Alert archive / Texas / Flash Flood Warnings in 1986

Flash Flood Warning 3, NWS Austin/San Antonio, TX

May 9, 1986Val Verde County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 9, 1986, 4:35 PM CDT for Val Verde County, Texas. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
May 9, 1986, 4:35 PM CDT (21:35 UTC)
Expired
May 9, 1986, 8:35 PM CDT
In force
4 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Val Verde County, TX

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 9.6 hours before the alert went out and 66 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 1986-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2443 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 12:00Z on 1986-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 144 square meters per square second.1939587897Sfc1 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
2443 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
574 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
144 m²/s²
0-3 km storm-relative helicity
201 m²/s²
Significant tornado parameter
2.2
Supercell composite
11.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDRT 092135
FFWDRT
TXC465-100135-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DEL RIO TX
435 PM CDT FRI MAY 9 1986
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 835 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY IN

SOUTH CENTRAL TEXAS...VAL VERDE.

SIX FEET OF WATER HAS BEEN REPORTED ACROSS HIGHWAY 163 AT THE MAYFIELD
STORE.

THE HIGHWAY DEPARTMENT HAS CLOSED HIGHWAY 163 IN VAL VERDE COUNTY.
OTHER MINOR ROADS ARE PROBABLY IMPASSABLE IN THE NORTHERN PART OF THE
COUNTY. MOTORISTS SHOULD AVOID THESE AREAS. 

 AT 430 PM CDT RADAR INDICATES THUNDERSTORM ACTIVITY IN EXTREME
NORTHEAST VAL VERDE COUNTY WITH THE HEAVIEST THUNDERSTORMS NORTH OF
THE VAL VERDE COUNTY LINE. SOME LOCATIONS IN THE NORTHERN PART OF THE
COUNTY REPORTED UP TO 4 1/2 INCHES OF RAIN EARLY THIS MORNING.
 
MOTORISTS TRAVELING IN NORTHERN VAL VERDE COUNTY SHOULD EXERCISE
EXTREME CAUTION WHEN APPROACHING LOW WATER CROSSINGS.

PERSONS ON THE DEVILS RIVER AND IN THE NORTHERN PART OF VAL VERDE
COUNTY SHOULD MOVE TO HIGHER GROUND. 

A FLASH FLOOD WARNING MEANS THAT FLOODING IS INMINENT OR HAS BEEN
REPORTED. TAKE ANY NEEDED PROTECTIVE ACTION NOW. REPORT ANY 0FLOODING
TO THE NEAREST LAW ENFORCEMENT AGENCY AND ASK THEM TO RELAY TO THE
NEAREST NATIONAL WEATHER SERVICE OFFICE.

The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 7:28 PM CDTSevere Thunderstorm WarningEWXMills62 min
May 8, 7:31 PM CDTSevere Thunderstorm WarningEWXWebb59 min
May 9, 3:22 PM CDTSevere Thunderstorm WarningEWXEdwards, Real68 min
May 9, 3:34 PM CDTSevere Thunderstorm WarningEWXKerr56 min
May 9, 4:04 PM CDTSevere Thunderstorm WarningEWXUvalde56 min
May 9, 4:48 PM CDTFlash Flood WarningEWXKerr4 hr

Nearby

Flash Flood Warnings in Texas, 1986Every flash flood warning in 1986

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.