Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS Charleston, SC

May 11, 2021Berkeley County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at May 11, 2021, 6:33 PM EDT for Berkeley County, South Carolina. It was in force for 57 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: May 11, 2021, 6:33 PM EDT (22:33 UTC)
Expired: May 11, 2021, 7:30 PM EDT
In force: 57 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Berkeley County, SC

The radar

The Columbia radar (KCAE), 112 km from the middle of the area, began a volume at 22:33 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
May 11, 7:05 PM EDT	HAIL 0.88	Pinopolis, SC	TV MEDIA REPORTED NICKEL SIZE HAIL IN PINOPOLIS.
May 11, 7:07 PM EDT	HAIL 1	1 N Moncks Corner, SC	QUARTER SIZE HAIL LASTED 5 MINUTES. SHREDDED A CANVAS DECK COVER.

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, 10.6 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.

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: 40 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 1089 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

003 
WUUS52 KCHS 112233
SVRCHS
SCC015-112330-
/O.NEW.KCHS.SV.W.0026.210511T2233Z-210511T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Charleston SC
633 PM EDT Tue May 11 2021

The National Weather Service in Charleston has issued a

* Severe Thunderstorm Warning for portions of...
  Berkeley County in southeastern South Carolina...

* Until 730 PM EDT.

* At 632 PM EDT, a severe thunderstorm was located 7 miles southwest
  of Eastern Lake Marion, moving southeast at 20 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...
  Moncks Corner, Saint Stephen, Bonneau, Southern Lake Moultrie,
  Eadytown, Cross, Northern Lake Moultrie, Bonneau Beach, Eastern
  Lake Marion and Pinopolis.

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 3343 7987 3342 7987 3340 7985 3308 8009
      3326 8032 3330 8025 3338 8024 3339 8022
      3345 8022 3344 8021 3345 8021 3345 8020
      3346 8016 3345 8015 3347 8014
TIME...MOT...LOC 2232Z 296DEG 18KT 3338 8030 

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

DPB

1 follow-up statement

492 
WWUS52 KCHS 112300
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
700 PM EDT Tue May 11 2021

SCC015-112330-
/O.CON.KCHS.SV.W.0026.000000T0000Z-210511T2330Z/
Berkeley SC-
700 PM EDT Tue May 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR BERKELEY COUNTY...

At 700 PM EDT, a severe thunderstorm was located near Southern Lake
Moultrie, moving southeast at 25 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vehicles is possible. Expect wind 
         damage to trees and powerlines.

Locations impacted include...
Moncks Corner, Bonneau, Southern Lake Moultrie, Cross and Pinopolis. 

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 3322 8025 3337 8013 3329 7994 3308 8009
TIME...MOT...LOC 2300Z 303DEG 22KT 3326 8012 

HAIL...1.25IN
WIND...60MPH
 
$$

JRL

The office that day

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

Issued	Product	Office	Counties	Lasted
May 11, 3:21 AM EDT	Small Craft Advisory	CHS		5 days
May 11, 3:36 PM EDT	Lake Wind Advisory	CHS	Berkeley	34 hr
May 11, 7:13 PM EDT	Severe Thunderstorm Warning	CHS	Berkeley	47 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.