Friday, October20, 2017

Marine Weather and Tides
Isle of Palms, SC

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 7:27AMSunset 6:41PM Friday October 20, 2017 2:02 PM EDT (18:02 UTC) Moonrise 6:55AMMoonset 6:28PM Illumination 0% Phase: New Moon; Moon at 0 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 201713
area forecast discussion
national weather service charleston sc
113 pm edt Fri oct 20 2017

Strong high pressure will continue over the area, then shift
offshore this weekend. A cold front will likely move through
Monday night into Tuesday before a stronger cold front moves
through Tuesday night ushering in much cooler weather.

Near term through tonight
This afternoon: at this sfc, dry high pressure will expand across
the southeast united states while slowly shifting east toward the
coast. Aloft, a mid upper lvl ridge of high pressure will become
centered over the southeast united states. The pattern will favor
veering winds from northeast to east northeast this afternoon and
slightly warmer conditions than the previous day. In general, high
temps will range in the lower 80s away from the immediate coast.

Tonight: dry high pressure and clear skies will support a strong
radiational cooling night with decoupling winds. Overnight lows will
likely dip into the low 50s well inland to low mid 60s near the
coast where a light onshore wind prevails.

Short term Saturday through Monday
High pressure should keep conditions warm and dry through Saturday
but a few light showers will be possible Saturday night, mainly
along the ga coast, then moreso across the entire forecast area
Sunday as a coastal trough pushes inland. The trough should move
well inland and dissipate by Sunday night but strengthening low-
level onshore flow and deeper moisture moving in from the west ahead
of an approaching cold front upper trough will cause an increase in
rain chances amounts Monday. Although low-level shear helicity will
be on the increase Monday, instability will likely be marginal and
thus the risk for thunderstorms, and especially severe
thunderstorms, appears to be low at this time. Temperatures will be
above normal through the period.

Long term Monday night through Thursday
A potent upper shortwave and or closed low will affect the area
Monday night into Tuesday, pushing an initial cold front through the
area Monday night into Tuesday. Expect a good chance for showers and
some thunderstorms along and ahead of the cold front, followed by
drier and cooler high pressure. Tuesday should be mainly dry,
although some showers could linger, especially near the sc coast
early in the day. A secondary, stronger cold front will then move
through Tuesday night as the main upper trough envelopes the eastern
u.S.. Dry, but cooler conditions will then prevail through Thursday
before some moderation occurs late in the week as high pressure
quickly shifts offshore allowing a return flow to set up.

Temperatures should stay above normal through Tuesday before falling
at or below normal through Thursday night. Many inland areas should
get into the 40s Thursday Friday mornings.

Aviation 17z Friday through Tuesday
Vfr conditions will prevail at both chs and sav terminals through
18z Saturday. However, patchy ground fog can not be ruled out late
tonight to around daybreak, mainly at the sav terminal. Confidence
remains too low to include lower vsbys in response to ground fog at
this time.

Extended aviation outlook: brief flight restrictions are possible
Sunday due to low clouds showers. Higher chances of flight
restrictions are expected Sunday night through Monday night,
possibly into Tuesday, as a cold front affects the area with heavier
showers and potentially some thunderstorms.

This afternoon and tonight: sfc high pressure centered north of the
area will shift east off the mid-atlantic coast, helping weaken the
pressure gradient over local waters. As a result, northeast winds
and seas will steadily decrease this afternoon with conditions
remaining below small craft advisory levels for most waters. The
only exception will be over offshore georgia waters where 6 ft seas
linger into early afternoon hours. For this reason, a small craft
advisory will continue in offshore georgia waters until 2 pm. Winds
should be no higher than 15 kt and seas no higher than 3-4 ft
overnight while high pressure prevails.

Saturday through Wednesday: conditions will deteriorate a bit this
weekend as a cold front approaches from the west and likely moves
through early Tuesday. Another stronger cold front will then move
through Tuesday night. A small craft advisory may be needed starting
Saturday night for seas reaching 6 feet beyond 20 nm, then likely
remain into Wednesday.

Rip currents... Steady northeast winds, long period swell from the
east and astronomical influences associated with a recent new moon
should support an elevated risk of rip currents this afternoon,
mainly along georgia beaches. A moderate risk of rip currents
will continue for the georgia beaches into the evening.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory until 2 pm edt this afternoon for amz374.

Near term... Dpb
short term... Rjb
long term... Rjb
aviation... Dpb rjb
marine... Dpb rjb

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC171 mi67 minN 010.00 miFair77°F60°F57%1024.4 hPa

Wind History from JZI (wind in knots)
Last 24hr6
1 day agoN10N8E11
2 days agoN11

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Southeast    EDIT

Wind Forecast for Charleston, SC (14,3,4,5)
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Ground Weather Radar Station Wilmington, NC
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weather_mapweather_map weather_map

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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 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 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.