Alert archive / South Carolina / Flash Flood Warnings in 1990

Flash Flood Warning 11, NWS Columbia, SC

October 11, 1990Lancaster County, South Carolina

NWS Columbia, SC issued this flash flood warning at Oct 11, 1990, 2:22 PM EDT for Lancaster County, South Carolina. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Oct 11, 1990, 2:22 PM EDT (18:22 UTC)
Expired
Oct 11, 1990, 6:30 PM EDT
In force
4 hr
Issued by
NWS Columbia, SC
Area
Whole counties

County Lancaster 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 6.4 hours before the alert went out and 171 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, Greensboro/Hi Pt, NC at 12:00Z on 1990-10-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 36 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, Greensboro/Hi Pt, NC at 12:00Z on 1990-10-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.19395878Sfc1 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
36 J/kg
Mixed-layer CIN
-141 J/kg
Mixed-layer LCL
559 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
109 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 KCAE 111822
FFWCAE
SCC027-055-057-061-085-112230-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE COLUMBIA SC
222 PM EDT THU OCT 11 1990
 
THE NATIONAL WEATHER SERVICE IN COLUMBIA HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  630 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN  SOUTH CAROLINA
 
   ...CLARENDON COUNTY...KERSHAW COUNTY...LANCASTER COUNTY...LEE COUNT   ...SUMTER COUNTY
 
MODERATE TO HEAVY RAINS PERSIST OVER THE MIDLANDS OF SOUTH
CAROLINA..AND REPORTS FROM EMERGENCY MANAGEMENT OFFICICLAS INDICATE
THAT SERIOUS FLOODING PROBLEMS CONTINUE IN THE ABOVE COUNTIES..SO THE
FLASH FLOOD WARNING HAS BEEN EXTENDED AND LANCASTER COUNTY HAS BEEN
ADDED.
 
IF YOU LIVE IN A FLOOD PRONE AREA IN THE AFFECTED COUNTIES..ESPECIALLY
WHERE RISING WATER IS ALREADY EVIDENT OR NEAR THE LOCAL DAMS..TAKE
PRECAUTIONS IMMEDIATELY. IF FLOODING IS OBSERVED ACT QUICKLY. DO NOT
STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

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, 3:43 PM EDTFlash Flood WarningCAECalhoun, Richland3 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.