Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 70, NWS Austin/San Antonio, TX

July 2, 2002Bexar County, Medina County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 2, 2002, 7:45 PM CDT for Bexar County, Medina 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 2, 2002, 7:45 PM CDT (00:45 UTC)
Expired
Jul 2, 2002, 11:45 PM CDT
In force
4 hr
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

Counties Bexar County, TX, Medina County, TX

The radar

The Austin/San Antonio radar (KEWX), 86 km from the middle of the area, began a volume at 00:46 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.

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 0.8 hours before the alert went out and 195 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 2002-07-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3349 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, Del Rio, TX at 00:00Z on 2002-07-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 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
3349 J/kg
Mixed-layer CIN
-5 J/kg
Mixed-layer LCL
867 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
1.2
Supercell composite
6.2

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 030045
FFWSAT
TXC029-325-030445-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
745 PM CDT TUE JUL 2 2002

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES...
  BEXAR
  MEDINA

* UNTIL 1145 PM CDT

* AT 745 PM...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
  FROM WEST BEXAR COUNTY TO SOUTHEAST MEDINA COUNTY WITH RAINFALL
  RATES OF 2 TO 4 INCHES PER HOUR.  
   
THE HEAVIEST RAINS FOR THE NEXT ONE TO TWO HOURS WILL BE FROM 
BETWEEN YANCEY AND DEVINE TO BETWEEN SEA WORLD AND CASTROVILLE...AND 
ALSO NEAR HELOTES.   THE SLOW MOVEMENT AND WARM MOIST INFLOW WILL 
RESULT IN THE POTENTIAL FOR ADDITIONAL HEAVY RAIN AND 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. 

LAT...LON 2954 9923 2914 9931 2913 9888 2935 9881
          2919 9845 2946 9821 2959 9851
1 follow-up statement
000 
WGUS74 KEWX 030402
FFSSAT
TXC029-163-259-325-030445-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1054 PM CDT TUE JUL 2 2002

...A FLASH FLOOD WARNING CONTINUES FOR KENDALL...BEXAR...MEDINA AND 
FRIO COUNTIES UNTIL 1145 PM CDT...

...FLASH FLOOD WATCH IN EFFECT THROUGH TONIGHT ALL OF SOUTH CENTRAL 
TEXAS AND THE HILL COUNTRY...

AT 1055 PM...THUNDERSTORMS WITH HEAVY RAINFALL CONTINUE OVER 
NORTHWEST BEXAR COUNTY...NORTHEAST MEDINA COUNTY...SOUTHWEST KENDALL
COUNTY AND NORTHWEST AND WEST FRIO COUNTY. RAINFALL RATES OF 1 TO 3 
INCHES PER HOUR ARE OCCURRING.

THE TROPICAL AIRMASS OVER SOUTH CENTRAL TEXAS IS PROVIDING THE 
MOISTURE NEEDED IN THE DEVELOPMENT OF THESE STORMS. ADDITIONAL 
THUNDERSTORM AND HEAVY RAIN ARE EXPECTED THROUGH THE NIGHT.  

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE ADDITIONAL FLOODING.
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD. 

STAY TUNED TO LOCAL MEDIA OUTLETS FOR THE LATEST WEATHER INFORMATION.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 2, 8:23 PM CDTFlash Flood WarningEWXKendall3 hr
Jul 2, 8:30 PM CDTFlash Flood WarningEWXFrio3 hr
Jul 2, 9:32 PM CDTSevere Thunderstorm WarningEWXFrio58 min
Jul 2, 10:50 PM CDTFlash Flood WarningEWXDimmit, Zavala3 hr
Jul 2, 11:27 PM CDTFlash Flood WarningEWXBandera, Bexar, Medina4 hr
Jul 3, 1:57 AM CDTFlash Flood WarningEWXDimmit, Zavala4 hr
Jul 3, 3:05 AM CDTFlash Flood WarningEWXAtascosa, Bandera, Bexar, Blanco, Comal, Frio and 2 more4 hr
Jul 3, 5:12 AM CDTFlash Flood WarningEWXAtascosa, Bandera, Bexar, Blanco, Comal, Dimmit and 9 more7 hr
Jul 3, 9:06 AM CDTFlash Flood WarningEWXBurnet, Williamson3 hr
Jul 3, 9:47 AM CDTFlash Flood WarningEWXReal2 hr
Jul 3, 11:51 AM CDTFlash Flood WarningEWXDimmit, Zavala3 hr
Jul 3, 11:54 AM CDTFlash Flood WarningEWXBurnet, Williamson3 hr
Jul 3, 12:46 PM CDTSevere Thunderstorm WarningEWXVal Verde59 min
Jul 3, 1:16 PM CDTFlash Flood WarningEWXBandera, Medina119 min
Jul 3, 2:38 PM CDTFlash Flood WarningEWXKendall, Kerr3 hr
Jul 3, 2:52 PM CDTFlash Flood WarningEWXReal, Uvalde3 hr
Jul 3, 3:19 PM CDTFlash Flood WarningEWXBandera, Medina2 hr
Jul 3, 5:38 PM CDTFlash Flood WarningEWXComal3 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.