Alert archive / Texas / Flash Flood Warnings in 2002

Flash Flood Warning 45, NWS Austin/San Antonio, TX

July 1, 2002Medina County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jul 1, 2002, 4:09 PM CDT for Medina County, Texas. It was in force for 3 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 1, 2002, 4:09 PM CDT (21:09 UTC)
Expired
Jul 1, 2002, 7:00 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

County Medina County, TX

The radar

The Austin/San Antonio radar (KEWX), 91 km from the middle of the area, began a volume at 21:09 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 12:00Z, 9.2 hours before the alert went out and 186 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 12:00Z on 2002-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 676 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Del Rio, TX at 12:00Z on 2002-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -17 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
676 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
625 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-17 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 KEWX 012109
FFWSAT
TXC325-020000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
406 PM CDT MON JUL 1 2002

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

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

* UNTIL 700 PM CDT

* AT 406 PM...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
  OVER THE RIOMEDINA...CASTROVILLE...AND LACOSTE AREAS WITH RAINFALL
  RATES OF 1 TO 2 INCHES PER HOUR.  THE RAINS WERE MOVING SLOWLY TO
  THE NORTHEAST AT 5 MPH.  THE SOILS ARE SATURATED FROM PREVIOUS
  RAINS AND RUNOFF WILL BE RAPID AND CAUSE FLASH FLOODING.

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 2927 9898 2924 9882 2971 9882 2956 9893
          2960 9900
1 follow-up statement
000 
WGUS74 KEWX 012216
FFSSAT
TXC325-012315-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
516 PM CDT MON JUL 1 2002

...THE FLASH FLOOD WARNING FOR MEDINA COUNTY HAS BEEN CANCELLED...

NATIONAL WEATHER SERVICE RADAR INDICATED THE RAINFALL HAS MOVED EAST 
INTO BEXAR COUNTY...AND THE FLOOD THREAT WAS DIMINISHING. SOME MINOR 
FLOODING MAY CONTINUE AS SMALL STREAMS CONTINUE TO RUN HIGH AND 
WATER PONDS IN LOW LYING AREAS.  THE THREAT OF SERIOUS FLOODING HAS 
ENDED...AND THE FLASH FLOOD WARNING HAS BEEN CANCELLED.

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 4:28 AM CDTFlash Flood WarningEWXBexar2 hr
Jul 1, 6:36 AM CDTFlash Flood WarningEWXBexar3 hr
Jul 1, 6:56 AM CDTFlash Flood WarningEWXGonzales, Guadalupe2 hr
Jul 1, 7:48 AM CDTFlash Flood WarningEWXAtascosa117 min
Jul 1, 8:50 AM CDTFlash Flood WarningEWXFrio3 hr
Jul 1, 9:31 AM CDTFlash Flood WarningEWXAtascosa, Bexar2 hr
Jul 1, 12:07 PM CDTFlash Flood WarningEWXDimmit, Zavala3 hr
Jul 1, 12:12 PM CDTFlash Flood WarningEWXAtascosa, Bexar, Frio3 hr
Jul 1, 3:22 PM CDTFlash Flood WarningEWXKendall3 hr
Jul 1, 5:02 PM CDTFlash Flood WarningEWXBexar3 hr
Jul 1, 6:20 PM CDTFlash Flood WarningEWXKendall115 min

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.