Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS Charleston, SC

December 30, 2021Colleton County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Dec 30, 2021, 4:11 PM EST for Colleton County, South Carolina. It was in force for 25 min. 1 report 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, 4:11 PM EST (21:11 UTC)
Expired: Dec 30, 2021, 4:36 PM EST
In force: 25 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Colleton County, SC

The radar

The Charleston,SC radar (KCLX), 53 km from the middle of the area, began a volume at 21:15 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, 4:15 PM EST	HAIL 0.88	3 Ene Ashton, SC	HAIL OBSERVED ON DRY BRANCH ROAD OUTSIDE LODGE, SC. THE HAIL FELL FOR AROUND FIVE MINUTES.

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
Dec 30, 2:05 PM EST	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 12:00Z, 9.2 hours before the alert went out and 73 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.

185 
WUUS52 KCHS 302111
SVRCHS
SCC029-302215-
/O.NEW.KCHS.SV.W.0051.211230T2111Z-211230T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Charleston SC
411 PM EST Thu Dec 30 2021

The National Weather Service in Charleston has issued a

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

* Until 515 PM EST.

* At 410 PM EST, a severe thunderstorm was located over Ashton,
  moving east 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:
  Walterboro, Colleton, Smoaks, Lodge, Williams, Islandton, Ruffin,
  Padgetts, Ashton and Canadys.

This warning includes I-95 in South Carolina between mile markers 55
and 69.
 
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 3315 8070 3311 8067 3307 8062 3305 8040
      3301 8041 3281 8088 3303 8108 3310 8095
      3306 8090 3309 8088 3313 8089 3318 8079
TIME...MOT...LOC 2110Z 286DEG 18KT 3302 8093 

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

$$

NED

2 follow-up statements

723 
WWUS52 KCHS 302125
SVSCHS

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

SCC029-302215-
/O.CON.KCHS.SV.W.0051.000000T0000Z-211230T2215Z/
Colleton SC-
425 PM EST Thu Dec 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EST
FOR PORTIONS OF COLLETON COUNTY...

At 425 PM EST, a severe thunderstorm was located over Ruffin, 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: 
Walterboro, Smoaks, Williams, Canadys and Ruffin. 

This warning includes I-95 in South Carolina between mile markers 55
and 69.
 
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 3315 8070 3311 8067 3307 8062 3305 8040
      3301 8041 3281 8088 3301 8088 3309 8084
      3312 8082 3315 8078
TIME...MOT...LOC 2125Z 272DEG 33KT 3301 8078 

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

$$

NED

195 
WWUS52 KCHS 302136
SVSCHS

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

SCC029-302146-
/O.CAN.KCHS.SV.W.0051.000000T0000Z-211230T2215Z/
Colleton SC-
436 PM EST Thu Dec 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR PORTIONS OF COLLETON COUNTY 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.  However, gusty winds are
still possible with this thunderstorm.

LAT...LON 3315 8070 3311 8067 3307 8062 3305 8040
      3301 8041 3281 8088 3301 8088 3309 8084
      3312 8082 3315 8078
TIME...MOT...LOC 2135Z 286DEG 18KT 3299 8071 

$$

NED

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, 4:27 PM EST	Special Weather Statement	CHS	Allendale	48 min
Dec 30, 4:49 PM EST	Special Weather Statement	CHS	Berkeley	26 min
Dec 30, 4:55 PM EST	Severe Thunderstorm Warning	CHS	Berkeley, Charleston, Dorchester	32 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.