Inland thunderstorms that developed in the vicinity of a warm front inland moved to the coast and out over the adjacent coastal waters in the early morning hours. Then later in the day, additional thunderstorms impacted the coast and the coastal waters during the afternoon. Some of these thunderstorms became strong enough to produce strong wind gusts and large hail.

Marine Thunderstorm Wind in SAVANNAH GA TO ALTAMAHA SD GA OUT 20NM, ATLANTIC SOUTH
From 20-MAR-18 14:00:00 to 20-MAR-18 14:15:00 (EST-5)
Location: SAPELO ISLAND
Magnitude: 39.00 MG
Crop damage: 0.00K
Reported by: Official NWS Observations

The Sapelo Island NERRS site measured a 39 knot wind gust. The peak gust for the event was 48 knots which occurred at 2:15 pm EST.

Marine Thunderstorm Wind in SAVANNAH GA TO ALTAMAHA SD GA OUT 20NM, ATLANTIC SOUTH
From 20-MAR-18 14:45:00 to 20-MAR-18 14:47:00 (EST-5)
Location: SAPELO ISLAND
Magnitude: 41.00 MG
Crop damage: 0.00K
Reported by: Official NWS Observations

The Sapelo Island NERRS site measured a 41 knot wind gust.

Marine Thunderstorm Wind in SOUTH SANTEE RIVER TO EDISTO BEACH SC FROM 20 TO 40 NM, ATLANTIC SOUTH
From 20-MAR-18 15:20:00 to 20-MAR-18 15:30:00 (EST-5)
Location: EDISTO BUOY (41004)
Magnitude: 35.00 MG
Crop damage: 0.00K
Reported by: Buoy

Buoy 41004 measured a 35 knot wind gust. The peak wind gust of 39 knots occurred 10 minutes later.

Marine Hail in CHARLESTON HARBOR, ATLANTIC SOUTH
From 20-MAR-18 15:02:00 to 20-MAR-18 15:05:00 (EST-5)
Location: THE CHARLESTON BATTERY
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Public

Penny sized hail was reported on King Street between George and Calhoun Streets.

Marine Thunderstorm Wind in S SANTEE R TO EDISTO BEACH SC OUT 20NM, ATLANTIC SOUTH
From 20-MAR-18 04:34:00 to 20-MAR-18 04:39:00 (EST-5)
Location: FOLLY BEACH
Magnitude: 34.00 MG
Crop damage: 0.00K
Reported by: Mesonet

The Weatherflow site at the Folly Beach pier measured a 34 knot wind gust.

Marine Hail in EDISTO BEACH SC TO SAVANNAH GA OUT 20NM, ATLANTIC SOUTH
From 20-MAR-18 13:45:00 to 20-MAR-18 13:48:00 (EST-5)
Location: HILTON HEAD SOUND
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Broadcast Media

Quarter sized hail was reported near Central Church on Highway 278.

Marine Thunderstorm Wind in SOUTH SANTEE RIVER TO EDISTO BEACH SC FROM 20 TO 40 NM, ATLANTIC SOUTH
From 20-MAR-18 06:20:00 to 20-MAR-18 06:23:00 (EST-5)
Location: EDISTO BUOY (41004)
Magnitude: 39.00 MG
Crop damage: 0.00K
Reported by: Buoy

Buoy 41004 measured a 39 knot wind gust.

Marine Hail in EDISTO BEACH SC TO SAVANNAH GA OUT 20NM, ATLANTIC SOUTH
From 20-MAR-18 14:00:00 to 20-MAR-18 14:03:00 (EST-5)
Location: TYBEE ISLAND
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Social Media

A photo of 2 inch diameter hail on Daufuskie Island was received via Twitter.

Marine Hail in EDISTO BEACH SC TO SAVANNAH GA OUT 20NM, ATLANTIC SOUTH
From 20-MAR-18 14:21:00 to 20-MAR-18 14:24:00 (EST-5)
Location: HUNTING ISLAND
Magnitude: 0.75 
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported penny sized hail at Racoon Ridge Road on Saint Helena Island. The hail lasted about 5 minutes.

Marine Thunderstorm Wind in SOUTH SANTEE RIVER TO EDISTO BEACH SC FROM 20 TO 40 NM, ATLANTIC SOUTH
From 20-MAR-18 16:10:00 to 20-MAR-18 16:12:00 (EST-5)
Location: EDISTO BUOY (41004)
Magnitude: 43.00 MG
Crop damage: 0.00K
Reported by: Buoy

Buoy 41004 measured a 43 knot wind gust.