Alert archive / South Carolina / Special Weather Statements in 2021

Special Weather Statement, NWS Charleston, SC

July 31, 2021Charleston County, South Carolina

NWS Charleston, SC issued this special weather statement at Jul 31, 2021, 3:25 PM EDT for Charleston County, South Carolina. It was in force for 35 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: Jul 31, 2021, 3:25 PM EDT (19:25 UTC)
Expired: Jul 31, 2021, 4:00 PM EDT
In force: 35 min
Issued by: NWS Charleston, SC
Hail: 0.00 in
Wind: 55

County Charleston County, SC

The radar

The Wilmington radar (KLTX), 147 km from the middle of the area, began a volume at 19:26 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 12:00Z, 7.4 hours before the alert went out and 47 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: 2518 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 924 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 9 m²/s²
0-3 km storm-relative helicity: 67 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

161 
WWUS82 KCHS 311925
SPSCHS

Special Weather Statement
National Weather Service Charleston SC
325 PM EDT Sat Jul 31 2021

SCZ050-312000-
Charleston-
325 PM EDT Sat Jul 31 2021

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CHARLESTON COUNTY...

At 325 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Santee Coastal
Reserve to Awendaw, and moving southeast at 10 mph.

HAZARD...strong winds 45 to 55 mph and excessive cloud to ground 
         lightning.

SOURCE...Radar Indicated.

IMPACT...Expect minor damage to tree limbs and blowing around of 
         light, unsecured objects. All outdoor activities should 
         cease. Move indoors immediately.

Some locations in the path of these storms include...
Mount Pleasant, McClellanville, Isle Of Palms, Awendaw, Boone Hall
Plantation, Garris Landing, Mount Pleasant Regional Airport and
Hampton Plantation State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms and may lead
to flooding of low lying and poor drainage areas. Do not drive your
vehicle through flooded roadways.

Excessive cloud to ground lightning is occurring with these storms.
Lightning can strike 15 miles away from a thunderstorm. Seek safe
shelter inside a building or vehicle.

&&

LAT...LON 3307 7931 3299 7933 3298 7951 3288 7955
      3276 7979 3288 7986 3293 7981 3295 7977
      3298 7977 3313 7962 3316 7956 3314 7952
      3321 7947 3321 7945 3316 7937 3314 7927
      3310 7927
TIME...MOT...LOC 1925Z 306DEG 10KT 3313 7932 3298 7966 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 8:01 PM EDT	Heat Advisory	CHS	Berkeley, Colleton, Dorchester	24 hr
Jul 31, 3:50 PM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston	115 min
Jul 31, 4:00 PM EDT	Special Weather Statement	CHS	Berkeley	30 min
Jul 31, 4:01 PM EDT	Small Craft Advisory	CHS		32 hr
Jul 31, 4:06 PM EDT	Special Weather Statement	CHS	Berkeley	24 min
Jul 31, 4:29 PM EDT	Special Weather Statement	CHS	Colleton	31 min
Jul 31, 4:38 PM EDT	Special Weather Statement	CHS	Charleston	37 min
Jul 31, 4:51 PM EDT	Special Marine Warning	CHS		57 min
Jul 31, 4:53 PM EDT	Special Weather Statement	CHS	Charleston	37 min
Jul 31, 5:04 PM EDT	Severe Thunderstorm Warning	CHS	Berkeley, Charleston	34 min
Jul 31, 5:11 PM EDT	Areal Flood Advisory	CHS	Berkeley, Charleston	36 min
Jul 31, 5:26 PM EDT	Special Weather Statement	CHS	Berkeley	34 min
Jul 31, 5:37 PM EDT	Special Weather Statement	CHS	Colleton	23 min
Jul 31, 5:59 PM EDT	Special Weather Statement	CHS	Colleton	31 min
Jul 31, 6:02 PM EDT	Special Weather Statement	CHS	Berkeley	28 min
Jul 31, 6:38 PM EDT	Special Weather Statement	CHS	Berkeley	37 min
Jul 31, 6:46 PM EDT	Special Weather Statement	CHS	Dorchester	29 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.