Sunday, January19, 2020
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Marine Weather and Tides
Isle of Palms, SC

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 7:19AMSunset 5:40PM Sunday January 19, 2020 10:58 AM EST (15:58 UTC) Moonrise 2:13AMMoonset 1:20PM Illumination 30% Phase: Waning Crescent; Moon at 24 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 191451 AFDCHS

Area Forecast Discussion National Weather Service Charleston SC 951 AM EST Sun Jan 19 2020

SYNOPSIS. A cold front is expected to move through this morning, followed by high pressure prevailing through the middle of the week. A low pressure system could impact the area this weekend.

NEAR TERM /THROUGH TONIGHT/. The cold front is now moving into the forecast area with wind shift and plummeting dewpoints now appearing across the Midlands and central Savannah River Area. Periods of light rain will continue over our area through early afternoon before drier air filters in. High temps are tricky as they will be heavily dependent on exactly when the front moves through, as well as if any pockets of sunshine occur. Compression ahead of the front could briefly push temps in the coastal corridor to near 70 before temps drop in wake of the front.

Tonight: Cold air advection pattern in store for the area as surface high pressure builds from the NW. Skies will be mainly clear and a advection freeze is certainly possible to the west of U.S. 17, even down into GA by sunrise Monday morning.

SHORT TERM /MONDAY THROUGH WEDNESDAY/. Monday and Tuesday: Dry and cold high pressure will prevail at the sfc while a broad trough of low pressure expands across the East Conus. The pattern will result in noticeably colder temps by Monday with afternoon highs some 15-20 degrees lower than the previous day. Temps should be even colder on Tuesday as the center of a mid-lvl low rounds the southern base of the trough and shifts across the Southeast while northeast winds prevail within high pressure at the sfc. In general, high temps will range in the mid 40s across Southeast South Carolina and upper 40s across Southeast Georgia Monday afternoon, then struggle to reach the lower 40s across Southeast South Carolina and middle 40s across Southeast Georgia Tuesday afternoon. Overnight periods will be especially chilly as cold air advection peaks and northerly sfc winds persist across the area under clear skies. In general, overnight lows will range in the mid/upper 20s inland to lower 30s at the beaches each night.

Wednesday: A large area of high pressure centered over the Midwest will gradually shift toward the Northeast by mid-week while a mid- lvl low drifts further offshore across the western Atlantic. Sfc winds will respond by becoming slightly more onshore (northeast) while mid-lvl ridging occurs throughout the day. Temps will begin a warming trend, peaking in the lower 50s under mostly sunny skies.

LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/. A large area of high pressure will become centered across the Mid- Atlantic states Thursday into Friday while a mid-lvl ridge axis persists along the eastern seaboard. The pattern will favor a warming trend during the second half of the week as sfc winds turn more directly onshore under ridging aloft. In general, high temps should range in the upper 50s to lower 60s Thursday, then middle/upper 60s on Friday. Temps could be limited somewhat to start off the weekend once a coastal trough develops along the southern edge of high pressure, mainly due to clouds and showers drifting onshore, followed by even a greater chance of precip when deeper moisture advects into the region in advance of a low pressure system and associated sfc cold front approaching from the west. Scattered to potentially numerous showers could persist across much of the area Friday night into Saturday before dry high pressure returns post fropa Saturday night and Sunday. Temps will be mild ahead of the front, remaining in the low/mid 50s Friday night, then peaking in the mid/upper 60s Saturday afternoon. Temps should return to near normal on Sunday with highs generally in the upper 50s to around 60 degrees.

AVIATION /15Z SUNDAY THROUGH THURSDAY/. MVFR cigs and periods of mostly light rains are expected to precede the front this morning. In the vicinity of the frontal trough, there could be some brief IFR cigs. After 18Z, skies will clear and surface winds will veer west and remain gusty at times. VFR tonight with surface flow becoming north.

Extended Aviation Outlook: VFR conditions are then expected at both CHS and SAV terminals through the middle of the week.

MARINE. A cold front will move through the waters this afternoon and SW flow will veer W in the wake of the front. The flow will then veer NW and eventually N tonight. A strong SW low level jet was not mixing well over the cool shelf waters this morning with stronger winds over warmer waters from Buoy 41004 south into the offshore GA waters. Winds across the near shore waters will increase tonight as mixing improves with the onset of low level cold air advection. We may need to extend the SCA for Charleston nearshore waters through tonight as jetting and surging N flow increases. Seas will be chaotic at times with the veering directions through tonight, mainly 3-5 ft close to shore and 5 to 7 ft beyond 20 NM where a SCA will persist.

Monday through Friday: High pressure will build across the waters from the north, favoring elevated winds/seas to start off the week. Small Craft Advisory level conditions will be ongoing across offshore Georgia waters Monday morning, before conditions gradually improve for the remainder of the day. A strong pressure gradient is then expected to develop across the coastal waters heading into Tuesday between high pressure building from the north and low pressure developing offshore. The pattern along with continued cold air advection aloft will likely support Small Craft Advisory conditions across most coastal waters starting Tuesday with peak winds/seas occurring on Wednesday. Gale force conditions are not out of the question for a portion of the coastal waters Wednesday. A Gale Watch/Warning could eventually be needed. In general, north- northeast wind speeds could peak between 25-35 kts Wednesday while seas build to 4-6 ft across nearshore waters and 6-9 ft across offshore waters. Small Craft Advisory level conditions could persist into Thursday, before conditions improve and the flow becomes more onshore as a coastal trough develops along the coast on Friday.

CHS WATCHES/WARNINGS/ADVISORIES. GA . None. SC . None. MARINE . Small Craft Advisory until noon EST Monday for AMZ374. Small Craft Advisory until 6 PM EST this evening for AMZ350.

NEAR TERM . JRL 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 mi2.1 hrsN 04.00 miMostly Cloudy with Haze63°F59°F88%1015.9 hPa

Link to 5 minute data for KJZI

Wind History from JZI (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW3
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1 day agoCalmCalmCalmE4
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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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GEOS Local Image of Southeast    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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Charleston, SC (10,2,3,4)
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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 numerous 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.