Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 76, NWS San Angelo, TX

July 30, 2002Jones County, Texas

NWS San Angelo, TX issued this flash flood warning at Jul 30, 2002, 3:57 AM CDT for Jones County, Texas. It was in force for 4 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 30, 2002, 3:57 AM CDT (08:57 UTC)
Expired
Jul 30, 2002, 8:00 AM CDT
In force
4 hr
Issued by
NWS San Angelo, TX
Area
Counties, with a storm outline in the text

County Jones 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 00:00Z, 9.0 hours before the alert went out and 239 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, Fort Worth, TX at 00:00Z on 2002-07-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2446 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, Fort Worth, TX at 00:00Z on 2002-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
2446 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1282 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
52 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 300857
FFWSJT
TXC253-301300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANGELO TX
355 AM CDT TUE JUL 30 2002

THE NATIONAL WEATHER SERVICE HAS ISSUED A

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

* UNTIL 800 AM CDT

* AT 352 AM CDT...WEATHER SERVICE DOPPLER RADAR INDICATED VERY 
  HEAVY RAIN OVER CENTRAL AND EASTERN JONES COUNTY.

* RAINFALL TOTALING 2 TO 4 INCHES HAS FALLEN IN THE WARNED 
  AREA...WITH ADDITIONAL RAINFALL UP TO 2 INCHES EXPECTED THROUGH    
  800 AM CDT

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 3293 10000 3254 9998 3254 9963 3294 9962
1 follow-up statement
000 
WGUS74 KSJT 301130
FFSSJT
TXC253-301145-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN ANGELO TX
630 AM CDT TUE JUL 30 2002

...THE NATIONAL WEATHER SERVICE IN SAN ANGELO HAS CANCELLED THE FLASH
FLOOD WARNING FOR JONES COUNTY...

AT 630 AM CDT...ONLY LIGHT RAIN IS EXPECTED OVER JONES COUNTY AND 
THE THREAT OF FLOODING HAS ENDED...THEREFORE THE FLASH FLOOD WARNING 
FOR JONES COUNTY HAS BEEN CANCELLED.

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 30, 2:30 AM CDT, 1 hour 27 minutes earlier.

Area forecast discussion, Jul 30, 2:30 AM CDT, 1 hour 27 minutes before
WEST CENTRAL TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN ANGELO TX
230 AM CDT TUE JUL 30 2002

NEW CONVECTION DEVELOPING ACROSS WEST CENTRAL TEXAS NORTH OF DECAYING
MCS NEAR DEL RIO. STORMS EAST OF ABILENE AND NEAR JUNCTION PRODUCING
HOURLY RAINFALL AMOUNTS OF 1 INCH OR BETTER. NO SURPRISE WITH SURFACE
DEWPOINTS AROUND 70 F AND PWAT VALUES NEAR 2.00 INCHES...PER 00Z DEL
RIO RAOB. TROPICAL LIKE AIRMASS REMINISCENT OF EARLY JULY. MAIN
SUPPORT FOR STORMS COMING FROM UPPER LEVEL SHEAR AXIS...WHICH HAS
REMAINED PARKED OVER THE AREA SINCE SUNDAY. LOW LEVEL JET HAS ALSO
INCREASED TO 30 KTS...PER KSJT VAD. BRIEFLY CONSIDERED HOSTING A
FLASH FLOOD WATCH FOR TODAY...BUT DOPPLER RADAR STORM TOTAL ESTIMATES
INDICATE HEAVY RAINFALL SPOTTY SINCE SUNDAY. WE/LL MENTION LOCALLY
HEAVY RAINFALL. MOS IN BALLPARK TODAY AND TONIGHT WITH EXTENSIVE
CLOUD COVER AND SCT TRW. MORE SUNSHINE ON WEDNESDAY...SO LOWER 90S
IN ORDER. WITH THE MAJORITY OF THE NCEP MODELS DEPICTING A SLOWER
BREAKDOWN OF THE UPPER SHEAR AXIS...HAVE EXTENDED POPS INTO
WEDNESDAY. THEREAFTER...UPPER HEIGHTS ON THE RISE AGAIN...SO BACK TO
A MORE TYPICAL SUMMER TIME PATTERN.

CCF PRELIMS...

ABI 088/073/092/072  5320
SJT 087/072/093/071  5320
JCT 086/073/092/072  5320

.SJT...NONE.

17

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 2:40 AM CDTFlash Flood WarningSJTCallahan, Shackelford4 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.