Alert archive / Tennessee / Flash Flood Warnings in 1991

Flash Flood Warning 21, NWS Memphis, TN

May 12, 1991Fayette County, Shelby County, Tennessee; Benton County, Marshall County, Mississippi

NWS Memphis, TN issued this flash flood warning at May 12, 1991, 2:37 PM CDT for Fayette County, Shelby County, Tennessee; Benton County, Marshall County, Mississippi. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
May 12, 1991, 2:37 PM CDT (19:37 UTC)
Expired
May 12, 1991, 5:45 PM CDT
In force
3 hr
Issued by
NWS Memphis, TN
Area
Whole counties

Counties Benton County, MS, Marshall County, MS, Fayette County, TN, Shelby County, TN

The nearest sounding before it

Paducah/Barkley, KY (KPAH), launched 12:00Z, 7.6 hours before the alert went out and 242 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, Paducah/Barkley, KY at 12:00Z on 1991-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 915 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Paducah/Barkley, KY at 12:00Z on 1991-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 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
915 J/kg
Mixed-layer CIN
-22 J/kg
Mixed-layer LCL
669 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
108 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMEM 121937
FFWMEM
MSC009-093-TNC047-157-122245-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
237 PM CDT SUN MAY 12 1991
 
THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  545 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH CENTRAL MISSISSIPPI
 
   ...BENTON COUNTY
 
IN NORTHWEST MISSISSIPPI
 
   ...MARSHALL COUNTY
 
 
IN WEST TENNESSEE
 
   ...FAYETTE COUNTY...SHELBY COUNTY
 
AT 230 PM WEATHER RADAR SHOWED THUNDERSTORMS WITH VERY HEAVY RAIN
COVERED MOST OF SHELBY COUNTY TENNESSEE...ALONG WITH MARSHALL AND
BENTON COUNTIES OF NORTH MISSISSIPPI. THE STORMS WERE MOVING VERY
SLOWLY TOWARD THE SOUTHEAST AND WERE PRODUCING RAINFALL IN EXCESS OF
TWO INCHES PER HOUR.
 
MANY ROADS IN BOTH SHELBY AND FAYETTE COUNTY TENNESSEE WERE COVERED
WITH WATER...SOME IMPASSABLE...AND WATER WAS STARTING TO THREATEN
BUSINESSES AND HOMES IN EAST SHELBY AND WEST FAYETTE COUNTIES.
 
THE THUNDERSTORMS ARE EXPECTED TO WEAKEN AS THE AFTERNOON WANES...BUT
IT WILL TAKE A CONSIDERABLE AMOUNT OF TIME BEFORE THE WATER RUNS INTO
STREAMS AND DRAINAGES.
 
BE ESPECIALLY CAREFUL IF YOU WILL BE DRIVING.  HIGH WINDS AND THE VERY
HEAVY RAIN MAKES VISIBILITY DIFFICULT AND YOU MIGHT DRIVE INTO WATER
THAT IS DEEP ENOUGH TO DROWN YOU.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT T\O 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 Memphis, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 12, 12:01 AM CDTSevere Thunderstorm WarningMEGLauderdale29 min
May 12, 1:36 PM CDTFlash Flood WarningMEGFayette2 hr
May 12, 3:01 PM CDTFlash Flood WarningMEGHardeman, Haywood3 hr
May 12, 7:23 AM CDTSevere Thunderstorm WarningMEGBenton, Marshall67 min
May 12, 12:20 PM CDTSevere Thunderstorm WarningMEGItawamba, Monroe25 min
May 12, 4:13 PM CDTFlash Flood WarningMEGPontotoc4 hr
May 12, 4:54 PM CDTFlash Flood WarningMEGLee, Monroe4 hr

Nearby

Flash Flood Warnings in Tennessee, 1991Flash Flood Warnings in Mississippi, 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.