Alert archive / Texas / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 43, NWS Houston/Galveston, TX

March 21, 2005Polk County, San Jacinto County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Mar 21, 2005, 6:38 PM CST for Polk County, San Jacinto 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: Mar 21, 2005, 6:38 PM CST (00:38 UTC)
Expired: Mar 21, 2005, 7:22 PM CST
In force: 44 min
Issued by: NWS Houston/Galveston, TX
Area: Counties, with a storm outline in the text

Counties Polk County, TX, San Jacinto County, TX

The radar

The Houston radar (KHGX), 135 km from the middle of the area, began a volume at 00:38 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
Mar 21, 5:40 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.6 hours before the alert went out and 184 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: 1017 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 845 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 104 m²/s²
0-3 km storm-relative helicity: 252 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.0

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 Mar 21, 6:20 PM CST, 18 minutes earlier.

Area forecast discussion, Mar 21, 6:20 PM CST, 18 minutes before

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Hazardous weather outlook, Mar 21, 3:34 PM CST, 3 hours 4 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATE
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
334 PM CST MON MAR 21 2005

GMZ330-335-TXZ163-164-176>179-195>200-210>214-226-227-235>238-221300-
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-WHARTON-
334 PM CST MON MAR 21 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST TEXAS.

...MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS THE NORTHERN HALF OF
SOUTHEAST TEXAS AND A SLIGHT RISK ACROSS THE SOUTHERN HALF INTO THIS
EVENING...

.DAY ONE...REMAINDER OF THIS AFTERNOON AND TONIGHT.
A STORM SYSTEM WILL SLOWLY DRIFT TO THE EAST AND SOUTHEAST ACROSS
THE CENTRAL AND SOUTHERN PLAINS THROUGH TONIGHT. AN ASSOCIATED
DRYLINE AND WEAK COLD FRONT WILL MOVE ACROSS SOUTHEAST TEXAS
TONIGHT. AHEAD OF THIS FEATURE...SHOWER AND THUNDERSTORM DEVELOPMENT
CONTINUES TO BE POSSIBLE ACROSS SOUTHEAST TEXAS.

THE ATMOSPHERE REMAINS UNSTABLE ACROSS SOUTHEAST TEXAS AND CONTINUES
TO BE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS. THE
MAIN SEVERE WEATHER THREAT INCLUDES LARGE HAIL AND DAMAGING WINDS.
ISOLATED TORNADOES MAY ALSO DEVELOP. THE GREATEST CHANCE OF SEVERE
THUNDERSTORMS CONTINUES ACROSS THE NORTHERN HALF OF SOUTHEAST
TEXAS...GENERALLY ALONG AND NORTH OF INTERSTATE 10. HOWEVER...THE
THREAT FOR SEVERE WEATHER INCLUDES ALL OF SOUTHEAST TEXAS. THE RISK
FOR SEVERE THUNDERSTORMS WILL COME TO AN END LATE THIS EVENING AS
DRIER AIR FILTERS INTO THE AREA.

PERSONS ACROSS SOUTHEAST TEXAS SHOULD CONTINUE TO MONITOR THE LATEST
WEATHER INFORMATION.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
NO HAZARDOUS WEATHER IS EXPECTED.

.SPOTTER INFORMATION STATEMENT....
SPOTTER ACTIVATION REMAINS POSSIBLE THIS AFTERNOON AND THIS EVENING.

In the hours before

Local storm report, Mar 21, 3:37 PM CST, 3 hours 1 minute 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
Mar 22, 12:07 AM CST	Severe Thunderstorm Warning	HGX	Houston	23 min
Mar 22, 12:16 AM CST	Severe Thunderstorm Warning	HGX	Madison	29 min
Mar 22, 12:26 AM CST	Severe Thunderstorm Warning	HGX	Trinity	49 min
Mar 22, 12:30 AM CST	Severe Thunderstorm Warning	HGX	Houston	34 min
Mar 22, 1:17 AM CST	Severe Thunderstorm Warning	HGX	Trinity	28 min
Mar 22, 1:46 AM CST	Severe Thunderstorm Warning	HGX	Polk, Trinity	44 min
Mar 22, 2:04 AM CST	Severe Thunderstorm Warning	HGX	San Jacinto	26 min
Mar 22, 2:34 AM CST	Severe Thunderstorm Warning	HGX	Polk	41 min
Mar 22, 3:04 AM CST	Severe Thunderstorm Warning	HGX	Harris, Montgomery	33 min
Mar 22, 3:21 AM CST	Severe Thunderstorm Warning	HGX	Liberty	54 min

Nearby

Severe Thunderstorm Warnings in Texas, 2005 Every severe thunderstorm warning in 2005

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.