Alert archive / Texas / Flash Flood Warnings in 1987

Flash Flood Warning 2, NWS Houston/Galveston, TX

June 12, 1987Walker County, Texas

NWS Houston/Galveston, TX issued this flash flood warning at Jun 12, 1987, 6:49 AM CDT for Walker County, Texas. It was in force for 116 min.

The area

The counties it named.

The facts

Issued
Jun 12, 1987, 6:49 AM CDT (11:49 UTC)
Expired
Jun 12, 1987, 8:45 AM CDT
In force
116 min
Issued by
NWS Houston/Galveston, TX
Area
Whole counties

County Walker 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

Longview/Gregg, TX (KGGG), launched 00:00Z, 11.8 hours before the alert went out and 201 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, Longview/Gregg, TX at 00:00Z on 1987-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 478 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, Longview/Gregg, TX at 00:00Z on 1987-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 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
478 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
781 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
43 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 KHOU 121149
FFWHOU
TXC471-121345-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HOUSTON TX
649 AM CDT FRI JUN 12 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL  845 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTHEAST TEXAS
          ...WALKER
 
THE WALKER COUNTY SHERIFF DEPARTMENT REPORTED UP TO 10 INCHES OF
WATER ON HIGHWAY 19...ALSO FM 980 IS IMPASSIBLE AT THE FM 247
JUNCTION AND FM16996 IS IMPASSIBLE WEST OF FM 2550.
 
WESTHER SERVICE RADAR INDICATED SCATTERED SHOWERS AND THUNDERSHOWERS
OVER EAST WARKER COUNTY MOVING TO THE NORTHEAST AT 15 MPH.
 
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.

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 12, 2:50 PM CDTFlash Flood WarningHGXFort Bend, Harris115 min
Jun 12, 4:45 PM CDTFlash Flood WarningHGXHarris3 hr

Nearby

Flash Flood Warnings in Texas, 1987Every flash flood warning in 1987

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.