A large cluster of supercell thunderstorms impacted much of eastern Tennessee, southwest Virginia
as well as the Carolinas
on Saturday, April 9, 2011. Numerous reports of large hail were relayed to the National Weather
Service by the public, Skywarn spotters, and law enforcement agencies throughout the day. One
especially intense thunderstorm moved across portions of northern Berkeley County, SC during the
late evening hours dropping quarter to tennis ball size hail in communities such as Pineville, Saint
Stephen and Bonneau. At 1120 pm EDT, a Skywarn spotter reported tennis ball size hail near the
community of Russellville about 3 miles west-southwest of Saint Stephen. A peak wind gust of 64 mph
was also observed by National Weather Service wind equipment on the Santee Dam along the eastern
shore of Lake Marion.
Click any image for a larger version.
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
1105 PM TSTM WND GST 14 WNW SAINT STEPHEN 33.48N 80.15W
04/09/2011 M64 MPH BERKELEY SC OFFICIAL NWS OBS
1112 PM HAIL 5 WNW SAINT STEPHEN 33.43N 80.01W
04/09/2011 E1.75 INCH BERKELEY SC LAW ENFORCEMENT
QUARTER TO GOLFBALL SIZE HAIL REPORTED IN PINEVILLE.
1120 PM HAIL 3 WSW SAINT STEPHEN 33.39N 79.97W
04/09/2011 M2.50 INCH BERKELEY SC TRAINED SPOTTER
GOLFBALL TO TENNIS BALL SIZE HAIL REPORTED NEAR
1123 PM HAIL SAINT STEPHEN 33.40N 79.92W
04/09/2011 E0.88 INCH BERKELEY SC TRAINED SPOTTER
1125 PM TSTM WND DMG SAINT STEPHEN 33.40N 79.92W
04/09/2011 BERKELEY SC FIRE DEPT/RESCUE
TREES DOWN BETWEEN BONNEAU AND SAINT STEPHEN.
1125 PM HAIL SAINT STEPHEN 33.40N 79.92W
04/09/2011 M1.75 INCH BERKELEY SC FIRE DEPT/RESCUE
FIRE DEPARTMENT PERSONNEL REPORTS GOLF BALL SIZE HAIL
BETWEEN SAINT STEPHEN AND BONNEAU.
1125 PM HAIL BONNEAU 33.31N 79.96W
04/09/2011 M1.25 INCH BERKELEY SC PUBLIC
QUARTER TO HALF DOLLAR SIZE HAIL REPORTED NEAR BONNEAU.
1128 PM HAIL 4 ESE BONNEAU 33.27N 79.90W
04/09/2011 M1.75 INCH BERKELEY SC PUBLIC
GOLFBALL SIZE HAIL FELL FOR 10 TO 15 MINUTES IN THE
1128 PM HAIL 4 E BONNEAU 33.30N 79.90W
04/09/2011 M1.75 INCH BERKELEY SC TRAINED SPOTTER
GOLFBALL SIZE HAIL REPORTED BY SKYWARN SPOTTER. EAST OF
1130 PM HAIL 6 ESE BONNEAU 33.27N 79.87W
04/09/2011 E1.25 INCH BERKELEY SC TRAINED SPOTTER
QUARTER TO HALF DOLLAR SIZE HAIL REPORTED BY A SKYWARN
SPOTTER. THE HAIL COMPLETELY COVERED THE GROUND.
KCLX Radar Imagery
Reflectivity at 1112 pm EDT
4-panel at 1112 pm EDT
Note: Storm Top near 60,000 ft
Vertically Integrated Liquid (VIL) at 1112 pm EDT
Peak VIL: 76 g/kg
Reflectivity at 1120 pm EDT
Spotter reports tennis ball size hail near Russellville
NSSL Experimental Hail Swath Product
Cumulative Warning Polygons During Event