Alert archive / Texas / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 76, NWS San Angelo, TX

April 29, 2002Shackelford County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 29, 2002, 6:56 PM CDT for Shackelford County, Texas. It was in force for 49 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, 6:56 PM CDT (23:56 UTC)
Expired: Apr 29, 2002, 7:45 PM CDT
In force: 49 min
Issued by: NWS San Angelo, TX
Area: Counties, with a storm outline in the text

County Shackelford 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 29, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 11.9 hours before the alert went out and 182 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: 1434 J/kg
Mixed-layer CIN: -236 J/kg
Mixed-layer LCL: 1109 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

077 
WUUS54 KSJT 292356
SVRSJT
TXC417-300045-

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

THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SHACKELFORD COUNTY IN NORTH CENTRAL TEXAS

* UNTIL 745 PM CDT

* AT 653 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES WEST OF MORAN...OR ABOUT 11 MILES SOUTH
  OF ALBANY...MOVING NORTHEAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   IBEX AT 720 PM CDT

THIS IS A DANGEROUS STORM CAPABLE OF HAIL UP TO THE SIZE OF 
BASEBALLS AND DAMAGING WINDS IN EXCESS OF 80 MPH CAN BE EXPECTED 
FROM THIS STORM. THIS IS A DANGEROUS SITUATION. ABANDON MOBILE HOMES 
AND MOVE AS QUICKLY AS POSSIBLE TO AN INTERIOR ROOM OF A STURDY 
BUILDING.

LAT...LON 3256 9946 3252 9929 3252 9911 3274 9889
          3292 9910

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, 1 hour 45 minutes earlier.

Area forecast discussion, Apr 29, 5:11 PM CDT, 1 hour 45 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, 4 hours 49 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.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 29, 5:40 PM CDT	Severe Thunderstorm Warning	SJT	Callahan, Taylor	50 min
Apr 29, 6:14 PM CDT	Severe Thunderstorm Warning	SJT	Crockett	61 min
Apr 29, 6:20 PM CDT	Severe Thunderstorm Warning	SJT	Shackelford	40 min
Apr 29, 6:29 PM CDT	Severe Thunderstorm Warning	SJT	Callahan	46 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.