Alert archive / Texas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 253, NWS Lubbock, TX

July 19, 2009Briscoe County, Floyd County, Swisher County, Texas

NWS Lubbock, TX issued this severe thunderstorm warning at Jul 19, 2009, 2:21 AM CDT for Briscoe County, Floyd County, Swisher County, Texas. It was in force for 33 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
Jul 19, 2009, 2:21 AM CDT (07:21 UTC)
Expired
Jul 19, 2009, 2:54 AM CDT
In force
33 min
Issued by
NWS Lubbock, TX
Area
Storm-based polygon

Counties Briscoe County, TX, Floyd County, TX, Swisher County, TX

The radar

The Lubbock radar (KLBB), 88 km from the middle of the area, began a volume at 07:24 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 nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 7.4 hours before the alert went out and 98 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-pSkew-T log-p diagram, Amarillo Airport, TX at 00:00Z on 2009-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1339 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Amarillo Airport, TX at 00:00Z on 2009-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1339 J/kg
Mixed-layer CIN
-76 J/kg
Mixed-layer LCL
1880 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
344 m²/s²
Significant tornado parameter
0.2
Supercell composite
5.9

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 Lubbock, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 19, 12:12 AM CDT, 2 hours 9 minutes earlier.

Area forecast discussion, Jul 19, 12:12 AM CDT, 2 hours 9 minutes before
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Hazardous weather outlook, Jul 18, 4:46 AM CDT, 21 hours 35 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LUBBOCK TX
446 AM CDT SAT JUL 18 2009

TXZ021>044-191000-
PARMER-CASTRO-SWISHER-BRISCOE-HALL-CHILDRESS-BAILEY-LAMB-HALE-
FLOYD-MOTLEY-COTTLE-COCHRAN-HOCKLEY-LUBBOCK-CROSBY-DICKENS-KING-
YOAKUM-TERRY-LYNN-GARZA-KENT-STONEWALL-
446 AM CDT SAT JUL 18 2009

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

.DAY ONE...TODAY AND TONIGHT

CONVECTIVE

SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER PORTIONS OF
EASTERN NEW MEXICO...THE TEXAS PANHANDLE...AND THE SOUTH PLAINS
THIS AFTERNOON AND EVENING. SOME OF THESE STORMS WILL LIKELY
BECOME SEVERE...AND LOCALLY HEAVY RAINFALL WILL BE POSSIBLE. THE
MOST LIKELY LOCATIONS WITHIN THE OUTLOOK AREA TO EXPERIENCE
THUNDERSTORM AND SEVERE WEATHER ACTIVITY LATER TODAY WILL BE THE
EXTREME SOUTHERN PANHANDLE...AND AREAS OF THE SOUTH PLAINS WEST OF
THE CAPROCK ESCARPMENT. THE GREATEST SEVERE WEATHER THREAT WILL
LIKELY EXIST BETWEEN 4 PM AND MIDNIGHT...AS STORMS MOVE
SOUTHEASTWARD OVER THE WESTERN SOUTH PLAINS. GIVEN THE DEGREE OF
INSTABILITY AND SHEAR...A FEW SUPERCELL STORMS WILL BE POSSIBLE...
HOWEVER...THE PRIMARY SEVERE WEATHER HAZARD ASSOCIATED WITH THESE
STORMS WILL BE THE POTENTIAL FOR DAMAGING WINDS AS ACTIVITY CONGEALS
INTO A COMPLEX OF THUNDERSTORMS THIS EVENING. LARGE HAIL WILL ALSO
BE POSSIBLE. IN FACT...AN ISOLATED OCCURRENCE OF HAIL UP TO TWO
INCHES IN DIAMETER MAY OCCUR. IN ADDITION...A LOW THREAT FOR AN
ISOLATED TORNADO MAY ALSO EXIST...ESPECIALLY IF ANY REMNANT
OUTFLOW BOUNDARIES FROM LAST EVENING/S ROUND OF THUNDERSTORMS
BECOMES APPARENT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORM CHANCES WILL PERSIST SUNDAY AND INTO THE FIRST HALF
OF THE UPCOMING WORK WEEK. ALTHOUGH WIDESPREAD SEVERE WEATHER IS
NOT ANTICIPATED...A THREAT FOR ISOLATED AND BRIEFLY SEVERE STORMS
WILL EXIST EACH AFTERNOON AND EVENING.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING.

In the hours before

Special weather statement, Jul 19, 12:52 AM CDT, 1 hour 29 minutes before
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Special weather statement, Jul 19, 1:04 AM CDT, 1 hour 17 minutes before
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Special weather statement, Jul 19, 1:40 AM CDT, 41 minutes before
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Special weather statement, Jul 19, 2:03 AM CDT, 18 minutes before
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Special weather statement, Jul 19, 2:12 AM CDT, 9 minutes before
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Special weather statement, Jul 19, 2:21 AM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 7:31 PM CDTSevere Thunderstorm WarningLUBCastro59 min
Jul 18, 8:22 PM CDTSevere Thunderstorm WarningLUBBailey, Lamb, Parmer53 min
Jul 18, 9:12 PM CDTSevere Thunderstorm WarningLUBBailey, Cochran, Hockley, Lamb63 min
Jul 19, 1:18 AM CDTSevere Thunderstorm WarningLUBKing42 min
Jul 19, 1:54 AM CDTSevere Thunderstorm WarningLUBKent, King, Stonewall51 min
Jul 19, 2:44 AM CDTSevere Thunderstorm WarningLUBKent, Stonewall19 min

Nearby

Severe Thunderstorm Warnings in Texas, 2009Every 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.