Alert archive / South Carolina / Flash Flood Warnings in 1990

Flash Flood Warning 12, NWS Columbia, SC

October 11, 1990Calhoun County, Richland County, South Carolina

NWS Columbia, SC issued this flash flood warning at Oct 11, 1990, 3:43 PM EDT for Calhoun County, Richland County, South Carolina. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Oct 11, 1990, 3:43 PM EDT (19:43 UTC)
Expired
Oct 11, 1990, 6:45 PM EDT
In force
3 hr
Issued by
NWS Columbia, SC
Area
Whole counties

Counties Calhoun County, SC, Richland County, SC

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

Charleston AFB, SC (KCHS), launched 12:00Z, 7.7 hours before the alert went out and 131 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, Charleston AFB, SC at 12:00Z on 1990-10-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 38 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 1990-10-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.19395878Sfc1 km3 km6 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
38 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
640 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
-26 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCAE 111947
FFWCAE
SCC017-079-112245-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
343 PM EDT THU OCT 11 1990
 
THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  645 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN  SOUTH CAROLINA
 
   ...CALHOUN COUNTY...EASTERN RICHLAND COUNTY
 
MODERATE TO HEAVY RAINS ARE PERSISTING OVER THESE COUNTIES AND SOME
ROADS REMAIN CLOSED IN CALHOUN COUNTY. THE GROUND IS SATURATED AND
FLOODING IN THESE COUNTIES REMAIN A REAL POSSIBILITY.
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 Columbia, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 10, 9:45 PM EDTFlash Flood WarningCAEBamberg, Orangeburg6 hr
Oct 10, 9:45 PM EDTFlash Flood WarningCAEKershaw, Lancaster, Richland, Sumter6 hr
Oct 10, 9:45 PM EDTFlash Flood WarningCAECalhoun6 hr
Oct 11, 11:41 AM EDTFlash Flood WarningCAEKershaw, Lee, Sumter3 hr
Oct 11, 11:41 AM EDTFlash Flood WarningCAEClarendon3 hr
Oct 11, 1:07 PM EDTFlash Flood WarningCAECalhoun, Richland3 hr
Oct 11, 2:22 PM EDTFlash Flood WarningCAEClarendon, Kershaw, Lee, Sumter4 hr
Oct 11, 2:22 PM EDTFlash Flood WarningCAELancaster4 hr

Nearby

Flash Flood Warnings in South Carolina, 1990Every flash flood warning in 1990

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.