT | Special Weather Statement | HGX | Colorado | 56 min |
| Sep 29, 3:47 PM CDT | Special Weather Statement | HGX | Montgomery | 58 min |
| Sep 29, 3:53 PM CDT | Severe Thunderstorm Warning | HGX | Liberty | 52 min |
| Sep 29, 3:56 PM CDT | Severe Thunderstorm Warning | HGX | Fort Bend, Harris | 49 min |
| Sep 29, 4:11 PM CDT | Severe Thunderstorm Warning | HGX | Harris, Montgomery | 49 min |
| Sep 29, 4:23 PM CDT | Severe Thunderstorm Warning | HGX | Harris, Montgomery, Waller | 37 min |
| Sep 29, 4:32 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend, Harris | 28 min |
| Sep 29, 4:38 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Grimes, Harris, Waller, Washington | 52 min |
| Sep 29, 4:41 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Harris, Liberty | 49 min |
| Sep 29, 4:42 PM CDT | Special Marine Warning | HGX | 93 min | |
| Sep 29, 5:00 PM CDT | Severe Thunderstorm Warning | HGX | Brazoria, Fort Bend, Harris | 45 min |
| Sep 29, 5:03 PM CDT | Severe Thunderstorm Warning | HGX | Fort Bend, Harris, Montgomery, Waller | 42 min |
| Sep 29, 5:28 PM CDT | Severe Thunderstorm Warning | HGX | Chambers, Galveston, Harris, Liberty | 27 min |
| Sep 29, 5:34 PM CDT | Special Weather Statement | HGX | Austin | 41 min |
| Sep 29, 5:41 PM CDT | Severe Thunderstorm Warning | HGX | Austin, Colorado, Fort Bend, Harris, Waller, Wharton | 40 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2011Every severe thunderstorm warning in 2011
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.