Alert archive / South Carolina / Wind Advisories in 2020

Wind Advisory 3, NWS Charleston, SC

April 12, 2020Berkeley County, Dorchester County, South Carolina

NWS Charleston, SC issued this wind advisory at Apr 12, 2020, 3:09 PM EDT for Berkeley County, Dorchester County, South Carolina. It took effect at Apr 13, 2020, 12:00 AM EDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Apr 12, 2020, 3:09 PM EDT (19:09 UTC)
In effect from
Apr 13, 2020, 12:00 AM EDT
Expired
Apr 13, 2020, 9:52 AM EDT
In force
10 hr
Issued by
NWS Charleston, SC

Counties Berkeley County, SC, Dorchester County, SC

The radar

The Charleston,SC radar (KCLX), 97 km from the middle of the area, began a volume at 19:10 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, 7.2 hours before the alert went out and 31 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-pSkew-T log-p diagram, Charleston AFB, SC at 12:00Z on 2020-04-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Charleston AFB, SC at 12:00Z on 2020-04-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 135 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
3 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
956 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
135 m²/s²
0-3 km storm-relative helicity
163 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

830 
WWUS72 KCHS 121909
NPWCHS

URGENT - WEATHER MESSAGE
National Weather Service Charleston SC
309 PM EDT Sun Apr 12 2020

SCZ045-130315-
/O.NEW.KCHS.WI.Y.0003.200413T0400Z-200413T1600Z/
/O.EXT.KCHS.LW.Y.0012.000000T0000Z-200413T0400Z/
Inland Berkeley-
Including the cities of Goose Creek and Moncks Corner
309 PM EDT Sun Apr 12 2020

...LAKE WIND ADVISORY NOW IN EFFECT UNTIL MIDNIGHT EDT TONIGHT
FOR LAKE MOULTRIE...
...WIND ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO NOON EDT
MONDAY...

* WHAT...For the Lake Wind Advisory, southeast winds 15 to 20
  knots with gusts up to 30 knots and waves 1 to 2 feet. For the
  Wind Advisory, south winds 20 to 30 mph with gusts up to 40 mph
  expected.

* WHERE...Inland Berkeley County.

* WHEN...For the Lake Wind Advisory, until midnight EDT tonight. 
  For the Wind Advisory, from midnight tonight to noon EDT 
  Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

GAZ119-SCZ044-048>052-130315-
/O.NEW.KCHS.WI.Y.0003.200413T0400Z-200413T1600Z/
Coastal Chatham-Dorchester-Beaufort-Coastal Colleton-Charleston-
Coastal Jasper-Tidal Berkeley-
Including the cities of Wilmington Island, Tybee Island, 
Saint George, Summerville, Beaufort, Hilton Head Island, 
Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy,
Chelsea, Jasper, and Daniel Island
309 PM EDT Sun Apr 12 2020

...WIND ADVISORY IN EFFECT FROM MIDNIGHT TONIGHT TO NOON EDT
MONDAY...

* WHAT...South winds 25 to 30 mph with gusts up to 40 mph 
  expected.

* WHERE...In South Carolina, Dorchester, Beaufort, Coastal 
  Colleton, Charleston, Coastal Jasper and Tidal Berkeley 
  Counties. In Georgia, Coastal Chatham County.

* WHEN...From midnight tonight to noon EDT Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
7 follow-up statements
942 
WWUS72 KCHS 122220
NPWCHS

URGENT - WEATHER MESSAGE
National Weather Service Charleston SC
620 PM EDT Sun Apr 12 2020

SCZ045-130630-
/O.CON.KCHS.LW.Y.0012.000000T0000Z-200413T0400Z/
/O.CON.KCHS.WI.Y.0003.200413T0400Z-200413T1600Z/
Inland Berkeley-
Including the cities of Goose Creek and Moncks Corner
620 PM EDT Sun Apr 12 2020

...LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT FOR LAKE MOULTRIE...
...WIND ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON
EDT MONDAY...

* WHAT...For the Lake Wind Advisory, southeast winds 15 to 20 
  knots with gusts up to 30 knots and waves 1 to 2 feet. For the 
  Wind Advisory, south winds 15 to 25 mph with gusts up to 35 
  mph expected.

* WHERE...Inland Berkeley County.

* WHEN...For the Lake Wind Advisory, until midnight EDT tonight. 
  For the Wind Advisory, from midnight tonight to noon EDT 
  Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

GAZ119-SCZ044-048>052-130630-
/O.CON.KCHS.WI.Y.0003.200413T0400Z-200413T1600Z/
Coastal Chatham-Dorchester-Beaufort-Coastal Colleton-Charleston-
Coastal Jasper-Tidal Berkeley-
Including the cities of Wilmington Island, Tybee Island, 
Saint George, Summerville, Beaufort, Hilton Head Island, 
Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy,
Chelsea, Jasper, and Daniel Island
620 PM EDT Sun Apr 12 2020

...WIND ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON
EDT MONDAY...

* WHAT...South winds 20 to 30 mph with gusts up to 40 mph
  expected. 

* WHERE...In South Carolina, Dorchester, Coastal Jasper, 
  Charleston, Tidal Berkeley, Beaufort and Coastal Colleton 
  Counties. In Georgia, Coastal Chatham County.

* WHEN...From midnight tonight to noon EDT Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

* ADDITIONAL DETAILS...Higher winds possible along beaches and
  elevated bridges and overpasses.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
541 
WWUS72 KCHS 130051
NPWCHS

URGENT - WEATHER MESSAGE
National Weather Service Charleston SC
851 PM EDT Sun Apr 12 2020

SCZ045-130900-
/O.CON.KCHS.LW.Y.0012.000000T0000Z-200413T0400Z/
/O.CON.KCHS.WI.Y.0003.200413T0400Z-200413T1600Z/
Inland Berkeley-
Including the cities of Goose Creek and Moncks Corner
851 PM EDT Sun Apr 12 2020

...LAKE WIND ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT EDT
TONIGHT FOR LAKE MOULTRIE...
...WIND ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON
EDT MONDAY...

* WHAT...For the Lake Wind Advisory, southeast winds 15 to 20 
  knots with gusts up to 30 knots and waves 1 to 2 feet. For the 
  Wind Advisory, south winds 15 to 25 mph with gusts up to 40 
  mph expected.

* WHERE...Inland Berkeley County.

* WHEN...For the Lake Wind Advisory, until midnight EDT tonight. 
  For the Wind Advisory, from midnight tonight to noon EDT 
  Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

GAZ119-SCZ044-048>052-130900-
/O.CON.KCHS.WI.Y.0003.200413T0400Z-200413T1600Z/
Coastal Chatham-Dorchester-Beaufort-Coastal Colleton-Charleston-
Coastal Jasper-Tidal Berkeley-
Including the cities of Wilmington Island, Tybee Island, 
Saint George, Summerville, Beaufort, Hilton Head Island, 
Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy,
Chelsea, Jasper, and Daniel Island
851 PM EDT Sun Apr 12 2020

...WIND ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON
EDT MONDAY...

* WHAT...South winds 20 to 30 mph with gusts up to 45 mph 
  expected.

* WHERE...In South Carolina, Dorchester, Coastal Jasper, 
  Charleston, Tidal Berkeley, Beaufort and Coastal Colleton 
  Counties. In Georgia, Coastal Chatham County.

* WHEN...From midnight tonight to noon EDT Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

* ADDITIONAL DETAILS...Higher winds possible along beaches and 
  elevated bridges and overpasses.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
166 
WWUS72 KCHS 130401
NPWCHS

URGENT - WEATHER MESSAGE
National Weather Service Charleston SC
1201 AM EDT Mon Apr 13 2020

SCZ045-131215-
/O.EXP.KCHS.LW.Y.0012.000000T0000Z-200413T0400Z/
/O.CON.KCHS.WI.Y.0003.000000T0000Z-200413T1600Z/
Inland Berkeley-
Including the cities of Goose Creek and Moncks Corner
1201 AM EDT Mon Apr 13 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL NOON EDT MONDAY...
...LAKE WIND ADVISORY WILL EXPIRE AT MIDNIGHT EDT TONIGHT FOR
LAKE MOULTRIE...

* WHAT...South winds 15 to 25 mph with gusts up to 40 mph 
  expected.

* WHERE...Inland Berkeley County.

* WHEN...Through noon EDT Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

GAZ119-SCZ044-048>052-131215-
/O.CON.KCHS.WI.Y.0003.000000T0000Z-200413T1600Z/
Coastal Chatham-Dorchester-Beaufort-Coastal Colleton-Charleston-
Coastal Jasper-Tidal Berkeley-
Including the cities of Wilmington Island, Tybee Island, 
Saint George, Summerville, Beaufort, Hilton Head Island, 
Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy,
Chelsea, Jasper, and Daniel Island
1201 AM EDT Mon Apr 13 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL NOON EDT MONDAY...

* WHAT...South winds 20 to 30 mph with gusts up to 45 mph 
  expected.

* WHERE...In South Carolina, Dorchester, Coastal Jasper, 
  Charleston, Tidal Berkeley, Beaufort and Coastal Colleton 
  Counties. In Georgia, Coastal Chatham County.

* WHEN...Through noon EDT Monday.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
442 
WWUS72 KCHS 130554
NPWCHS

URGENT - WEATHER MESSAGE
National Weather Service Charleston SC
154 AM EDT Mon Apr 13 2020

GAZ118-131400-
/O.EXA.KCHS.WI.Y.0003.000000T0000Z-200413T1600Z/
Inland Chatham-
Including the cities of Garden City, Pooler, and Savannah
154 AM EDT Mon Apr 13 2020

...WIND ADVISORY IN EFFECT UNTIL NOON EDT TODAY...

* WHAT...South winds 20 to 30 mph with gusts up to 45 mph.

* WHERE...Inland Chatham County.

* WHEN...Until noon EDT today.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree
  limbs could be blown down and a few power outages may result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

GAZ119-SCZ044-045-048>052-131400-
/O.CON.KCHS.WI.Y.0003.000000T0000Z-200413T1600Z/
Coastal Chatham-Dorchester-Inland Berkeley-Beaufort-
Coastal Colleton-Charleston-Coastal Jasper-Tidal Berkeley-
Including the cities of Wilmington Island, Tybee Island, 
Saint George, Summerville, Goose Creek, Moncks Corner, Beaufort, 
Hilton Head Island, Edisto Beach, Charleston, North Charleston, 
Mount Pleasant, Levy, Chelsea, Jasper, and Daniel Island
154 AM EDT Mon Apr 13 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL NOON EDT TODAY...

* WHAT...South winds 20 to 30 mph with gusts up to 45 mph.

* WHERE...In South Carolina, Dorchester, Inland Berkeley, 
  Coastal Jasper, Charleston, Tidal Berkeley, Beaufort and 
  Coastal Colleton Counties. In Georgia, Coastal Chatham County.

* WHEN...Until noon EDT today.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
373 
WWUS72 KCHS 130743
NPWCHS

URGENT - WEATHER MESSAGE
National Weather Service Charleston SC
343 AM EDT Mon Apr 13 2020

GAZ118-119-SCZ044-045-048>052-131545-
/O.CON.KCHS.WI.Y.0003.000000T0000Z-200413T1600Z/
Inland Chatham-Coastal Chatham-Dorchester-Inland Berkeley-
Beaufort-Coastal Colleton-Charleston-Coastal Jasper-
Tidal Berkeley-
Including the cities of Garden City, Pooler, Savannah, 
Wilmington Island, Tybee Island, Saint George, Summerville, 
Goose Creek, Moncks Corner, Beaufort, Hilton Head Island, 
Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy,
Chelsea, Jasper, and Daniel Island
343 AM EDT Mon Apr 13 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL NOON EDT TODAY...

* WHAT...South winds 20 to 30 mph with gusts up to 45 mph.

* WHERE...Portions of southeast South Carolina and southeast 
  Georgia.

* WHEN...Until noon EDT today.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
615 
WWUS72 KCHS 131208
NPWCHS

URGENT - WEATHER MESSAGE
National Weather Service Charleston SC
808 AM EDT Mon Apr 13 2020

GAZ118-119-SCZ044-045-048>052-131600-
/O.CON.KCHS.WI.Y.0003.000000T0000Z-200413T1600Z/
Inland Chatham-Coastal Chatham-Dorchester-Inland Berkeley-
Beaufort-Coastal Colleton-Charleston-Coastal Jasper-
Tidal Berkeley-
Including the cities of Garden City, Pooler, Savannah, 
Wilmington Island, Tybee Island, Saint George, Summerville, 
Goose Creek, Moncks Corner, Beaufort, Hilton Head Island, 
Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy,
Chelsea, Jasper, and Daniel Island
808 AM EDT Mon Apr 13 2020

...WIND ADVISORY REMAINS IN EFFECT UNTIL NOON EDT TODAY...

* WHAT...South winds 15 to 25 mph with gusts up to 40 mph.

* WHERE...Portions of southeast South Carolina and southeast 
  Georgia.

* WHEN...Until noon EDT today.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$
686 
WWUS72 KCHS 131352
NPWCHS

URGENT - WEATHER MESSAGE
National Weather Service Charleston SC
952 AM EDT Mon Apr 13 2020

GAZ118-119-SCZ044-045-048>052-131500-
/O.CAN.KCHS.WI.Y.0003.000000T0000Z-200413T1600Z/
Inland Chatham-Coastal Chatham-Dorchester-Inland Berkeley-
Beaufort-Coastal Colleton-Charleston-Coastal Jasper-
Tidal Berkeley-
Including the cities of Garden City, Pooler, Savannah, 
Wilmington Island, Tybee Island, Saint George, Summerville, 
Goose Creek, Moncks Corner, Beaufort, Hilton Head Island, 
Edisto Beach, Charleston, North Charleston, Mount Pleasant, Levy,
Chelsea, Jasper, and Daniel Island
952 AM EDT Mon Apr 13 2020

...WIND ADVISORY IS CANCELLED...

$$

What forecasters said that day

The local office's own words before this wind advisory 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 wind advisory went out at Apr 12, 1:50 PM EDT, 1 hour 19 minutes earlier.

Area forecast discussion, Apr 12, 1:50 PM EDT, 1 hour 19 minutes before
Area Forecast Discussion
National Weather Service Charleston SC
150 PM EDT Sun Apr 12 2020

.SYNOPSIS...
A warm front will lift north today, then a cold front will move
through Monday. High pressure will briefly rebuild early next
week before a coastal low pressure system moves through mid
week. High pressure will return Thursday and Friday.

&&

.NEAR TERM /THROUGH TONIGHT/...
A low pressure system will advance towards the area from the
west today. An associated warm front currently to our south
will slowly lift towards the area through the day. Showers and
thunderstorms have blossomed over the southern half of the
forecast area. This activity will shift north through the area
through the rest of the afternoon. An isolated severe
thunderstorm/tornado cannot be ruled out with increasing shear
and impressive low level helicity values, however the
instability will remain the limiting factor. Most favorable
conditions will exist across southeast Georgia and inland areas.
Overall threat appears low, but radar will certainly bear
watching.

Otherwise, southeast winds will increase throughout the day as
the pressure gradient tightens. Conditions are expected to
remain below Wind Advisory criteria, although could come close
along the coast late in the day. Temperatures will peak well
into the 70s across most locations, with locations across the
far south to reach the low 80s. Ongoing forecast was working out
well, so only minor tweaks were made to account for latest
observations and trends.

Tonight: Most of the shower activity within the northward
lifting surface trough will quickly dwindle this evening. In
fact, much of the evening and early morning hours are expected
to largely be precipitation free ahead of the approaching
intense line of thunderstorms to the west. The main forecast
challenge will be timing the arrival of the thunderstorm line,
and assessing the near storm environment that it will be
sampling when it does arrive. For the last several days, models
have steadily slowed the arrival of the line and that trend has
continued. The fly in the ointment though is that typically
forecast models are too slow in moving convective lines eastward
as they become organized. In this case, a slower arrival time
seems more plausible due to the fact that the trough aloft is
expected to dampen and lift quickly northeastward just to the
west of the Southern Appalachians. Lacking the presence of the
trough aloft to push it eastward, it make sense that the
thunderstorm line won't arrive until very late tonight. Hi-res
models show the line reaching the far inland counties (Jenkins,
Candler, etc.) roughly in the 6-8 am time period. The shear and
overall dynamic fields will be quite impressive across the area.
The question will, as always, be regarding the amount of
instability available. Fortunately, this time period is as least
climatologically favorable as you can get and model soundings
show a weakly unstable environment. So as the line approaches
and reaches the far inland zones, it will likely have a history
of producing severe weather and this threat will continue into
this small area of the interior of the forecast area. The bulk
of the severe weather threat will reside in the time period
after sunrise.

In the warm sector ahead of the approaching line winds will
continue to increase overnight. Frequent gusts into the 30-35
mph range are expected, and there is certainly potential for
gusts to 40 mph. A Wind Advisory could eventually be needed for
at least portions of the area overnight.

Lake Winds: Winds will increase across Lake Moultrie and on the
lake shore areas today with frequent gusts to around 25 knots.
Winds will then increase further overnight, with gusts to around
30 knots. A Lake Wind Advisory is in effect starting this
afternoon and continuing through the overnight.

&&

.SHORT TERM /MONDAY THROUGH WEDNESDAY/...
The models are coming into better agreement that the main
area of convection associated with the cold front will move
through the local area sometime between daybreak and noon
Monday. However, it remains possible that the activity will
become quite organized upstream and accelerate east, reaching
the area before daybreak Monday.

Shear parameters are expected to be rather strong with 50-60 kt
of 0-6 km bulk shear and 0-3 km helicities of 400-500 m2/s2. As
is often the case in our area, the big question mark is whether
enough surface-based instability will exist to support a
significant threat for severe weather. Typically an early to
mid morning time frame is climatologically unfavorable for
severe weather. In this case, however, there are indications
that there could be at least moderate instability. Surface
dewpoints will be hovering around 70F Monday morning and mid-
levels will be cooling as indicated by 700-500 mb lapse rates of
6-6.5 and LIs of -3 to -5C. Several models show at least 1,000
J/kg CAPE by mid morning. Given the expected shear parameters,
damaging winds and tornadoes appear to be the main threats,
though the cooling mid levels could also support marginally
severe hail.

Breezy conditions expected through Monday afternoon though
speeds should be gradually decreasing through the day. A Lake
Wind Advisory will be in effect for Lake Moultrie through late
afternoon. We cannot rule out needing a general Wind Advisory
for coastal SC Monday morning. The brunt of the precipitation
should be moving off the coast by sometime Monday afternoon.
There really won't be a significant wind shift following the
passage of the convective line so a warm advection regime will
continue, pushing high temps into the low 80s.

Broad high pressure will expand east from the central United
States Monday night and Tuesday. A weak baroclinic zone will
develop just off the coast on Tuesday. Continuing broad upper
troughing to our west will support the development of several
weak waves of low pressure along the coastal baroclinic zone
Tuesday through Wednesday. Fairly widespread showers and
isolated thunderstorms are expected to move through Tuesday
night and Wednesday as the main surface low moves through.
Wednesday will bring cooler temperatures as cold air advection
occurs on the western periphery of the surface low.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
Several areas of high pressure will traverse the area Wednesday
night through the weekend. There could be a few showers during
the weekend as some upper shortwaves move through.

&&

.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
Isolated showers have reached KSAV and will continue to push
northeast quickly over the next couple of hours, towards KCHS.
Impacts will be minimal at both terminals. Cloud cover has been
increasing at KCHS, and MVFR is expected soon and then will
prevail. MVFR will prevail at KSAV as well. Winds will continue
to be southeast and gusty (25-30 kts) throughout the rest of the
day and into tomorrow.

As for tomorrow morning, a line of strong thunderstorms is expected
to move through the CWA. Time of arrival is still uncertain but as
of now, the models have it moving through from 11Z-16Z. Once the
line reaches the terminals, it should move out fairly quickly. With
this line, winds are expected to be stronger at times. MVFR will
prevail but IFR and LIFR are possible at times with thunderstorms.

Extended Aviation Outlook: Periodic flight restrictions into
midday Monday as numerous showers and tstms affect the area.
Gusty winds also expected on Monday. Flight restrictions again
possible Tuesday night and Wednesday with numerous showers
associated with a coastal low.

&&

.MARINE...
Today through Tonight: Conditions across the local waters will
steadily deteriorate this afternoon and especially overnight. A
tightening pressure gradient and strengthening low level wind
field will produce Small Craft Advisory conditions today with
solid Gale Warning conditions overnight. Frequent gusts to 35
knots are expected, even up to 40 knots across the outer Georgia
waters. A Gale Watch for Charleston Harbor is in effect starting
this evening, although it looks increasingly likely that 35
knot gusts will occur in Charleston Harbor, and the watch may
need to be upgraded to a warning later today. Seas will ramp up
quickly this afternoon and evening, and the forecast features up
to 10 feet around 20 nm and up to 12 feet in the outer waters.

Gale conditions likely Monday morning though conditions improve
fairly quickly by Monday afternoon as the low level jet shifts
east. A squall line will move through the waters during the
morning and possibly early afternoon bringing a risk for wind
gusts in excess of 50 kt, hail and possibly a waterspout or two.
Small Craft Advisory conditions likely through much of Monday
night.

Marginal Small Craft Advisories possible Wednesday night and
Thursday over the offshore waters due to northeast fetch
building some 6 ft seas.

Rip Currents: Increasing winds and waves in the surf zone will
support a moderate risk at all beaches today. The risk remains
moderate for the GA coast Monday but increases to the high
category for the SC beaches due to larger breakers.

&&

.TIDES/COASTAL FLOODING...
Higher than normal tides will continue due to astronomical
influences from the full moon and perigee. Additionally, winds
are forecast to be onshore into Monday morning, which could
further elevate the tides. As a result, minor coastal flooding
is expected around the high tide just after midnight in the early
morning hours of Monday.

High Surf: Strong southerly flow ahead of a cold front will
result in building nearshore seas this afternoon and evening. With
seas as high as 9-11 ft within 20 NM of shore, breaker heights
could exceed 5 ft at times this evening into Monday morning,
necessitating a High Surf Advisory. The risk for 5+ ft breakers
looks highest along the southern South Carolina coast, but could
also occur along the southeast Georgia coast as well.

&&

.CHS WATCHES/WARNINGS/ADVISORIES...
GA...None.
SC...Lake Wind Advisory until 5 PM EDT Monday for SCZ045.
MARINE...Small Craft Advisory until 11 PM EDT this evening for AMZ330-
     350-352-354.
     Gale Warning from 11 PM this evening to 11 AM EDT Monday for
     AMZ352-354.
     Gale Warning from 11 PM this evening to 2 PM EDT Monday for
     AMZ350.
     Small Craft Advisory until 8 PM EDT this evening for AMZ374.
     Gale Warning from 8 PM this evening to 2 PM EDT Monday for
     AMZ374.
     Gale Watch from 11 PM EDT this evening through Monday morning
     for AMZ330.

&&

NEAR TERM...ETM
SHORT TERM...JRL
LONG TERM...JRL
AVIATION...JRL/RAD
MARINE...ETM/JRL
TIDES/COASTAL FLOODING...
Hazardous weather outlook, Apr 12, 4:17 AM EDT, 10 hours 52 minutes before
Hazardous Weather Outlook...CORRECTED
National Weather Service Charleston SC
417 AM EDT Sun Apr 12 2020

SCZ048>051-130815-
Beaufort-Coastal Colleton-Charleston-Coastal Jasper-
417 AM EDT Sun Apr 12 2020

...MODERATE RISK FOR RIP CURRENTS IN EFFECT FROM 8 AM EDT THIS
MORNING THROUGH THIS EVENING...

This Hazardous Weather Outlook is for 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.

   Moderate Risk for Rip Currents.

Coastal Flooding: Minor coastal flooding is possible with the high
tide late this evening.

Strong Winds: Gusty south winds are expected tonight. A Wind
Advisory is possible.

High Surf: Breaking waves of 5 feet are possible along the South
Carolina coast late tonight. A High Surf Advisory is possible.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Severe Thunderstorms: There is a threat of severe thunderstorms
Monday between daybreak and early afternoon as a cold front moves
through. Damaging winds, isolated tornadoes and marginally severe
hail will be the primary threats. Considerable uncertainty exists
regarding the timing of the front.

Rip Currents: There is a high risk for rip currents along the South
Carolina beaches Monday.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

GAZ087-088-099>101-114>116-118-137-138-140-SCZ040-042>044-047-052-
130815-
Jenkins-Screven-Candler-Bulloch-Effingham-Tattnall-Evans-
Inland Bryan-Inland Chatham-Long-Inland Liberty-Inland McIntosh-
Allendale-Hampton-Inland Colleton-Dorchester-Inland Jasper-
Tidal Berkeley-
417 AM EDT Sun Apr 12 2020

This Hazardous Weather Outlook is for southeast Georgia and
southeast South Carolina.

.DAY ONE...Today and tonight.

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Severe Thunderstorms: There is a threat of severe thunderstorms
Monday between daybreak and early afternoon as a cold front moves
through. Damaging winds, isolated tornadoes and marginally severe
hail will be the primary threats. Considerable uncertainty exists
regarding the timing of the front.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

SCZ045-130815-
Inland Berkeley-
417 AM EDT Sun Apr 12 2020

...LAKE WIND ADVISORY IN EFFECT FROM 2 PM THIS AFTERNOON TO 5 PM EDT
MONDAY FOR LAKE MOULTRIE...

This Hazardous Weather Outlook is for 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.

   Lake Wind Advisory.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Lake Wind Advisory.

Severe Thunderstorms: There is a threat of severe thunderstorms
Monday between daybreak and early afternoon as a cold front moves
through. Damaging winds, isolated tornadoes and marginally severe
hail will be the primary threats. Considerable uncertainty exists
regarding the timing of the front.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

GAZ117-119-139-141-130815-
Coastal Bryan-Coastal Chatham-Coastal Liberty-Coastal McIntosh-
417 AM EDT Sun Apr 12 2020

...MODERATE RISK FOR RIP CURRENTS IN EFFECT FROM 8 AM EDT THIS
MORNING THROUGH THIS EVENING...

This Hazardous Weather Outlook is for southeast Georgia.

.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.

   Moderate Risk for Rip Currents.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Severe Thunderstorms: There is a threat of severe thunderstorms
Monday between daybreak and early afternoon as a cold front moves
through. Damaging winds, isolated tornadoes and marginally severe
hail will be the primary threats. Considerable uncertainty exists
regarding the timing of the front.

Rip Currents: There is a moderate risk for rip currents Monday.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

AMZ350-130815-
Waters from South Santee River to Edisto Beach SC out 20 NM-
417 AM EDT Sun Apr 12 2020

...GALE WARNING IN EFFECT FROM 11 PM THIS EVENING TO 2 PM EDT
MONDAY...

This Hazardous Weather Outlook is for Atlantic coastal waters.

.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.

   Gale Warning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

Severe Thunderstorms: There is a threat of severe thunderstorms
Monday between daybreak and early afternoon as a cold front moves
through. Damaging winds, isolated waterspouts and marginally severe
hail will be the primary threats. Considerable uncertainty exists
regarding the timing of the front.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

AMZ330-130815-
Charleston Harbor-
417 AM EDT Sun Apr 12 2020

...GALE WATCH IN EFFECT FROM THIS EVENING THROUGH MONDAY MORNING...

This Hazardous Weather Outlook is for Atlantic coastal waters.

.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.

   Gale Watch.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Watch.

Severe Thunderstorms: There is a threat of severe thunderstorms
Monday between daybreak and early afternoon as a cold front moves
through. Damaging winds, isolated waterspouts and marginally severe
hail will be the primary threats. Considerable uncertainty exists
regarding the timing of the front.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

AMZ352-354-130815-
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-
417 AM EDT Sun Apr 12 2020

...GALE WARNING IN EFFECT FROM 11 PM THIS EVENING TO 11 AM EDT
MONDAY...

This Hazardous Weather Outlook is for Atlantic coastal waters.

.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.

   Gale Warning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

Severe Thunderstorms: There is a threat of severe thunderstorms
Monday between daybreak and early afternoon as a cold front moves
through. Damaging winds, isolated waterspouts and marginally severe
hail will be the primary threats. Considerable uncertainty exists
regarding the timing of the front.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

AMZ374-130815-
Waters from Savannah GA to Altamaha Sound GA from 20 to 60 NM-
417 AM EDT Sun Apr 12 2020

...GALE WARNING IN EFFECT FROM 8 PM THIS EVENING TO 2 PM EDT
MONDAY...

This Hazardous Weather Outlook is for Atlantic coastal waters.

.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.

   Gale Warning.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

Severe Thunderstorms: There is a threat of severe thunderstorms
Monday between daybreak and early afternoon as a cold front moves
through. Damaging winds, isolated waterspouts and marginally severe
hail will be the primary threats. Considerable uncertainty exists
regarding the timing of the front.

.SPOTTER INFORMATION STATEMENT...

Spotter assistance is not anticipated at this time.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 12, 3:36 AM EDTGale WatchCHS12 hr
Apr 12, 3:36 AM EDTGale WarningCHS34 hr
Apr 12, 3:40 AM EDTLake Wind AdvisoryCHSBerkeley20 hr
Apr 12, 3:07 PM EDTRip Current StatementCHS28 hr
Apr 12, 3:07 PM EDTHigh Surf AdvisoryCHS19 hr

Nearby

Wind Advisories in South Carolina, 2020Wind Advisories in Georgia, 2020Every wind advisory in 2020

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.