Alert archive / Texas / Special Weather Statements in 2012

Special Weather Statement, NWS Houston/Galveston, TX

December 4, 2012Harris County, Texas

NWS Houston/Galveston, TX issued this special weather statement at Dec 4, 2012, 2:17 PM CST for Harris County, Texas. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Dec 4, 2012, 2:17 PM CST (20:17 UTC)
Expired: Dec 4, 2012, 3:00 PM CST
In force: 43 min
Issued by: NWS Houston/Galveston, TX

County Harris County, TX

The radar

The Houston radar (KHGX), 18 km from the middle of the area, began a volume at 20:17 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 12:00Z, 8.3 hours before the alert went out and 287 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: 1399 J/kg
Mixed-layer CIN: -90 J/kg
Mixed-layer LCL: 715 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 76 m²/s²
0-3 km storm-relative helicity: 68 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Dec 4, 11:53 AM CST, 2 hours 24 minutes earlier.

Area forecast discussion, Dec 4, 11:53 AM CST, 2 hours 24 minutes before

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Hazardous weather outlook, Dec 4, 5:02 AM CST, 9 hours 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
502 AM CST TUE DEC 4 2012

TXZ163-164-176>179-195>200-210>214-226-227-235>238-051300-
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-
502 AM CST TUE DEC 4 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

PATCHY FOG THAT MAY BE DENSE AT TIMES WILL LIFT BY 9 AM ACROSS
THE COASTAL AND CENTRAL COUNTIES. SHOWERS AND THUNDERSTORMS WILL
THEN BE POSSIBLE...MAINLY THIS AFTERNOON AND EARLY THIS EVENING
AHEAD OF A COLD FRONT. ISOLATED STRONG TO SEVERE THUNDERSTORMS ARE
POSSIBLE DURING THE MID AND LATE AFTERNOON PERIOD. POSSIBLE
HAZARDOUS WEATHER CONDITIONS ARE STRONG GUSTY WINDS AND SMALL
HAIL.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING.

In the hours before

Special weather statement, Dec 4, 11:38 AM CST, 2 hours 39 minutes before

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Special weather statement, Dec 4, 12:09 PM CST, 2 hours 8 minutes before

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Special weather statement, Dec 4, 1:35 PM CST, 42 minutes before

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Special weather statement, Dec 4, 2:17 PM CST, 0 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 4, 5:17 AM CST	Dense Fog Advisory	HGX	Brazoria, Chambers, Fort Bend, Galveston, Harris, Jackson and 3 more	4 hr
Dec 4, 6:53 AM CST	Marine Dense Fog Advisory	HGX		2 hr
Dec 4, 11:24 AM CST	Severe Thunderstorm Warning	HGX	Houston, Madison, Trinity, Walker	36 min
Dec 4, 11:38 AM CST	Special Weather Statement	HGX	Grimes	37 min
Dec 4, 12:09 PM CST	Special Weather Statement	HGX	Trinity, Walker	51 min
Dec 4, 1:35 PM CST	Special Weather Statement	HGX	San Jacinto	55 min
Dec 4, 1:48 PM CST	Special Marine Warning	HGX		57 min
Dec 4, 2:38 PM CST	Special Weather Statement	HGX	Wharton	37 min
Dec 4, 2:43 PM CST	Special Weather Statement	HGX	Austin	47 min
Dec 4, 3:16 PM CST	Special Weather Statement	HGX	Liberty	44 min
Dec 4, 4:24 PM CST	Special Marine Warning	HGX		51 min
Dec 4, 5:17 PM CST	Special Weather Statement	HGX	Jackson	43 min
Dec 4, 5:48 PM CST	Special Marine Warning	HGX		27 min

Nearby

Special Weather Statements in Texas, 2012 Every special weather statement 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.