Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 55, NWS San Angelo, TX

July 7, 2002Sutton County, Texas

NWS San Angelo, TX issued this flash flood warning at Jul 7, 2002, 1:28 AM CDT for Sutton County, Texas. It was in force for 6 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
Jul 7, 2002, 1:28 AM CDT (06:28 UTC)
Expired
Jul 7, 2002, 7:00 AM CDT
In force
6 hr
Issued by
NWS San Angelo, TX
Area
Counties, with a storm outline in the text

County Sutton 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

Del Rio, TX (KDRT), launched 00:00Z, 6.5 hours before the alert went out and 131 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 00:00Z on 2002-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2947 joules per kilogram.LCLEL10008507005003002001001 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 00:00Z on 2002-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 square meters per square second.1939Sfc1 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
2947 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1452 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.1

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KSJT 070628
FFWSJT
TXC435-071200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
130 AM CDT SUN JUL 7 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SUTTON COUNTY IN SOUTHWEST TEXAS

* UNTIL 700 AM CDT

* AT 115 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY       
  HEAVY RAIN 11 MILES SOUTHEAST OF SONORA...MOVING NORTH AT 5 MPH.
  THUNDERSTORMS WITH HEAVY RAIN WERE ALSO MOVING INTO THE CAVERNS OF 
  SONORA VICINITY.

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE NEAR...
   SONORA AT 235 AM CDT

* RAINFALL TOTALING 2 TO 3 INCHES HAS FALLEN 10 MILES EAST AND       
  SOUTHEAST OF SONORA. 1 INCH HAS FALLEN IN SONORA THIS EVENING
  THESE STORMS WILL QUICKLY PRODUCE RAINFALL AMOUNTS OF 3 TO 5       
  INCHES IN 1 TO 2 HOURS. 

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.

LAT...LON 3068 10093 3031 10094 3031 10013 3070 10014

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 Jul 6, 3:15 PM CDT, 10 hours 13 minutes earlier.

Area forecast discussion, Jul 6, 3:15 PM CDT, 10 hours 13 minutes before
WEST CENTRAL TEXAS FORECAST DISCUSSION...CORRECTED CCF NUMBERS
NATIONAL WEATHER SERVICE SAN ANGELO TX
315 PM CDT SAT JUL 6 2002

CURRENT...WATER VAPOR IMAGERY GETS MY ATTENTION. UPPER-LEVEL LOW
OVER NEW MEXICO CONTINUES TO SLOWLY DRIFT SOUTHEAST PRODUCING
SHOWERS AND THUNDERSTORMS ACROSS WEST TEXAS. OVER THE BIG COUNTRY
AND NORTHEAST TOWARD THE RED RIVER...THE UPPER-LEVEL ANTICYCLONIC
SWIRL INDICATES THE TROPICAL SYSTEM IS STILL ALIVE.

DAYS 1-3...THIS SYSTEM OVER WEST CENTRAL TEXAS IS CLEARLY AN
ANOMALY. MODELS FROM THE 12 Z RUN THIS MORNING DID NOT INITIALIZE
WELL IN TERMS OF THE UPPER VORTICITY. FOR TONIGHT...BELIEVE THE BEST
APPROACH IS TO PLACE MORE WEIGHT ON PERSISTENCE AND MESOSCALE
ANALYSIS...INCLUDING WSR-88D DATA. MAIN CONCERN IS THE AMOUNT OF
RAINFALL WE HAVE HAD OVER THE NORTHEASTERN HALF OF OUR CWFA DURING
THE LAST 12 TO 18 HOURS. THUS...WILL GO WITH A FLASH FLOOD WATCH FOR
ALL THE BIG COUNTRY...THE NORTHEASTERN CONCHO VALLEY...AND THE
NORTHERN HEARTLAND TONIGHT. MODELS SUGGEST THE MAIN UPPER
VORTICITY...ALONG WITH THE GREATEST RAINFALL AMOUNTS...WILL EXTEND
FROM THE NORTHWESTERN BIG COUNTRY INTO THE TEXAS PANHANDLE.
HOWEVER...WE ARE CONCERNED WITH THE OLD MCV OVER THE BIG COUNTRY AND
ITS POTENTIAL FOR REDEVELOPMENT THERE TONIGHT. THUS...WILL GO WITH
AVN MOS GUIDANCE POPS OF 70 PERCENT FOR THE FLASH FLOOD WATCH
COUNTIES AND SLIGHTLY BELOW AVN MOS ELSEWHERE. FOR TOMORROW THROUGH
TUESDAY...WILL GRADUALLY DECREASE POPS ALL ZONES AS AVN GUIDANCE
SUGGESTS.

DAYS 4-7...WILL CONTINUE SLIGHT CHANCE FOR WEDNESDAY AND THURSDAY
WITH A DRY FORECAST BEYOND.

THANKS TO LBB AND FTW FOR COORDINATION.

CCF PRELIMS...

ABI 070/088 070/091 070 7432
SJT 070/090 070/093 070 5432
JCT 070/090 070/093 070 4322

.SJT...FLASH FLOOD WATCH TONIGHT FOR THESE COUNTIES...
       HASKELL...THROCKMORTON...FISHER...JONES...SHACKELFORD...
       NOLAN...TAYLOR...CALLAHAN...RUNNELS...COLEMAN...
       AND BROWN COUNTIES.

23/HUBER

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 10:14 PM CDTFlash Flood WarningSJTTom Green3 hr
Jul 7, 2:23 AM CDTFlash Flood WarningSJTCrockett4 hr
Jul 7, 6:23 AM CDTFlash Flood WarningSJTKimble6 hr
Jul 7, 2:48 PM CDTFlash Flood WarningSJTFisher117 min
Jul 7, 2:57 PM CDTFlash Flood WarningSJTFisher108 min
Jul 7, 3:03 PM CDTFlash Flood WarningSJTFisher102 min
Jul 7, 5:02 PM CDTFlash Flood WarningSJTFisher4 hr

Nearby

Flash Flood Warnings in Texas, 2002Every 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.