Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 126, NWS Austin/San Antonio, TX

July 20, 2009Fayette County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Jul 20, 2009, 5:13 PM CDT for Fayette County, Texas. It was in force for 19 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: Jul 20, 2009, 5:13 PM CDT (22:13 UTC)
Expired: Jul 20, 2009, 5:32 PM CDT
In force: 19 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon

County Fayette County, TX

The radar

The Ft Hood radar (KGRK), 104 km from the middle of the area, began a volume at 22:13 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

Fort Worth, TX (KFWD), launched 12:00Z, 10.2 hours before the alert went out and 330 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: 2307 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 768 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 257 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 14.9

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 Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 3:56 PM CDT, 1 hour 17 minutes earlier.

Area forecast discussion, Jul 20, 3:56 PM CDT, 1 hour 17 minutes before

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Hazardous weather outlook, Jul 20, 2:23 PM CDT, 2 hours 50 minutes before

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In the hours before

Special weather statement, Jul 20, 3:38 PM CDT, 1 hour 35 minutes before

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Special weather statement, Jul 20, 4:32 PM CDT, 41 minutes before

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Special weather statement, Jul 20, 4:39 PM CDT, 34 minutes before

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Local storm report, Jul 20, 4:40 PM CDT, 33 minutes before

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Local storm report, Jul 20, 4:44 PM CDT, 29 minutes before

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Special weather statement, Jul 20, 4:52 PM CDT, 21 minutes before

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The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 7:32 PM CDT	Severe Thunderstorm Warning	EWX	Karnes	28 min
Jul 19, 8:05 PM CDT	Severe Thunderstorm Warning	EWX	Fayette, Lee	25 min
Jul 19, 8:50 PM CDT	Severe Thunderstorm Warning	EWX	Fayette	25 min
Jul 20, 4:29 PM CDT	Areal Flood Advisory	EWX	Bandera, Edwards, Gillespie, Kerr, Real	2 hr
Jul 20, 5:53 PM CDT	Severe Thunderstorm Warning	EWX	Fayette, Gonzales, Lavaca	52 min
Jul 20, 6:22 PM CDT	Areal Flood Advisory	EWX	Fayette, Gonzales, Lavaca	113 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009 Every severe thunderstorm warning in 2009

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.