Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 14, NWS Houston/Galveston, TX

April 4, 20117 counties in Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 4, 2011, 10:52 AM CDT for 7 counties in Texas. It was in force for 16 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: Apr 4, 2011, 10:52 AM CDT (15:52 UTC)
Expired: Apr 4, 2011, 11:08 AM CDT
In force: 16 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Austin County, TX, Grimes County, TX, Harris County, TX, Montgomery County, TX, Walker County, TX, Waller County, TX, Washington County, TX

The radar

The Houston radar (KHGX), 113 km from the middle of the area, began a volume at 15:52 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
Apr 4, 7:44 AM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.9 hours before the alert went out and 257 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: 1440 J/kg
Mixed-layer CIN: -231 J/kg
Mixed-layer LCL: 637 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Apr 4, 10:24 AM CDT, 28 minutes earlier.

Area forecast discussion, Apr 4, 10:24 AM CDT, 28 minutes before

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Hazardous weather outlook, Apr 4, 9:31 AM CDT, 1 hour 21 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
931 AM CDT MON APR 4 2011

GMZ330-335-350-355-370-375-TXZ163-164-176>179-195>200-210>214-226-
227-235>238-051100-
AUSTIN-BRAZORIA-BRAZOS-BURLESON-CHAMBERS-COLORADO-FORT BEND-
GALVESTON-GALVESTON BAY-GRIMES-HARRIS-HOUSTON-JACKSON-LIBERTY-
MADISON-MATAGORDA-MATAGORDA BAY-MONTGOMERY-POLK-SAN JACINTO-
TRINITY-WALKER-WALLER-WASHINGTON-
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-WHARTON-
931 AM CDT MON APR 4 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

A COLD FRONT WILL MOVE THROUGH SOUTHEAST TEXAS TODAY. EXPECT THE TAIL
END OF A BROKEN LINE OF SHOWERS AND THUNDERSTORMS TO MOVE ACROSS THE
REGION ALONG AND AHEAD OF THE FRONT. AT THIS TIME...THE THREAT OF ANY
STRONG OR SEVERE THUNDERSTORMS IS EXPECTED TO BE GENERALLY NORTH OF
THE INTERSTATE 10...WITH THE GREATEST RISK WELL NORTH THROUGH NORTHEAST
OF THE HOUSTON AREA. STRONG WINDS AND SMALL HAIL ARE EXPECTED TO BE
THE PRIMARY SEVERE WEATHER THREAT.

NORTH WINDS BETWEEN 20 AND 35 MPH CAN BE EXPECTED IN THE WAKE OF THE
FRONT. A WIND ADVISORY AND A SMALL CRAFT ADVISORY ARE IN EFFECT. THESE
HIGHER WINDS COMBINED WITH FALLING HUMIDITIES WILL POSE AN ELEVATED
FIRE WEATHER THREAT THIS AFTERNOON.

.DAY TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS MORNING OR EARLY THIS
AFTERNOON FOR A SHORT PERIOD OF TIME.

In the hours before

Special weather statement, Apr 4, 8:12 AM CDT, 2 hours 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
812 AM CDT MON APR 4 2011

TXZ163-176-177-195>198-041415-
BRAZOS-BURLESON-GRIMES-HOUSTON-MADISON-WALKER-WASHINGTON-
812 AM CDT MON APR 4 2011

...SIGNIFICANT WEATHER ADVISORY...

AT 810 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
BROKEN LINE OF STRONG TO SEVERE THUNDERSTORMS ALONG A LINE EXTENDING
FROM TYLER TO FAIRFIELD TO THE THORNDALE AREA...MOVING EAST AT 35 TO
40 MPH.

NICKEL SIZE HAIL AND WINDS UP TO 50 MPH ARE POSSIBLE WITH THESE
STORMS.

LOCATIONS IN THE PATH OF THESE STORMS INCLUDE...WELLBORN...WECHES...
QUARRY...NORTH ZULCH...MILLICAN...KURTEN...INDEPENDENCE...IOLA...
CHRIESMAN...CARLOS...BEDIAS...AUSTONIO...WIXON VALLEY...SNOOK...
NORMANGEE...MIDWAY...MADISONVILLE...LOVELADY...LATEXO...KENNARD...
CROCKETT...COLLEGE STATION...CALDWELL...BURTON AND BRYAN.

GUSTY WINDS MAY CAUSE SMALL TREE BRANCHES TO BE BROKEN...AND
UNSECURED OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE
OR NON-CONVERTIBLE AUTOMOBILE UNTIL THESE STORMS HAVE PASSED.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 300 PM CDT FOR THE
WARNED AREA.

LAT...LON 3158 9514 3148 9510 3144 9499 3006 9655
      3005 9663 3015 9667 3016 9680 3030 9666
      3033 9676 3057 9697 3074 9663 3071 9656
      3075 9647 3093 9635 3108 9606 3111 9578
      3133 9566 3147 9574 3152 9573 3160 9527
TIME...MOT...LOC 1309Z 292DEG 49KT 3174 9570 2987 9784

Special weather statement, Apr 4, 9:37 AM CDT, 1 hour 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
937 AM CDT MON APR 4 2011

TXZ163-176-177-198-041500-
GRIMES-HOUSTON-MADISON-WALKER-
937 AM CDT MON APR 4 2011

...SIGNIFICANT WEATHER ADVISORY...

AT 935 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 10 MILES SOUTHWEST OF MADISONVILLE...MOVING
NORTHEAST AT 45 MPH.

HAIL UP TO ONE HALF INCH IN DIAMETER...WINDS GREATER THAN 40 MPH...
ARE POSSIBLE WITH THIS STORM.

LOCATIONS IN THE PATH OF THIS STORM INCLUDE...NORTH ZULCH...IOLA...
BEDIAS...MIDWAY AND MADISONVILLE.

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.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 3 PM FOR THE AREA.

LAT...LON 3082 9558 3073 9608 3090 9617 3111 9583
      3111 9578 3114 9578 3119 9570
TIME...MOT...LOC 1437Z 246DEG 41KT 3086 9601

Special weather statement, Apr 4, 10:09 AM CDT, 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1009 AM CDT MON APR 4 2011

TXZ163-164-179-041600-
HOUSTON-POLK-TRINITY-
1009 AM CDT MON APR 4 2011

...SIGNIFICANT WEATHER ADVISORY...

AT 1003 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 20 MILES NORTH OF
APPLE SPRINGS TO 6 MILES WEST OF APPLE SPRINGS TO 24 MILES SOUTHWEST
OF APPLE SPRINGS...MOVING EAST AT 45 MPH.

WINDS GREATER THAN 40 MPH...ARE POSSIBLE WITH THESE STORMS.

LOCATIONS IN THE PATH OF THESE STORMS INCLUDE...MOSCOW AND APPLE
SPRINGS.

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 THESE STORMS HAVE PASSED.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 3 PM FOR THE ADVISORY
AREA.

LAT...LON 3152 9509 3148 9510 3145 9501 3140 9495
      3135 9495 3133 9490 3126 9488 3117 9482
      3115 9482 3112 9478 3110 9464 3106 9458
      3102 9465 3091 9463 3091 9514 3155 9513
TIME...MOT...LOC 1507Z 270DEG 41KT 3150 9502 3123 9502
          3095 9518

Special weather statement, Apr 4, 10:21 AM CDT, 31 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
1021 AM CDT MON APR 4 2011

TXZ164-177>179-199-041545-
MONTGOMERY-POLK-SAN JACINTO-TRINITY-WALKER-
1021 AM CDT MON APR 4 2011

...LINE OF STORMS MOVING THROUGH THE AREA...

AT 1017 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 24 MILES NORTHEAST
OF HUNTSVILLE TO 7 MILES SOUTHWEST OF HUNTSVILLE...MOVING NORTHEAST
AT 50 MPH.

ONE HALF INCH DIAMETER HAIL AND WINDS UP TO 50 MPH...ARE POSSIBLE
WITH THESE STORMS.

LOCATIONS IN THE PATH OF THESE STORMS INCLUDE...CRABBS PRAIRIE...
RIVERSIDE...POINT BLANK...OAKHURST AND HUNTSVILLE.

SEEK SHELTER IN A STURDY STRUCTURE OR NON-CONVERTIBLE AUTOMOBILE
UNTIL THESE STORMS HAVE PASSED.

LAT...LON 3116 9482 3076 9512 3049 9581 3057 9582
      3098 9552 3123 9485
TIME...MOT...LOC 1520Z 239DEG 68KT 3104 9530 3067 9558

Special weather statement, Apr 4, 10:40 AM CDT, 12 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
Apr 3, 9:51 PM CDT	Fire Weather Watch	HGX	Austin, Brazos, Burleson, Colorado, Fort Bend, Grimes and 10 more	14 hr
Apr 3, 10:17 PM CDT	Wind Advisory	HGX	Austin, Brazoria, Brazos, Burleson, Chambers, Colorado and 17 more	23 hr
Apr 4, 8:12 AM CDT	Special Weather Statement	HGX	Brazos, Burleson, Houston, Madison, Washington	63 min
Apr 4, 9:08 AM CDT	Severe Thunderstorm Warning	HGX	Houston	52 min
Apr 4, 9:37 AM CDT	Special Weather Statement	HGX	Madison	23 min
Apr 4, 10:09 AM CDT	Special Weather Statement	HGX	Angelina	51 min
Apr 4, 10:21 AM CDT	Special Weather Statement	HGX	Trinity, Walker	24 min
Apr 4, 10:40 AM CDT	Special Weather Statement	HGX	San Jacinto	35 min

Nearby

Severe Thunderstorm Warnings in Texas, 2011 Every 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.