Saturday, December14, 2019
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Marine Weather and Tides
Isle of Palms, 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

Sunrise 7:12AMSunset 5:15PM Saturday December 14, 2019 8:44 AM EST (13:44 UTC) Moonrise 7:44PMMoonset 9:13AM Illumination 92% Phase: Waning Gibbous; Moon at 18 days in cycle
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.
Marine Forecasts
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7 Day Forecast for Marine Location Near Isle of Palms, SC
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location: 30.97, -77.7     debug


Area Discussion for - Charleston, SC
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FXUS62 KCHS 141218 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 718 AM EST Sat Dec 14 2019

SYNOPSIS. High pressure will build from the west through the weekend and then slide offshore on Monday. A cold front will then cross the area Tuesday, followed by high pressure into late next week. Low pressure should then develop along the coast next weekend.

NEAR TERM /THROUGH TONIGHT/. Today: A strong mid level short wave is forecast to rapidly move northeast into the Mid Atlantic region later this morning as the negatively tilted base of the upper trough slides across the Carolinas this afternoon. West flow and strong deep layered drying is on tap for the region today as rains end by mid morning at the latest across SC zones. As afternoon sunshine returns, increasing low level mixed layers will allow for occasionally breezy conditions at times given 25-30 kt of flow in the boundary layer and temps likely to warm into the lower 60s many areas.

Lake Winds: Since the Lake Moultrie water temps were in the lower 50s, we think gusty west winds will be stronger on western and southern lake shores later this morning into this afternoon. Brief advisory conditions are possible, we capped speeds at 15-20 kt today and waves 1-2 ft.

Tonight: High pressure will slowly build from the west and surface winds are expected to gradually decouple overnight. A few of our normally cooler inland spots could dip into the mid 30s late, many areas will dip to around 40 degrees near daybreak on Sunday.

SHORT TERM /SUNDAY THROUGH TUESDAY/. Sunday and Monday: High pressure will slowly build across the area early in the week, eventually becoming centered off the Southeast Coast by early Monday. The changing pattern will favor a warming trend as west winds turn south well ahead of a developing low pressure system tracking across the Central United States. In general, high temps will peak in the mid/upper 60s on Sunday, then mid 70s under gradual mid-lvl ridging and mostly sunny skies on Monday. Overnight lows should range in the mid/upper 40s away from the coast Sunday night, followed by much milder temps in the upper 50s/lower 60s Monday night.

Tuesday: The area will be warm-sectored for much of the day ahead of a cold front expected to sweep through the Southeast United States during the afternoon into evening hours. Despite widespread clouds, temps should approach the mid 70s across most areas before the onset of precip closer to the arriving front. Latest guidance suggests sfc instability to remain rather weak during the period, but sufficient for a few thunderstorms embedded within numerous to widespread showers spreading west to east across the area during the afternoon. Expect the bulk of precip activity to shift offshore during evening hours, especially as winds turn more west post fropa and high pressure builds across inland areas late.

LONG TERM /TUESDAY NIGHT THROUGH FRIDAY/. Dry and cooler high pressure will spread across the region Tuesday night through Thursday with high/low temps some 15-20 degrees cooler than earlier in the week. In general, high temps will peak in the mid 50s Wednesday and Thursday while overnight lows dip into the low/mid 30s away from the coast Wednesday night and Thursday night. Guidance then suggests the potential for precip to return across the area next weekend, mainly due to a coastal trough/low developing just off the Southeast Coast. Precip chances should be highest near the land/sea interface Saturday. Temps will be slightly more mild during the weekend as well, peaking in the upper 50s/lower 60s each day. Overnight lows should range in the upper 30s/lower 40s away from the coast.

AVIATION /12Z SATURDAY THROUGH WEDNESDAY/. Rains were quickly ending along the coastal corridor around dawn. Drier air is shifting in atop the moist lower layers and it may take a good portion of the late morning to scour IFR/MVFR cigs, with the slight later clearing at KCHS. The afternoon hours expected to see only scattered clouds at best and VFR conditions. Gusty west winds will develop late morning and persist until shortly before dusk, expect west winds in the 15 kt ranges with gusts topping 20 kt during the warmest part of the afternoon.

Extended Aviation Outlook: VFR conditions will prevail Sunday and 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.

MARINE. Overnight, low stratus and fog plagued the land/sea interface with vsby restrictions. We have just recently seen improvements around the Charleston waters as rains and enhanced low level winds have resulted in improving conditions with respect to the fog. A cold front will be shifting offshore early on and the risk for additional fog has ended. High pressure building from the west along with a tight low-level pressure gradient across the waters. There will be a favorable mixing environment further offshore where warmest Atlantic waters are, still gusty over near shore waters with speeds mainly in the 15-20 kt range. We have SCAs today for SC and 20-60 NM GA waters as well as the Charleston Harbor. Winds will remain offshore and tend to diminish tonight as high pressure draws closer.

Sunday through Thursday: Winds/seas will decrease/subside to levels well below Small Craft Advisory criteria Sunday and Monday as high pressure builds across the region, then becomes centered off the Southeast Coast. West winds will turn south heading into Tuesday before a cold front shifts across coastal waters late afternoon into the evening. Southerly flow could also favor some sea fog on Tuesday as low/mid 60 dewpts spread across all coastal waters within the warm sector ahead of the front. Strong 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 Thursday, 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 . Small Craft Advisory until 6 PM EST this evening for AMZ330. Small Craft Advisory until 9 PM EST this evening for AMZ352. Small Craft Advisory until midnight EST tonight for AMZ350. Small Craft Advisory until 5 AM EST Sunday for AMZ374.

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


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC171 mi49 minW 77.00 miMostly Cloudy52°F51°F100%1003 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW4
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1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmNE5
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2 days agoN9
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Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (8,2,3,4)
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Ground Weather Radar Station Wilmington, NC
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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.