Alert archive / Texas / Flash Flood Warnings in 2003

Flash Flood Warning 66, NWS San Angelo, TX

August 30, 2003Tom Green County, Texas

NWS San Angelo, TX issued this flash flood warning at Aug 30, 2003, 3:51 PM CDT for Tom Green County, Texas. It was in force for 114 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: Aug 30, 2003, 3:51 PM CDT (20:51 UTC)
Expired: Aug 30, 2003, 5:45 PM CDT
In force: 114 min
Issued by: NWS San Angelo, TX
Area: Counties, with a storm outline in the text

County Tom Green 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

Midland Regional, TX (KMAF), launched 12:00Z, 8.9 hours before the alert went out and 168 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: 433 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -3 m²/s²
0-3 km storm-relative helicity: 19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KSJT 302055
FFWSJT
TXC451-302245-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
351 PM CDT SAT AUG 30 2003

THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  TOM GREEN COUNTY IN WEST CENTRAL TEXAS

* UNTIL 545 PM CDT

* AT 350 PM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED A 
  CLUSTER OF THUNDERSTORMS WITH VERY HEAVY RAINFALL OVER 
  THE SOUTHERN HALF OF TOM GREEN COUNTY...MOVING EAST AT 
  20 MPH. OTHER STORMS WITH VERY HEAVY RAINFALL WERE MOVING
  INTO WESTERN TOM GREEN COUNTY FROM NORTHEASTERN IRION COUNTY.  

* THE THUNDERSTORMS WITH EXCESSIVE RAINFALL AFFECT SOUTHERN 
  TWO-THIRDS OF TOM GREEN COUNTY UNTIL 545 PM. 

* A SKYWARN SPOTTER REPORTED 2.5 INCHES OF RAIN IN DOVE CREEK.

TURN AROUND DONT DROWN DO NOT DRIVE INTO AREAS WHERE WATER COVERS
THE ROAD. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW SAFE PASSAGE.
REMEMBER...MOST FLASH FLOOD DEATHS OCCUR IN VEHICLES. 


LAT...LON 3162 10081 3154 10066 3113 10065 3113 10016
          3157 10016 3159 10030 3166 10028 3167 10071

$$

19

1 follow-up statement

000 
WGUS74 KSJT 302202
FFSSJT
TXC451-302245-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
501 PM CDT SAT AUG 30 2003

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR TOM GREEN COUNTY 
UNTIL 545 PM CDT...

AT 500 PM CDT...DOPPLER RADAR INDICATED SCATTERED SHOWERS AND 
THUNDERSTORMS OVER TOM GREEN COUNTY...MOVING EAST AT 15 MPH.
A SKYWARN SPOTTER AT DOVE CREEK REPORTED A TOTAL OF 5 INCHES 
OF RAINFALL SINCE STORMS BEGAN AROUND 300 PM. DOPPLER RADAR 
ESTIMATES THAT 2 TO 3 INCHES OF RAIN HAVE FALLEN AT OTHER 
SCATTERED LOCATIONS IN TOM GREEN COUNTY. 

THE SCATTERED STORMS WITH HEAVY RAIN WILL CONTINUE UNTIL 545 PM.
LOCALIZED FLOODING IS LIKELY WHERE THE HEAVIER RAIN HAS FALLEN.
MOTORISTS SHOULD USE EXTRA CAUTION AND AVOID DRIVING INTO AREAS
WHERE WATER COVERS THE ROAD.

$$

19

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 Aug 30, 3:35 PM CDT, 16 minutes earlier.

Area forecast discussion, Aug 30, 3:35 PM CDT, 16 minutes before

WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
335 PM CDT SAT AUG 30 2003

CURRENT...LATEST SATELLITE AND WSR-88D DATA INDICATING MAIN
CONVERGENCE AREA HAS DEVELOPED OVER OUR SOUTHEASTERN COUNTIES.
SURFACE DEWPOINTS ARE IN THE 65 TO 70 RANGE ACROSS WEST CENTRAL
TEXAS.

DAYS 1-3...MODELS CONTINUE TO BRING THE FRONT THROUGH WEST CENTRAL
TEXAS BY TOMORROW AFTERNOON. AFTER COORDINATION WITH FORT WORTH AND
NEW BRAUNFELS...DECIDED NOT TO GO WITH A FLASH FLOOD WATCH FOR
TONIGHT. BEST POPS TONIGHT WILL BE ACROSS OUR SOUTHEASTERN COUNTIES.
WITH ATMOSPHERE VERY TROPICAL...EXPECT SOME LOCALLY HEAVY RAINFALL.
RAIN CHANCES DECREASE AFTER TOMORROW AS THE FRONT MOVES SLOWLY
SOUTHEAST. THE ONLY CAVEAT IS THE TROPICAL SYSTEM IN THE GULF. MODEL
TIME-HEIGHT RELATIVE HUMIDITY ANALYSIS SHOWS LITTLE SUNSHINE THROUGH
MONDAY NIGHT. NUMBERS CLOSER TO MAV MOS LOOK BEST.

DAYS 4-7...DECIDED TO TREND TOWARD A CONSERVATIVE FORECAST FOR THESE
PERIODS. CONTINUED DRY FORECAST ALONG WITH PARTLY CLOUDY SKIES AND
TEMPERATURES NEAR SEASONAL AVERAGES.

THANKS TO FORT WORTH AND NEW BRAUNFELS FOR COORDINATION.

ABI 065/082/062/083/063 56411
SJT 065/083/063/085/063 85411
JCT 068/085/065/083/063 86421

.SJT...NONE.

23/HUBER

Hazardous weather outlook, Aug 30, 2:14 PM CDT, 1 hour 37 minutes before

TXZ049-054-064>066-071>073-076>078-098-099-113-114-127-128-139-140-
154-155-168>170-311915-

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE SAN ANGELO TX
214 PM CDT SAT AUG 30 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WEST CENTRAL TEXAS.

.DAY ONE...

A SLOW MOVING COLD FRONT WILL INTERACT WITH A MOIST TROPICAL AIRMASS
TO PRODUCE A CHANCE OF EXCESSIVE RAINFALL AND FLASH FLOODING.
NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND
TONIGHT ACROSS MUCH OF WEST CENTRAL TEXAS. RAINFALL AMOUNTS OF ONE
TO TWO INCHES COULD OCCUR AT SOME LOCATIONS...WITH ISOLATED AMOUNTS
OVER THREE INCHES POSSIBLE. A FEW STRONG THUNDERSTORMS ARE POSSIBLE
WITH WIND GUSTS TO 45 MPH AND FREQUENT LIGHTNING.

.DAYS TWO THROUGH SEVEN...

THE THREAT OF LOCALLY HEAVY RAINS WILL LINGER SUNDAY...AS THE FRONT
MOVES SOUTH. AREAS SOUTH OF A SAN ANGELO...SAN SABA LINE HAVE THE
GREATEST POTENTIAL OF LOCALLY HEAVY RAINFALL.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

19

Nearby

Flash Flood Warnings in Texas, 2003 Every flash flood warning in 2003

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.