Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 69, NWS San Angelo, TX

April 29, 2009Throckmorton County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 29, 2009, 3:16 PM CDT for Throckmorton County, Texas. It was in force for 14 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: Apr 29, 2009, 3:16 PM CDT (20:16 UTC)
Expired: Apr 29, 2009, 3:30 PM CDT
In force: 14 min
Issued by: NWS San Angelo, TX
Area: Storm-based polygon

County Throckmorton County, TX

The radar

The Dyess AFB radar (KDYX), 71 km from the middle of the area, began a volume at 20:19 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
Apr 29, 12:36 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 8.3 hours before the alert went out and 183 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: 1229 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 462 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.4

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 San Angelo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 29, 12:11 PM CDT, 3 hours 5 minutes earlier.

Area forecast discussion, Apr 29, 12:11 PM CDT, 3 hours 5 minutes before

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Hazardous weather outlook, Apr 29, 5:13 AM CDT, 10 hours 3 minutes before

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In the hours before

Local storm report, Apr 29, 1:16 PM CDT, 2 hours before

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Local storm report, Apr 29, 1:35 PM CDT, 1 hour 41 minutes before

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Local storm report, Apr 29, 2:15 PM CDT, 1 hour 1 minute before

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Local storm report, Apr 29, 2:34 PM CDT, 42 minutes before

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Local storm report, Apr 29, 2:40 PM CDT, 36 minutes before

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Local storm report, Apr 29, 2:41 PM CDT, 35 minutes before

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The office that day

Everything else NWS San Angelo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 29, 12:39 PM CDT	Severe Thunderstorm Warning	SJT	Fisher, Jones	51 min
Apr 29, 1:14 PM CDT	Severe Thunderstorm Warning	SJT	Haskell, Jones	46 min
Apr 29, 1:51 PM CDT	Severe Thunderstorm Warning	SJT	Haskell, Jones	39 min
Apr 29, 2:25 PM CDT	Severe Thunderstorm Warning	SJT	Haskell, Throckmorton	50 min
Apr 29, 3:05 PM CDT	Areal Flood Advisory	SJT	Haskell, Jones, Shackelford, Throckmorton	4 hr
Apr 29, 5:35 PM CDT	Tornado Warning	SJT	Crockett	55 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.