Alert archive / Alabama / Flash Flood Warnings in 1991

Flash Flood Warning 5, NWS Mobile, AL

April 12, 1991Elmore County, Alabama

NWS Mobile, AL issued this flash flood warning at Apr 12, 1991, 8:46 PM CDT for Elmore County, Alabama. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Apr 12, 1991, 8:46 PM CDT (01:46 UTC)
Expired
Apr 13, 1991, 12:45 AM CDT
In force
4 hr
Issued by
NWS Mobile, AL
Area
Whole counties

County Elmore County, AL

The nearest sounding before it

Centreville/Bibb, AL (KCKL), launched 00:00Z, 1.8 hours before the alert went out and 104 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, Centreville/Bibb, AL at 00:00Z on 1991-04-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1388 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, Centreville/Bibb, AL at 00:00Z on 1991-04-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 119 square meters per square second.193958Sfc1 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
1388 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
861 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
119 m²/s²
0-3 km storm-relative helicity
187 m²/s²
Significant tornado parameter
0.9
Supercell composite
5.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMGM 130148
FFWMGM
ALC051-130545-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MONTGOMERY AL
846 PM CDT FRI APR 12 1991
 
THE NATIONAL WEATHER SERVICE IN MONTGOMERY HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1245 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH ALABAMA
 
   ...ELMORE COUNTY
 
WEATHER RADAR AT MONTGOMERY HAS CONTINUED TO OBSERVE HEAVY RAINS
FALLING IN ELMORE COUNTY FROM A SERIES OF THUNDERSTORMS. THE STATE
PATROL REPORTS NUMEROUS ROADS COVERED WITH WATER AND A NUMBER OF
CLOSINGS. WATER WILL CONTINUE TO RISE AS RUNOFF FEEDS STREAMS AND
CANYONS.
 
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.

The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 12, 7:42 PM CDTSevere Thunderstorm WarningMOBElmore63 min
Apr 12, 8:21 PM CDTFlash Flood WarningMOBCoosa4 hr

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.