Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 86, NWS Lubbock, TX

May 12, 20094 counties in Texas

NWS Lubbock, TX issued this severe thunderstorm warning at May 12, 2009, 7:42 PM CDT for 4 counties in Texas. It was in force for 63 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 12, 2009, 7:42 PM CDT (00:42 UTC)
Expired: May 12, 2009, 8:45 PM CDT
In force: 63 min
Issued by: NWS Lubbock, TX
Area: Storm-based polygon

Counties Childress County, TX, Cottle County, TX, Hall County, TX, Motley County, TX

The radar

The Altus AFB radar (KFDR), 139 km from the middle of the area, began a volume at 00:42 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 12, 5:41 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 0.7 hours before the alert went out and 300 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: 1269 J/kg
Mixed-layer CIN: -335 J/kg
Mixed-layer LCL: 581 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 487 m²/s²
0-3 km storm-relative helicity: 684 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

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 Lubbock, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at May 12, 6:29 PM CDT, 1 hour 13 minutes earlier.

Area forecast discussion, May 12, 6:29 PM CDT, 1 hour 13 minutes before

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Hazardous weather outlook, May 12, 2:19 PM CDT, 5 hours 23 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LUBBOCK TX
219 PM CDT TUE MAY 12 2009

TXZ021>044-131930-
PARMER-CASTRO-SWISHER-BRISCOE-HALL-CHILDRESS-BAILEY-LAMB-HALE-
FLOYD-MOTLEY-COTTLE-COCHRAN-HOCKLEY-LUBBOCK-CROSBY-DICKENS-KING-
YOAKUM-TERRY-LYNN-GARZA-KENT-STONEWALL-
219 PM CDT TUE MAY 12 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE EXTREME SOUTHERN TEXAS
PANHANDLE...SOUTH PLAINS AND ROLLING PLAINS.

.DAY ONE...THIS AFTERNOON AND TONIGHT

CONVECTIVE
ISOLATED TO SCATTERED THUNDERSTORMS WILL DEVELOP NEAR A DRYLINE OVER
THE WESTERN TO CENTRAL SOUTH PLAINS LATE THIS AFTERNOON AND WILL
MOVE EASTWARD OVER THE ROLLING PLAINS THROUGH THE EVENING HOURS.
MODERATE TO STRONG INSTABILITY WILL COMBINE WITH SUFFICIENT WIND
SHEAR TO PRODUCE A FAVORABLE ENVIRONMENT FOR SUPERCELL STORMS.
THUS A THREAT FOR VERY LARGE HAIL AND DAMAGING WINDS WILL
ACCOMPANY THUNDERSTORMS LATER TODAY. A THREAT FOR ISOLATED
TORNADOES ALSO WILL EXIST...ESPECIALLY NEAR THE INTERSECTION OF A
WARM FRONT AND THE DRYLINE OVER THE NORTHERN SOUTH PLAINS AND
EXTREME SOUTHEASTERN PANHANDLE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY
SEVERE THUNDERSTORMS MAY BE POSSIBLE ON FRIDAY ALONG AND EAST OF
THE DRYLINE.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON AND EVENING.

In the hours before

Special weather statement, May 12, 5:18 PM CDT, 2 hours 24 minutes before

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Special weather statement, May 12, 6:14 PM CDT, 1 hour 28 minutes before

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Local storm report, May 12, 6:18 PM CDT, 1 hour 24 minutes before

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Local storm report, May 12, 6:28 PM CDT, 1 hour 14 minutes before

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Local storm report, May 12, 6:58 PM CDT, 44 minutes before

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Local storm report, May 12, 6:59 PM CDT, 43 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 12, 7:11 PM CDT	Severe Thunderstorm Warning	LUB	Floyd, Motley	51 min
May 12, 7:13 PM CDT	Severe Thunderstorm Warning	LUB	Briscoe, Hall	34 min
May 12, 7:43 PM CDT	Severe Thunderstorm Warning	LUB	Kent, Stonewall	62 min
May 12, 8:00 PM CDT	Severe Thunderstorm Warning	LUB	Motley	33 min
May 12, 8:08 PM CDT	Severe Thunderstorm Warning	LUB	Dickens, Kent, King, Stonewall	37 min
May 12, 8:31 PM CDT	Severe Thunderstorm Warning	LUB	Childress, Cottle, Motley	44 min
May 12, 8:34 PM CDT	Severe Thunderstorm Warning	LUB	Dickens, King	42 min
May 12, 8:36 PM CDT	Severe Thunderstorm Warning	LUB	King, Stonewall	54 min
May 12, 9:04 PM CDT	Severe Thunderstorm Warning	LUB	King	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.