Alert archive / South Carolina / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 35, NWS Charleston, SC

July 7, 2021Beaufort County, Colleton County, Jasper County, South Carolina

NWS Charleston, SC issued this severe thunderstorm warning at Jul 7, 2021, 11:23 PM EDT for Beaufort County, Colleton County, Jasper County, South Carolina. It was in force for 67 min. 4 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: Jul 7, 2021, 11:23 PM EDT (03:23 UTC)
Expired: Jul 8, 2021, 12:30 AM EDT
In force: 67 min
Issued by: NWS Charleston, SC
Area: Storm-based polygon
Hail: 0.75 in
Wind: 80.0 mph

Counties Beaufort County, SC, Colleton County, SC, Jasper County, SC

The radar

The Charleston,SC radar (KCLX), 55 km from the middle of the area, began a volume at 03:27 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
Jul 7, 11:44 PM EDT	TORNADO	2 Sse Parris Island, SC	A NATIONAL WEATHER SERVICE STORM SURVEY CONFIRMED TORNADO DAMAGE ON PARRIS ISLAND, SC. TIME ESTIMATED FROM RADAR DATA.
Jul 7, 11:50 PM EDT	TORNADO	Port Royal, SC	A NATIONAL WEATHER SERVICE STORM SURVEY CONFIRMED TORNADO DAMAGE IN PORT ROYAL, SC. THE TIME WAS ESTIMATED FROM RADAR DATA.
Jul 7, 11:51 PM EDT	TSTM WND DMG	Port Royal, SC	MILTIPLE TREES DOWN, TREES ON HOUSES, POWER LINES DOWN, AND POWER OUTAGES. DAMAGE EXTENDED ACROSS THE RIVER INTO BURTON. POSSIBLE TORNADO.
Jul 7, 11:51 PM EDT	TSTM WND DMG	Port Royal, SC	MULTIPLE TREES DOWN, TREES ON HOUSES, POWER LINES DOWN, AND POWER OUTAGES. DAMAGE EXTENDED ACROSS THE RIVER INTO BURTON. POSSIBLE TORNADO.

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
Jul 7, 7:25 PM EDT	Tornado Watch	SPC	11 hr

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 3.4 hours before the alert went out and 89 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: 1185 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 801 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 63 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

417 
WUUS52 KCHS 080323
SVRCHS
SCC013-029-053-080430-
/O.NEW.KCHS.SV.W.0035.210708T0323Z-210708T0430Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Charleston SC
1123 PM EDT Wed Jul 7 2021

The National Weather Service in Charleston has issued a

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

* Until 1230 AM EDT.

* At 1123 PM EDT, severe thunderstorms with damaging winds were 
  located over Forest Beach, moving northeast at 45 mph.

  This is a very dangerous storm.

  HAZARD...80 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be heavily damaged. Expect 
           considerable damage to roofs, windows, and vehicles. 
           Extensive tree damage and power outages are likely.

* Locations impacted include...
  Hilton Head Island, Bluffton, Beaufort, Port Royal, Edisto Beach,
  Clarendon, Bennetts Point, Fripp Island, Lemon Island, Rose Hill,
  Sun City, Shell Point, Burton, Calawassie Island and Laurel Bay.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This is an EXTREMELY DANGEROUS SITUATION with tornado like wind
speeds expected. Mobile homes and high profile vehicles are
especially susceptible to winds of this magnitude and may be
overturned. For your protection move to an interior room on the
lowest floor of a building. This storm has the potential to cause
serious injury and significant property damage.

&&

LAT...LON 3223 8107 3268 8058 3246 8031 3241 8034
      3244 8041 3237 8040 3230 8041 3225 8058
      3212 8072 3207 8083 3205 8086
TIME...MOT...LOC 0323Z 216DEG 39KT 3213 8079 

HAIL...<.75IN
WIND...80MPH
 
$$

SPR

1 follow-up statement

512 
WWUS52 KCHS 080422
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
1222 AM EDT Thu Jul 8 2021

SCC013-029-053-080431-
/O.EXP.KCHS.SV.W.0035.000000T0000Z-210708T0430Z/
Beaufort SC-Colleton SC-Jasper SC-
1222 AM EDT Thu Jul 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR PORTIONS OF BEAUFORT...
COLLETON AND JASPER COUNTIES WILL EXPIRE AT 1230 AM EDT...
                
The storm which prompted the warning has weakened below severe
limits. Therefore the warning will be allowed to expire. 

A Tropical Storm Warning remains in effect. 

LAT...LON 3223 8107 3268 8058 3246 8031 3241 8034
      3244 8041 3237 8040 3230 8041 3225 8058
      3212 8072 3207 8083 3205 8086
TIME...MOT...LOC 0421Z 216DEG 39KT 3289 8036 

$$

SPR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 7, 9:03 PM EDT	Special Marine Warning	CHS		117 min
Jul 7, 9:23 PM EDT	Areal Flood Advisory	CHS	Jasper	82 min
Jul 7, 10:39 PM EDT	Areal Flood Advisory	CHS	Beaufort, Jasper	81 min
Jul 7, 10:46 PM EDT	Special Marine Warning	CHS		89 min
Jul 7, 10:58 PM EDT	Special Marine Warning	CHS		32 min
Jul 7, 11:39 PM EDT	Tornado Warning	CHS	Beaufort, Jasper	36 min
Jul 7, 11:48 PM EDT	Special Marine Warning	CHS		87 min
Jul 8, 12:10 AM EDT	Areal Flood Advisory	CHS	Beaufort, Charleston, Colleton, Hampton, Jasper	3 hr
Jul 8, 12:23 AM EDT	Tornado Warning	CHS	Beaufort, Colleton	37 min
Jul 8, 12:49 AM EDT	Special Marine Warning	CHS		56 min
Jul 8, 12:57 AM EDT	Special Marine Warning	CHS		93 min
Jul 8, 12:59 AM EDT	Tornado Warning	CHS	Charleston	31 min
Jul 8, 1:08 AM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston	5 hr
Jul 8, 1:36 AM EDT	Tornado Warning	CHS	Charleston	24 min
Jul 8, 1:50 AM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston, Colleton, Dorchester	115 min
Jul 8, 1:54 AM EDT	Special Marine Warning	CHS		2 hr
Jul 8, 2:13 AM EDT	Special Weather Statement	CHS	Colleton	32 min
Jul 8, 2:21 AM EDT	Special Marine Warning	CHS		114 min
Jul 8, 2:23 AM EDT	Tornado Warning	CHS	Charleston	37 min
Jul 8, 2:30 AM EDT	Special Marine Warning	CHS		78 min
Jul 8, 2:49 AM EDT	Tornado Warning	CHS	Berkeley, Charleston	26 min
Jul 8, 3:08 AM EDT	Tornado Warning	CHS	Berkeley	39 min
Jul 8, 3:16 AM EDT	Tornado Warning	CHS	Berkeley, Charleston	14 min
Jul 8, 3:36 AM EDT	Special Weather Statement	CHS	Dorchester	24 min
Jul 8, 3:58 AM EDT	Special Weather Statement	CHS	Dorchester	32 min
Jul 8, 4:05 AM EDT	Special Marine Warning	CHS		85 min
Jul 8, 4:16 AM EDT	Tornado Warning	CHS	Berkeley, Charleston	44 min
Jul 8, 8:05 AM EDT	Small Craft Advisory	CHS		14 hr

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.