Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 11, NWS Charleston, SC

March 31, 2021Berkeley County, Charleston County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Mar 31, 2021, 7:53 PM EDT for Berkeley County, Charleston County, South Carolina. It was in force for 67 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, 7:53 PM EDT (23:53 UTC)
Expired: Mar 31, 2021, 9:00 PM EDT
In force: 67 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Berkeley County, SC, Charleston County, SC

The radar

The Wilmington radar (KLTX), 141 km from the middle of the area, began a volume at 23:55 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, 7:53 PM EDT	HAIL 0.75	7 Nne Goose Creek, SC	TIME ESTIMATED BASED ON RADAR.
Mar 31, 7:55 PM EDT	HAIL 0.75	4 N Goose Creek, SC	PENNY SIZED HAIL REPORTED.

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 12:00Z, 11.9 hours before the alert went out and 49 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 717 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 567 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

265 
WUUS52 KCHS 312353
SVRCHS
SCC015-019-010100-
/O.NEW.KCHS.SV.W.0011.210331T2353Z-210401T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Charleston SC
753 PM EDT Wed Mar 31 2021

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 900 PM EDT.

* At 753 PM EDT, a severe thunderstorm was located near Goose Creek,
  moving northeast at 35 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...
  Goose Creek, McClellanville, Jamestown, Huger and Hampton
  Plantation State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. If this is not possible, avoid open outdoor
spaces and remain low. Stay away from tall objects such as trees and
utility poles.

Report damage directly to the Charleston National Weather Service at
888-383-2024 when it is safe to do so.

&&

LAT...LON 3297 8002 3309 8009 3331 7968 3327 7956
      3325 7953 3324 7949 3325 7948 3323 7948
      3324 7946 3322 7945 3322 7944 3318 7940
      3312 7935
TIME...MOT...LOC 2353Z 243DEG 29KT 3305 7999 

HAIL...1.00IN
WIND...60MPH
 
$$

SPR

3 follow-up statements

453 
WWUS52 KCHS 010013 RRA
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
813 PM EDT Wed Mar 31 2021

SCC015-019-010100-
/O.CON.KCHS.SV.W.0011.000000T0000Z-210401T0100Z/
Charleston SC-Berkeley SC-
813 PM EDT Wed Mar 31 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR CHARLESTON AND BERKELEY COUNTIES...

At 813 PM EDT, a severe thunderstorm was located over Huger, moving
northeast at 35 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and powerlines.

Locations impacted include...
Goose Creek, McClellanville, Jamestown, Huger and Hampton Plantation
State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Report damage directly to the Charleston National Weather Service at
888-383-2024 when it is safe to do so.

&&

LAT...LON 3297 8002 3309 8009 3331 7968 3327 7956
      3325 7953 3324 7949 3325 7948 3323 7948
      3324 7946 3322 7945 3322 7944 3318 7940
      3312 7935
TIME...MOT...LOC 0013Z 243DEG 29KT 3312 7982 

HAIL...0.75IN
WIND...60MPH
 
$$

SPR

620 
WWUS52 KCHS 010034
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
834 PM EDT Wed Mar 31 2021

SCC015-019-010100-
/O.CON.KCHS.SV.W.0011.000000T0000Z-210401T0100Z/
Charleston SC-Berkeley SC-
834 PM EDT Wed Mar 31 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR CHARLESTON AND BERKELEY COUNTIES...

At 833 PM EDT, severe thunderstorms were located along a line
extending from Crowfield Plantation to near Huger to 7 miles west of
McClellanville, moving east at 25 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and powerlines.

Locations impacted include...
Goose Creek, McClellanville, Jamestown, Huger and Hampton Plantation
State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with these storms.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

Report damage directly to the Charleston National Weather Service at
888-383-2024 when it is safe to do so.

&&

LAT...LON 3297 8002 3309 8009 3331 7968 3327 7956
      3325 7953 3324 7949 3325 7948 3323 7948
      3324 7946 3322 7945 3322 7944 3318 7940
      3312 7935
TIME...MOT...LOC 0033Z 271DEG 20KT 3301 8003 3306 7984 3312 7960 

HAIL...0.75IN
WIND...60MPH
 
$$

SPR

851 
WWUS52 KCHS 010058
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
858 PM EDT Wed Mar 31 2021

SCC015-019-010108-
/O.EXP.KCHS.SV.W.0011.000000T0000Z-210401T0100Z/
Charleston SC-Berkeley SC-
858 PM EDT Wed Mar 31 2021

...THE SEVERE THUNDERSTORM WARNING FOR CHARLESTON AND BERKELEY
COUNTIES WILL EXPIRE AT 900 PM EDT...
                
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.  However gusty winds
and heavy rain are still possible with these thunderstorms.

LAT...LON 3297 8002 3309 8009 3331 7968 3327 7956
      3325 7953 3324 7949 3325 7948 3323 7948
      3324 7946 3322 7945 3322 7944 3318 7940
      3312 7935
TIME...MOT...LOC 0058Z 243DEG 29KT 3310 7982 3315 7963 3321 7939 

$$

SPR

The office that day

Everything else NWS Charleston, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 30, 9:08 PM EDT	Coastal Flood Statement	CHS		3 hr
Mar 31, 3:17 AM EDT	Small Craft Advisory	CHS		65 hr
Mar 31, 11:32 AM EDT	Marine Dense Fog Advisory	CHS		6 hr
Mar 31, 2:05 PM EDT	Small Craft Advisory	CHS		6 hr
Mar 31, 4:04 PM EDT	Special Weather Statement	CHS	Allendale	26 min
Mar 31, 4:26 PM EDT	Special Weather Statement	CHS	Allendale	34 min
Mar 31, 4:57 PM EDT	Special Weather Statement	CHS	Dorchester	33 min
Mar 31, 5:32 PM EDT	Severe Thunderstorm Warning	CHS	Colleton, Dorchester	58 min
Mar 31, 5:58 PM EDT	Severe Thunderstorm Warning	CHS	Berkeley, Colleton, Dorchester	62 min
Mar 31, 6:37 PM EDT	Special Weather Statement	CHS	Berkeley	23 min
Mar 31, 7:34 PM EDT	Special Weather Statement	CHS	Berkeley	26 min
Mar 31, 7:37 PM EDT	Special Weather Statement	CHS	Colleton	23 min
Mar 31, 7:54 PM EDT	Severe Thunderstorm Warning	CHS	Charleston, Colleton, Dorchester	66 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2021 Every 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.