Tuesday, January16, 2018 L-36.com

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 7:20AMSunset 5:38PM Tuesday January 16, 2018 2:05 PM EST (19:05 UTC) Moonrise 6:42AMMoonset 5:23PM Illumination 0% Phase: New Moon; Moon at 29 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 161743
area forecast discussion
national weather service charleston sc
1243 pm est Tue jan 16 2018

High pressure will linger over the region today. A cold front
will sweep across the area Wednesday morning, followed by dry
high pressure into late week. Warmer conditions arrive this
weekend before another cold front pushes through Monday. Dry
high pressure will then return on Tuesday.

Near term through tonight
High pressure will maintain quiet weather across the forecast
area today. Upstream, an upper trough will shift into the ohio
river valley, while an associated cold front moves into the
western carolinas northwest georgia by late in the day. High
clouds will generally be on the increase through the afternoon. Otherwise,
expect light winds with temperatures a touch cooler than
normal. High temperatures will mainly be in the mid 50s, with
some upper 50s close to the altamaha. Ongoing forecast was in
good shape, so only minor tweaks were needed.

Tonight: clouds will continue to thicken and increase ahead of the
cold front and this should hold temps above freezing most areas
tonight, although we could see a few of our colder inland spots
touch freezing if clouds fail to thicken earlier than later. A
deep upper trough is forecast to dig into the lower gulf coast
region overnight, driving the cold front into the forecast area
prior to daybreak. We introduce some slight chance pops across
far inland ga and sc zones bordering the csra. Model forecast
soundings suggest light rain and sleet could mix prior to dawn
in this area as band of enhanced moisture accompanies the frontal
zone. No accumulations are expected in the overnight period.

Short term Wednesday through Friday
Wednesday: a cold front will quickly shift through the area early
morning with strong cold air advection in its wake. Guidance
continues to show the bulk of precip occurring over the area well
behind the sfc cold front where strong upper lvl divergence occurs
with a passing h25 jet aloft. Timing will be key in regards to rain
and or mixed precipitation well inland, possibly in the form of
light snow flurries or sleet. The main issue will be how cold the
boundary layer becomes as moisture quickly traverses the area, then
departs to our north and offshore by early afternoon. Clouds should
keep sfc temps above freezing during morning hours for all areas,
but most guidance suggests air will be cold enough off the sfc to
produce some snow flurries or sleet over inland areas for a few
hours Wednesday morning. Locations along and west of the i-95
corridor in southeast south carolina and well inland and north of i-
16 in southeast georgia should have the greatest chance of seeing
precip in the form or snow or sleet. However, any wet snow
flakes flurries sleet will likely melt quickly once it reaches the
sfc, thus no accumulation is expected. Dry high pressure entering
from the west should put an end to most if not all precip by early
afternoon. However, if any precip lingers over the tri-county area
it will likely remain in the form of light rain. Afternoon temps
will remain well below normal behind the cold front. In general,
temps will peak in the low mid 40s around noon, then follow a
cooling trend into the evening.

The next issue will turn to wind chill temps Wednesday night. Dry
high pressure will lead to clear skies and sfc temps that cool off
rapidly. In general, temps should dip into the low mid 20s over most
areas. These temps along with a light northwest wind could produce
wind chill values near 15 degrees across the area. A wind chill
advisory could be needed for coastal counties.

Thursday and Friday: dry sfc high pressure will build over the
southeast behind a mid upper lvl trough departing off the east coast
on Thursday. The setup will support temps well below normal on
Thursday with afternoon highs peaking only in the mid 40s. Thursday
night lows will be chilly under clear skies, dipping into the mid
20s away from the coast. By Friday, noticeably warmer conditions are
expected as dry high pressure becomes centered over or near the
area. In general, temps should peak in the mid 50s Friday afternoon
under a full Sun and ridging aloft.

Long term Friday night through Monday
High pressure will prevail over the southeast united states this
weekend and early next week before a cold front arrives Monday. The
pattern will favor warming conditions each day under ridging aloft.

In general, afternoon highs will peak in the lower 60s on Saturday,
then upper 60s to around 70 degrees on Sunday. By Monday, southerly
winds will help advect deep moisture over the southeast and produce
some cloud cover ahead of the approaching front. This should limit
overall high temps to the upper 60s for most locations. Chances of
showers will arrive to most areas by Monday afternoon as the front
begins to shift over the region. Dry high pressure will then return
on Tuesday behind the departing cold front. Temps will be cooler,
but should remain at or just a few degrees above normal. In general,
afternoon temps should peak in the lower 60s.

Aviation 18z Tuesday through Sunday
Vfr expected through much of the period. The exception could be
late Wednesday morning when a brief period of sub-vfr ceilings
may affect the terminals behind a cold front. Light rain also a
possibility, although have opted to leave mention out for now
until confidence in timing and coverage is higher. If it occurs,
it would be towards the end of the valid TAF cycle.

Extended aviation outlook:VFR conditions are expected at both chs
and sav terminals Wednesday afternoon through Saturday. A cold front
could bring gusty winds at both terminals Wednesday afternoon.

Winds will be light and occasionally variable close to shore
today, as high pressure weakens over the forecast area. Northeast
flow will prevail off the coast with speeds mostly less than 10
kt. There is still some lingering swell wave and seas will continue
to be a bit elevated, 2-4 ft within 20 nm and 3-5 ft well offshore.

Winds will likely back offshore late as a cold front moves in late.

Prior to sunrise, there may be the beginning of a surge off the
ga coast with speeds increasing to 15 kt. Otherwise, light winds
and seas ranging 2-3 ft near shore and 3-5 ft beyond 20 nm off
the ga coast.

Wednesday through Sunday: winds seas will remain below small craft
advisory levels Wednesday morning while high pressure persists over
coastal waters ahead of a quickly approaching cold front. Conditions
are then expected to deteriorate Wednesday afternoon evening as
strong cold air advection occurs behind the passing cold front.

Small craft advisory level conditions are likely for most waters
outside the chs harbor by Wednesday evening and should continue into
early Thursday morning. Winds seas will then diminish subside
through much of Thursday as the pressure gradient weakens in
response to high pressure building over the waters. High pressure
will dominate the weather pattern over the weekend into early next
week, supporting conditions that remain well below small craft
advisory levels.

The kclx radar is out of service until further notice. Technicians
are troubleshooting and working on repairs.

The downtown charleston observation site (chls1 cxm) will be
unavailable until further notice.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... None.

Near term... Ect
short term... Dpb
long term... Dpb

marine... Dpb

Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charleston Executive Airport, SC171 mi71 minN 010.00 miFair55°F26°F33%1029.8 hPa

Wind History from JZI (wind in knots)
Last 24hrN9N7N7N6CalmCalmCalmCalmCalmCalmCalmCalmNW3N5N4N5CalmN5Calm5CalmCalmN44
1 day agoNE7N7
2 days agoNW10N11NW8

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 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.