Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 121, NWS San Angelo, TX

April 29, 2007Sterling County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 29, 2007, 3:02 PM CDT for Sterling County, Texas. It was in force for 43 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, 2007, 3:02 PM CDT (20:02 UTC)
Expired
Apr 29, 2007, 3:45 PM CDT
In force
43 min
Issued by
NWS San Angelo, TX
Area
Counties, with a storm outline in the text

County Sterling County, TX

The radar

The San Angelo radar (KSJT), 73 km from the middle of the area, began a volume at 20:03 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

Midland Regional, TX (KMAF), launched 12:00Z, 8.0 hours before the alert went out and 109 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, Midland Regional, TX at 12:00Z on 2007-04-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 996 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, Midland Regional, TX at 12:00Z on 2007-04-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.193958Sfc1 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
996 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
603 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
4 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.3

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 San Angelo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 29, 1:17 PM CDT, 1 hour 45 minutes earlier.

Area forecast discussion, Apr 29, 1:17 PM CDT, 1 hour 45 minutes before
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Hazardous weather outlook, Apr 29, 2:25 PM CDT, 37 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
225 PM CDT SUN APR 29 2007

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-301930-
FISHER-NOLAN-STERLING-COKE-RUNNELS-IRION-TOM GREEN-CONCHO-
CROCKETT-SCHLEICHER-SUTTON-HASKELL-THROCKMORTON-JONES-SHACKELFORD-
TAYLOR-CALLAHAN-COLEMAN-BROWN-MCCULLOCH-SAN SABA-MENARD-KIMBLE-
MASON-
225 PM CDT SUN APR 29 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WEST CENTRAL
TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT
A TORNADO WATCH IS IN EFFECT FOR CROCKETT...SUTTON...AND
SCHLEICHER COUNTIES UNTIL 8 PM. TORNADIC STORMS COULD DEVELOP
ANYTIME THROUGH THIS EVENING. THE MAIN THREATS ARE ISOLATED TORNADOES...
LARGE HAIL...LOCALLY HEAVY RAINFALL...AND DAMAGING WINDS.

AN UPPER LOW IN MEXICO WILL MOVE EAST TOWARD WEST CENTRAL TEXAS
THIS AFTERNOON AND TONIGHT. MOISTURE WILL CONTINUE TO FLOW NORTH
FROM THE GULF OF MEXICO AHEAD OF THE UPPER LOW. THUNDERSTORMS WITH
VERY HEAVY RAIN ARE EXPECTED TO FORM ACROSS THE NORTHERN EDWADS
PLATEAU LATE THIS EVENING AND MOVE NORTH AND NORTHEAST INTO WEST
CENTRAL TEXAS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY
LOCALLY HEAVY RAINFALL WILL CONTINUE TO BE THE MAIN THREAT AS THE
UPPER LOW SLOWLY MOVES EAST ACROSS WEST CENTRAL TEXAS MONDAY INTO
TUESDAY. SOME AREAS MAY SEE 2 TO 4 INCHES OF RAINFALL...WHICH
COULD PRODUCE FLOODING OF LOW LYING AREAS AND LOW WATER CROSSINGS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

.SPOTTER INFORMATION STATEMENT...

In the hours before

Special weather statement, Apr 29, 11:17 AM CDT, 3 hours 45 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
1117 AM CDT SUN APR 29 2007

TXZ076-291715-
CROCKETT TX-
1117 AM CDT SUN APR 29 2007

...SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 1215 PM CDT FOR CROCKETT
COUNTY...

AT 1112 AM CDT...A STRONG THUNDERSTORM WAS INDICATED BY NATIONAL
WEATHER SERVICE DOPPLER RADAR OVER EAST CENTRAL PECOS COUNTY...OR
ABOUT 7 MILES NORTH OF BAKERSFIELD...MOVING NORTH AT 25 MPH.

THE STRONG THUNDERSTORM WILL IMPACT U.S. HIGHWAY 385 BETWEEN GIRVIN
AND MCCAMEY...AND ALSO MAINLY RURAL AREAS OF...NORTHWESTERN CROCKETT
COUNTY.

HALF INCH SIZE HAIL AND WIND GUSTS TO 50 MPH ARE LIKELY WITH THIS
STORM. HEAVY RAINFALL WILL CAUSE PONDING OF WATER ON AREA
ROADWAYS...ESPECIALLY THOSE IN POOR DRAINAGE AREAS. RESIDENTS ARE
ENCOURAGED TO MONITOR THE SITUATION CLOSELY AND BE PREPARED TO TAKE
THE PROPER ACTIONS SHOULD A WARNING BE ISSUED.
Special weather statement, Apr 29, 1:27 PM CDT, 1 hour 35 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
127 PM CDT SUN APR 29 2007

TXZ049-291900-
FISHER TX-
127 PM CDT SUN APR 29 2007

...SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 200 PM CDT FOR FISHER
COUNTY...

AT 125 PM CDT...A STRONG THUNDERSTORM WAS INDICATED BY NATIONAL
WEATHER SERVICE DOPPLER RADAR 5 MILES NORTHWEST OF ROTAN...OR ABOUT
24 MILES WEST OF HAMLIN...MOVING NORTH AT 25 MPH.

THE STRONG THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF...
  NORTHWESTERN FISHER COUNTY.

THIS STORM WILL PRODUCE SMALL HAIL...AND STRONG WINDS NEAR 45 MPH.

BE PREPARED FOR A POSSIBLE WARNING.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 9:53 AM CDTFlash Flood WarningSJTCrockett4 hr
Apr 29, 3:01 PM CDTSevere Thunderstorm WarningSJTCoke, Tom Green25 min
Apr 29, 3:18 PM CDTSevere Thunderstorm WarningSJTCoke, Runnels, Tom Green42 min
Apr 29, 4:00 PM CDTSevere Thunderstorm WarningSJTCoke, Runnels45 min
Apr 29, 4:05 PM CDTFlash Flood WatchSJTBrown, Callahan, Coke, Coleman, Concho, Crockett and 18 more19 hr
Apr 29, 4:07 PM CDTSevere Thunderstorm WarningSJTHaskell23 min
Apr 29, 4:09 PM CDTTornado WarningSJTCoke, Runnels51 min
Apr 29, 4:26 PM CDTSevere Thunderstorm WarningSJTHaskell34 min
Apr 29, 4:57 PM CDTSevere Thunderstorm WarningSJTCoke, Nolan, Runnels, Taylor63 min
Apr 29, 5:13 PM CDTSevere Thunderstorm WarningSJTJones62 min
Apr 29, 5:16 PM CDTSevere Thunderstorm WarningSJTIrion, Sterling, Tom Green59 min
Apr 29, 5:47 PM CDTSevere Thunderstorm WarningSJTHaskell, Shackelford, Throckmorton58 min
Apr 29, 6:08 PM CDTSevere Thunderstorm WarningSJTCoke, Nolan52 min
Apr 29, 6:15 PM CDTFlash Flood WarningSJTHaskell, Jones, Shackelford, Throckmorton3 hr
Apr 29, 6:46 PM CDTSevere Thunderstorm WarningSJTShackelford, Throckmorton59 min

Nearby

Severe Thunderstorm Warnings in Texas, 2007Every severe thunderstorm warning in 2007

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.