Alert archive / Texas / Flash Flood Warnings in 1986

Flash Flood Warning 64, NWS Austin/San Antonio, TX

October 5, 1986Val Verde County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Oct 5, 1986, 3:50 PM CDT for Val Verde County, Texas. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Oct 5, 1986, 3:50 PM CDT (20:50 UTC)
Expired
Oct 5, 1986, 7:45 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, 8.8 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 1986-10-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 831 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 1986-10-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 37 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
831 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
572 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
37 m²/s²
0-3 km storm-relative helicity
114 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 
TTAA00 KDRT 052050
FFWDRT
TXC465-060045-

BULLETIN - EBS ACTIVITATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DEL RIO TX
350 PM CDT SUN OCT 5  1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 745 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY IN

SOUTHCENTRAL TEXAS...VAL VERDE.

AT 330 PM CDT SHOWERS AND HEAVY THUNDERSTORMS CONTINUED FROM 30
MILES SOUTHWEST OF DEL RIO NORTH ACROSS THE EASTERN HALF OF VAL
VERDE COUNTY...NORTHEAST TO SONORA...THEN BACK SOUTHEAST TO
ROCKSPRINGS. THE STRONGEST THUNDERSTORMS WERE SOUTH OF DEL RIO AND
IN THE ROCKSPRINGS AREA.

FROM 6 TO 10 INCHES OF RAIN HAS BEEN REPORTED ACROSS MOST OF
NORTHERN VAL VERDE COUNTY WITH WIDE SPREAD FLOODING ALONG THE DEVILS
RIVER. IT IS STILL RANING STEADY ACROSS THAT SAME AREA.
HIGHWAYS 163 AND 189 ARE CLOSED WITH THE ROAD WASHED OUT BY MAYFIELD
STORE JUST SOUTH OF JUNO ON HIGHWAY 163. THE DEVILS RIVER IS EXPECTED
TO CREST NEAR 16 FEET AT BAKERS CROSSING SOMETIME TONIGHT. IT IS AT 8
FEET AND RISING NOW.

FLOOD STAGE ON THE DEVILS RIVER IS 12 FEET SO LOWLAND FLOODING WILL
OCCUR. RANCHERS SHOULD MOVE LIVESTOCK TO HIGHER GROUND IMMEDIATELY.

AS RAIN CONTINUES  ACROSS MOST OF THE COUNTY NOW AND IS EXPECTED TO
CONTINUE THROUGH THE NIGHT THE FLOODING PROBLEM WILL BECOME MORE
SEVERE.

MOTORISTS ARE ADVISED NOT TO GO NORTH ON HIGHWAY 163 AND TO USE
EXTREME CAUTION AND REMAIN ALERT IF TRAVELING NORTH THROUGHOUT  VAL
VERDE COUNTY TODAY. PARENTS SHOULD CLOSELY MONITOR CHILDREN PLAYING
NEAR SWIFTLY MOVING WATERS.

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 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.

A FLASH FLOOD WATCH CONTINUES IN EFFECT FOR THE TEXAS HILL COUNTRY
AND ADJACENT EDWARDS PLATEAU NORTHWEST OF A EAGLE PASS...KERRVILL
...LLANO LINE. PERSONS WITHIN THE WATCH AREA SHOULD CONTINUE TO
MONITOR NATIONAL WEATHER SERVICE RADIO...LOCAL RADIO STATIONS AND TV
BROADCASTS FOR LATER INFORMATION.

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 5, 7:45 AM CDTFlash Flood WarningEWXVal Verde4 hr
Oct 5, 11:50 AM CDTFlash Flood WarningEWXVal Verde4 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.