Alert archive / South Carolina / Flash Flood Warnings in 2002

Flash Flood Warning 6, NWS Charleston, SC

August 30, 2002Charleston County, South Carolina

NWS Charleston, SC issued this flash flood warning at Aug 30, 2002, 10:00 AM EDT for Charleston County, South Carolina. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 30, 2002, 10:00 AM EDT (14:00 UTC)
Expired
Aug 30, 2002, 1:00 PM EDT
In force
3 hr
Issued by
NWS Charleston, SC
Area
Whole counties

County Charleston County, SC

The radar

The Charleston,SC radar (KCLX), 103 km from the middle of the area, began a volume at 14:02 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 2.0 hours before the alert went out and 18 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 2002-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 998 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, Charleston AFB, SC at 12:00Z on 2002-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 45 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
998 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
531 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
45 m²/s²
0-3 km storm-relative helicity
68 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.3

Open this sounding in Storm Lab

The text

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

000 
WGUS52 KCHS 301400
FFWCHS
SCC019-301700-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...DANGEROUS FLOODING IN DOWNTOWN CHARLESTON
NATIONAL WEATHER SERVICE CHARLESTON SC
1000 AM EDT FRI AUG 30 2002

THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CHARLESTON COUNTY IN SOUTHEAST SOUTH CAROLINA.

* UNTIL 100 PM EDT.

* AT 1000 AM EDT...EMERGENCY MANAGEMENT OFFICIALS REPORTED SIGNIFICANT
  FLOODING IN DOWNTOWN CHARLESTON WITH MANY STREETS FLOODED. HEAVY
  RAIN WILL SLOWLY DECREASE IN INTENSITY OVER THE NEXT HOUR HOWEVER
  ADDITIONAL RAINFALL WILL ONLY AGGRAVATE ONGOING FLOODING. ADDITIONAL
  THUNDERSTORMS ARE DEVELOPING OFF THE SOUTH CAROLINA COAST AND MOVING
  NORTH AT 15 TO 20 MPH. WITH HIGH TIDE APPROACHING...LONG TERM 
  SIGNIFICANT FLOODING IS POSSIBLE ACROSS ALL OF CHARLESTON COUNTY 
  THROUGH EARLY AFTERNOON.

* SOME LOCATIONS AFFECTED INCLUDE... 
  ADAMS RUN...AWENDAW...  CHARLESTON...CHARLESTON AIRPORT...EDISTO   
  ISLAND...HANAHAN...  HOLLYWOOD...JOHNS ISLAND...MCCLELLANVILLE...
  MEGGETT...MOUNT   PLEASANT...NORTH CHARLESTON...RAVENEL...
  SHADOWMOSS...WADMALAW   ISLAND...WEST ASHLEY AND YONGES ISLAND.

DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD MOST FLASH
FLOOD DEATHS OCCUR IN AUTOMOBILES.

$$

LAT...LON 3262 8036 3253 8032 3310 7932 3316 7946
          3282 7995 3297 8006 3280 8014 3283 8036

ST
3 follow-up statements
000 
WGUS72 KCHS 301448
FFSCHS
SCC019-301515-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
1048 AM EDT FRI AUG 30 2002

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CHARLESTON COUNTY UNTIL 
100 PM EDT...
...DANGEROUS AND SIGNIFICANT FLOODING CONTINUES IN DOWNTOWN 
CHARLESTON...

AT 1048 AM...RADAR INDICATED THAT THE HEAVIEST RAINS HAVE PUSHED OUT 
OF DOWNTOWN CHARLESTON...HOWEVER LIGHT TO OCCASIONALLY MODERATE 
RAINS WILL CONTINUE THROUGH THE MORNING. SIGNIFICANT FLOODING IS 
ONGOING THROUGHOUT MUCH OF DOWNTOWN WITH MANY STREETS IMPASSABLE OR 
CLOSED. FLOOD WATERS ARE ALSO LIKELY THREATENING HOMES. WITH HIGH 
TIDE QUICKLY APPROACHING...LONG TERM FLOODING WILL CONTINUE EVEN 
WITH ONLY LIGHT RAIN FALLING. ADDITIONAL THUNDERSTORMS WITH HEAVY 
RAIN ARE DEVELOPING OFF THE SOUTH CAROLINA AND GEORGIA COASTS. THESE 
STORMS MAY AFFECT CHARLESTON COUNTY LATER THIS AFTERNOON.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO DRIVE WHERE
WATER COVERS THE ROADWAY.

THIS IS A VERY DANGEROUS SITUATION. STAY TUNED TO NOAA WEATHER 
RADIO...TV OR YOUR LOCAL MEDIA OUTLET FOR THE LATEST INFORMATION 
FROM THE NATIONAL WEATHER SERVICE.

$$

ST
000 
WGUS72 KCHS 301619
FFSCHS
SCC019-301715-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
1219 PM EDT FRI AUG 30 2002

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR CHARLESTON COUNTY
UNTIL 1 PM EDT...
...DANGEROUS AND SIGNIFICANT FLOODING PERSISTS IN DOWNTOWN 
CHARLESTON...

AT 1219 PM EDT...RADAR INDICATED ONLY LIGHT TO OCCASIONALLY MODERATE 
RAIN FALLING ACROSS MUCH OF CHARLESTON COUNTY. RAINFALL AMOUNTS OF 2 
TO 4 INCHES FELL ACROSS MUCH OF THE AREA EARLIER TODAY AND WITH HIGH 
TIDE APPROACHING...NO STORM DRAINAGE HAS OCCURRED. BECAUSE OF 
THIS...SIGNIFICANT FLOODING CONTINUES ACROSS MUCH OF DOWNTOWN 
CHARLESTON. NUMEROUS ROADWAYS CONTINUE TO EITHER BE CLOSED OR HAVE 
SIGNIFICANT STANDING WATER ON THEM. HOMES ARE ALSO BEING THREATENED 
BY FLOOD WATERS.

ANOTHER LARGE AREA OF RAIN AND THUNDERSTORMS CONTINUES OFF THE SOUTH 
CAROLINA AND GEORGIA COASTS. THESE STORMS ARE MOVING NORTH BETWEEN 
15 AND 20 MPH AND COULD AFFECT CHARLESTON COUNTY LATER THIS 
AFTERNOON. SHOULD ADDITIONAL HEAVY RAINS DEVELOP...THE FLASH FLOOD 
WARNING MAY BE EXTENDED BEYOND 1 PM EDT. 

THIS IS A VERY DANGEROUS SITUATION. STAY TUNED TO NOAA WEATHER 
RADIO...TV OR YOUR LOCAL MEDIA OUTLET FOR THE LATEST STATEMENTS AND 
POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE IN CHARLESTON.

$$

ST
000 
WGUS72 KCHS 301703
FFSCHS
SCC019-301730-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
103 PM EDT FRI AUG 30 2002

...FLASH FLOOD WARNING FOR CHARLESTON COUNTY HAS EXPIRED...

ALTHOUGH LIGHT RAIN WILL CONTINUE THROUGH MOST OF THE AFTERNOON... 
HEAVY RAIN IS NOT IMMINENT. THEREFORE THE FLASH FLOOD WARNING HAS 
BEEN ALLOWED TO EXPIRE. HIGH TIDE WILL OCCUR AROUND 140 PM AND UNTIL 
THEN...AREAS OF STANDING WATER WILL CONTINUE ACROSS THE COUNTY... 
INCLUDING DOWNTOWN CHARLESTON...FOR THE NEXT FEW HOURS. SHOULD HEAVY 
RAIN REDEVELOP ACROSS THE AREA THIS AFTERNOON OR EVENING...ANOTHER 
FLASH FLOOD WARNING MAY BE NEEDED.

A FLOOD WATCH REMAINS IN EFFECT FOR ALL OF SOUTHEAST SOUTH CAROLINA 
THIS AFTERNOON AND WILL LIKELY BE EXTENDED INTO TONIGHT. PEOPLE 
ACROSS THE AREA SHOULD REMAIN ALERT AND BE PREPARED TO TAKE ACTION 
SHOULD FLOODING BE OBSERVED OR IF A FLASH FLOOD WARNING IS ISSUED.

STAY TUNED TO NOAA WEATHER RADIO...TV OR YOUR LOCAL MEDIA OUTLET FOR 
LATER STATEMENTS AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER 
SERVICE IN CHARLESTON.

$$

ST

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 30, 8:05 AM EDTSpecial Marine WarningCHS55 min
Aug 30, 8:16 AM EDTTornado WarningCHSBeaufort29 min

Nearby

Flash Flood Warnings in South Carolina, 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; radar from the NEXRAD Level II archive.