Alert archive / South Carolina / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 15, NWS Charleston, SC

August 1, 1990Georgetown County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Aug 1, 1990, 8:28 PM EDT for Georgetown County, South Carolina. It was in force for 62 min. 1 report 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
Aug 1, 1990, 8:28 PM EDT (00:28 UTC)
Expired
Aug 1, 1990, 9:30 PM EDT
In force
62 min
Issued by
NWS Charleston, SC
Area
Whole counties

County Georgetown 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
Aug 1, 9:06 PM EDTHail 1Georgetown, 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 00:00Z, 0.5 hours before the alert went out and 87 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 00:00Z on 1990-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 130 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 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 00:00Z on 1990-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 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
130 J/kg
Mixed-layer CIN
-147 J/kg
Mixed-layer LCL
1217 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
60 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 KCHS 020032
SVRCHS
SCC043-020130-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHARLESTON SC
828 PM EDT WED AUG 1 1990
 
THE NATIONAL WEATHER SERVICE IN CHARLESTON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  930 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN  SOUTH CAROLINA
 
   ...GEORGETOWN COUNTY
 
THIS INCLUDES THE COMMUNITIES OF GEORGETOWN AND ANDREWS.
 
 
AT 8.30 PM EDT RADAR INDICATED A SEVERE THUNDERSTORM 5 MILES WEST OF
GEROGREOWN AND ANDREWS MOVING TOWARD THE EAST AT 15 MPH.
 
 
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING.  DO NOT STAND BY WINDOWS.  DON'T USE TELEPHONES
OR ELECTRICAL APPLWIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED.  MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.

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, Aug 1, 4:44 PM EDT, 3 hours 44 minutes before
SCZ007-008-012145-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE CHARLESTON SC
330 PM EDT WED JUL 25 1990

...THUNDERSTORMS WITH HEAVY RAIN OVER SOUTH COASTAL SOUTH CAROLINA...

AT 440 PM EDT...THUNDERSTORMS...SOME WITH VERY HEAVY DOWNPOURS WERE
DEVELOPING OVER THE LOWER COASTAL AREA OF SOUTH CAROLINA.  THE THUNDER-
STORMS AND HEAVY SHOWERS WILL CAUSE SOME FLOODING OF CITY STREETS AND
DROP VISIBILITY TO NEAR ZERO ON THE ROADWAYS.

THE HEAVIER STORMS WERE IN SOUTHEAST GEORGIA TO THE WEST OF SAVANNAH.

RMS
Special weather statement, Aug 1, 5:39 PM EDT, 2 hours 49 minutes before
SCZ007-008-012245-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE CHARLESTON SC
535 PM EDT WED JUL 25 1990

...THUNDERSTORMS WITH HEAVY RAIN OVER SOUTH COASTAL SOUTH CAROLINA...

AT 530 PM EDT...THUNDERSTORMS...SOME WITH VERY HEAVY DOWNPOURS WERE
SCATTERED OVER THE LOWER COASTAL COUNTIES OF SOUTH CAROLINA.  THE
HEAVIER THUNDERSTORMS AND SHOWERS WERE IN A NARROW BAND FROM NEAR MT
PLEASANT TO A FEW MILES NORTHWEST OF BEAUFORT.  THESE STORMS AND
SHOWERS WERE MOVING TOWARD THE EAST-SOUTHEAST AT AROUND 10 MILES AN
HOUR.  SOME STREET FLOODING...PONDING OF WATER ON HIWAYS AND POSSIBLY
SOME SMALL HAIL WILL ACCOMPANY THESE STORMS.

THUNDERSTORMS AND SHOWERS WERE IN SOUTHEAST GEORGIA FROM SAVANNAH TO
THE FLORIDA BORDER.  THE SHOWERS WERE EXTENDING INLAND ABOUT 60 MILES.

SIMPSON
Special weather statement, Aug 1, 6:03 PM EDT, 2 hours 25 minutes before
GAZ010-013-014-015-012300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SAVANNAH GA
602 PM EDT WED AUG 1 1990

...VERY STRONG THUNDERSTORMS CONTINUE OVER PARTS OF SOUTHEAST
GEORGIA...

AT 550 PM EDT WEATHER SERVICE RADARS CONTINUE TO SHOW SCATTERED VERY
STRONG THUNDERSTORMS EMBEDDED IN A LARGE AREA OF LIGHT RAIN EXTENDING
FROM NEAR ALMA EASTWARD TO SOUTH OF BRUNSWICK AND OVER THE COASTAL
WATERS. THE STRONGEST STORMS WERE LOCATED NORTHEAST OF JESUP...AND
FROM SOUTHERN CHATHAM COUNTY SOUTHWESTWARD TO JUST EAST OF HINESVILLE.
ANOTHER AREA OF VERY STRONG THUNDERSTORMS WERE LOCATED FROM 15 MILES
EAST OF BRUNSWICK SOUTHWESTWARD TO CENTRAL CAMDEN COUNTY. MOVEMENT
WAS TO THE EAST AT 10 MILES AN HOUR.

THE THUNDERSTORMS OVER SOUTHEAST GEORGIA THIS AFTERNOON HAVE BEEN
PRODUCING VERY FREQUENT AND DANGEROUS LIGHTNING. SEVERAL REPORTS
OF TREES STRUCK AND ON FIRE HAVE BEEN RECEIVED FROM JESUP AND
SAVANNAH. DANGEROUS LIGHTNING WILL CONTINUE WITH THESE THUNDESTORMS
FOR THE NEXT SEVERAL HOURS AND RESIDENTS ARE URGED TO STAY INSIDE
DURING THUNDERSTORMS.

VERY HEAVY RAINFALL HAS BEEN REPORTED WITH THESE THUNDERSTORMS
FROM SAVANNAH TO JESUP AND RAINFALL AMOUNTS HAVE BEEN REPORTED UP
TO TWO AND ONE HALF INCHES OVER SOUTHERN CHATHAM COUNTY. TEMPORARY
FLOODING OF ROADS AND LOW SPOTS MAY CONTINUE IN THE STRONGER STORMS.
GUSTY WINDS TO 40 MILES AN HOUR ARE ALSO STILL POSSIBLE.
Special weather statement, Aug 1, 6:41 PM EDT, 1 hour 47 minutes before
SCZ007-008-012345-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE CHARLESTON SC
635 PM EDT WED JUL 25 1990

...THUNDERSTORMS WITH HEAVY RAIN OVER CHARLESTON COUNTY...

AT 630 PM EDT...A CLUSTER OF INTENSE THUNDERSTORMS WAS MOVING THROUGH
THE TRI-COINTY AREA OF CHARLESTON-BERKELEY-DORCHESTER.  THESETHUNDER-
STORMS WILL HAVE STRONG GUSTY WINDS...HAIL AND VERY HEAVY RAIN AS THEY
MOVE EAST THROUGH THE TRI-COUNTY AREA.  AT THE CHARLESTON INTERNATIONAL
AIRPORT WINDS WERE GUSTING TO 35 MILES AN HOUR.

THESE STORMS WILL AFFECT NORTH CHARLESTON...CHARLESTON...SUMMERVILLE...
GOOSE CREEK AND HANNAHAN.  IF DRIVING BE PREPARED FOR FLOODED STREETS...
VISIBILITY NEAR ZERO AND SUDDEN STRONG WINDS.

OTHER THUNDERSTORMS WERE SCATTERED OVER THE LOWER COASTAL COUNTIES AND
IN SOUTHEAST GEORGIA.
SIMPSON
Local storm report, Aug 1, 6:42 PM EDT, 1 hour 46 minutes before
LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAVANNAH GA
640 PM EDT AUG 1 1990

...STRORM RELATED DAMAGE IN CHATHAM COUNTY 08/01/90

AT 230 PM EDT 8/01/90 A SEVERE THUNDESTORM MOVED ACROSS NORTHERN CHATHAM
COUNTY. AT THE SAVANNAH INTERNATIONAL AIRPORT...THE FBO BUILDING (BUTLER
AVIATION) RECEIVED SUBSTANTIAL DAMAGE. ABOUT 1/2 OF THE ROOF WAS RIPPED
OFF AND WATER DAMAGE INSIDE HELPED TO DAMAGE THE AIR CONDITIONING UNITS.
AT ABOUT THE SAME TIME...THE WEATHER SERVICE OFFICE AT THE AIRPORT CLOCKED
A WIND GUST OF 50 KNOTS. THE STORM MOVED EAST INTO PORT WENTWORTH AND AT
320 PM HIGH WINDS BLEW DOWN POWER LINES. BETWEEN 3 AND 4 PM LARGE LIMBS
WERE BLOWN DOWN AND HOUSE AWNINGS WERE DESTROYED NEAR VICTORY AND SKIDAWAY
DRIVES IN SAVANNAH AND LARGE TREES WERE BLOWN DOWN NEAR BULL STREET AND
52ND AVE DURING THE SAME TIME FRAME. AT ABOUT 430 PM LARGE TREES WERE
DOWNED IN GEORGTOWN ON THE SOUTH SIDE OF SAVANNAH. AT 6 PM...
SAVANNAH ELECTRIC AND POWER COMPANY REPORTED THAT MANY POWER LINES AND
TREES WERE DOWN OVER A GENERAL AREA BETWEEN VERNONBURG AND WILMINGTON
ISLAND.
Special weather statement, Aug 1, 7:38 PM EDT, 50 minutes before
SCZ007-008-020045-

SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE CHARLESTON SC
735 PM EDT WED JUL 25 1990

AT 730 PM EDT...THUNDERSTORMS WITH VERY HEAVY RAIN AND STRONG GUSTY
WINDS HAD MOVED EAST OF SUMMERVILLE AND THE CHARLESTON AREA.  WINDS
GUSTING TO 45 MILES AN HOUR WERE RECORDED AT THE CHARLESTON INTERNATIONAL
AIRPORT AS THESE STORMS MOVED EAST.

THUNDERSTORMS HAD DEVELOPED IN THE NORTH MIDLANDS AND NORTHERN COASTAL
AREAS OF SOUTH CAROLINA.  A FEW THUNDERSTORMS WERE ALONG THE SAVANNAH
RIVER SOUTH OF AUGUSTA.

A FEW HEAVY THUNDERSTORMS IN THE MT PLEASANT AREA WILL MOVE INTO THE
COASTAL WATERS AND BOATERS SHOULD BE ALERT FROM THE CHARLESTON HARBOR
TO NORTH ISLAND FOR THE NEXT TWO HOURS.

ALL PRECIPITATION WAS MOVING TO THE EAST AT 10 TO 15 MILES AN HOUR.
SIMPSON

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.