Alert archive / South Carolina / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 5, NWS Charleston, SC

May 5, 1990Berkeley County, Dorchester County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at May 5, 1990, 6:03 PM EDT for Berkeley County, Dorchester County, South Carolina. It was in force for 57 min. 3 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
May 5, 1990, 6:03 PM EDT (22:03 UTC)
Expired
May 5, 1990, 7:00 PM EDT
In force
57 min
Issued by
NWS Charleston, SC
Area
Whole counties

Counties Berkeley County, SC, Dorchester County, SC

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

TimeReportWhereRemark
May 5, 6:08 PM EDTHail 1.25Dorchester, SC
May 5, 6:15 PM EDTHail 1Berkeley, SC
May 5, 6:15 PM EDTHail 1Berkeley, SC

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 10.1 hours before the alert went out and 31 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 1990-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 315 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, Charleston AFB, SC at 12:00Z on 1990-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 137 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
315 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
879 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
137 m²/s²
0-3 km storm-relative helicity
191 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCHS 052204
SVRCHS
SCC015-035-052300-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
603 PM EDT SAT MAY 5 1990
 
THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  700 PM EDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN  SOUTH CAROLINA
          ...BERKELEY...DORCHESTER
 
A SEVERE THUNDERSTORM PRODUCING LARGE HAIL WAS DETECTED BY CHARLESTON
WEATHER RADAR NEAR SUMMERVILLE SOUTH CAROLINA MOVING EASTWARD AT 30
MILES AN HOUR.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM 9ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, May 5, 2:01 PM EDT, 4 hours 2 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHARLESTON SC
150 PM EDT SAT MAY 5 1990

...HEAVY THUNDERSTORMS MOVING INTO THE NORTH COASTAL COUNTIES...

AT 150 PM...HEAVY THUNDERSTORMS WERE MOVING INTO THE NORTH COASTAL
COUNTIES OF SOUTH CAROLINA..THIS LINE WAS FROM ABOUT 35 MILES NORTH
OF CHARLESTON TO 25 MILES WEST OF MYRTLE BEACH.

PERSONS IN THE NORTHERN COASTAL COUNTIES CAN EXPECT HEAVY DOWNPOURS
...STRONG GUSTY WINDS...DANGEROUS LIGHTNxING AND POSSIBLE SMALL
HAIL TO ACCOMPANY THESE STORMS. SOME FLOODING OF LOW LYING AREAS
MAY OCCUR AS THE STORMS MOVE NORTHEAST ALONG THE COAST THIS
AFTERNOON.

FGM
Special weather statement, May 5, 2:32 PM EDT, 3 hours 31 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE CHARLESTON SC
230 PM EDT SAT MAY 5 1990

...HEAVY THUNDERSTORMS OVER THE NORTH COASTAL COUNTIES...

AT 230 PM...HEAVY THUNDERSTORMS WERE OVER THE NORTH COASTAL COUNTIES
OF SOUTH CAROLINA..THIS LINE WAS FROM ABOUT 35 MILES NORTHEAST OF
CHARLESTON TO MYRTLE BEACH.

PERSONS IN THE NORTHERN COASTAL COUNTIES CAN EXPECT HEAVY DOWNPOURS
...STRONG GUSTY WINDS...DANGEROUS LIGHTNING AND POSSIBLE SMALL
HAIL TO ACCOMPANY THESE STORMS. SOME FLOODING OF LOW LYING AREAS
MAY OCCUR AS THE STORMS MOVE NORTHEAST AT 25 MILES HOUR THIS AFTERNOON.

FGM
Special weather statement, May 5, 4:44 PM EDT, 1 hour 19 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE CHARLESTON SC
435 PM EDT SAT MAY 5 1990

...SEVERE THUNDERSTORM WATCH FOR COASTAL COUNTIES UNTIL 10PM EDT....

AT 430 PM...HEAVY THUNDERSTORMS WERE NOTED FROM 25 MILES SOUTHEAST OF
AUGUSTA TO NORTHERN DORCHESTER COUNTY...ABOUT 15 MILES SOUTHEAST OF
ORANGEBURG.

THESE THUNDERSTORMS MAY BE ACCOMPANIED BY DAMAGING WIND GUSTS...BRIEF
VERY HEAVY DOWNPOURS AND POSSIBLY SOME HAIL AS THEY MOVE RAPIDLY EAST-
WARD THROUGH THE COASTAL COUNTIES DURING THE NEXT FEW HOURS.

DURING THE NEXT HOUR...PERSONS ON LAKES MARION AND MOULTRIE SHOULD BE
ON THE LOOKOUT FOR SEVERE WEATHER AND BE READY TO SEEK SAFE SHELTER AS
THESE STORMS APPROACH.  STAY TUNED TO NOAA WEATHER RADIO FOR LATER
STATEMENTS AND POSSIBLE WARNINGS.
JFT
Special weather statement, May 5, 5:33 PM EDT, 30 minutes before
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE CHARLESTON SC
535 PM EDT SAT MAY 5 1990

...SEVERE THUNDERSTORM WATCH FOR COASTAL COUNTIES UNTIL 10PM EDT....

AT 530 PM...VERY HEAVY THUNDERSTORMS WERE NOTED IN NORTHERN COLLETON
NORTHERN DORCHESTER AND CENTRAL BERKELEY COUNTIES IN SOUTH CAROLINA.
A REPORT OF SOME TREE DAMAGE WAS RECEIVED FROM THE RIVERS BRIDGE STATE
PARK AREA OF SOUTHERN BAMBERG COUNTY AS THESE STORMS MOVED THROUGH.

DURING THE NEXT HOUR...PERSONS IN NORTHERN COLLETON COUNTY...CENTRAL
AND NORTHERN DORCHESTER AND BERKELEY COUNTIES SHOULD BE ON THE LOOKOUT
FOR THESE STORMS AND BE PREPARED TO TAKE COVER IF THREATENING CON-
DITIONS APPROACH.  DAMAGING WINDS !AND HAIL ARE POSSIBLE AS THESE
THUNDERSTORMS MOVE THROUGH.   STAY TUNED TO NOAA WEATHER RADIO FOR
LATER STATEMENTS AND POSSIBLE WARNINGS.

JFT
Special weather statement, May 5, 5:47 PM EDT, 16 minutes before
GAZ009-013>015-092300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAVANNAH GA
545 PM EDT SAT MAY 5 1990

...A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 PM TONIGHT FOR
   EAST CENTRAL AND SOUTHEAST GEORGIA AS WELL AS CENTRAL AND EASTERN
   SOUTH CAROLINA AND THE ADJACENT COASTAL WATERS...

IN SOUTHEAST GEORGIA...NEARLY ALL THE COUNTIES ARE INCLUDED IN THE
WATCH AREA. THIS INCLUDES THE CITIES OF BRUNSWICK...SAVANNAH...JESUP
...ALMA AND BAXLEY GEORGIA.

AT 540 PM WEATHER RADAR DETECTED A LINE OF SHOWERS AND A FEW THUNDER-
STORMS EXTENDING FROM WALTERBORO SOUTH CAROLINA THROUGH SAVANNAH THEN
WEST TO STATESBORO AND HAZLHURST GEORGIA. THE STORNGEST STORM WAS
LOCATED ABOUT 15 MILES NORTH NORTHEAST OF STATESBORO AND MOVING TO
THE NORTHEAST AT 40 MILES AN HOUR.

THE COMBINATION OF VERY MOIST UNSTABLE AIR AND A COLD FRONT ATTEMPTING
TO PUSH EAST INTO SOUTHEAST GEORGIA IS THE REASON FOR THE
SEVERE THUNDERSTORM WATCH. HERE A FEW PREPAREDNESS SUGGESTIONS
FOR THOSE WHO ARE IN OR NEAR THE WATCH AREA:

1. IF YOU LIVE IN A MOBILE HOME MOVE TO A REINFORCED BUILDING.

2. IF YOU ARE OUTSIDE...PLAYING GOLF OR JUST CUTTING THE GRASS
   DO NOT MOVE UNDER TREES OR STEEL SHEDS...LIGHTING CAN AND DOES
   KILL.

3. IF YOUR IN A BOAT OFFSHORE OR ON THE INTRACOASTAL WATERWAY
   THINK ABOUT HEADING TO SAFE HARBOR NOW.

4. IF YOUR AT HOME OR IN A BULDING MOVE TO A BATHROOM LEADING
   OFF AN INTERIOR HALLWAY OR GET UNDER A STRONG TABLE IF YOU
   EXPERIENCE A SEVERE THUNDERSTORM.

Nearby

Severe Thunderstorm Warnings in South Carolina, 1990Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.