Alert archive / South Carolina / Special Weather Statements in 2018
Special Weather Statement, NWS Charleston, SC
NWS Charleston, SC issued this special weather statement at Jun 20, 2018, 4:48 PM EDT for Jasper County, South Carolina. It was in force for 42 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
- Jun 20, 2018, 4:48 PM EDT (20:48 UTC)
- Expired
- Jun 20, 2018, 5:30 PM EDT
- In force
- 42 min
- Issued by
- NWS Charleston, SC
County Jasper County, SC
The radar
The Charleston,SC radar (KCLX), 14 km from the middle of the area, began a volume at 20:49 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, 8.8 hours before the alert went out and 87 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.
- Mixed-layer CAPE
- 1325 J/kg
- Mixed-layer CIN
- -81 J/kg
- Mixed-layer LCL
- 1082 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
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</html>What forecasters said that day
The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Charleston, SC wrote its last area forecast discussion before this special weather statement went out at Jun 20, 4:15 PM EDT, 33 minutes earlier.
Area forecast discussion, Jun 20, 4:15 PM EDT, 33 minutes before
Area Forecast Discussion
National Weather Service Charleston SC
415 PM EDT Wed Jun 20 2018
.SYNOPSIS...
The region will remain between Atlantic high pressure well the
east and an inland trough of low pressure through later this
week. The trough of low pressure is expected to settle over the
region and will likely persist into early next week. A cold
front could push into the region by the middle of next week.
&&
.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
Through this evening: Radar shows the bulk of convection along
our coastal GA counties, resulting from differential heating
boundaries. The sea breeze is heading inland and hasn't
initiated too many storms. We made minor adjustments to the POPs
for the next 2-3 hours to account for these trends, but still
have chance POPs at the highest. This is because CAMs still show
a decent amount of convection and SPC mesoanalysis plenty of
instability, especially along the immediate coastline. DCAPEs
~900 J/kg continue to mean the main threat would be damaging
wind gusts from the strongest storms.
Temperatures and dew points haven't lowered much due to the
relative lack of convection compared to what the CAMs were
showing. The result is no changes were made with the heat
advisories. If anything, dew point increases right along the sea
breeze helped heat indices rise to ~110 degrees in some
locations. But we're past peak heating and temperatures have
topped out or have started lowering. This is most noticeable
where convection is occurring.
Tonight: Any remnant convection should dissipate late this
evening, with minimal convection expected after midnight.
Otherwise, plenty of moisture in place and some clouds will keep
temperatures above normal. Expect lows to be in the upper 70s
to around 80 degrees in most locations.
&&
.SHORT TERM /6 AM THURSDAY MORNING THROUGH SATURDAY/...
The biggest change in the overall pattern through the rest of the
week and into early this weekend is that the strong mid/upper level
ridge will gradually weaken. The ridge weakens in response to a
strong upper low that models have been persistently showing will form
over the central U.S. and slowly move east-northeast toward the
lower Great Lakes by the end of the period. In addition, deep layer
moisture increases some. The combination of lower mid/upper heights,
better deep layer moisture and some vorticity advection will result
in slightly higher PoPs, generally in the chance range, each
afternoon. The difficulty is that the best moisture does not
necessarily coincide with any weak upper level forcing each day,
which is why we left chance PoPs for mainly afternoon/evening. The
best deep layer moisture looks to be Thursday, but oddly, guidance
is reflecting slightly lower PoPs. Given the lower upper
heights and the potential for some large scale weak upper forcing,
there may be a slightly higher chance for strong to low end severe
storms each afternoon. However, the chances are not enough to
mention in the forecast or HWO at this point.
Temperatures will remain well above normal, but not quite as hot as
last few days as upper heights fall by about 5 decameters. Guidance
showing considerable drop in surface dewpoint temperatures on
Thursday, which seems a little suspect, but did keep upper 60s
inland and lower to mid 70s at the coast. The combination of
slightly lower dewpoints and temperatures will lead to lower heat
indices, but still in the lower 100s likely each afternoon. Lows
very warm, in the mid to upper 70s, to around 80 at the coast.
&&
.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
The upper ridge will temporarily rebuild over the Southeast on
Sunday, causing temperatures to rise back into the middle 90s,
reducing convective coverage, and potentially requiring Heat
Advisories. A substantial upper vort max is forecast to drop
southeast into the area Monday, pushing a weak back door cold
front through the area Monday night or Tuesday. There is
increasing model agreement that temps will be a couple degrees
cooler next Tuesday and Wednesday.
&&
.AVIATION /20Z WEDNESDAY THROUGH MONDAY/...
18Z TAFs: Mainly VFR. Showers and thunderstorms have skirted
KSAV, but we will keep at least VCTS mention in there TAF
until ~22Z. Further north, convection has remained far away from
KCHS. But given the convective potential, we'll leave VCTS in
there TAF for now. Conditions are forecasted to quickly
improve late this evening as the convection decreases, with VFR
prevailing overnight.
Extended Aviation Outlook:
Through this weekend: Mostly VFR conditions. However, chances
for afternoon convection will be slightly higher through much of
the period, which will result in slightly higher chances for
brief convectively induced flight restrictions.
&&
.MARINE...
Tonight: South winds have increased due to diurnal enhancements
of the mixed layer at the beaches. Speeds should top out in the
15-20 kt range this evening, mainly within 10-15 nm. Winds are
expected to ease to the 10-15 kt range overnight. Seas will
generally average 2-4 ft.
LONG TERM MARINE...(FRIDAY THROUGH THURSDAY)...No highlights
expected through Monday. The marine area will remain between
Atlantic high pressure well to the east and lower pressure over
the land. This will produce southwest winds of mainly 15 knots
or less, highest during the afternoon and near the coast with
the sea breeze, with seas 2 to 3 feet. By the end of the
period/early next week, models are indicating the potential for
a cold front to approach from the north, which could increase
the pressure gradient enough to produce 15-20 knot winds.
&&
.CHS WATCHES/WARNINGS/ADVISORIES...
GA...Heat Advisory until 7 PM EDT this evening for GAZ087-088-
099>101-114>119-137>141.
SC...Heat Advisory until 7 PM EDT this evening for SCZ040-042>045-
047>052.
MARINE...None.
&&
NEAR TERM...
SHORT TERM...
LONG TERM...JRL
AVIATION...
MARINE...Hazardous weather outlook, Jun 20, 3:41 AM EDT, 13 hours 7 minutes before
Hazardous Weather Outlook National Weather Service Charleston SC 341 AM EDT Wed Jun 20 2018 GAZ087-088-099>101-114>119-137>141-SCZ040-042>045-047>052-211330- 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- 341 AM EDT Wed Jun 20 2018 ...HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 7 PM EDT THIS EVENING... This Hazardous Weather Outlook is for southeast Georgia and southeast South Carolina. .DAY ONE...Today and Tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Heat Advisory. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Excessive Heat: The combination of temperatures in the mid to upper 90s and moderate humidity could create heat index values exceeding 105 degrees each afternoon through Monday. Heat Advisories will likely be required. .SPOTTER INFORMATION STATEMENT... Spotter assistance is not anticipated at this time. AMZ330-350-352-354-374-211330- 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- 341 AM EDT Wed Jun 20 2018 This Hazardous Weather Outlook is for Atlantic coastal waters. .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.
In the hours before
Special weather statement, Jun 20, 3:04 PM EDT, 1 hour 44 minutes before
Special Weather Statement
National Weather Service Charleston SC
304 PM EDT WED JUN 20 2018
GAZ116>119-201945-
Coastal Chatham-Inland Chatham-Inland Bryan-Coastal Bryan-
304 PM EDT WED JUN 20 2018
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BRYAN AND CHATHAM
COUNTIES...
At 303 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm over Richmond Hill, moving east 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...
Savannah, Richmond Hill, Montgomery, Garden City, Thunderbolt,
Vernonburg, Fort Mcallister and Sandfly.
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 3193 8138 3203 8137 3208 8105 3184 8104
TIME...MOT...LOC 1903Z 268DEG 14KT 3198 8131Special weather statement, Jun 20, 3:12 PM EDT, 1 hour 36 minutes before
Special Weather Statement
National Weather Service Charleston SC
312 PM EDT WED JUN 20 2018
GAZ116-117-119-138>141-202000-
Inland McIntosh-Coastal Liberty-Inland Liberty-Coastal Chatham-Inland
Bryan-Coastal McIntosh-Coastal Bryan-
312 PM EDT WED JUN 20 2018
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BRYAN...LIBERTY...
MCINTOSH AND CHATHAM COUNTIES...
At 312 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Belfast to near
Riceboro, and moving east at 10 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 these storms include...
Riceboro, Belfast, Halfmoon Landing, Harris Neck, Retreat, Keller and
Sunbury.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Beaches are especially dangerous during thunderstorms because
lightning will usually strike the tallest object in the vicinity.
Move off beaches and get in a sturdy structure or automobile
immediately. Many people have been killed by lightning on beaches in
the southeastern United States.
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 3169 8150 3170 8149 3172 8154 3191 8132
3184 8102 3158 8122
TIME...MOT...LOC 1912Z 260DEG 7KT 3186 8132 3172 8149Special weather statement, Jun 20, 3:45 PM EDT, 1 hour 3 minutes before
Special Weather Statement
National Weather Service Charleston SC
345 PM EDT WED JUN 20 2018
GAZ101-116>119-SCZ047-048-051-202030-
Effingham-Coastal Chatham-Inland Chatham-Inland Bryan-Coastal
Bryan-Inland Jasper-Coastal Jasper-Beaufort-
345 PM EDT WED JUN 20 2018
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BRYAN...EFFINGHAM...
CHATHAM...BEAUFORT AND JASPER COUNTIES...
At 345 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Purysburgh to
near Fort Mcallister, and moving southeast 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 these storms include...
Savannah, Hilton Head Island, Pooler, Bluffton, Richmond Hill,
Wilmington Island, Fort Pulaski National Monument and Bellinger Hill
Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
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 3189 8127 3237 8122 3225 8074 3209 8080
3207 8083 3205 8084 3202 8082 3193 8085
3183 8097
TIME...MOT...LOC 1945Z 297DEG 13KT 3230 8116 3194 8120Special weather statement, Jun 20, 3:54 PM EDT, 54 minutes before
Special Weather Statement
National Weather Service Charleston SC
354 PM EDT WED JUN 20 2018
GAZ116-117-119-138>141-202045-
Inland McIntosh-Coastal Liberty-Inland Liberty-Coastal Chatham-Inland
Bryan-Coastal McIntosh-Coastal Bryan-
354 PM EDT WED JUN 20 2018
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BRYAN...LIBERTY...
MCINTOSH AND CHATHAM COUNTIES...
At 354 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from near Keller to near
Ridgeville, and moving east at 20 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 these storms include...
Darien, Wolf Island, Harris Neck, St. Catherines Island, Eulonia,
Valona, Little Saint Simons Island and South Newport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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.
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 3129 8140 3131 8144 3133 8144 3133 8147
3138 8155 3140 8157 3190 8129 3183 8097
3171 8110 3162 8110 3140 8123 3137 8122
3135 8124 3131 8122 3129 8123
TIME...MOT...LOC 1954Z 290DEG 18KT 3186 8122 3140 8136Special weather statement, Jun 20, 4:12 PM EDT, 36 minutes before
Special Weather Statement
National Weather Service Charleston SC
412 PM EDT WED JUN 20 2018
SCZ047-048-051-202045-
Inland Jasper-Coastal Jasper-Beaufort-
412 PM EDT WED JUN 20 2018
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BEAUFORT AND JASPER
COUNTIES...
At 412 PM EDT, National Weather Service doppler radar indicated a
strong thunderstorm near Jasper, or 9 miles south of Ridgeland,
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...
Ridgeland, Jasper, Calawassie Island, Grahamville, Old House, Laurel
Bay, Lemon Island and Rose Hill.
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 3234 8110 3240 8109 3260 8080 3226 8075
TIME...MOT...LOC 2012Z 241DEG 13KT 3235 8103Special weather statement, Jun 20, 4:48 PM EDT, 0 minutes before
Special Weather Statement
National Weather Service Charleston SC
448 PM EDT WED JUN 20 2018
SCZ042-043-047-048-051-202130-
Inland Jasper-Coastal Jasper-Hampton-Beaufort-Inland Colleton-
448 PM EDT WED JUN 20 2018
...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF BEAUFORT...HAMPTON...
COLLETON AND JASPER COUNTIES...
At 448 PM EDT, National Weather Service doppler radar indicated
strong thunderstorms along a line extending from Early Branch to near
Switzerland, and moving east at 10 mph.
HAZARD...strong winds 45 to 55 mph.
IMPACT...Expect minor damage to tree limbs and blowing around of
light, unsecured objects.
Some locations in the path of these storms include...
Ridgeland, Yemassee, Grahamville, Coosawhatchie, Lemon Island, Grays,
Switzerland and Old House.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3286 8078 3236 8081 3236 8106 3284 8101
TIME...MOT...LOC 2048Z 273DEG 8KT 3275 8094 3241 8097The office that day
Everything else NWS Charleston, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 3:18 AM EDT | Heat Advisory | CHS | Allendale, Berkeley, Colleton, Dorchester, Hampton | 15 hr |
| Jun 20, 4:12 PM EDT | Special Weather Statement | CHS | Jasper | 33 min |
| Jun 20, 5:33 PM EDT | Special Weather Statement | CHS | Colleton | 42 min |
| Jun 20, 6:10 PM EDT | Special Weather Statement | CHS | Colleton, Hampton | 50 min |
| Jun 20, 6:15 PM EDT | Severe Thunderstorm Warning | CHS | Colleton, Hampton, Jasper | 60 min |
| Jun 20, 6:39 PM EDT | Special Weather Statement | CHS | Dorchester | 51 min |
| Jun 20, 7:04 PM EDT | Severe Thunderstorm Warning | CHS | Allendale, Hampton, Jasper | 56 min |
| Jun 20, 7:18 PM EDT | Special Weather Statement | CHS | Berkeley | 42 min |
| Jun 20, 7:29 PM EDT | Severe Thunderstorm Warning | CHS | Berkeley | 42 min |
| Jun 20, 3:04 PM EDT | Special Weather Statement | CHS | Chatham | 41 min |
| Jun 20, 3:12 PM EDT | Special Weather Statement | CHS | Liberty | 48 min |
| Jun 20, 3:45 PM EDT | Special Weather Statement | CHS | Chatham | 45 min |
| Jun 20, 3:54 PM EDT | Special Weather Statement | CHS | McIntosh | 51 min |
| Jun 20, 5:50 PM EDT | Special Weather Statement | CHS | Liberty | 40 min |
| Jun 20, 6:23 PM EDT | Special Weather Statement | CHS | Long | 52 min |
Nearby
Special Weather Statements in South Carolina, 2018Every special weather statement in 2018
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.