Alert archive / Texas / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 77, NWS San Angelo, TX

April 29, 2002Sterling County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 29, 2002, 7:58 PM CDT for Sterling County, Texas. It was in force for 62 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 29, 2002, 7:58 PM CDT (00:58 UTC)
Expired: Apr 29, 2002, 9:00 PM CDT
In force: 62 min
Issued by: NWS San Angelo, TX
Area: Counties, with a storm outline in the text

County Sterling County, TX

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 1.0 hours before the alert went out and 276 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: 2371 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 2361 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 103 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS54 KSJT 300058
SVRSJT
TXC431-300200-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
758 PM CDT MON APR 29 2002

THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  STERLING COUNTY IN SOUTHWEST TEXAS

* UNTIL 900 PM CDT

* AT 757 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 15 MILES WEST OF STERLING CITY...OR ABOUT 15
  MILES EAST OF GARDEN CITY...MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   STERLING CITY AT 835 PM CDT
   BROOME AT 855 PM CDT

HAIL UP TO THE SIZE OF GOLF BALLS AND DAMAGING WINDS IN EXCESS OF 70
MPH CAN BE EXPECTED WITH THIS STORM. MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF A STURDY BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 3188 10137 3170 10133 3170 10083 3201 10082

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, 5:11 PM CDT, 2 hours 47 minutes earlier.

Area forecast discussion, Apr 29, 5:11 PM CDT, 2 hours 47 minutes before

WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
511 PM CDT MON APR 29 2002

.CURRENT...THUNDERSTORMS CURRENTLY DEVELOPING ALONG A BOUNDARY ALONG
A WINTERS TO BAIRD. THUNDERSTORMS DEVELOPING IN A VERY UNSTABLE
AIRMASS...HOWEVER A WEAK CAP STILL EXISTS. THIS CAP LOOKS LIKE IT IS
ABOUT TO BREAK AND AFTER COORDINATION WITH SPC WILL NEED TO UPDATE
ZONES FOR THUNDERSTORM WATCH. THUNDERSTORMS SHOULD BE ISOLATED IN
NATURE. WITH THE WATCH CONFIGURATION WILL NEED TO MAKE SOME
ADJUSTMENTS TO THE ZONE BREAK OUT.

27/BRAZZELL

****245 PM DISCUSSION BELOW******

CURRENT...SATELLITE IMAGERY SHOWS SHOW-WAVE RIDGE OVER NEW MEXICO
WITH MOST UPPER-LEVEL MOISTURE NOW NORTH OF OUR CWFA. AT THE
SURFACE...DRYLINE CONTINUES ALONG OUR WESTERN ZONES.

DAYS 1-3...TIME-HEIGHT ANALYSIS OF MODEL RELATIVE HUMIDITY DATA
INDICATES NO SIGNIFICANT MOISTURE WILL RETURN TO WEST CENTRAL TEXAS
THROUGH THURSDAY. HOWEVER...WILL CONTINUE PARTLY CLOUDY THROUGH
THURSDAY TO ACCOUNT FOR POSSIBLE THUNDERSTORM DEVELOPMENT AND
OCCASIONAL CIRRUS. AS FOR POPS...WILL INCLUDE ISOLATED EVENING
WORDING FOR THE CENTRAL AND EASTERN BIG COUNTRY AS WELL AS THE
HEARTLAND. ALSO...WILL INCLUDE WORDING FOR POSSIBLE SEVERE STORMS.
OTHERWISE...POPS NIL. TEMPERATURES CLOSE TO GUIDANCE LOOK GOOD WITH
COOLER OVERNIGHT LOWS WEDNESDAY NIGHT AND HIGHS THURSDAY ONLY IN THE
75 TO 80 RANGE. SURFACE WINDS WILL CONTINUE TO BE SOUTHERLY TONIGHT
AND TOMORROW WITH A SHIFT TO THE WEST BY WEDNESDAY MORNING IN
RESPONSE TO THE APPROACHING COLD FRONT. WINDS TOMORROW WILL INCREASE
INTO THE BREEZY RANGE BY THE AFTERNOON.

DAYS 4-7...TEMPERATURES WILL BE COOLER FOR FRIDAY THROUGH THE
WEEKEND WITH AN AIRMASS CHANGE BEHIND THE COLD FRONT. WILL CONTINUE
SLIGHT CHANCE WORDING FOR SATURDAY THROUGH MONDAY.

CCF PRELIMS...

ABI 065/095/068/093 0000
SJT 068/098/070/095 0000
JCT 070/095/068/095 0000

.SJT...NONE.

23/HUBER

In the hours before

Special weather statement, Apr 29, 2:07 PM CDT, 5 hours 51 minutes before

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-140-
154-155-168>170-291500-

WEST CENTRAL TEXAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
207 PM CDT MON APR 29 2002

...ISOLATED SEVERE THUNDERSTORMS ARE POSSIBLE IN THE BIG COUNTRY
AND HEARTLAND THIS EVENING...

IT WILL BECOME UNSTABLE THIS EVENING ACROSS THE BIG COUNTRY AND
HEARTLAND THIS AFTERNOON...DUE TO INCREASING MOISTURE FROM THE EAST
AND STRONG SURFACE HEATING. A WEAK FRONTAL BOUNDARY ACROSS THE REGION
WILL HELP TO TRIGGER A FEW THUNDERSTORMS ALONG AND EAST OF A
HASKELL...TO ABILENE...TO BRADY LINE. STORMS WILL END NEAR SUNSET.

ISOLATED SEVERE STORMS ARE POSSIBLE...WITH STRONG GUSTY
WINDS TO 60 MPH AND LARGE HAIL POSSIBLE.

SPOTTER ACTIVATION MAY BE NEEDED.

FOR ADDITIONAL INFORMATION PLEASE SEE STATEMENTS AND OUTLOOKS FROM
NATIONAL WEATHER SERVICE OFFICES ACROSS TEXAS...OKLAHOMA...AND NEW
MEXICO.

Local storm report, Apr 29, 7:41 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN ANGELO, TX
741 PM CDT MON APR 29 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0550 PM    3 E TUSCOLA               TX   WIND DAMAGE
04/29/02   TAYLOR                         OUTBUILDING DESTROYED

0555 PM    12 SW CLYDE               TX   1.75 INCH HAIL
04/29/02   CALLAHAN

0605 PM    12 SW CLYDE               TX   1.75 INCH HAIL
04/29/02   CALLAHAN

0605 PM    12 SW CLYDE               TX   70 MPH TSTM WIND GUST
04/29/02   CALLAHAN

0640 PM    1 N MORAN                 TX   1.75 INCH HAIL
04/29/02   SHACKELFORD

0645 PM    7 SW CLYDE                TX   WIND DAMAGE
04/29/02   CALLAHAN                       HOUSE ROOF DAMAGED...
                                          10 INCH DIAMETER TREE
                                          TRUNKS SNAPPED
                                                                                    MOBILE HOMES DAMAGED
14

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 8:06 PM CDT	Severe Thunderstorm Warning	SJT	Shackelford	24 min
Apr 29, 9:07 PM CDT	Severe Thunderstorm Warning	SJT	Nolan	38 min
Apr 29, 9:39 PM CDT	Severe Thunderstorm Warning	SJT	Taylor	36 min
Apr 29, 10:06 PM CDT	Severe Thunderstorm Warning	SJT	Jones, Shackelford	39 min
Apr 29, 10:34 PM CDT	Severe Thunderstorm Warning	SJT	Throckmorton	41 min
Apr 29, 10:44 PM CDT	Severe Thunderstorm Warning	SJT	Shackelford	46 min
Apr 29, 11:11 PM CDT	Severe Thunderstorm Warning	SJT	Throckmorton	34 min

Nearby

Severe Thunderstorm Warnings in Texas, 2002 Every severe thunderstorm warning in 2002

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.