Alert archive / Texas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 175, NWS Houston/Galveston, TX

December 25, 2012Brazoria County, Galveston County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Dec 25, 2012, 11:54 AM CST for Brazoria County, Galveston County, Texas. It was in force for 24 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 25, 2012, 11:54 AM CST (17:54 UTC)
Expired: Dec 25, 2012, 12:18 PM CST
In force: 24 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Brazoria County, TX, Galveston County, TX

The radar

The Houston radar (KHGX), 27 km from the middle of the area, began a volume at 17:57 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Dec 25, 9:17 AM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 5.9 hours before the alert went out and 210 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1505 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 500 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 265 m²/s²
0-3 km storm-relative helicity: 353 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.9

Open this sounding in Storm Lab

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 25, 11:52 AM CST, 2 minutes earlier.

Area forecast discussion, Dec 25, 11:52 AM CST, 2 minutes before

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Hazardous weather outlook, Dec 25, 7:47 AM CST, 4 hours 7 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
747 AM CST TUE DEC 25 2012

TXZ163-164-176>179-195>200-210>214-226-227-235>238-261400-
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-
747 AM CST TUE DEC 25 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE FOR A LARGE PART OF
SOUTHEAST TEXAS THIS MORNING AS A COLD FRONT MOVES INTO AREA.
THOUGH SEVERE STORMS CANNOT BE RULED OUT ANYWHERE...AT THIS TIME
IT APPEARS THE MORE FAVORABLE LOCATIONS WILL BE NORTH OF
INTERSTATE 10 BETWEEN THE HOURS OF 8 AM AND 12 PM. GIVEN THE
AMOUNT OF WIND SHEAR IN THE ATMOSPHERE...THE PRIMARY SEVERE
WEATHER THREAT WILL BE TORNADOES. DAMAGING WINDS AND HAIL WILL BE
SECONDARY THREATS. WARM AIR ALOFT MAY KEEP WIDESPREAD THUNDERSTORM
ACTIVITY FROM DEVELOPING SOUTH OF THE WARM FRONT OR SOUTH OF THE
HOUSTON AREA. MOST OF THE THUNDERSTORM ACTIVITY AND TORNADO THREAT
WILL BE CONFINED TO NEAR AND JUST SOUTH OF THE WARM FRONT OR NORTH
OF INTERSTATE 10.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

FREEZING TEMPERATURES ARE POSSIBLE ACROSS INLAND LOCATIONS
WEDNESDAY AND THURSDAY MORNINGS. OTHERWISE NO HAZARDOUS WEATHER
IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS MORNING.

GMZ330-335-350-355-370-375-261400-
GALVESTON BAY-MATAGORDA BAY-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL 20 NM TO 60 NM-
WATERS FROM FREEPORT TO THE MATAGORDA SHIP CHANNEL OUT 20 NM-
WATERS FROM HIGH ISLAND TO FREEPORT 20 TO 60 NM-
WATERS FROM HIGH ISLAND TO FREEPORT OUT 20 NM-
747 AM CST TUE DEC 25 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

STRONG ONSHORE WINDS THIS MORNING EXPECTED TO SHIFT TO THE
NORTHWEST LATER THIS AFTERNOON AND TONIGHT WITH THE PASSAGE OF A
COLD FRONT. A SMALL CRAFT ADVISORY MAY BE REQUIRED.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

A STRONG GUSTY NORTHWEST WINDS ON WEDNESDAY SHOULD DECREASE LATE
WEDNESDAY NIGHT AS HIGH PRESSURE SETTLES OVER THE AREA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS MORNING.

In the hours before

Local storm report, Dec 25, 10:36 AM CST, 1 hour 18 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1036 AM CST TUE DEC 25 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0910 AM     TORNADO          9 NW CROCKETT           31.41N  95.56W
12/25/2012                   HOUSTON            TX   EMERGENCY MNGR

            POSSIBLE TORNADO REPORTED NEAR HOUSTON COUNTY LAKE

0922 AM     TORNADO          13 SE CROCKETT          31.18N  95.30W
12/25/2012                   HOUSTON            TX   EMERGENCY MNGR

            PUBLIC REPORT OF TORNADO DAMAGE ON 287 WITH A DESTROYED
            BUILDING. LOST SECTION OF ROOF ON BANK.

0922 AM     TORNADO          15 SE CROCKETT          31.16N  95.28W
12/25/2012                   TRINITY            TX   TRAINED SPOTTER

            TRAINED SPOTTER REPORTED TORNADO PASSED THROUGH PASTURE
            BEHIND HOME.

0930 AM     TSTM WND GST     LOVELADY                31.13N  95.45W
12/25/2012  E80 MPH          HOUSTON            TX   FIRE DEPT/RESCUE

            LOVELADY FIRECHIEF REPORT WIND GUST OF 80 MPH

&&

EVENT NUMBER HGX1200061 HGX1200059 HGX1200060 HGX1200062

BH

Local storm report, Dec 25, 10:54 AM CST, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1054 AM CST TUE DEC 25 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1047 AM     TSTM WND DMG     8 SE CLEVELAND          30.26N  94.98W
12/25/2012                   LIBERTY            TX   TRAINED SPOTTER

            LARGE PINE TREE DOWN 8 MI SE OF CLEVELAND

&&

EVENT NUMBER HGX1200063

BH

Local storm report, Dec 25, 10:56 AM CST, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1056 AM CST TUE DEC 25 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 AM     TSTM WND DMG     MADISONVILLE            30.95N  95.91W
12/25/2012                   MADISON            TX   EMERGENCY MNGR

            MULTIPLE REPORTS OF TREES DOWN. ROOFS LOST ON METAL AND
            WOOD BUILDINGS AT HWY 21.

&&

EVENT NUMBER HGX1200064

BH

Special weather statement, Dec 25, 11:07 AM CST, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1107 AM CST TUE DEC 25 2012

TXZ200-213-214-227-237-238-251800-
CHAMBERS TX-BRAZORIA TX-LIBERTY TX-GALVESTON TX-FORT BEND TX-
HARRIS TX-
1107 AM CST TUE DEC 25 2012

...SIGNIFICANT WEATHER ADVISORY FOR CHAMBERS...NORTHEASTERN
BRAZORIA...SOUTHEASTERN LIBERTY...GALVESTON...SOUTHEASTERN FORT BEND
AND SOUTHEASTERN HARRIS COUNTIES UNTIL 1200 PM CST...

AT 1103 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A LINE OF STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM SOUTH
HOUSTON TO 8 MILES NORTH OF WEST COLUMBIA...OR ALONG A LINE
EXTENDING FROM GALENA PARK TO 15 MILES NORTH OF SWEENY...AND MOVING
EAST AT 45 MPH.

HAIL UP TO THE SIZE OF PEAS AND WIND GUSTS UP TO 40 MPH WILL BE
POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
PASADENA...BAYTOWN...LEAGUE CITY...TEXAS CITY...PEARLAND...LA
PORTE...FRIENDSWOOD...DEER PARK...ALVIN...DICKINSON...SOUTH
HOUSTON...LA MARQUE...SANTA FE...HITCHCOCK...WEBSTER...NASSAU BAY...
TAYLOR LAKE VILLAGE...FRESNO...EL LAGO AND MANVEL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO
AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CST TUESDAY AFTERNOON
FOR SOUTHEASTERN TEXAS.

LAT...LON 2957 9436 2937 9473 2936 9477 2948 9468
      2954 9479 2976 9469 2965 9501 2964 9502
      2963 9495 2954 9502 2937 9489 2933 9473
      2925 9486 2932 9494 2924 9502 2920 9577
      2973 9528 2988 9436
TIME...MOT...LOC 1703Z 258DEG 40KT 2969 9529 2926 9569

!KP!

Special weather statement, Dec 25, 11:35 AM CST, 19 minutes before

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Local storm report, Dec 25, 11:50 AM CST, 4 minutes before

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The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 25, 12:47 AM CST	Special Weather Statement	HGX	Montgomery	28 min
Dec 25, 1:09 AM CST	Special Weather Statement	HGX	Grimes, San Jacinto, Walker	36 min
Dec 25, 1:36 AM CST	Special Weather Statement	HGX	Polk	39 min
Dec 25, 1:48 AM CST	Special Weather Statement	HGX	Trinity	27 min
Dec 25, 2:12 AM CST	Special Weather Statement	HGX	Houston, Polk, Trinity	48 min
Dec 25, 2:54 AM CST	Special Weather Statement	HGX	Houston	21 min
Dec 25, 8:13 AM CST	Special Weather Statement	HGX	Houston	47 min
Dec 25, 8:32 AM CST	Severe Thunderstorm Warning	HGX	Houston	43 min
Dec 25, 8:42 AM CST	Tornado Warning	HGX	Houston	48 min
Dec 25, 9:04 AM CST	Tornado Warning	HGX	Houston, Polk, Trinity	41 min
Dec 25, 9:17 AM CST	Severe Thunderstorm Warning	HGX	Houston, Madison	43 min
Dec 25, 9:45 AM CST	Severe Thunderstorm Warning	HGX	Polk, Trinity	30 min
Dec 25, 9:56 AM CST	Special Weather Statement	HGX	San Jacinto	49 min
Dec 25, 9:57 AM CST	Tornado Warning	HGX	Houston, Trinity	22 min
Dec 25, 10:02 AM CST	Special Weather Statement	HGX	San Jacinto	43 min
Dec 25, 10:15 AM CST	Severe Thunderstorm Warning	HGX	Harris, Liberty, Montgomery, Polk, San Jacinto	30 min
Dec 25, 10:18 AM CST	Severe Thunderstorm Warning	HGX	Polk, San Jacinto, Trinity	42 min
Dec 25, 10:38 AM CST	Wind Advisory	HGX	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more	16 hr
Dec 25, 10:39 AM CST	Tornado Warning	HGX	Harris, Liberty, Montgomery	36 min
Dec 25, 10:42 AM CST	Severe Thunderstorm Warning	HGX	Liberty, Montgomery, Polk, San Jacinto	17 min
Dec 25, 11:01 AM CST	Severe Thunderstorm Warning	HGX	Chambers, Harris, Liberty	44 min
Dec 25, 11:07 AM CST	Special Weather Statement	HGX	Chambers	53 min
Dec 25, 11:08 AM CST	Special Marine Warning	HGX		82 min
Dec 25, 11:12 AM CST	Tornado Warning	HGX	Chambers, Harris, Liberty	48 min
Dec 25, 11:18 AM CST	Severe Thunderstorm Warning	HGX	Brazoria, Galveston, Harris	42 min
Dec 25, 11:23 AM CST	Severe Thunderstorm Warning	HGX	Chambers, Harris, Liberty	55 min
Dec 25, 11:24 AM CST	Special Marine Warning	HGX		81 min
Dec 25, 11:35 AM CST	Special Weather Statement	HGX	Brazoria, Matagorda	70 min
Dec 25, 12:15 PM CST	Special Marine Warning	HGX		2 hr
Dec 25, 12:46 PM CST	Special Marine Warning	HGX		59 min

Nearby

Severe Thunderstorm Warnings in Texas, 2012 Every severe thunderstorm warning in 2012

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.