Alert archive / South Carolina / Special Weather Statements in 2021

Special Weather Statement, NWS Columbia, SC

August 7, 2021Clarendon County, South Carolina

NWS Columbia, SC issued this special weather statement at Aug 7, 2021, 10:44 PM EDT for Clarendon County, South Carolina. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 7, 2021, 10:44 PM EDT (02:44 UTC)
Expired: Aug 7, 2021, 11:45 PM EDT
In force: 61 min
Issued by: NWS Columbia, SC
Hail: 0.00 in
Wind: 30

County Clarendon County, SC

The radar

The Columbia radar (KCAE), 97 km from the middle of the area, began a volume at 02:46 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.

The nearest sounding before it

Charleston AFB, SC (KCHS), launched 00:00Z, 2.7 hours before the alert went out and 63 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: 1603 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 814 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 69 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

274 
WWUS82 KCAE 080244
SPSCAE

Special Weather Statement
National Weather Service Columbia SC
1044 PM EDT Sat Aug 7 2021
 
SCZ037-038-136-137-080345-
Central Orangeburg SC-Southeastern Orangeburg SC-Calhoun SC-
Clarendon SC-
1044 PM EDT Sat Aug 7 2021

...Strong thunderstorms will impact portions of southeastern Calhoun,
southern Clarendon and southeastern Orangeburg Counties through 1145
PM EDT...

At 1042 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles east of Manning to 7 miles north of
Bowman. Movement was southeast at 15 mph.

...Boaters on Lake Marion Should Seek Safe Harbor... 

HAZARD...Winds in excess of 30 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.  Periods of heavy rainfall may cause 
         minor roadway and Interstate flooding, along with 
         visibility restrictions.

Locations impacted include...
Manning, Holly Hill, Summerton, Bowman, Elloree, Santee State Park,
Santee Cooper Regional Airport, Santee, Eutawville, Vance, Poplar
Creek Landing, St. Paul, Stumphole Landing, Rocks Pond Campground and
Marina, Yonder Field, Foreston, Eautaw Springs, Indian Bluff
Recreation Park, Davis Station and Blounts Landing.

This includes the following highways...
 Interstate 26 between mile markers 152 and 169.
 Interstate 95 between mile markers 85 and 117.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

If on or near Lake Marion, get out of the water and move indoors or 
inside a vehicle. Remember, lightning can strike out to 10 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now! Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 3350 8010 3350 8012 3348 8015 3346 8013
      3345 8015 3346 8016 3345 8022 3330 8025
      3327 8030 3328 8035 3326 8036 3326 8043
      3329 8049 3333 8049 3333 8051 3324 8067
      3347 8079 3378 8005 3372 7998
TIME...MOT...LOC 0242Z 321DEG 14KT 3370 8009 3345 8072 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 9:37 PM EDT	Special Weather Statement	CAE	Calhoun	23 min
Aug 7, 9:49 PM EDT	Areal Flood Advisory	CAE	Calhoun	116 min

Nearby

Special Weather Statements in South Carolina, 2021 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.