Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 31, NWS Amarillo, TX

April 26, 2009Hemphill County, Lipscomb County, Roberts County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Apr 26, 2009, 3:23 PM CDT for Hemphill County, Lipscomb County, Roberts County, Texas. It was in force for 67 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 26, 2009, 3:23 PM CDT (20:23 UTC)
Expired: Apr 26, 2009, 4:30 PM CDT
In force: 67 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon

Counties Hemphill County, TX, Lipscomb County, TX, Roberts County, TX

The radar

The Amarillo radar (KAMA), 141 km from the middle of the area, began a volume at 20:22 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 26, 11:07 AM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 8.4 hours before the alert went out and 141 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: 1756 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 911 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 283 m²/s²
0-3 km storm-relative helicity: 315 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 11.9

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 Amarillo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 26, 2:48 PM CDT, 35 minutes earlier.

Area forecast discussion, Apr 26, 2:48 PM CDT, 35 minutes before

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Hazardous weather outlook, Apr 26, 1:48 PM CDT, 1 hour 35 minutes before

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In the hours before

Local storm report, Apr 26, 2:47 PM CDT, 36 minutes before

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Local storm report, Apr 26, 3:02 PM CDT, 21 minutes before

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Local storm report, Apr 26, 3:09 PM CDT, 14 minutes before

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Local storm report, Apr 26, 3:14 PM CDT, 9 minutes before

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Local storm report, Apr 26, 3:19 PM CDT, 4 minutes before

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Local storm report, Apr 26, 3:23 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 5:12 AM CDT	Red Flag Warning	AMA	Armstrong, Carson, Dallam, Deaf Smith, Hansford, Hartley and 6 more	16 hr
Apr 26, 11:14 AM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Wheeler	41 min
Apr 26, 11:28 AM CDT	Severe Thunderstorm Warning	AMA	Lipscomb, Ochiltree	62 min
Apr 26, 12:22 PM CDT	Severe Thunderstorm Warning	AMA	Lipscomb, Ochiltree	53 min
Apr 26, 12:39 PM CDT	Flash Flood Warning	AMA	Lipscomb, Ochiltree	4 hr
Apr 26, 12:48 PM CDT	Severe Thunderstorm Warning	AMA	Gray, Hemphill, Roberts	57 min
Apr 26, 1:30 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Lipscomb	60 min
Apr 26, 1:54 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Lipscomb	66 min
Apr 26, 2:28 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Lipscomb	62 min
Apr 26, 2:53 PM CDT	Severe Thunderstorm Warning	AMA	Gray, Hemphill, Wheeler	67 min
Apr 26, 3:39 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Wheeler	66 min
Apr 26, 4:13 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Wheeler	62 min
Apr 26, 4:38 PM CDT	Areal Flood Advisory	AMA	Hemphill, Wheeler	4 hr
Apr 26, 4:40 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Wheeler	55 min
Apr 26, 5:52 PM CDT	Severe Thunderstorm Warning	AMA	Hemphill, Lipscomb	21 min
Apr 26, 12:35 PM CDT	Tornado Warning	AMA	Beaver	25 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.