Alert archive / Texas / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 71, NWS San Angelo, TX

April 28, 2002Mason County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Apr 28, 2002, 6:47 PM CDT for Mason County, Texas. It was in force for 58 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 28, 2002, 6:47 PM CDT (23:47 UTC)
Expired
Apr 28, 2002, 7:45 PM CDT
In force
58 min
Issued by
NWS San Angelo, TX
Area
Counties, with a storm outline in the text

County Mason 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 12:00Z, 11.8 hours before the alert went out and 229 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 2002-04-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1448 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 2002-04-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 184 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
1448 J/kg
Mixed-layer CIN
-389 J/kg
Mixed-layer LCL
1261 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
184 m²/s²
0-3 km storm-relative helicity
228 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

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

239 
WUUS54 KSJT 282347
SVRSJT
TXC319-290045-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
645 PM CDT SUN APR 28 2002

THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  MASON COUNTY IN SOUTH CENTRAL TEXAS

* UNTIL 745 PM CDT

* AT 645 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 8 MILES NORTHWEST OF KATEMCY...OR ABOUT 11
  MILES SOUTH OF BRADY...MOVING SOUTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
   KATEMCY AT 700 PM CDT
   FREDONIA AT 710 PM CDT

HAILSTONES AS LARGE AS ONE INCH ARE LIKELY WITH THIS STORM. MOVE TO 
AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING AND STAY 
AWAY FROM WINDOWS.

LAT...LON 3093 9910 3093 9947 3064 9935 3066 9897
          3087 9896

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 28, 4:44 PM CDT, 2 hours 3 minutes earlier.

Area forecast discussion, Apr 28, 4:44 PM CDT, 2 hours 3 minutes before
WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
444 PM CDT SUN APR 28 2002

LINE OF CU CONTINUES TO DEVELOP FROM SAN SABA COUNTY WESTWARD TO
JUST SOUTHEAST OF SAN ANGELO...WITH A FEW SHOWERS NOW SHOWING UP ON
RADAR. WENT AHEAD AND UPDATED TO ADD ISOLATED SHOWERS AND STORMS TO
THE SOUTHEAST ZONES.

07

...215 PM DISCUSSION...
CURRENT...SATELLITE IMAGERY INDICATES BAJA CALIFORNIA MOISTURE PLUME
HAS DECREASED DURING THE LAST 24 HOURS. AT THE SURFACE...METAR DATA
AND LAMP WIND STREAMLINE ANALYSIS SHOWS WEAK FRONT EXTENDS WEST TO
EAST ACROSS OUR SOUTHERN ZONES.

DAYS 1-3...MODELS INDICATE WEAK UPPER RIDGE WILL CONTINUE OVER TEXAS
THROUGH WEDNESDAY. SOME MID- AND UPPER-LEVEL MOISTURE WILL CONTINUE
UNTIL THEN. THUS...WILL CONTINUE PARTLY CLOUDY SKIES THROUGH
WEDNESDAY. MODELS CONTINUE TO PRESENT LOW POPS THROUGH WEDNESDAY.
HOWEVER...NOT CONFIDENT LOW-LEVEL FORCING WILL BE ABLE TO OVERCOME
UPPER CAP. THUS...WILL CONTINUE DRY FORECAST. SURFACE DRYLINE WILL
CONTINUE TO OUR WEST...WITH INSUFFICIENT DYNAMICS TO PUSH IT EAST.
TEMPERATURES CLOSE TO GUIDANCE LOOK GOOD. SURFACE WINDS WILL BE
LIGHT TONIGHT. TOMORROW...SOUTHERLY WINDS WILL BEGIN TO RETURN OVER
OUR SOUTHERN ZONES...AND BY TOMORROW NIGHT SOUTHERLY WINDS WILL
DOMINATE ALL OF WEST CENTRAL TEXAS.

DAYS 4-7...MODELS NOW SUGGESTING COLD FRONT...WHICH WILL MOVE ACROSS
WEST CENTRAL TEXAS LATE NEXT WEEK...WILL BRING MUCH COOLER AIR.
THUS...DECREASED TEMPERATURES...ESPECIALLY FOR FRIDAY. ALSO...BROKE
FRIDAY AND SATURDAY INTO TWO DIFFERENT PERIODS...AGAIN WITH MUCH
COOLER TEMPERATURES LIKELY ON FRIDAY. UNFORTUNATELY RAIN CHANCES
FOR FRIDAY AND SATURDAY DO NOT LOOK AS GOOD WITH THIS MODEL PACKAGE.
HOWEVER...WILL CONTINUE A SLIGHT CHANCE FOR AT LEAST ONE MORE MODEL
CYCLE.

CCF PRELIMS...

ABI 063/093/068/093 0000
SJT 065/095/070/095 0000
JCT 068/095/070/095 0000

.SJT...NONE.

23/HUBER

In the hours before

Special weather statement, Apr 28, 1:45 PM CDT, 5 hours 2 minutes before
TXZ054-064>066-071>073-076>078-098-099-113-114-127-128-139-140-154-
155-168>170-281415-

WEST CENTRAL TEXAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
145 PM CDT SUN APR 28 2002

...HAZARDOUS WEATHER IS NOT EXPECTED TONIGHT...

A COOL FRONT WHICH ALLOWED COOL AIR TO FILTER INTO THE BIG COUNTRY
WILL GRADUALLY DISSIPATE THIS EVENING. OTHERWISE...UPPER LEVEL HIGH
PRESSURE WILL CONTINUE HOT AND DRY CONDITIONS.

SPOTTER ACTIVATION IS NOT ANTICIPATED.

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.

IssuedProductOfficeCountiesLasted
Apr 28, 5:58 PM CDTSevere Thunderstorm WarningSJTMcCulloch62 min

Nearby

Severe Thunderstorm Warnings in Texas, 2002Every 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.