Alert archive / Alabama / Flash Flood Warnings in 1991

Flash Flood Warning 11, NWS Mobile, AL

August 13, 1991Houston County, Alabama

NWS Mobile, AL issued this flash flood warning at Aug 13, 1991, 4:26 PM CDT for Houston County, Alabama. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 13, 1991, 4:26 PM CDT (21:26 UTC)
Expired
Aug 13, 1991, 7:30 PM CDT
In force
3 hr
Issued by
NWS Mobile, AL
Area
Whole counties

County Houston County, AL

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.4 hours before the alert went out and 127 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, Tallahassee Rgnl, FL at 12:00Z on 1991-08-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1702 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tallahassee Rgnl, FL at 12:00Z on 1991-08-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
1702 J/kg
Mixed-layer CIN
-18 J/kg
Mixed-layer LCL
765 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
59 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 KMGM 132130
FFWMGM
ALC069-140030-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MONTGOMERY AL
426 PM CDT TUE AUG 13 1991
 
THE NATIONAL WEATHER SERVICE IN MONTGOMERY HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  730 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH ALABAMA
 
   ...HOUSTON COUNTY
 
NUMEROUS THUNDERSTORMS HAVE BEEN MOVING THROUGH A LINE WHICH IS
VIRTUALLY STATIONARY JUST SOUTH OF DOTHAN. THIS HAS CAUSED FLOODING OF
MANY COUNTY ROADS IN THE AREA ACCORDING TO THE HOUSTON COUNTY
EMERGENCY MANAGEMENT AGENCY.
 
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 SdAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 13, 11:45 AM CDT, 4 hours 41 minutes before
ALZ016-MSZ013-131745-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOBILE AL
1143 AM CDT TUE AUG 13 1991

...A FEW STRONG THUNDERSTORMS FOR THE MISSISSIPPI AND ALABAMA COASTAL
COUNTIES FOR THE AFTERNOON...

AT 1135 AM THE MOBILE RADAR INDICATED A FEW STRONG THUNDERSTORMS
DEVELOPING OVER SOUTHERN MOBILE COUNTY ABOUT 10 TO 15 MILES SOUTH OF
THE MOBILE AIRPORT.  THE THUNDERSTORMS ARE DEVELOPING ALONG A SEA
BREEZE FRONT WHICH IS ENHANCED BY THE PRESENCE OF A WEAK COLD FRONT IN
THE AREA.  FOR THIS REASON THE THUNDERSTORMS WILL BECOME QUITE STRONG
THIS AFTERNOON WITH STRONG GUSTY WINDS...LOTS OF DANGEROUS LIGHTNING
...VERY HEAVY RAINFALL AND POSSIBLE HAIL.

THE THUNDERSTORMS WILL EXTEND WESTWARD INTO THE MISSISSIPPI COASTAL
COUNTIES AND EAST INTO BALDWIN COUNTY ALABAMA.  LITTLE MOVEMENT WAS
INDICATED BY RADAR BUT A SLIGHT NORTHEAST DRIFT IS LIKELY AS THE
STORMS CONTINUE TO FORM.

RESIDENTS IN THE MISSISSIPPI AND ALABAMA COASTlAL COUNTIES SHOULD BE
ALERT FOR THE PRESENCE OF THESE THUNDERSTORMS AND PLAN TO BE INDOORS
IF A STORM APPROACHES.

IF THE STORMS DRIFT OVER MOBILE BAY OR THE IMMEDIATE COASTAL WATERS...
MARINE WARNINGS WILL LIKELY BE ISSUED.

Nearby

Flash Flood Warnings in Alabama, 1991Every flash flood warning in 1991

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.