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Marine Weather and Tides Mount Pleasant, SC Version 3.4

NOTICE 10/9/2019 Updated the Marine Zones. 9/4/2019 Fixed the weather maps due to NOAA moving them. 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

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Sunrise 7:12AM

Sunset 5:16PM

Sunday December 15, 2019 8:18 AM EST (13:18 UTC)

Moonrise 8:53PM

Moonset 10:19AM

Illumination 85%

NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

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7 Day Forecast for Marine Location Near Mount Pleasant, SC

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Area Discussion for - Charleston, SC

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FXUS62 KCHS 151233 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 733 AM EST Sun Dec 15 2019

SYNOPSIS. High pressure across the region today will slide offshore through Monday. A cold front will then cross the area late Tuesday, followed by high pressure into late next week. Low pressure should develop near the coast next weekend.

NEAR TERM /THROUGH TONIGHT/. Today: Mid and upper flow becomes zonal while deep layered dry air was poised to result in sunshine with just a few mid level clouds occasionally passing through. Temps are expected to moderate with light offshore flow, becoming southwest later in the day. Temps expected to warm into the lower and mid 60s this afternoon.

Tonight: Surface high pressure will continue to move offshore and weak return flow and decent warm air advection is noted atop the surface based inversion overnight. The main question will be the amount of stratus and fog that develops and advects northward in this regime. We have patchy fog in the forecast for now inland from the beaches and barrier islands. Lows will mainly be in the lower to mid 40s inland and mid/upper 40s closer in the coast.

SHORT TERM /MONDAY THROUGH WEDNESDAY/. Monday: The area will be positioned between high pressure centered offshore and a developing low pressure system tracking across the Central United States. That pattern will result in a southerly flow to the region, favoring warm temps during the day and moistening conditions overnight. In general, high temps will peak in the mid 70s away from the beaches. A few upper 70s are possible across Southeast Georgia. Temps will remain mild overnight as the area becomes warm-sectored well ahead of a cold front advancing towards the Southeast United States. Weak isentropic lift and moisture return could spawn a few showers across inland areas after midnight, but the bulk of precip should hold off until daybreak Tuesday.

Tuesday: The area will be warm-sectored for much of the day ahead of a cold front that is expected to push through the area during the afternoon into evening hours. Despite widespread clouds, temps should peak in the mid 70s across most areas before the onset of precip closer to the arriving front. Precip chances should ramp up fairly quick during late morning hours as PWATs approach 1.5 inches. Guidance supports SBCAPE between 500-800 J/kg, sufficient for a few thunderstorms embedded within numerous to widespread showers spreading west to east during the afternoon. Gusty winds are possible with convection given 40-50 kt low-lvl wind fields passing across the area. Expect the bulk of precip activity to shift offshore during evening hours, especially as winds turn west/northwest post fropa and high pressure builds across inland areas late. However, some showers could linger near the coast until at least midnight.

Wednesday: Dry and cooler high pressure will spread across the region with temps some 15-20 degrees cooler than the previous day. Despite a full day of sun, northerly winds will maintain high temps only in the low/mid 50s.

LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/. Dry and cool high pressure will persist across the Southeast United States through late week. Light north/northeast winds will keep high temps in the mid 50s Thursday while overnight lows dip into the low/mid 30s away from the coast Wednesday night and Thursday night. Temps will slowly warm into the upper 50s/lower 60s Friday as low pressure develops off the Southeast Coast. Guidance suggests the potential for precip to return across the area during the weekend, mainly as the low deepens and tracks north/northeast offshore Saturday into Sunday. Precip chances should be highest near the land/sea interface Saturday. Temps should also peak in the upper 50s/lower 60s each day. Overnight lows should range in the mid/upper 30s inland to low/mid 40s near the coast.

AVIATION /13Z SUNDAY THROUGH THURSDAY/. VFR at KCHS and KSAV through 06Z Monday. Shallow moisture and strong surface radiational cooling may result in a potential for late night restrictions along the coastal corridor. At this time, we have only mentions at KSAV. Later cycles may need to hit the fog a bit harder around daybreak on Monday.

Extended Aviation Outlook: VFR conditions will prevail Monday at both CHS and SAV terminals. Flight restrictions are possible at both terminals Tuesday due to showers/thunderstorms along a passing cold front. VFR conditions should then prevail at both terminals Wednesday and persist into Thursday.

MARINE. Surface high pressure building over the local waters later this morning and gradually moving offshore early this evening through tonight. Winds and seas have been steadily decreasing this morning and were generally less than 15 kt beyond 20 NM. Wind directions will become light and variable for a while during high pressure's transition offshore today. Seas will be 1 to 2 ft near shore and 2-3 ft offshore. Light winds tonight will become southeast to south late with seas mostly 2-3 ft, highest offshore.

Monday through Friday: High pressure will dominate the coastal waters early this week, favoring winds/seas that remain well below Small Craft Advisory levels. Southerly sfc winds will then prevail heading into Tuesday before a cold front shifts across coastal waters late afternoon into the evening. Some sea fog could develop across nearshore waters late Monday night into Tuesday as lower 60 dewpts spread across the coastal waters, but conditions will become less favorable as the pressure gradient tightens and low-lvl winds become stronger before fropa later Tuesday. Cold air advection in wake of the front should then produce a period of Small Craft Advisory level conditions across a portion of the coastal waters Tuesday night into Wednesday. High pressure will then build across the area from the north through Friday, favoring north/northeast winds around 15-20 kts as the pressure gradient remains somewhat enhanced along the coast. Seas of 6 ft could also persist across offshore Georgia waters during this time, resulting in a Small Craft Advisory late Wednesday into Thursday.

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

NEAR TERM . SHORT TERM . LONG TERM . DPB AVIATION . DPB MARINE .

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
CHTS1	11 mi	48 min	W 4.1 G 6	47°F	56°F		1019.4 hPa
FBIS1 - Folly Island, SC	17 mi	78 min	WNW 1.9 G 2.9	44°F			1019.2 hPa (+2.1)	44°F
ACXS1 - ACE Basin Reserve, SC	42 mi	93 min	Calm	41°F			1019 hPa	41°F
NIWS1 - North Inlet-Winyah Bay Reserve, SC	45 mi	93 min	Calm	40°F			1017 hPa	40°F
41004 - EDISTO - 41 NM Southeast of Charleston, SC	49 mi	28 min	7.8 G 12		71°F	4 ft	1019.1 hPa

Wind History for Charleston, SC

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9 AM

10 AM

11 AM

-12 PM

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7 PM

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Last 24hr

NW7 G10

N9 G15

NW6 G11

W5 G8

W7 G12

W6 G11

W7 G11

W8

W7 G10

W6 G10

W5 G8

W4 G7

W4 G7

W4

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W2

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1 day ago

NW11 G14

NW10

N8

NW4 G7

NW5 G8

N8 G12

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N4 G7

N3

N5

N3

NW2

NW3 G9

W4

NW2

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SW3

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W9 G15

W1 G4

NW6 G10

S3

NW8 G11

2 days ago

N16 G20

N13

N11 G15

N13 G17

N13 G17

N14 G17

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NE15

NE14 G19

N11 G17

NE15 G19

NE13 G18

NE15

N12 G17

N11 G16

N12 G15

N10 G14

N11 G14

N8 G13

N8 G12

N10 G14

N8 G11

N10

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Mount Pleasant Regional-Faison Field, SC	3 mi	23 min	N 0	9.00 mi	Fair	39°F	39°F	100%	1019.3 hPa
Charleston, Charleston Air Force Base, SC	11 mi	82 min	N 0	9.00 mi	Fair	40°F	39°F	97%	1018.5 hPa
Charleston Executive Airport, SC	18 mi	23 min	N 0	7.00 mi	Fair	45°F	42°F	93%	1019.6 hPa
Moncks Corner Berkeley County, SC	21 mi	23 min	N 0	5.00 mi	Fog/Mist	36°F	35°F	100%	1019.6 hPa

Link to 5 minute data for KLRO

Wind History from LRO (wind in knots)

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Last 24hr

W8

W7

W8

W8 G14

W12 G19

W14

W11

W12 G20

W8 G18

W6

W5

W5

W5 G13

W7

W7

W5 G12

W6

W4

W4

Calm

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Calm

1 day ago

5

N3

NW5

Calm

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4

N4

Calm

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NW3

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W5

NW4

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2 days ago

6 G12

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5 G10

N8 G15

6 G13

3 G13

5 G12

N7 G13

4 G12

5

6 G11

3 G10

6 G13

6 G14

5 G11

6 G12

5 G10

6

Calm

Calm

Calm

3

5

4

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Tide / Current Tables for Cainhoy, Wando River, South Carolina

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Tide / Current Tables for Charleston Harbor Entrance, South Carolina Current

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Weather Map

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GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

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Wind Forecast for Charleston, SC (8,2,3,4)

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Ground Weather Radar Station Charleston, SC

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