Alert archive / Tennessee / Flash Flood Warnings in 2002

Flash Flood Warning 47, NWS Memphis, TN

September 20, 2002Shelby County, Tennessee; DeSoto County, Mississippi

NWS Memphis, TN issued this flash flood warning at Sep 20, 2002, 11:00 AM CDT for Shelby County, Tennessee; DeSoto County, Mississippi. It was in force for 90 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Sep 20, 2002, 11:00 AM CDT (16:00 UTC)
Expired
Sep 20, 2002, 12:30 PM CDT
In force
90 min
Issued by
NWS Memphis, TN
Area
Counties, with a storm outline in the text

Counties DeSoto County, MS, Shelby County, TN

The nearest sounding before it

Little Rock, AR (KLZK), launched 12:00Z, 4.0 hours before the alert went out and 37 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, Little Rock, AR at 12:00Z on 2002-09-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 465 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, Little Rock, AR at 12:00Z on 2002-09-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 134 square meters per square second.1939587897Sfc1 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
465 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
454 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
134 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KMEG 201600
FFWMEM
MSC033-TNC157-201730-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MEMPHIS TN
1058 AM CDT FRI SEP 20 2002

THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  DESOTO COUNTY IN NORTHWEST MISSISSIPPI
  SHELBY COUNTY IN SOUTHWEST TENNESSEE

* UNTIL 1230 PM CDT.

* AT 1052 AM CDT...WEATHER RADAR INDICATED VERY HEAVY RAIN FROM      
  MILLINGTON SOUTHWEST TOWARD EUDORA. RADAR RAINFALL ESTIMATES       
  DURING THE PAST HOUR RANGED FROM ONE TO ONE AND ONE-HALF INCHES    
  FROM THE LINE OF THUNDERSTORMS.

IN ADDITION...LOCAL EMA REPORTED ROADS BEGINNING TO BE COVERED BY 
WATER IN WALLS AND HORN LAKE. 

* CITIES AFFECTED THROUGH 1230 PM CDT INCLUDE...
  WHITEHAVEN...SOUTHWEST MEMPHIS...SOUTHEAST MEMPHIS...MILLINGTON...
  LAKELAND...GERMANTOWN...FRAYSER...ELLENDALE...DOWNTOWN MEMPHIS...
  BOLTON...BARTLETT...WALLS...SOUTHAVEN...OLIVE BRANCH...LYNCHBURG

.EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING.

.DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.

.STAY TUNED TO THIS NATIONAL WEATHER SERVICE BROADCAST FOR THE LATEST
UPDATES AND INFORMATION.

LAT...LON 3539 8968 3481 8975 3480 9022 3539 9008

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 20, 3:14 PM CDTSevere Thunderstorm WarningMEGTishomingo31 min
Sep 20, 3:36 PM CDTSevere Thunderstorm WarningMEGMonroe24 min
Sep 20, 4:03 PM CDTSevere Thunderstorm WarningMEGMonroe27 min

Nearby

Flash Flood Warnings in Tennessee, 2002Flash Flood Warnings in Mississippi, 2002Every flash flood warning in 2002

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.