Alert archive / Texas / Severe Thunderstorm Warnings in 2004
Severe Thunderstorm Warning 177, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Aug 11, 2004, 7:55 PM CDT for Brazoria County, Matagorda 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
- Aug 11, 2004, 7:55 PM CDT (00:55 UTC)
- Expired
- Aug 11, 2004, 9:00 PM CDT
- In force
- 65 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Counties, with a storm outline in the text
Counties Brazoria County, TX, Matagorda County, TX
The radar
The Houston radar (KHGX), 83 km from the middle of the area, began a volume at 00:56 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
Corpus Christi, TX (KCRP), launched 00:00Z, 0.9 hours before the alert went out and 211 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
- 2080 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 1197 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 42 m²/s²
- 0-3 km storm-relative helicity
- 68 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 2.4
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 11, 2:25 PM CDT, 5 hours 30 minutes earlier.
Area forecast discussion, Aug 11, 2:25 PM CDT, 5 hours 30 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 225 PM CDT WED AUG 11 2004 DISCUSSION... COLD FRONT IS APPROACHING THE OUTFLOW BOUNDARY NW OF THE AREA AND SCT STRONG/SVR TSTMS ARE THE RESULT. WE EXPECT SHWRS AND TSTMS TO BECOME MORE NUMEROUS ALONG THE BOUNDARY AS THE AFTERNOON PROGRESSES. WE ALSO EXPECT SCT SHWRS AND TSTMS TO CONTINUE TO DEVELOP ALONG THE SEA BREEZE. MAIN ISSUE IS PRECIP COVERAGE AND SVR TSTM POTENTIAL THIS EVENING ACROSS SE TX. BEST CHC APPEARS TO BE ACROSS THE NW ZONES AS THE BOUNDARY WILL BE IN THIS ZONE LATE THIS AFT/EARLY EVE WITH HEATING STILL OCCURRING. PRECIP COVERAGE BECOMES MORE QUESTIONABLE FURTHER SOUTH AS BOUNDARY MOVES THROUGH LATER IN THE EVENING. HOWEVER...BASED ON THE SOUTHEAST FLOW THAT IS DEVELOPING AHEAD OF THE BOUNDARY OVER SE TX...THINK THAT THE LOW-LEVEL CONVERGENCE WILL BE SUFFICIENT FOR CONTINUED TSTM DEVELOPMENT. WILL RAISE POPS TO LIKELY AREAWIDE TONIGHT. WILL MAINTAIN SVR TSTM POSSIBILITY...WITH THE MAIN THREATS DAMAGING WINDS AND LARGE HAIL. WILL DROP POPS TOMORROW WITH VERY DRY AIR PUSHING IN BEHIND THE FRONT. THIS UNSEASONABLY COOL AIRMASS WILL BE QUITE A CHANGE FOR THIS TIME OF YEAR. IN FACT...AM FORECASTING AT OR BELOW RECORD LOWS FOR INLAND LOCATIONS ON SAT MORNING. FOR THE MARINE AREA...WE EXPECT WINDS TO INCREASE TO CAUTION LEVELS ON THU BEHIND THE FRONT DUE TO THE RELATIVELY COOL AIR OVER WARM WATER AND THE TIGHTENING PRESSURE GRADIENT. && .HGX WATCHES/WARNINGS/ADVISORIES... NONE. && .PRELIMINARY POINT TEMPS/POPS... COLLEGE STATION (CLL) 68 88 63 88 61/ 70 00 00 00 HOUSTON(IAH) 70 89 64 88 63/ 60 05 00 00 GALVESTON (GLS) 76 87 72 86 72/ 60 10 00 00 && 33/43
Hazardous weather outlook, Aug 11, 10:47 AM CDT, 9 hours 8 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX 1047 AM CDT WED AUG 11 2004 TXZ163-164-176>179-195>200-210>214-226-227-235>238-121200- 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- 1047 AM CDT WED AUG 11 2004 ...SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS NORTHWEST AREAS THIS AFTERNOON AND ACROSS ALL OF SOUTHEAST TEXAS THIS EVENING... .DAY ONE...TODAY AND TONIGHT. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG A COOL FRONT NORTHWEST OF SOUTHEAST THIS AFTERNOON. AS THE FRONT MOVES SOUTHEAST...THUNDERSTORMS ARE EXPECTED TO MOVE INTO NORTHWEST PORTIONS OF THE AREA. BECAUSE THERE IS A LAYER OF DRY AIR ABOVE A LOW- LEVEL MOIST LAYER IN THE ATMOSPHERE...STRONG AND DAMAGING WINDS WILL BE A POSSIBILITY WITH ANY STRONG THUNDERSTORMS THAT DEVELOP. AS THE FRONT MOVES SOUTH THIS EVENING...THE SEVERE THUNDERSTORM THREAT WILL ALSO SHIFT SOUTH...AND THEREFORE INCLUDE ALL OF SOUTHEAST TEXAS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. NO HAZARDOUS WEATHER IS EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON MAINLY FOR THE AREA ALONG AND NORTH OF A BRENHAM...HUNTSVILLE...GROVETON LINE. SPOTTER ACTIVATION MAY BE NEEDED ACROSS ALL OF SOUTHEAST TEXAS TONIGHT.
In the hours before
Local storm report, Aug 11, 5:35 PM CDT, 2 hours 20 minutes before
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</html>Local storm report, Aug 11, 5:57 PM CDT, 1 hour 58 minutes before
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</html>Local storm report, Aug 11, 6:53 PM CDT, 1 hour 2 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 |
|---|---|---|---|---|
| Aug 11, 7:20 PM CDT | Severe Thunderstorm Warning | HGX | Fort Bend, Wharton | 55 min |
| Aug 11, 7:30 PM CDT | Severe Thunderstorm Warning | HGX | Jackson | 60 min |
| Aug 11, 7:55 PM CDT | Special Marine Warning | HGX | 2 hr | |
| Aug 11, 8:31 PM CDT | Severe Thunderstorm Warning | HGX | Jackson | 29 min |
Nearby
Severe Thunderstorm Warnings in Texas, 2004Every severe thunderstorm warning in 2004
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.