Severe Thunderstorm Warning 74, NWS Charleston, SC

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WWUS52 KCHS 062018
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Severe Weather Statement
National Weather Service Charleston SC
418 PM EDT THU JUL 6 2017

GAC183-267-062100-
/O.CON.KCHS.SV.W.0074.000000T0000Z-170706T2100Z/
Long GA-Tattnall GA-
418 PM EDT THU JUL 6 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR LONG AND TATTNALL COUNTIES...

At 418 PM EDT, a severe thunderstorm was located 14 miles southeast
of Reidsville, moving northeast 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...
Glennville, Mendes, Lynn, Five Points and Donald. 

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 3212 8208 3204 8183 3199 8180 3198 8178
      3195 8175 3174 8191 3176 8192 3176 8195
      3179 8195 3179 8199 3182 8202 3181 8203
      3186 8211 3190 8211 3189 8213 3191 8213
      3190 8215
TIME...MOT...LOC 2018Z 215DEG 10KT 3190 8201 

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

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Severe Weather Statement
National Weather Service Charleston SC
430 PM EDT THU JUL 6 2017

GAC183-267-062039-
/O.CAN.KCHS.SV.W.0074.000000T0000Z-170706T2100Z/
Long GA-Tattnall GA-
430 PM EDT THU JUL 6 2017

...THE SEVERE THUNDERSTORM WARNING FOR LONG AND TATTNALL COUNTIES IS
CANCELLED...
                
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 has been cancelled.  However heavy rain is
still possible with this thunderstorm.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Charleston.

LAT...LON 3212 8208 3204 8183 3199 8180 3198 8178
      3195 8175 3174 8191 3176 8192 3176 8195
      3179 8195 3179 8199 3182 8202 3181 8203
      3186 8211 3190 8211 3189 8213 3191 8213
      3190 8215
TIME...MOT...LOC 2026Z 215DEG 10KT 3193 8199 

$$

Area Forecast Discussion
National Weather Service Charleston SC
359 PM EDT Thu Jul 6 2017

.SYNOPSIS...
Atlantic high pressure will prevail through Friday. A weak cold
front will then approach the area Saturday into Sunday.
Atlantic high pressure will return early next week.

&&

.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
Until Sunset: Radar shows an area of showers and thunderstorms
moving/developing across portions of southeast GA. Temperatures
well into the mid 90s combined with dew points inching towards
the mid 70s has given the atmosphere ample instability. SPC
Mesoscale Analysis shows MLCAPEs approaching 3,000 J/kg in this
area with steep low-level lapse rates. This is even before the
sea breeze, currently near the coast, has fully marched inland.
CAMs continue to indicate that isolated to scattered
showers/thunderstorms will develop near the sea breeze over the
next few hours. DCAPEs are forecasted to remain between
1,200-1,400 J/kg during at this time, meaning the strongest
storms could generate damaging wind gusts.

Tonight: Convection will dissipate during the late evening
hours. The mid-level ridge with its east to west axis aligned
just south of our area will is expected to lead to dry
conditions overnight. The combination of thickness values, SW
winds, and some debris clouds from earlier convection should
limit cooling. Lows will range from the mid 70s far inland to
near 80 degrees at the beaches.

&&

.SHORT TERM /6 AM FRIDAY MORNING THROUGH SUNDAY/...
Friday and Saturday: Atlantic high pressure will gradually retreat
over the western Atlantic while low pressure shifts over the Mid-
Atlantic states and enhances a piedmont trough inland. The overall
trend will favor warm conditions and slightly greater coverage of
showers/thunderstorms through the weekend, particularly over inland
areas of Southeast South Carolina Friday afternoon/evening, then
over much of the area Saturday afternoon/evening well ahead of a
weak cold front slowly approaching from the northwest. Despite
fairly poor mid-lvl lapse rates, lifted index values between -4 to
-7 C, SBCAPE around 2500 J/kg, DCAPE between 1800-2000 J/kg and
PWATs up to 2.0 inches could support a few stronger pulse/multicell
type thunderstorms capable of producing damaging wind gusts along
and south of the approaching front Saturday afternoon/evening.
Overall, high temps should peak in the mid 90s away from the
immediate coast each afternoon. Overnight lows will be mild, ranging
in the mid/upper 70s.

Sunday: A weak cold front will attempt to push into the region, but
could stall and/or dissipate near the area to start off next week.
Given a slight uptick in forcing, PWATs remaining near 2.0 inches
and SBCAPE between 2000-2500 J/kg over coastal areas and much of
Southeast Georgia, chances of showers/thunderstorms will remain in
the forecast. Greatest chances of precip appear to be in Southeast
Georgia along the coast. High temps should be a degree or two cooler
than previous days given greater cloud cover associated with
shower/thunderstorm activity. In general, afternoon highs will peak
in the low 90s away from the immediate coast.

&&

.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
The weak cold front will dissipate by Monday as Bermuda high
rebuilds through much of next week. Weak upper troughing may
allow for slightly more diurnal convection. Temperatures will
be near normal.

&&

.AVIATION /20Z THURSDAY THROUGH TUESDAY/...
CHS: VFR. There is a small risk of a shower or thunderstorm
into this evening, but not enough confidence to warrant
inclusion in the current TAF. Additionally, any wind gusts are
expected to end around 01Z as the atmosphere stabilizes.

SAV: VFR. There is a risk of a shower or thunderstorm into this
evening. Amendments to the TAF may be needed to include VCTS
and/or TEMPO flight restrictions. But this will be highly dependent
on radar trends over the next 2-3 hours. The risk for storms will
diminish overnight.

Extended Aviation Outlook: Brief flight restrictions are possible
during showers/thunderstorms at both KSAV and KCHS, mainly in
afternoon/evening hours.

&&

.MARINE...
Tonight: A cold front will move southward from the Ohio River
Valley to the Tennessee Valley. This approaching feature will
interact with surface high pressure centered over the western
Atlantic, causing a slight increase in the pressure gradient. S
to SW winds are forecast to strengthen to 15-20 kts, especially
across AMZ350. Gusts could approach 25 kt there at times,
especially beyond 15 nm. But the duration and areal coverage is
not expected to be high enough to warrant a Small Craft
Advisory. Seas should build to 3-4 ft, highest further offshore.

Friday through Tuesday: Winds/seas should remain below Small Craft
Advisory levels through the period while Atlantic high pressure
prevails. However, a slight pinching of the gradient could support
wind gusts as high as 20-25 kts and seas up to 4-5 ft in northern SC
waters Friday evening/night well ahead of a cold front that attempts
to reach coastal waters late Saturday into Sunday. Atlantic high
pressure should then dominate the pattern early next week. In
general, south/southwest winds will peak near 15-20 kts over most
waters, then gradually improve to 10-15 kt early next week. Seas
will range between 2-4 ft this weekend, then slowly subside to 1-3
ft early next week.

&&

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

&&

NEAR TERM...
SHORT TERM...
LONG TERM...JRL
AVIATION...
MARINE...

Hazardous Weather Outlook
National Weather Service Charleston SC
325 PM EDT Thu Jul 6 2017

AMZ330-350-352-354-374-GAZ087-088-099>101-114>119-137>141-SCZ040-
042>045-047>052-071930-
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 extending 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-
325 PM EDT Thu Jul 6 2017

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

.DAY ONE...Tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

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
1129 AM EDT THU JUL 06 2017

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

0931 PM     TSTM WND DMG     1 SE PORT WENTWORTH     32.14N  81.16W
07/05/2017                   CHATHAM            GA   EMERGENCY MNGR

            CHATHAM EMERGENCY MANAGEMENT REPORTED MINOR ROOF DAMAGE
            TO TRAILER OF BUSINESS ON GRANGE ROAD.

&&

EVENT NUMBER CHS1700397

TIMTE

Special Weather Statement
National Weather Service Charleston SC
353 PM EDT THU JUL 6 2017

GAZ114-137-062045-
Tattnall-Long-
353 PM EDT THU JUL 6 2017

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF LONG AND TATTNALL
COUNTIES...

At 353 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm 9 miles southwest of Glennville, or 12 miles
northeast of Surrency, moving northeast at 15 mph.

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

  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 this storm include...
Reidsville, Glennville, Gordonia Altamaha State Park and Mendes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Report damage directly to the Charleston National Weather Service at
1-888-383-2024 when it is safe to do so. You can also email your
report to nws.charlestonsc@noaa.gov.

&&

LAT...LON 3204 8221 3218 8217 3195 8176 3178 8198
      3182 8202 3181 8203 3187 8211 3191 8213
      3190 8215 3191 8222 3194 8222
TIME...MOT...LOC 1953Z 203DEG 12KT 3185 8206