Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 120, NWS Austin/San Antonio, TX

July 6, 2002DeWitt County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 6, 2002, 3:52 PM CDT for DeWitt County, Texas. It was in force for 2 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 6, 2002, 3:52 PM CDT (20:52 UTC)
Expired
Jul 6, 2002, 6:00 PM CDT
In force
2 hr
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

County DeWitt County, TX

The radar

The Austin/San Antonio radar (KEWX), 90 km from the middle of the area, began a volume at 20:55 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

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

Corpus Christi, TX (KCRP), launched 12:00Z, 8.9 hours before the alert went out and 154 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, Corpus Christi, TX at 12:00Z on 2002-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3181 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, Corpus Christi, TX at 12:00Z on 2002-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
3181 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
561 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
22 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 KEWX 062052
FFWSAT
TXC123-062300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
355 PM CDT SAT JUL 6 2002

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES...
  DEWITT

* UNTIL 600 PM CDT

* AT 354 PM...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
  5 MILES NORTH OF CUERO...MOVING LITTLE.  DOPPLER RADAR ESTIMATES   
  OF ONE AND A HALF TO 2 INCHES PER HOUR FROM THIS STORM.   

* THE THUNDERSTORM WITH EXCESSIVE RAINFALL WILL BE...
RURAL DEWITT COUNTY AT 400 PM

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

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 2907 9756 2895 9752 2915 9710 2933 9722
1 follow-up statement
000 
WGUS74 KEWX 062118
FFSSAT
TXC123-062315-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
420 PM CDT SAT JUL 6 2002

...FLASH FLOOD WARNING IN EFFECT FOR DEWITT COUNTY TIL 6 PM CDT...

AT 420 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE VERY HEAVY RAINS OVER NORTH CENTRAL DEWITT COUNTY NORTH AND 
WEST OF CUERO. RAINFALL ESTIMATES OF ONE AND A HALF TO TWO INCHES 
PER HOUR IN THESE STORMS.  RADAR SHOWED LITTLE IN THE WAY OF 
MOVEMENT.

SECONDARY ROADS AND LOW WATER CROSSINGS WILL FLOOD THE NEXT FEW 
HOURS.  MOTORISTS SHOULD NOT ENTER FLOODED LOW WATER 
CROSSINGS...THEY CAN BE FATAL. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. 
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO 
HIGHER GROUND. STAY TUNED TO LOCAL MEDIA OUTLETS FOR THE LATEST 
WEATHER INFORMATION.

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 Austin/San Antonio, TX wrote its last area forecast discussion before this flash flood warning went out at Jul 6, 3:11 PM CDT, 41 minutes earlier.

Area forecast discussion, Jul 6, 3:11 PM CDT, 41 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
300 CDT SAT JUL 06 2002
I
UPON FUTHER THOUGHT...IT APPEARS THAT BROKEN LINE OF THUNDERSTORMS
UP FROM COAST WILL NOT HAVE ENOUGH DYNAMICS TO SUSTAIN MUCH PAST
DARK.  SO...WILL READJUST THINKING AND CONTINUE FLASH FLOOD WATCH
FOR TONIGHT FOR JUST NORTHWESTERN AREAS...GIVEN THE CHANCE FOR SOME
GOOD RAINS THERE WITH A VORT MAX AS DISPLAYED BY MESO-ETA MODEL.
HOPEFULLY...A DECREASE IN ACTIVITY SUNDAY THROUGH MONDAY.  THEN MORE
SHOWERS MAINLY SE HALF TUESDAY.  TEMPS CLOSE TO GUIDANCE.

PRELIMINARY NUMBERS...
AUS 072 092 071 092 3221
DRT 077 093 075 093 4321
SAT 075 092 075 092 3221

.EWX...FLASH FLOOD TONIGHT FOR THE HILL COUNTRY AND ADJACENT PARTS
       OF EDWARDS PLATEAU.

3/2/KW

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 6, 6:08 PM CDTFlash Flood WarningEWXBandera, Blanco, Burnet, Comal, Gillespie, Hays and 4 more4 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; radar from the NEXRAD Level II archive.