Alert archive / Texas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 20, NWS Houston/Galveston, TX

March 31, 2013Chambers County, Liberty County, Texas

NWS Houston/Galveston, TX issued this severe thunderstorm warning at Mar 31, 2013, 4:44 PM CDT for Chambers County, Liberty County, Texas. It was in force for 46 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 31, 2013, 4:44 PM CDT (21:44 UTC)
Expired: Mar 31, 2013, 5:30 PM CDT
In force: 46 min
Issued by: NWS Houston/Galveston, TX
Area: Storm-based polygon

Counties Chambers County, TX, Liberty County, TX

The radar

The Houston radar (KHGX), 60 km from the middle of the area, began a volume at 21:47 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 31, 2:48 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.7 hours before the alert went out and 150 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: 448 J/kg
Mixed-layer CIN: -118 J/kg
Mixed-layer LCL: 566 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

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 31, 3:41 PM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, Mar 31, 3:41 PM CDT, 1 hour 3 minutes before

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Hazardous weather outlook, Mar 31, 4:25 PM CDT, 19 minutes before

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In the hours before

Special weather statement, Mar 31, 2:09 PM CDT, 2 hours 35 minutes before

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Special weather statement, Mar 31, 2:29 PM CDT, 2 hours 15 minutes before

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Special weather statement, Mar 31, 2:40 PM CDT, 2 hours 4 minutes before

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Special weather statement, Mar 31, 2:53 PM CDT, 1 hour 51 minutes before

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Local storm report, Mar 31, 3:33 PM CDT, 1 hour 11 minutes before

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Special weather statement, Mar 31, 3:47 PM CDT, 57 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
Mar 31, 12:54 PM CDT	Severe Thunderstorm Warning	HGX	Polk, San Jacinto, Trinity, Walker	51 min
Mar 31, 1:44 PM CDT	Severe Thunderstorm Warning	HGX	Polk, San Jacinto	46 min
Mar 31, 2:09 PM CDT	Special Weather Statement	HGX	Washington	51 min
Mar 31, 2:29 PM CDT	Special Weather Statement	HGX	Liberty	46 min
Mar 31, 2:40 PM CDT	Special Weather Statement	HGX	Montgomery	50 min
Mar 31, 2:53 PM CDT	Special Weather Statement	HGX	Waller, Washington	52 min
Mar 31, 3:08 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Liberty, Montgomery, San Jacinto	37 min
Mar 31, 3:42 PM CDT	Severe Thunderstorm Warning	HGX	Harris, Liberty, Montgomery	48 min
Mar 31, 3:47 PM CDT	Special Weather Statement	HGX	Waller	58 min
Mar 31, 4:45 PM CDT	Special Marine Warning	HGX		60 min
Mar 31, 4:50 PM CDT	Severe Thunderstorm Warning	HGX	Harris	25 min
Mar 31, 4:51 PM CDT	Special Weather Statement	HGX	Fort Bend	39 min
Mar 31, 5:06 PM CDT	Severe Thunderstorm Warning	HGX	Chambers, Harris	24 min
Mar 31, 5:31 PM CDT	Special Weather Statement	HGX	Galveston	44 min
Mar 31, 5:41 PM CDT	Special Marine Warning	HGX		49 min
Mar 31, 5:45 PM CDT	Special Weather Statement	HGX	Colorado	45 min
Mar 31, 6:14 PM CDT	Special Weather Statement	HGX	Galveston	46 min

Nearby

Severe Thunderstorm Warnings in Texas, 2013 Every severe thunderstorm warning in 2013

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.