Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 52, NWS Charleston, SC

December 30, 2021Berkeley County, Charleston County, Dorchester County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Dec 30, 2021, 4:55 PM EST for Berkeley County, Charleston County, Dorchester County, South Carolina. It was in force for 32 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: Dec 30, 2021, 4:55 PM EST (21:55 UTC)
Expired: Dec 30, 2021, 5:27 PM EST
In force: 32 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, Dorchester County, SC

The radar

The Charleston,SC radar (KCLX), 83 km from the middle of the area, began a volume at 21:57 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
Dec 30, 5:05 PM EST	HAIL 0.75	Summerville, SC
Dec 30, 5:10 PM EST	HAIL 1	2 Sse Knightsville, SC	A SPOTTER REPORTED QUARTER SIZE HAIL NEAR THE INTERSECTION OF BOONE HILL AND OLD ORANGEBURG RD.

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, 9.9 hours before the alert went out and 32 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: 225 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 599 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

464 
WUUS52 KCHS 302155
SVRCHS
SCC015-019-035-302245-
/O.NEW.KCHS.SV.W.0052.211230T2155Z-211230T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Charleston SC
455 PM EST Thu Dec 30 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...
  Dorchester County in southeastern South Carolina...

* Until 545 PM EST.

* At 454 PM EST, a severe thunderstorm was located over Givhans Ferry
  State Park, moving east at 50 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:
  North Charleston, Summerville, Goose Creek, Ladson, Givhans Ferry
  State Park, Ridgeville, Givhans, Sangaree, Crowfield Plantation,
  Jedburg, Knightsville and College Park.

This warning includes I-26 between mile markers 192 and 205.
 
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 3318 8001 3300 7992 3295 8041 3297 8042
      3302 8041 3304 8039 3305 8040 3305 8044
      3306 8046
TIME...MOT...LOC 2154Z 261DEG 42KT 3303 8037 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

2 follow-up statements

616 
WWUS52 KCHS 302210
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
510 PM EST Thu Dec 30 2021

SCC015-019-035-302245-
/O.CON.KCHS.SV.W.0052.000000T0000Z-211230T2245Z/
Charleston SC-Berkeley SC-Dorchester SC-
510 PM EST Thu Dec 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EST
FOR PORTIONS OF CHARLESTON...BERKELEY AND DORCHESTER COUNTIES...

At 509 PM EST, a severe thunderstorm was located over Summerville,
moving east at 45 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: 
North Charleston, Summerville, Goose Creek, Ladson, Sangaree,
Crowfield Plantation, Knightsville and College Park.

This warning includes I-26 between mile markers 196 and 205.
 
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 3318 8001 3300 7992 3296 8027 3299 8026
      3308 8021
TIME...MOT...LOC 2209Z 275DEG 40KT 3301 8017 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

154 
WWUS52 KCHS 302227
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
527 PM EST Thu Dec 30 2021

SCC015-019-035-302236-
/O.CAN.KCHS.SV.W.0052.000000T0000Z-211230T2245Z/
Charleston SC-Berkeley SC-Dorchester SC-
527 PM EST Thu Dec 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR PORTIONS OF CHARLESTON...
BERKELEY AND DORCHESTER COUNTIES IS CANCELLED...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning has been cancelled.

Report damage directly to the Charleston National Weather Service at 
888-383-2024 when it is safe to do so. You can also email your 
report to nws.charlestonsc@noaa.gov.

LAT...LON 3318 8001 3300 7992 3296 8027 3299 8026
      3308 8021
TIME...MOT...LOC 2224Z 261DEG 42KT 3304 7993 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 30, 2:46 PM EST	Special Weather Statement	CHS	Berkeley	29 min
Dec 30, 3:25 PM EST	Special Weather Statement	CHS	Allendale	35 min
Dec 30, 4:00 PM EST	Special Weather Statement	CHS	Colleton	30 min
Dec 30, 4:11 PM EST	Severe Thunderstorm Warning	CHS	Colleton	25 min
Dec 30, 4:27 PM EST	Special Weather Statement	CHS	Allendale	48 min
Dec 30, 4:49 PM EST	Special Weather Statement	CHS	Berkeley	26 min
Dec 30, 5:40 PM EST	Special Weather Statement	CHS	Hampton	35 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.