Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 13, NWS Charleston, SC
NWS Charleston, SC issued this severe thunderstorm warning at Mar 31, 2021, 8:31 PM EDT for Beaufort County, Charleston County, Colleton County, South Carolina. It was in force for 59 min. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Mar 31, 2021, 8:31 PM EDT (00:31 UTC)
- Expired
- Mar 31, 2021, 9:30 PM EDT
- In force
- 59 min
- Issued by
- NWS Charleston, SC
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Beaufort County, SC, Charleston County, SC, Colleton County, SC
The radar
The Charleston,SC radar (KCLX), 66 km from the middle of the area, began a volume at 00:32 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Mar 31, 8:54 PM EDT | TSTM WND GST 55 | 5 Sw Adams Run, SC | ACE BASIN RAWS REPORTED A 20 FOOT PEAK WIND GUST OF 55 MPH. |
| Mar 31, 8:59 PM EDT | MARINE TSTM WIND 47 | 2 Wsw Folly Beach, SC | THE WEATHERFLOW SENSOR ON THE SOUTH END OF FOLLY BEACH REPORTED A WIND GUST OF 41 KNOTS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 00:00Z, 0.5 hours before the alert went out and 56 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.
- Mixed-layer CAPE
- 871 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 870 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 132 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.6
The text
As transmitted.
196
WUUS52 KCHS 010031
SVRCHS
SCC013-019-029-010130-
/O.NEW.KCHS.SV.W.0013.210401T0031Z-210401T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Charleston SC
831 PM EDT Wed Mar 31 2021
The National Weather Service in Charleston has issued a
* Severe Thunderstorm Warning for portions of...
Beaufort County in southeastern South Carolina...
Charleston County in southeastern South Carolina...
Colleton County in southeastern South Carolina...
* Until 930 PM EDT.
* At 831 PM EDT, a severe thunderstorm was located over Edisto
Island, moving east at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Minor hail damage to vehicles is possible. Expect wind
damage to trees and powerlines.
* Locations impacted include...
Mount Pleasant, Hilton Head Island, Beaufort, Port Royal, Edisto
Beach, Fort Sumter, Johns Island, Downtown Charleston, Clarendon,
Isle Of Palms, Folly Beach, Sullivan's Island, Seabrook Island,
Kiawah Island and Meggett.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Report damage directly to the Charleston National Weather Service at
888-383-2024 when it is safe to do so.
&&
LAT...LON 3273 7985 3267 7986 3259 7997 3252 8015
3253 8021 3245 8032 3241 8034 3244 8041
3238 8040 3229 8042 3225 8058 3216 8068
3238 8086 3241 8083 3241 8085 3247 8082
3253 8085 3256 8084 3280 7982 3276 7978
TIME...MOT...LOC 0031Z 250DEG 36KT 3254 8033
HAIL...1.00IN
WIND...60MPH
$$3 follow-up statements
216
WWUS52 KCHS 010053
SVSCHS
Severe Weather Statement
National Weather Service Charleston SC
853 PM EDT Wed Mar 31 2021
SCC013-019-029-010130-
/O.CON.KCHS.SV.W.0013.000000T0000Z-210401T0130Z/
Beaufort SC-Charleston SC-Colleton SC-
853 PM EDT Wed Mar 31 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR BEAUFORT...CHARLESTON AND COLLETON COUNTIES...
At 853 PM EDT, a severe thunderstorm was located over Kiawah Island,
moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and powerlines.
Locations impacted include...
Mount Pleasant, Hilton Head Island, Beaufort, Port Royal, Edisto
Beach, Fort Sumter, Johns Island, Downtown Charleston, Clarendon,
Isle Of Palms, Folly Beach, Sullivan's Island, Seabrook Island,
Kiawah Island and Meggett.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
Report damage directly to the Charleston National Weather Service at
888-383-2024 when it is safe to do so.
&&
LAT...LON 3273 7985 3267 7986 3260 7996 3252 8015
3253 8021 3245 8032 3241 8034 3244 8041
3238 8040 3229 8042 3225 8058 3216 8068
3238 8086 3241 8083 3241 8085 3247 8082
3253 8085 3256 8083 3280 7982 3276 7978
TIME...MOT...LOC 0053Z 250DEG 36KT 3262 8008
HAIL...<.75IN
WIND...60MPH
$$263
WWUS52 KCHS 010108
SVSCHS
Severe Weather Statement
National Weather Service Charleston SC
908 PM EDT Wed Mar 31 2021
SCC013-010118-
/O.CAN.KCHS.SV.W.0013.000000T0000Z-210401T0130Z/
Beaufort SC-
908 PM EDT Wed Mar 31 2021
...THE SEVERE THUNDERSTORM WARNING FOR BEAUFORT COUNTY IS
CANCELLED...
The immediate risk for severe weather has ended.
LAT...LON 3273 7985 3267 7986 3260 7996 3252 8015
3253 8021 3245 8032 3241 8035 3256 8043
3264 8050 3280 7982 3276 7978
TIME...MOT...LOC 0108Z 249DEG 40KT 3276 7967
$$
SCC019-029-010130-
/O.CON.KCHS.SV.W.0013.000000T0000Z-210401T0130Z/
Charleston SC-Colleton SC-
908 PM EDT Wed Mar 31 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM EDT
FOR CHARLESTON AND COLLETON COUNTIES...
At 908 PM EDT, a severe thunderstorm was located near Isle Of Palms,
moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and powerlines.
Locations impacted include...
Mount Pleasant, Edisto Beach, Johns Island, Fort Sumter, Downtown
Charleston, Isle Of Palms, Folly Beach, Sullivan's Island, Seabrook
Island, Kiawah Island, Meggett, Rockville, Bears Bluff, Sullivans
Island and Wadmalaw Island.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
Report damage directly to the Charleston National Weather Service at
888-383-2024 when it is safe to do so.
&&
LAT...LON 3273 7985 3267 7986 3260 7996 3252 8015
3253 8021 3245 8032 3241 8035 3256 8043
3264 8050 3280 7982 3276 7978
TIME...MOT...LOC 0108Z 249DEG 40KT 3276 7967
HAIL...<.75IN
WIND...60MPH
$$232
WWUS52 KCHS 010124
SVSCHS
Severe Weather Statement
National Weather Service Charleston SC
924 PM EDT Wed Mar 31 2021
SCC019-029-010133-
/O.EXP.KCHS.SV.W.0013.000000T0000Z-210401T0130Z/
Charleston SC-Colleton SC-
924 PM EDT Wed Mar 31 2021
...THE SEVERE THUNDERSTORM WARNING FOR CHARLESTON AND COLLETON
COUNTIES WILL EXPIRE AT 930 PM EDT...
The storm which prompted the warning has moved out of the area.
Therefore the warning will be allowed to expire. However, brief
heavy rain and lightning are still possible with additional
thunderstorms.
LAT...LON 3273 7985 3267 7986 3260 7996 3252 8015
3253 8021 3245 8032 3241 8035 3256 8043
3264 8050 3280 7982 3276 7978
TIME...MOT...LOC 0123Z 250DEG 36KT 3289 7923
$$
SPRThe office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 31, 8:23 PM EDT | Areal Flood Advisory | CHS | Charleston | 112 min |
| Mar 31, 8:23 PM EDT | Special Marine Warning | CHS | 112 min | |
| Mar 31, 8:45 PM EDT | Special Marine Warning | CHS | 90 min | |
| Mar 31, 8:48 PM EDT | Special Weather Statement | CHS | Charleston | 27 min |
| Mar 31, 9:13 PM EDT | Special Weather Statement | CHS | Charleston | 32 min |
| Mar 31, 9:23 PM EDT | Special Marine Warning | CHS | 97 min | |
| Mar 31, 10:13 PM EDT | Special Marine Warning | CHS | 40 min | |
| Apr 1, 7:35 AM EDT | Lake Wind Advisory | CHS | Berkeley | 6 hr |
| Apr 1, 11:15 AM EDT | River Flood Warning | CHS | Hampton, Jasper | 21 days |
| Apr 1, 3:08 PM EDT | Freeze Warning | CHS | Allendale, Berkeley, Colleton, Dorchester, Hampton | 17 hr |
Nearby
Severe Thunderstorm Warnings in South Carolina, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.