Severe Thunderstorm Warning 55, NWS Charleston, SC

743 
WWUS52 KCHS 122103
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
503 PM EDT Wed Aug 12 2020

SCC049-053-122130-
/O.CON.KCHS.SV.W.0055.000000T0000Z-200812T2130Z/
Hampton SC-Jasper SC-
503 PM EDT Wed Aug 12 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM EDT
FOR HAMPTON AND JASPER COUNTIES...

At 503 PM EDT, a severe thunderstorm was located over Lake Warren
State Park, moving south at 10 mph.

HAZARD...60 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect damage to trees and powerlines.

Locations impacted include...
Hampton, Lake Warren State Park, Varnville, Estill, Brunson, Gifford,
Furman, Luray, Crocketville, Lena, Grays, Pineland, Early Branch,
Cummings and Almeda Intersection.

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
1-888-383-2024 when it is safe to do so.

&&

LAT...LON 3272 8090 3259 8118 3283 8128 3290 8121
      3292 8118 3293 8114 3295 8109
TIME...MOT...LOC 2103Z 347DEG 10KT 3282 8114 

HAIL...0.75IN
WIND...60MPH
 
$$

057 
WWUS52 KCHS 122128
SVSCHS

Severe Weather Statement
National Weather Service Charleston SC
528 PM EDT Wed Aug 12 2020

SCC049-053-122138-
/O.EXP.KCHS.SV.W.0055.000000T0000Z-200812T2130Z/
Hampton SC-Jasper SC-
528 PM EDT Wed Aug 12 2020

...THE SEVERE THUNDERSTORM WARNING FOR HAMPTON AND JASPER COUNTIES
WILL EXPIRE AT 530 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore the warning will be allowed to expire.

LAT...LON 3272 8090 3259 8118 3283 8128 3290 8121
      3292 8118 3293 8114 3295 8109
TIME...MOT...LOC 2128Z 332DEG 10KT 3276 8110 

$$

Area Forecast Discussion
National Weather Service Charleston SC
436 PM EDT Wed Aug 12 2020

.SYNOPSIS...
A trough of low pressure will persist inland, while high
pressure remains over the Atlantic through late week. A weak
cold front could approach the region over the weekend and
linger in the vicinity into early next week.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
The main synoptic pattern is dominated by a subtropical high in
the Atlantic and a trough inland over the Ohio Valley. The
mechanisms for convective initiation this afternoon will be
influenced by the inland advancing sea breeze boundary, a weak
mid-level trough, and outflow boundaries that could further
initiate and dictate locations of new convection.

The best coverage for showers and thunderstorms will be inland
and along I-95. Models indicate low-level convergence prevalent
over the Charleston Tri-County region due to the weak surface
low. Models hone in on that area receiving slightly greater
coverage with likely PoPs in that region in the
afternoon/evening. MUCAPE could reach up to 3000-3500 J/kg in
some locations, while MLCAPE tops out at around 2000 J/kg. PWATS
remain near 2 inches. Mid and upper- level steering flow is
weak, thus any showers/t-storms that develop will be slow-
moving and could produce locally heavy rainfall. The severe
potential is on the low end, yet a strong to severe thunderstorm
cannot be ruled out. The main hazard will be for potential
strong downdrafts and gusty winds within these storms
considering DCAPE values are near 1000 J/kg.

Max temps should reach around 91-94 degrees this afternoon. however,
convection could alter the natural diurnal temperature curve in the
late afternoon in places where rain has fallen. Coastline
communities should expect to see highs in the mid 80s and lows
in the mid to upper 70s tonight. Heat indices should max out
near 100-105F.

Tonight: Since there is still the weakness aloft and the nearby
weak surface low, given considerable moisture and sufficient
instability, convection could continue throughout the night.
Coverage should decline and over land and move offshore, north
of the Charleston region as these disturbances propagate to the
northeast.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH SATURDAY/...
A weak upper trough will remain positioned over the eastern
United States through Saturday while at the surface Atlantic
high pressure remains offshore. An unseasonably moist airmass
will linger with Precipitable Water values in excess of 2".
Fairly good coverage of showers and tstms is expected through
the period, particularly from late morning through early
evening. However, due to the upper trough overhead, convection
could initiate any time of day so we maintained chance PoPs
through the overnight hours as well. Daytime highs will range
from 89 to 93 degrees with max heat indices 100-105F.

&&

.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
A weak front will stall over or near the region through early next
week. Aloft, a shortwave trough over the Southeast will get absorbed
in a larger scale trough becoming more amplified over the eastern
half of the country. Vort energy and forcing from the surface
boundary and afternoon sea breeze will support mention of showers
and thunderstorms in the forecast each day. Coverage will be
dependent on where the boundary is located, so for now have kept
rain chances below 50% as there are still discrepancies between
model solutions. Temperatures will be near climo.

&&

.AVIATION /20Z WEDNESDAY THROUGH MONDAY/...
VFR at both terminals. Scattered showers and thunderstorms could
present flight restrictions mainly in the afternoon/evening.
VCTS is present at both terminals through 01Z Thursday, while a
TEMPO group is in place at KCHS from 19Z to 21Z. Amendments may
be needed as confidence in showers/t-storm locations is low.

Extended Aviation Outlook: Flight restrictions possible in
showers/thunderstorms each day, mainly in the afternoon/evening.

&&

.MARINE...
Today and tonight: A broad trough will persist
inland over the Southeast, as the Atlantic ridge holds in place
nearby to our south and east. Sea breeze influences, plus the
nocturnal low level jet will allow for SW winds around 10 to
15kt, while seas will hold at 2 to 3 ft. Mariners are advised
that a few of the t-storms that occur will produce gusty winds,
frequent lightning strikes and heavy rains reducing visibilities
to near zero at times.

Atlantic high pressure will remain in place through the
weekend, maintaining modest south to southwest flow across the
marine area. Outside of occasional showers/thunderstorms, no
marine concerns are anticipated as winds stay 15 knots or less
and seas no higher than 3 feet.

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None.
SC...None.
MARINE...None.

&&

NEAR TERM...BRM
SHORT TERM...JRL
LONG TERM...ETM
AVIATION...BRM/JRL
MARINE...BRM/JRL

Hazardous Weather Outlook
National Weather Service Charleston SC
352 AM EDT Wed Aug 12 2020

AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040-
042>045-047>052-130800-
Charleston Harbor-
Waters from South Santee River to Edisto Beach SC out 20 NM-
Waters from Edisto Beach SC to Savannah GA out 20 NM-
Waters from Savannah GA to Altamaha Sound GA out 20 NM, including
Grays Reef National Marine Sanctuary-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans-
Inland Bryan-Coastal Bryan-Inland Chatham-Coastal Chatham-Long-
Inland Liberty-Coastal Liberty-Inland McIntosh-Coastal McIntosh-
Allendale-Hampton-Inland Colleton-Dorchester-Inland Berkeley-
Inland Jasper-Beaufort-Coastal Colleton-Charleston-Coastal Jasper-
Tidal Berkeley-
352 AM EDT Wed Aug 12 2020

This Hazardous Weather Outlook is for Atlantic coastal waters,
southeast Georgia and southeast South Carolina.

.DAY ONE...Today and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1042 AM EDT WED AUG 12 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0813 PM     TSTM WND DMG     2 SW HINESVILLE         31.83N  81.62W
08/11/2020                   LIBERTY            GA   SOCIAL MEDIA

            PICTURE SHARED VIA SOCIAL MEDIA OF ROOF DAMAGE TO A CAR
            WASH. TIME ESTIMATED FROM RADAR.

&&

EVENT NUMBER CHS2000619

CPM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHARLESTON SC
1044 AM EDT WED AUG 12 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0802 PM     TSTM WND DMG     HINESVILLE              31.84N  81.59W
08/11/2020                   LIBERTY            GA   SOCIAL MEDIA

            PICTURE SHARED VIA SOCIAL MEDIA OF DAMAGE TO A GARAGE
            DOOR AT A CAR DEALERSHIP. TIME ESTIMATED FROM RADAR.

&&

EVENT NUMBER CHS2000620

CPM