Alert archive / Texas / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 84, NWS Houston/Galveston, TX

December 23, 2014Brazoria County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Dec 23, 2014, 9:25 AM CST for Brazoria County, Texas. It was in force for 20 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 23, 2014, 9:25 AM CST (15:25 UTC)
Expired: Dec 23, 2014, 9:45 AM CST
In force: 20 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

County Brazoria County, TX

The radar

The Houston radar (KHGX), 48 km from the middle of the area, began a volume at 15:27 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.4 hours before the alert went out and 240 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: 1168 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 181 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.6

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 23, 5:35 AM CST, 3 hours 50 minutes earlier.

Area forecast discussion, Dec 23, 5:35 AM CST, 3 hours 50 minutes before

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Hazardous weather outlook, Dec 23, 7:23 AM CST, 2 hours 2 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 22, 9:38 PM CST	Dense Fog Advisory	HGX	Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston and 6 more	11 hr
Dec 23, 3:19 AM CST	Gale Warning	HGX		24 hr
Dec 23, 4:10 AM CST	Marine Dense Fog Advisory	HGX		8 hr
Dec 23, 9:48 AM CST	Special Marine Warning	HGX		27 min
Dec 23, 5:11 PM CST	Wind Advisory	HGX	Brazoria, Chambers, Galveston, Jackson, Matagorda	4 hr

Nearby

Severe Thunderstorm Warnings in Texas, 2014 Every severe thunderstorm warning in 2014

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.