Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 321, NWS San Angelo, TX

June 20, 2007Shackelford County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Jun 20, 2007, 3:06 AM CDT for Shackelford County, Texas. It was in force for 24 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
Jun 20, 2007, 3:06 AM CDT (08:06 UTC)
Expired
Jun 20, 2007, 3:30 AM CDT
In force
24 min
Issued by
NWS San Angelo, TX
Area
Counties, with a storm outline in the text

County Shackelford County, TX

The radar

The Dyess AFB radar (KDYX), 24 km from the middle of the area, began a volume at 08:07 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
Jun 20, 1:10 AM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 8.1 hours before the alert went out and 193 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, Fort Worth, TX at 00:00Z on 2007-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3576 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, Fort Worth, TX at 00:00Z on 2007-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 square meters per square second.1939Sfc1 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
3576 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1390 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
27 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jun 20, 1:27 AM CDT, 1 hour 39 minutes earlier.

Area forecast discussion, Jun 20, 1:27 AM CDT, 1 hour 39 minutes before
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE SAN ANGELO TX
127 AM CDT WED JUN 20 2007

.UPDATE...
QUICK UPDATE TO ZONES/GRIDS TO ACCOUNT FOR WATCH NO. 426 IN EFFECT
UNTIL 9AM FOR POINTS ALONG AND NORTH OF A STERLING CITY...
BALLINGER...TO BROWNWOOD LINE INCLUDING ALL OF THE BIG COUNTRY.  11

&&

.PREV DISCUSSION... /ISSUED 1139 PM CDT TUE JUN 19 2007/

UPDATE...
A THUNDERSTORM COMPLEX HAS BEEN DEVELOPING AND PROGRESSING SOUTH
ACROSS THE TEXAS PANHANDLE FOR THE LAST COUPLE HOURS. MEANWHILE...ANOTHER
LARGER THUNDERSTORM COMPLEX PUSHING SOUTH ACROSS WESTERN OKLAHOMA
IS ABOUT TO OVERTAKE IT. WITH LITTLE IF ANY INDICATIONS OF SLOWING
EVIDENT IN THE SOUTHWARD PROGRESSION OF EITHER OF THESE...BELIEVE THE
BIG COUNTRY MAY SEE SOME SHOWER AND THUNDERSTORM ACTIVITY WITHIN
THE NEXT COUPLE HOURS. THUS...RECENT ZONE UPDATE INCLUDED
INCREASED CLOUD COVER AND 20 TO 30 POPS FOR THE BIG COUNTRY FOR
THE REMAINDER OF TONIGHT. OTHERWISE...NO OTHER CHANGES.

23/HUBER

PREV DISCUSSION... /ISSUED 1118 PM CDT TUE JUN 19 2007/

AVIATION...
A LARGE COMPLEX OF TSTMS WAS LOCATED OVER OKLAHOMA AND THE TEXAS
PANHANDLE. THESE STORMS WERE MOVING SLOWLY SOUTH...AND A FEW OF
THESE STORMS MAY MAKE INTO THE BIG COUNTRY LATE TONIGHT AND WEDNESDAY
MORNING. LOW LEVEL SOUTH TO SOUTHEAST FLOW IS EXPECTED THROUGH
WEDNESDAY. MAINLY VFR CONDITIONS ARE EXPECTED UNTIL 20/10Z. AREAS
OF MVFR CIGS BKN010-020 WILL DEVELOP ACROSS WEST CENTRAL TEXAS
AFTER 20/10Z...BECOMING MORE WIDESPREAD SOUTH OF I-20 AFTER
20/12Z.  21

PREV DISCUSSION... /ISSUED 338 PM CDT TUE JUN 19 2007/

SHORT TERM...
UPPER LEVEL HIGH IS CENTERED OVER THE TEXAS PANHANDLE REGION THIS
AFTERNOON WITH THE REMAINS OF THE UPPER LEVEL TROUGH LOCATED OVER
THE SOUTHEASTERN STATES. SIGNIFICANT CAPE EXTENDS FROM THE
NORTHERN PANHANDLE INTO KANSAS WITH CONVECTIVE IGNITION IN THIS
AREA BEGINNING BEFORE NOON TODAY...MUCH FURTHER NORTH THAN PROGD
BY THE NAM AND WITH THE GFS BEING SOMEWHERE IN THE BALLPARK.
BASED ON CURRENT OBSERVATIONS AND EXTRAPOLATED TRENDS...WILL
CONTINUE WITH A DRY FORECAST FOR THE FORECAST AREA IN THE SHORT
TERM. A RENEGADE THUNDERSTORM IS CERTAINLY POSSIBLE LATER THIS
AFTERNOON FAVORING THE NORTHERN CWA...BUT GIVEN THE
UNCERTAINTY...WILL NOT INCLUDE IN THE CURRENT FORECAST PACKAGE.

LONG TERM...
UPPER LEVEL HIGH PRESSURE RIDGE WILL DOMINATE THE WEATHER PICTURE
FOR THE SOUTHERN PLAINS THROUGH THE EXTENDED. DRY FORECAST RESULTS
WITH MIN AND MAX TEMPERATURES HOVERING AROUND CLIM0...HIGHS IN THE
MID 90S AND LOWS AROUND 70.

&&

.PRELIMINARY POINT TEMPS/POPS...
ABILENE 	 71  95  70  95 /  10  10  10  10
SAN ANGELO 	 71  95  72  95 /  10  10  10  10
JUNCTION 	 72  93  70  94 /  10  10  10  10

&&

.SJT WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

11
Hazardous weather outlook, Jun 19, 3:13 PM CDT, 11 hours 53 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
313 PM CDT TUE JUN 19 2007

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-
140-154-155-168>170-202015-
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-
313 PM CDT TUE JUN 19 2007

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

ALTHOUGH A VERY UNSTABLE AIR MASS CONTINUES ACROSS WEST CENTRAL
TEXAS THIS AFTERNOON...VERY WARM TEMPERATURES IN THE MID LEVELS OF
THE ATMOSPHERE HAS PREVENTED THUNDERSTORM FORMATION ACROSS THE AREA.
WITH THIS WARM AIR ALOFT EXPECTED TO HOLD THROUGH THE EVENING...NO
HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

In the hours before

Special weather statement, Jun 20, 1:55 AM CDT, 1 hour 11 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
155 AM CDT WED JUN 20 2007

TXZ049-054-113-127-200800-
NOLAN TX-JONES TX-FISHER TX-TAYLOR TX-
155 AM CDT WED JUN 20 2007

...SIGNIFICANT WEATHER ALERT EFFECTIVE UNTIL 300 AM CDT FOR NOLAN...
JONES...FISHER AND TAYLOR COUNTIES...

AT 153 AM CDT...A STRONG THUNDERSTORM WAS INDICATED BY NATIONAL
WEATHER SERVICE DOPPLER RADAR 10 MILES NORTHEAST OF ROTAN...OR ABOUT
16 MILES NORTHWEST OF HAMLIN...MOVING SOUTHEAST AT 20 MPH.

* THE STRONG THUNDERSTORM WILL BE NEAR...
  HITSON BY 225 AM CDT
  MCCAULLEY BY 245 AM CDT
  SYLVESTER BY 250 AM CDT
  NEINDA BY 255 AM CDT
  THE INTERSECTION OF US-180 AND RANCH ROAD 126 BY 300 AM CDT

PEA 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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 AM CDT
WEDNESDAY MORNING FOR WEST CENTRAL TEXAS.
Special weather statement, Jun 20, 2:59 AM CDT, 7 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 1:46 AM CDTSevere Thunderstorm WarningSJTHaskell, Throckmorton59 min
Jun 20, 2:19 AM CDTSevere Thunderstorm WarningSJTJones, Shackelford41 min
Jun 20, 2:44 AM CDTSevere Thunderstorm WarningSJTJones, Shackelford46 min
Jun 20, 2:46 AM CDTSevere Thunderstorm WarningSJTHaskell, Throckmorton44 min
Jun 20, 2:54 AM CDTSevere Thunderstorm WarningSJTCallahan, Taylor66 min
Jun 20, 3:30 AM CDTSevere Thunderstorm WarningSJTCallahan, Shackelford60 min
Jun 20, 4:18 AM CDTSevere Thunderstorm WarningSJTBrown, Coleman42 min
Jun 20, 5:18 AM CDTSevere Thunderstorm WarningSJTConcho, Tom Green42 min
Jun 20, 5:27 AM CDTSevere Thunderstorm WarningSJTBrown, Coleman, McCulloch, San Saba63 min
Jun 20, 5:30 AM CDTSevere Thunderstorm WarningSJTCrockett, Irion, Menard, Schleicher60 min
Jun 20, 6:29 AM CDTSevere Thunderstorm WarningSJTCrockett, Schleicher, Sutton61 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.