Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 45, NWS Amarillo, TX

April 29, 20094 counties in Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Apr 29, 2009, 8:30 PM CDT for 4 counties in Texas. It was in force for 45 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, 8:30 PM CDT (01:30 UTC)
Expired: Apr 29, 2009, 9:15 PM CDT
In force: 45 min
Issued by: NWS Amarillo, TX
Area: Storm-based polygon

Counties Armstrong County, TX, Carson County, TX, Donley County, TX, Gray County, TX

The radar

The Amarillo radar (KAMA), 57 km from the middle of the area, began a volume at 01:30 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, 3:47 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 1.5 hours before the alert went out and 56 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: 2227 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 1271 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 179 m²/s²
0-3 km storm-relative helicity: 254 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 18.2

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 29, 6:40 PM CDT, 1 hour 50 minutes earlier.

Area forecast discussion, Apr 29, 6:40 PM CDT, 1 hour 50 minutes before

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Hazardous weather outlook, Apr 29, 3:55 PM CDT, 4 hours 35 minutes before

TEXAS/OKLAHOMA PANHANDLES HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE AMARILLO TX
355 PM CDT WED APR 29 2009

OKZ001>003-TXZ001>020-301100-
ARMSTRONG-BEAVER-CARSON-CIMARRON-COLLINGSWORTH-DALLAM-DEAF SMITH-
DONLEY-GRAY-HANSFORD-HARTLEY-HEMPHILL-HUTCHINSON-LIPSCOMB-MOORE-
OCHILTREE-OLDHAM-POTTER-RANDALL-ROBERTS-SHERMAN-TEXAS-WHEELER-
355 PM CDT WED APR 29 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE TEXAS AND OKLAHOMA
PANHANDLES.

.DAY ONE...

A TORNADO WATCH IS IN EFFECT FOR THE OKLAHOMA PANHANDLE AND FOR ALL
BUT THE FAR WESTERN PARTS OF THE TEXAS PANHANDLE UNTIL 11 PM CDT.

THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND THIS EVENING ACROSS
ALL SECTIONS OF THE PANHANDLES. SOME THUNDERSTORMS MAY BECOME
SEVERE...MAINLY FOR AREAS EAST OF A LINE FROM BOISE CITY TO DALHART
TO HEREFORD. THE MAIN SEVERE THREATS WILL BE LARGE HAIL AND DAMAGING
WINDS. ISOLATED TORNADOES MAY ALSO OCCUR.

.DAYS TWO THROUGH SEVEN...

THUNDERSTORMS WILL ALSO BE POSSIBLE ACROSS MOST OF THE TEXAS AND
OKLAHOMA PANHANDLES FRIDAY NIGHT THROUGH SUNDAY...AND AGAIN ON MONDAY
NIGHT AND TUESDAY. SOME OF THESE STORMS MAY BECOME STRONG...BUT
WIDESPREAD SEVERE WEATHER IS NOT ANTICIPATED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER GROUPS AND EMERGENCY MANAGEMENT OFFICIALS ACROSS THE
PANHANDLES SHOULD CONTINUE TO MONITOR THE LATEST FORECAST AND BE
PREPARED FOR ACTIVATION THIS AFTERNOON AND THIS EVENING.

COCKRELL

In the hours before

Local storm report, Apr 29, 6:04 PM CDT, 2 hours 26 minutes before

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Local storm report, Apr 29, 6:05 PM CDT, 2 hours 25 minutes before

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Local storm report, Apr 29, 6:13 PM CDT, 2 hours 17 minutes before

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Local storm report, Apr 29, 6:20 PM CDT, 2 hours 10 minutes before

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Local storm report, Apr 29, 6:24 PM CDT, 2 hours 6 minutes before

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Local storm report, Apr 29, 6:25 PM CDT, 2 hours 5 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 29, 7:01 PM CDT	Areal Flood Advisory	AMA	Carson, Hutchinson	4 hr
Apr 29, 7:01 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Donley, Gray, Hutchinson, Potter and 1 more	44 min
Apr 29, 7:05 PM CDT	Areal Flood Advisory	AMA	Carson, Hutchinson	4 hr
Apr 29, 7:47 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Donley, Gray, Hutchinson, Potter	43 min
Apr 29, 9:14 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley, Gray, Wheeler	46 min
Apr 29, 10:20 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth	26 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.