Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 57, NWS Amarillo, TX

May 15, 20094 counties in Texas

NWS Amarillo, TX issued this severe thunderstorm warning at May 15, 2009, 6:25 PM CDT for 4 counties in Texas. It was in force for 51 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: May 15, 2009, 6:25 PM CDT (23:25 UTC)
Expired: May 15, 2009, 7:16 PM CDT
In force: 51 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 23:25 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
May 15, 3:02 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.4 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: 2717 J/kg
Mixed-layer CIN: -204 J/kg
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 192 m²/s²
0-3 km storm-relative helicity: 326 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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 May 15, 5:53 PM CDT, 32 minutes earlier.

Area forecast discussion, May 15, 5:53 PM CDT, 32 minutes before

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Hazardous weather outlook, May 15, 6:25 PM CDT, 0 minutes before

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In the hours before

Special weather statement, May 15, 5:27 PM CDT, 58 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AMARILLO TX
527 PM CDT FRI MAY 15 2009

TXZ019-152300-
DONLEY TX-
527 PM CDT FRI MAY 15 2009

...STRONG THUNDERSTORM ACROSS DONLEY COUNTY...

AT 526 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 10 MILES SOUTHWEST OF LELIA LAKE...OR ABOUT 12
MILES SOUTH OF CLARENDON...MOVING NORTHEAST AT 15 MPH.

HAIL UP TO ONE HALF INCH IN DIAMETER AND WINDS AROUND 50 MPH ARE
POSSIBLE WITH THIS STORM.

STORM INTENSITY IS INCREASING AND SEVERE WEATHER MAY DEVELOP RAPIDLY.
BE PREPARED TO TAKE ACTION IF A WARNING IS ISSUED.

JOHNSON

Local storm report, May 15, 5:30 PM CDT, 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AMARILLO TX
530 PM CDT FRI MAY 15 2009

..TIME..    ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE..    ....MAG....     ..COUNTY LOCATION.. ST.. ...SOURCE....
            ..REMARKS..

0526 PM     TSTM WND DMG     2 E PAMPA               35.55N 100.93W
05/15/2009                   GRAY               TX   BROADCAST MEDIA

            NUMEROUS HOMES DAMAGED...TREES BLOWN DOWN...SHINGLES
            OFF SEVERAL HOMES DAMAGE IN ONE DIRECTION

&&

EVENT NUMBER AMA01388

JMG

Local storm report, May 15, 5:43 PM CDT, 42 minutes before

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Local storm report, May 15, 5:50 PM CDT, 35 minutes before

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Local storm report, May 15, 5:57 PM CDT, 28 minutes before

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Local storm report, May 15, 6:19 PM CDT, 6 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
May 15, 3:07 PM CDT	Severe Thunderstorm Warning	AMA	Ochiltree, Roberts	53 min
May 15, 3:58 PM CDT	Severe Thunderstorm Warning	AMA	Hutchinson, Ochiltree, Roberts	37 min
May 15, 4:03 PM CDT	Severe Thunderstorm Warning	AMA	Lipscomb	33 min
May 15, 4:08 PM CDT	Areal Flood Advisory	AMA	Roberts	3 hr
May 15, 4:29 PM CDT	Tornado Warning	AMA	Gray, Roberts	46 min
May 15, 4:51 PM CDT	Severe Thunderstorm Warning	AMA	Carson, Gray, Hutchinson, Roberts	54 min
May 15, 5:03 PM CDT	Tornado Warning	AMA	Gray, Roberts	42 min
May 15, 5:32 PM CDT	Severe Thunderstorm Warning	AMA	Armstrong, Carson, Collingsworth, Donley, Gray, Wheeler	58 min
May 15, 5:34 PM CDT	Tornado Warning	AMA	Gray, Wheeler	41 min
May 15, 5:42 PM CDT	High Wind Warning	AMA	Armstrong, Carson, Deaf Smith, Oldham, Potter, Randall	3 hr
May 15, 6:29 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Donley, Gray, Wheeler	61 min
May 15, 6:45 PM CDT	Severe Thunderstorm Warning	AMA	Collingsworth, Wheeler	60 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.