Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 8, NWS San Angelo, TX

April 25, 2002Shackelford County, Texas

NWS San Angelo, TX issued this flash flood warning at Apr 25, 2002, 5:01 PM CDT for Shackelford County, Texas. It was in force for 3 hr. 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 25, 2002, 5:01 PM CDT (22:01 UTC)
Expired: Apr 25, 2002, 8:00 PM CDT
In force: 3 hr
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 flash flood 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, 10.0 hours before the alert went out and 197 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1491 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KSJT 252201
FFWSJT
TXC417-260100-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
500 PM CDT THU APR 25 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SHACKELFORD COUNTY IN NORTH CENTRAL TEXAS

* UNTIL 800 PM CDT

* AT 455 PM CDT...LAW ENFORCEMENT OFFICERS REPORTED FLASH FLOODING   
  IN AND NEAR THE CITY OF ALBANY. 

ALTHOUGH THE RAIN HAS STOPPED IN THE CITY OF ALBANY...FLASH FLOODING 
CONTINUES IN AND NEAR THE CITY OF ALBANY. 

DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. THE WATER DEPTH
MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. DO NOT ATTEMPT TO
DRIVE AROUND BARRICADES. MOST FLASH FLOOD DEATHS OCCUR IN VEHICLES.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER LOW SPOTS IF WATER COVERS
THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

LAT...LON 3257 9957 3256 9914 3293 9912 3294 9956

1 follow-up statement

000 
WGUS74 KSJT 252305
FFSSJT
TXC417-260100-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
605 PM CDT THU APR 25 2002

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR SHACKELFORD COUNTY 
UNTIL 800 PM CDT...

AT 603 PM CDT...THE WATER IN THE CITY OF ALBANY HAS RECEDED 
CONSIDERABLY. THE RAIN ENDED SHORTLY AFTER 4 PM. WATER DAMAGE HAS 
OCCURRED TO SEVERAL BUSINESSES IN THE CITY OF ALBANY. ROADWAYS HAVE 
BEEN RE-OPENED. AN OBSERVER IN ALBANY MEASURED 5.75 INCHES OF 
RAINFALL SO FAR TODAY.   
 
ALTHOUGH THE FLASH FLOOD THREAT CONTINUES TO DIMINISH...CONSIDERABLE 
STANDING WATER REMAINS. DO NOT DRIVE THROUGH WATER OF UNKNOWN DEPTH. 
MOST FLASH FLOOD RELATED DEATHS OCCUR IN AUTOMOBILES.

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Apr 25, 2:57 PM CDT, 2 hours 4 minutes earlier.

Area forecast discussion, Apr 25, 2:57 PM CDT, 2 hours 4 minutes before

WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
257 PM CDT THU APR 25 2002

AS AREA OF SHOWERS AND STORMS CONTINUES ACROSS THE CENTRAL AND
NORTHERN BIG COUNTRY THIS AFTERNOON...WITH SHACKELFORD COUNTY TAKING
THE BRUNT OF THE STORM. SURFACE FRONT HAS OOZED WELL SOUTH INTO THE
HILL COUNTRY...WITH ISENTROPIC LIFT UP AND OVER THE FRONT FUELING THE
CONVECTION. ABUNDANT MOISTURE IN PLACE...WITH MORNING SOUNDINGS FROM
MAF AND DRT SHOWING PRECIPITABLE WATER VALUES WELL ABOVE NORMAL. UPPER
SUPPORT IS FAIRLY WEAK...WITH ONLY A FEW WEAK SHORTWAVES RIDING THE
MOISTURE PLUME EXTENDING FROM THE PACIFIC ACROSS MEXICO AND INTO THE
SOUTHERN PLAINS.

MODELS CONTINUE TO HAVE DIFFICULTIES WITH THE ONGOING PRECIPITATION.
ALL AGREE THAT ISENTROPIC LIFT WILL CONTINUE ACROSS WEST CENTRAL
TEXAS...BUT TIMING AND PLACEMENT OF SHORTWAVES CONTINUES TO BE AN
ISSUE. BIG PICTURE...UPPER LOW OFF THE CALIFORNIA COAST WILL MOVE THIS
DIRECTION...WITH MODELS IN GENERAL AGREEMENT THAT THE SYSTEM WILL PASS
ACROSS NEW MEXICO AND INTO THE CENTRAL PLAINS ON SATURDAY. MODELS
USUALLY TOO FAST WITH THESE SYSTEMS COMING OUT OF THE WEST...AND HAVE
TRENDED SLOWER AGAIN THIS RUN...SO WILL COUNT ON THE SYSTEM BEING A
TAD SLOWER THAN THE 12Z MODELS SHOW.

WITH THE ISENTROPIC LIFT CONTINUING AND LOTS OF MOISTURE IN PLACE
...HARD TO RULE OUT SHOWERS OR STORMS JUST ABOUT ANYTIME INTO SATURDAY
MORNING. HOWEVER...AT FIRST GLANCE...THINK THERE WILL BE TWO TIMES
WHEN THE CHANCES WILL BE BETTER. THE FIRST WILL COME TONIGHT. LOW
LEVEL JET OF 40 TO 50 KNOTS OVERHEAD WILL HELP KICK OFF MORE
WIDESPREAD ACTIVITY...ESPECIALLY FROM THE BIG COUNTRY NORTHWARD WITH
THE NOSE OF THE LOW LEVEL JET. THINK WE MAY ALSO SEE CONVECTION
DEVELOP IN UPSLOPE FLOW ACROSS THE MOUNTAINS OF WEST TEXAS AND MOVE
EAST. SECOND CHANCE WILL COME FRIDAY NIGHT AND INTO SATURDAY
MORNING...AS THE DRYLINE ASSOCIATED WITH THE UPPER LOW MOVES ACROSS
THE AREA.

EXTENDED FORECAST LOOKS QUIET AS A DRIER PATTERN TAKES OVER.

ABI 050/068/062/083 6453
SJT 054/072/064/085 5352
JCT 059/070/063/080 5353

.SJT...NONE.

07

In the hours before

Special weather statement, Apr 25, 2:30 PM CDT, 2 hours 31 minutes before

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-140-
154-155-168>170-252315-

WEST CENTRAL TEXAS HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SAN ANGELO TX
230 PM CDT THU APR 25 2002

...A FEW THUNDERSTORMS MAY APPROACH SEVERE LIMITS OVER WEST CENTRAL
TEXAS THIS AFTERNOON AND TONIGHT...

NUMEROUS THUNDERSTORMS ARE EXPECTED OVER THE BIG COUNTRY NORTH OF
INTERSTATE 20 THIS AFTERNOON. SCATTERED STORMS WILL OCCUR FARTHER
SOUTH ACROSS WEST CENTRAL TEXAS. THE CHANCE FOR STORMS WILL CONTINUE
TONIGHT...AND THE BEST COVERAGE WILL BE OVER THE BIG COUNTRY.

A FEW STORMS MAY APPROACH SEVERE LIMITS...PRODUCING HAIL UP TO DIME
SIZE.

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
Apr 24, 8:01 PM CDT	Severe Thunderstorm Warning	SJT	Menard	44 min
Apr 25, 11:58 AM CDT	Flash Flood Warning	SJT	Shackelford	2 hr
Apr 25, 12:04 PM CDT	Flash Flood Warning	SJT	Shackelford	116 min
Apr 25, 12:52 PM CDT	Severe Thunderstorm Warning	SJT	Shackelford	38 min
Apr 25, 1:14 PM CDT	Severe Thunderstorm Warning	SJT	Shackelford	16 min
Apr 25, 2:00 PM CDT	Flash Flood Warning	SJT	Shackelford	3 hr
Apr 25, 2:35 PM CDT	Severe Thunderstorm Warning	SJT	Shackelford	55 min

Nearby

Flash Flood Warnings in Texas, 2002 Every flash flood 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.