Alert archive / South Carolina / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 21, NWS Charleston, SC
NWS Charleston, SC issued this severe thunderstorm warning at Apr 13, 2020, 8:42 AM EDT for Berkeley County, Charleston County, South Carolina. It was in force for 33 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
- Apr 13, 2020, 8:42 AM EDT (12:42 UTC)
- Expired
- Apr 13, 2020, 9:15 AM EDT
- In force
- 33 min
- Issued by
- NWS Charleston, SC
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Berkeley County, SC, Charleston County, SC
The radar
The Charleston,SC radar (KCLX), 142 km from the middle of the area, began a volume at 12:43 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 |
|---|---|---|---|
| Apr 13, 8:51 AM EDT | TSTM WND DMG | 5 Se Cainhoy, SC | TREE SNAPPED AND FELL ON CAR IN CLASSIC COURT. |
| Apr 13, 9:04 AM EDT | MARINE TSTM WIND 48 | 1 E Sullivans Island, SC | SULLIVANS ISLAND WXFLOW GUSTED TO 42 KT. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 13, 3:20 AM EDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Charleston AFB, SC (KCHS), launched 12:00Z, 0.7 hours before the alert went out and 41 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
- 943 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 698 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- 475 m²/s²
- 0-3 km storm-relative helicity
- 509 m²/s²
- Significant tornado parameter
- 3.2
- Supercell composite
- 14.1
The text
As transmitted.
013
WUUS52 KCHS 131242
SVRCHS
SCC015-019-131315-
/O.NEW.KCHS.SV.W.0021.200413T1242Z-200413T1315Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Charleston SC
842 AM EDT Mon Apr 13 2020
The National Weather Service in Charleston has issued a
* Severe Thunderstorm Warning for portions of...
Charleston County in southeastern South Carolina...
Berkeley County in southeastern South Carolina...
* Until 915 AM EDT.
* At 842 AM EDT, severe thunderstorms were located along a line
extending from near Naval Weapons Station Charleston to 6 miles
south of Folly Beach, moving east at 50 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Law enforcement.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
North Charleston, Mount Pleasant, Goose Creek, Hanahan,
McClellanville, Downtown Charleston, Daniel Island, Fort Sumter,
James Island, West Ashley, Johns Island, Isle Of Palms, Folly
Beach, Sullivan's Island and Kiawah Island.
This warning includes...
I-26 between mile markers 216 and 221.
I-526 between mile markers 21 and 31.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.
This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage across the area. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows! Report damage directly to the
Charleston National Weather Service at 1-888-383-2024 when it is
safe to do so.
&&
LAT...LON 3307 7931 3299 7933 3298 7951 3288 7955
3274 7983 3267 7986 3259 7997 3257 8004
3294 7998 3324 7951 3324 7946 3316 7937
3314 7927 3310 7927
TIME...MOT...LOC 1242Z 260DEG 43KT 3296 7990 3256 7993
HAIL...0.75IN
WIND...70MPH
$$2 follow-up statements
080
WWUS52 KCHS 131301
SVSCHS
Severe Weather Statement
National Weather Service Charleston SC
901 AM EDT Mon Apr 13 2020
SCC015-019-131315-
/O.CON.KCHS.SV.W.0021.000000T0000Z-200413T1315Z/
Charleston SC-Berkeley SC-
901 AM EDT Mon Apr 13 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 AM EDT
FOR CHARLESTON AND BERKELEY COUNTIES...
At 901 AM EDT, severe thunderstorms were located along a line
extending from near Awendaw to 14 miles southeast of Isle Of Palms,
moving east at 50 mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Law enforcement.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Mount Pleasant, McClellanville, Isle Of Palms, Awendaw, Garris
Landing, Hampton Plantation State Park, Price Inlet, Bull Island,
Capers Inlet, Santee Coastal Reserve, Cape Island, Lighthouse Island
and Cape Romain.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a place
of safety inside a sturdy structure, such as a basement or small
interior room.
This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage across this area. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.
Report damage directly to the Charleston National Weather Service at
1-888-383-2024 when it is safe to do so.
&&
LAT...LON 3307 7931 3299 7933 3298 7951 3288 7955
3277 7977 3281 7979 3287 7979 3297 7975
3306 7977 3324 7951 3324 7946 3322 7945
3316 7937 3314 7927 3310 7927
TIME...MOT...LOC 1301Z 260DEG 43KT 3300 7965 3260 7968
HAIL...0.75IN
WIND...70MPH
$$324
WWUS52 KCHS 131310
SVSCHS
Severe Weather Statement
National Weather Service Charleston SC
910 AM EDT Mon Apr 13 2020
SCC015-019-131320-
/O.EXP.KCHS.SV.W.0021.000000T0000Z-200413T1315Z/
Charleston SC-Berkeley SC-
910 AM EDT Mon Apr 13 2020
...THE SEVERE THUNDERSTORM WARNING FOR CHARLESTON AND BERKELEY
COUNTIES WILL EXPIRE AT 915 AM EDT...
The storms which prompted the warning have moved out of the area.
Therefore the warning will be allowed to expire.
LAT...LON 3307 7931 3299 7933 3298 7951 3288 7955
3277 7977 3281 7979 3287 7979 3297 7975
3306 7977 3324 7951 3324 7946 3322 7945
3316 7937 3314 7927 3310 7927
TIME...MOT...LOC 1310Z 260DEG 43KT 3302 7953 3262 7956
$$The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 10:23 PM EDT | Coastal Flood Advisory | CHS | 4 hr | |
| Apr 13, 5:33 AM EDT | Severe Thunderstorm Warning | CHS | Allendale, Hampton, Jasper | 57 min |
| Apr 13, 5:54 AM EDT | Tornado Warning | CHS | Allendale, Hampton | 36 min |
| Apr 13, 6:02 AM EDT | Tornado Warning | CHS | Allendale | 14 min |
| Apr 13, 6:18 AM EDT | Tornado Warning | CHS | Colleton, Hampton | 27 min |
| Apr 13, 6:22 AM EDT | Severe Thunderstorm Warning | CHS | Beaufort, Colleton, Dorchester, Hampton, Jasper | 53 min |
| Apr 13, 6:38 AM EDT | Tornado Warning | CHS | Colleton, Hampton | 37 min |
| Apr 13, 6:53 AM EDT | Severe Thunderstorm Warning | CHS | Beaufort, Berkeley, Charleston, Colleton, Dorchester | 52 min |
| Apr 13, 7:01 AM EDT | Tornado Warning | CHS | Colleton, Dorchester | 29 min |
| Apr 13, 7:08 AM EDT | Severe Thunderstorm Warning | CHS | Beaufort, Jasper | 67 min |
| Apr 13, 7:15 AM EDT | Severe Thunderstorm Warning | CHS | Jasper | 60 min |
| Apr 13, 7:26 AM EDT | Tornado Warning | CHS | Berkeley, Dorchester | 34 min |
| Apr 13, 7:42 AM EDT | Severe Thunderstorm Warning | CHS | Beaufort, Berkeley, Charleston, Colleton, Dorchester | 63 min |
| Apr 13, 7:47 AM EDT | Special Marine Warning | CHS | 88 min | |
| Apr 13, 7:50 AM EDT | Special Marine Warning | CHS | 115 min | |
| Apr 13, 7:54 AM EDT | Tornado Warning | CHS | Berkeley | 18 min |
| Apr 13, 8:00 AM EDT | Tornado Warning | CHS | Charleston, Colleton | 30 min |
| Apr 13, 8:13 AM EDT | Severe Thunderstorm Warning | CHS | Beaufort, Jasper | 62 min |
| Apr 13, 8:26 AM EDT | Tornado Warning | CHS | Charleston | 34 min |
| Apr 13, 9:06 AM EDT | Special Marine Warning | CHS | 54 min | |
| Apr 13, 9:38 AM EDT | Special Marine Warning | CHS | 86 min | |
| Apr 13, 9:41 AM EDT | Special Marine Warning | CHS | 82 min | |
| Apr 13, 9:53 AM EDT | Small Craft Advisory | CHS | 17 hr |
Nearby
Severe Thunderstorm Warnings in South Carolina, 2020Every severe thunderstorm warning in 2020
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.