Alert archive / Texas / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 56, NWS San Angelo, TX

April 20, 2006Schleicher County, Tom Green County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 20, 2006, 11:27 AM CDT for Schleicher County, Tom Green County, 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
Apr 20, 2006, 11:27 AM CDT (16:27 UTC)
Expired
Apr 20, 2006, 12:30 PM CDT
In force
63 min
Issued by
NWS San Angelo, TX
Area
Counties, with a storm outline in the text

Counties Schleicher County, TX, Tom Green County, TX

The radar

The San Angelo radar (KSJT), 25 km from the middle of the area, began a volume at 16:26 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.

IssuedProductOfficeLasted
Apr 20, 9:30 AM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 4.5 hours before the alert went out and 201 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, Del Rio, TX at 12:00Z on 2006-04-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1378 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, Del Rio, TX at 12:00Z on 2006-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 82 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
1378 J/kg
Mixed-layer CIN
-155 J/kg
Mixed-layer LCL
702 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
82 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.8

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 San Angelo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 20, 11:06 AM CDT, 21 minutes earlier.

Area forecast discussion, Apr 20, 11:06 AM CDT, 21 minutes before
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Hazardous weather outlook, Apr 20, 5:52 AM CDT, 5 hours 35 minutes before
HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE SAN ANGELO TX
552 AM CDT THU APR 20 2006

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-211100-
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-
552 AM CDT THU APR 20 2006

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

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER ALL OF WEST
CENTRAL TEXAS TODAY. A STRONGER UPPER LEVEL DISTURBANCE WILL MOVE
EAST ACROSS NEW MEXICO AND INTO WEST TEXAS BY THIS EVENING. A
NEARLY STATIONARY FRONT ACROSS THE HILL COUNTRY AND EDWARDS PLATEAU
WILL MOVE BACK NORTH AS A WARM FRONT TODAY...POSSIBLY REACHING A
MERTZON TO SAN ANGELO TO BROWNWOOD LINE THIS AFTERNOON. A DRYLINE
WILL ADVANCE EAST INTO THE PERMAIN BASIN AND TRANS PECOS REGIONS.
WEAK LOW PRESSURE COULD DEVELOP IN WEST TEXAS THIS AFTERNOON AND
MAY TRACK EAST ALONG THE WARM FRONT THIS EVENING.

AS THE UPPER LEVEL DISTURBANCE APPROACHES AND THE WARM FRONT BEGINS
TO LIFT NORTH...THUNDERSTORMS WILL CONTINUE TO DEVELOP EARLY THIS
MORNING ACROSS THE NORTHERN HALF OF WEST CENTRAL TEXAS. ADDITIONAL
STORMS WILL DEVELOP ACROSS WEST CENTRAL TEXAS THIS AFTERNOON. GIVEN
THE LIFT WITH THE DISTURBANCE ALONG WITH FAVORABLE VERTICAL WIND
SHEAR AND INCREASING INSTABILITY...SEVERE STORMS WITH LARGE HAIL AND
DAMAGING WINDS WILL BE POSSIBLE. STORMS WHICH OCCUR IN THE VICINITY
OF THE WARM FRONT AND NEAR THE LOW PRESSURE CENTER WILL HAVE THE
POTENTIAL TO PRODUCE A TORNADO.

THE EXTENT AND MAGNITUDE OF THE SEVERE WEATHER WILL DEPEND IN
LARGE PART ON HOW UNSTABLE THE AIRMASS BECOMES. IF THUNDERSTORM
DEVELOPMENT INCREASES AND BECOMES MORE WIDESPREAD THIS MORNING...THE
AIRMASS WILL BE LESS UNSTABLE THIS AFTERNOON. SINCE SIGNIFICANT
SEVERE WEATHER WILL BE POSSIBLE...PEOPLE ACROSS WEST CENTRAL TEXAS
ARE ENCOURAGED TO CHECK LATER FORECASTS AND INFORMATION CONCERNING
THE SEVERE WEATHER POTENTIAL FOR TODAY AND EARLY TONIGHT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

SCATTERED THUNDERSTORMS WILL BE POSSIBLE FROM SATURDAY NIGHT
INTO THE FIRST PART OF NEXT WEEK...WHEN UPPER LEVEL DISTURBANCES
ARE FORECAST TO MOVE EAST INTO THE REGION AND INTERACT WITH A
DRYLINE OVER WEST TEXAS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED A TIMES TODAY AND THIS
EVENING.

In the hours before

Special weather statement, Apr 20, 6:04 AM CDT, 5 hours 23 minutes before
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Special weather statement, Apr 20, 9:27 AM CDT, 2 hours before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
927 AM CDT THU APR 20 2006

TXZ076-201500-
CROCKETT TX-
927 AM CDT THU APR 20 2006

...SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 1000 AM CDT FOR CROCKETT
COUNTY...

AT 925 AM CDT...A STRONG THUNDERSTORM WAS INDICATED BY NATIONAL
WEATHER SERVICE DOPPLER RADAR OVER EXTREME NORTHWESTERN CROCKETT
COUNTY...OR ABOUT 12 MILES SOUTHEAST OF MCCAMEY...MOVING NORTHEAST AT
25 MPH.

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

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 AM CDT
THURSDAY MORNING FOR WEST CENTRAL TEXAS.
Special weather statement, Apr 20, 11:20 AM CDT, 7 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
1120 AM CDT THU APR 20 2006

TXZ071-072-076-077-201715-
TOM GREEN TX-IRION TX-SCHLEICHER TX-CROCKETT TX-
1120 AM CDT THU APR 20 2006

...SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 1215 PM CDT FOR TOM
GREEN...IRION...SCHLEICHER AND CROCKETT COUNTIES...

AT 1117 AM CDT...A CLUSTER OF STRONG THUNDERSTORMS WAS INDICATED BY
NATIONAL WEATHER SERVICE DOPPLER RADAR IN SCHLEICHER AND SUTTON
COUNTIES...MOVING NORTHEAST AT 40 MPH.

* STRONG THUNDERSTORMS WILL BE NEAR...
  THE INTERSECTION OF US-190 AND RANCH ROAD 2084 BY 1130 AM CDT
  THE SCHLEICHER-TOM GREEN COUNTY LINE BY 1145 AM CDT
  SHERWOOD AND MERTZON BY 1150 AM CDT
  KNICKERBOCKER AND CHRISTOVAL BY 1155 AM CDT

SMALL HAIL AND WIND GUSTS TO 50 MPH ARE POSSILBE WITH THESE STORMS.
HEAVY RAINFALL MAY CAUSE PONDING OF WATER ON ROADWAYS...ESPECIALLY
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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 400 PM CDT
THURSDAY AFTERNOON FOR WEST CENTRAL TEXAS.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 7:11 PM CDTSevere Thunderstorm WarningSJTSutton34 min
Apr 19, 7:42 PM CDTSevere Thunderstorm WarningSJTKimble, Sutton22 min
Apr 19, 7:45 PM CDTSevere Thunderstorm WarningSJTKimble, Mason38 min
Apr 19, 8:11 PM CDTSevere Thunderstorm WarningSJTConcho, Runnels49 min
Apr 19, 8:35 PM CDTSevere Thunderstorm WarningSJTJones, Taylor40 min
Apr 19, 8:50 PM CDTSevere Thunderstorm WarningSJTCallahan, Shackelford55 min
Apr 19, 9:04 PM CDTSevere Thunderstorm WarningSJTSterling41 min
Apr 19, 9:07 PM CDTSevere Thunderstorm WarningSJTNolan53 min
Apr 19, 9:43 PM CDTSevere Thunderstorm WarningSJTCoke, Nolan, Sterling32 min
Apr 19, 9:52 PM CDTSevere Thunderstorm WarningSJTTaylor53 min
Apr 20, 12:39 AM CDTSevere Thunderstorm WarningSJTFisher, Jones, Nolan, Taylor36 min
Apr 20, 1:12 AM CDTSevere Thunderstorm WarningSJTJones, Taylor33 min
Apr 20, 1:44 AM CDTSevere Thunderstorm WarningSJTJones, Taylor31 min
Apr 20, 3:24 AM CDTFlash Flood WatchSJTCallahan, Fisher, Jones, Nolan, Shackelford, Taylor7 hr
Apr 20, 10:03 AM CDTFlash Flood WatchSJTCallahan, Fisher, Haskell, Jones, Nolan, Shackelford and 2 more18 hr
Apr 20, 12:00 PM CDTSevere Thunderstorm WarningSJTSutton30 min
Apr 20, 12:27 PM CDTFlash Flood WarningSJTKimble, Sutton2 hr
Apr 20, 12:32 PM CDTSevere Thunderstorm WarningSJTKimble, Sutton43 min
Apr 20, 1:14 PM CDTFlash Flood WarningSJTKimble2 hr
Apr 20, 1:17 PM CDTSevere Thunderstorm WarningSJTKimble58 min
Apr 20, 1:26 PM CDTSevere Thunderstorm WarningSJTConcho, Tom Green49 min
Apr 20, 2:13 PM CDTSevere Thunderstorm WarningSJTColeman, Concho, McCulloch47 min
Apr 20, 2:14 PM CDTSevere Thunderstorm WarningSJTMenard, Schleicher61 min
Apr 20, 4:17 PM CDTSevere Thunderstorm WarningSJTMcCulloch, Mason, San Saba58 min
Apr 20, 4:42 PM CDTSevere Thunderstorm WarningSJTConcho63 min
Apr 20, 5:25 PM CDTSevere Thunderstorm WarningSJTSan Saba50 min
Apr 20, 5:34 PM CDTSevere Thunderstorm WarningSJTConcho, McCulloch, Menard41 min
Apr 20, 6:04 PM CDTSevere Thunderstorm WarningSJTMcCulloch, Mason, Menard, San Saba56 min
Apr 20, 6:57 PM CDTSevere Thunderstorm WarningSJTMcCulloch, Mason, San Saba48 min

Nearby

Severe Thunderstorm Warnings in Texas, 2006Every severe thunderstorm warning in 2006

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.