Alert archive / Texas / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 274, NWS San Angelo, TX

December 23, 2002San Saba County, Texas

NWS San Angelo, TX issued this severe thunderstorm warning at Dec 23, 2002, 5:33 PM CST for San Saba County, Texas. It was in force for 57 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: Dec 23, 2002, 5:33 PM CST (23:33 UTC)
Expired: Dec 23, 2002, 6:30 PM CST
In force: 57 min
Issued by: NWS San Angelo, TX
Area: Counties, with a storm outline in the text

County San Saba 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

Fort Worth, TX (KFWD), launched 12:00Z, 11.6 hours before the alert went out and 240 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: 4 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 426 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 389 m²/s²
0-3 km storm-relative helicity: 444 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

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

094 
WUUS54 KSJT 232333
SVRSJT
TXC411-240030-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
533 PM CST MON DEC 23 2002

THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SAN SABA COUNTY IN NORTH CENTRAL TEXAS

* UNTIL 630 PM CST

* AT 528 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
  SEVERE THUNDERSTORM NEAR FREDONIA...OR ABOUT 12 MILES NORTHEAST OF 
  MASON...MOVING NORTHEAST AT 45 MPH.

* THESE THUNDERSTORMS WILL PASS NEAR OR JUST TO THE SOUTH OF THE     
  CITY OF SAN SABA BETWEEN 550 PM AND 600 PM.

HAILSTONES AS LARGE AS DIMES 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 3110 9908 3093 9908 3093 9848 3128 9865
          3140 9885 3136 9901

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 Dec 23, 3:15 PM CST, 2 hours 18 minutes earlier.

Area forecast discussion, Dec 23, 3:15 PM CST, 2 hours 18 minutes before

WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
315 PM CST MON DEC 23 2002

RECEIVED REPORT OF 20 MINUTES OF PEA SIZE HAIL IN ROCHELLE. WITH
RADAR INDICATING A FEW STRONGER STORMS STILL LINGERING IN THE
SOUTHEAST...UPDATED TO ADD MENTION OF A FEW SEVERE STORMS IN THE
SOUTHEAST COUNTIES. WITH THE ELEVATED INSTABILITY EXPECTED TO
CONTINUE TO MOVE OFF TO THE SOUTH AND EAST...EXPECT TO UPDATE LATER
THIS EVENING TO REMOVE MENTION OF ANY SEVERE STORMS.

24

BELOW IS MAIN AFTERNOON DISCUSSION.
---------------------------------------------------------------------
THE WATER VAPOR LOOP INDICATED UPPER LEVEL LOW WAS IN
EAST CENTRAL ARIZONA...LIFTING NORTHEAST THIS AFTERNOON. A DRY SLOT
WAS OVER WEST CENTRAL TEXAS...WITH A SHORTWAVE NEARING FAR WEST
TEXAS AND THE BIG BEND AT 1 PM.  SKIES CLEARED TEMPORARILY IN
JUNCTION AT NOON TO ALLOW THE TEMPERATURE TO SHOOT TO 70
DEGREES...OTHERWISE TEMPERATURES WERE IN THE UPPER 30S IN THE BIG
COUNTRY AND 40S ELSEWHERE. THE COLD FRONT PUSHED THROUGH JUNCTION
AROUND 1230 PM AND TEMPERATURES FELL BACK TO 61 DEGREES. THE
INFRARED SHOWED THE FRONT FROM SOUTHEAST SAN SABA COUNTY TO SOUTHERN
KIMBLE COUNTY...PUSHING SOUTHEAST.

WEST CENTRAL TEXAS WILL BE BETWEEN THE TWO BIGGEST WEATHER MAKERS.
THE MOIST UNSTABLE AIR NEAR THE COLD FRONT MAY PRODUCE A SEVERE
THUNDERSTORM OR TWO IN SOUTHEASTERN SECTION THIS EVENING. WITH FRONT
PUSHING SOUTHEAST HOWEVER...CHANCES WILL DECREASE THIS EVENING. DAY
ONE SEVERE WEATHER OUTLOOK HAS A MODERATE RISK OF STORM EAST OF A
JUNCTION TO SAN SABA LINE.

THE SECOND WEATHER MAKER...THE SHORTWAVE OVER THE BIG BEND...WILL
MOVE NORTHEAST OVER WEST CENTRAL TEXAS THIS EVENING. WILL GO WITH
LIKELY POPS OVER THE N EDWARDS PLATEAU...CONCHO VALLEY AND BIG
COUNTRY TONIGHT BECAUSE OF THIS FEATURE...THOUGH RAIN AMOUNTS WILL
BE 1 OR 2 HUNDREDTHS OF AN INCH. AVN MODEL INDICATED THE 540
THICKNESS LINE TO FALL ALONG INTERSTATE 20 AT 06Z (MIDNIGHT) AND
SOUTH TO A OZONA TO BROWNWOOD LINE AT 12Z. MODEL SOUNDINGS INDICATED
A CHANGE OVER FROM RAIN TO SNOW ACROSS HASKELL AND THROCKMORTON THIS
EVENING...AND PERHAPS THE ABILENE AND INTERSTATE 20 AREA AROUND
MIDNIGHT. MAIN PROBLEM WITH ALL OF THIS? GETTING MEASURABLE SNOW
AMOUNTS MOISTURE IS QUITE SHALLOW...ESPECIALLY AFTER MIDNIGHT. THUS
MAINLY SNOW FLURRIES...THOUGH CAN NOT RULE OUT ONE OR TWO PLACES
RECEIVING LIGHT ACCUMULATIONS OF LESS THAN 1 INCH.

AVN SHOWS A SECONDARY SHORTWAVE MOVING THROUGH THE REGION BETWEEN 3
AM AND 9 AM TUESDAY MORNING. MOISTURE IS MORE SHALLOW AT THIS
TIME...SO THINK FLURRIES MORE LIKELY OVER THE CONCHO VALLEY AND BIG
COUNTRY.

TUESDAY NIGHT...UPPER TROUGH MOVES ACROSS...WITH SKIES CLEARING.
WITH WINDS BECOMING LIGHT...SHOULD SEE TEMPERATURES IN THE MID 20S
ACROSS THE REGION.

CHRISTMAS...JUST PARTLY CLOUDY WITH TEMPERATURES REBOUNDING WITH THE
SUN. A WEAK SHORTWAVE MAY PUSH THROUGH THE RED RIVER WEDNESDAY
NIGHT...ALLOWING THE SKIES TO CLOUD UP OVER THE BIG COUNTRY.
POTENTIAL EXISTS FOR A FLURRY OR TWO BUT WONT MENTION IT THE ZONES.

THURSDAY INTO MONDAY....WARMING TREND EXTENDS THROUGH SATURDAY. MAY
SEE SOME HIGH CLOUDS MOVING WITH APPROACH A STRONG UPPER TROUGH
SUNDAY...AND A COLD FRONT SUNDAY NIGHT. AT THIS POINT THE FRONT
LOOKS DRY.

ABI 029/036/023/048 6200
SJT 032/040/025/052 6200
JCT 035/042/024/053 4200

.SJT...NONE.

04

Hazardous weather outlook, Dec 23, 2:15 PM CST, 3 hours 18 minutes before

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-140-
154-155-168>170-242000-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
215 PM CST MON DEC 23 2002

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WEST CENTRAL TEXAS.

.DAY ONE...MOST OF THE WEATHER ASSOCIATED WITH THE UPPER LEVEL STORM
SYSTEM IS IMPACTING AREAS NORTH AND EAST OF WEST CENTRAL TEXAS.
VERY LIGHT RAIN OR DRIZZLE IS ABOUT ALL THAT WE WILL SEE THROUGH THE
EVENING HOURS.

ANOTHER UPPER LEVEL DISTURBANCE WILL MOVE ACROSS THE AREA TONIGHT
AND EARLY TUESDAY MORNING.  WHILE LIMITED ON MOISTURE THERE MAY BE A
FEW LIGHT SNOW SHOWERS OF FLURRIES ALONG THE I-20 CORRIDOR.

.DAYS TWO THROUGH SEVEN...SKIES WILL CLEAR AND WE WILL SEE SEASONAL
TEMPERATURES.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 23, 5:08 PM CST	Severe Thunderstorm Warning	SJT	Mason	52 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.