Alert archive / Texas / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 141, NWS Houston/Galveston, TX

September 18, 2006Brazoria County, Galveston County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Sep 18, 2006, 5:46 AM CDT for Brazoria County, Galveston County, Texas. It was in force for 44 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 18, 2006, 5:46 AM CDT (10:46 UTC)
Expired: Sep 18, 2006, 6:30 AM CDT
In force: 44 min
Issued by: NWS Houston/Galveston, TX
Area: Counties, with a storm outline in the text

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 10:48 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, 10.8 hours before the alert went out and 274 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: 2862 J/kg
Mixed-layer CIN: -23 J/kg
Mixed-layer LCL: 971 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 46 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

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 Sep 18, 3:03 AM CDT, 2 hours 43 minutes earlier.

Area forecast discussion, Sep 18, 3:03 AM CDT, 2 hours 43 minutes before

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Hazardous weather outlook, Sep 17, 3:55 PM CDT, 13 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
355 PM CDT SUN SEP 17 2006

TXZ163-164-176>179-195>200-210>214-226-227-235>238-181230-
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-
355 PM CDT SUN SEP 17 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

...FLOOD WATCH IN EFFECT FOR SOUTHEAST TEXAS TONIGHT INTO MONDAY
MORNING...

.DAY ONE AND TWO...TONIGHT AND MONDAY

A COMBINATION OF TROPICAL MOISTURE FROM THE REMAINS OF TROPICAL
DEPRESSION LANE OVER MEXICO AND GULF MOISTURE STREAMING INTO THE
REGION WILL HELP TO FUEL NUMEROUS TO WIDESPREAD SHOWERS AND
THUNDERSTORMS TONIGHT THROUGH MONDAY MORNING. AN UPPER LEVEL STORM
SYSTEM OVER THE PLAINS WILL SHIFT EAST AND LIFT THIS MOISTURE
NORTHWARDS WHILE DRIVING A COLD FRONT SOUTH INTO SOUTHEAST TEXAS
LATE TONIGHT INTO MONDAY MORNING. THIS FRONT SHOULD PROVIDE
ADDITIONAL LIFT TO CAUSE A LARGE SWATH OF SHOWERS AND
THUNDERSTORMS TO DEVELOP TO THE WEST OF THE REGION AND SLOWLY
TRAVERSE THE AREA. THESE STORMS WILL BE CAPABLE OF SUSTAINED HEAVY
DOWNPOURS...BRINGING RAINFALL ACCUMULATIONS OF 1 TO 3 INCHES WITH
ISOLATED AMOUNTS OF 3 TO 5 INCHES. A FLOOD WATCH IS IN EFFECT FROM
MIDNIGHT TONIGHT THROUGH NOON MONDAY.

IN ADDITION...A MARGINAL THREAT OF SEVERE WEATHER STILL EXISTS
TONIGHT INTO MONDAY AHEAD OF THE FRONT. STRONG WINDS IN THE LOWER
PORTIONS OF THE ATMOSPHERE THAT VEER FROM SOUTH TO WEST WITH
HEIGHT MAY LEAD TO A THREAT OF SHORT LIVED TORNADOES OR POSSIBLY
MICROBURSTS.

THE RAIN SHOULD END FROM WEST TO EAST BY MONDAY AFTERNOON AS THE
FRONT PUSHES OUT INTO THE GULF OF MEXICO.

.DAY THREE THROUGH SEVEN...TUESDAY THROUGH SATURDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TONIGHT INTO MONDAY MORNING.

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 18, 2:56 AM CDT	Flash Flood Warning	HGX	Brazos, Grimes, Trinity, Walker, Washington	3 hr
Sep 18, 3:42 AM CDT	Special Marine Warning	HGX		63 min
Sep 18, 5:19 AM CDT	Severe Thunderstorm Warning	HGX	Brazoria, Galveston	26 min
Sep 18, 5:20 AM CDT	Special Marine Warning	HGX		85 min

Nearby

Severe Thunderstorm Warnings in Texas, 2006 Every severe thunderstorm warning in 2006

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.