Marine Weather and Tides
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.
|Sunrise 6:50AM||Sunset 5:18PM||Saturday November 17, 2018 11:53 AM EST (16:53 UTC)||Moonrise 2:10PM||Moonset 1:02AM||Illumination 72%|
7 Day Forecast for Marine Location Near Isle of Palms, SCHourly EDIT Help
Area Discussion for - Charleston, SC  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus62 kchs 171523|
area forecast discussion
national weather service charleston sc
1023 am est Sat nov 17 2018
High pressure will dominate the pattern through the weekend.
Another cold front may move through the region by mid week,
followed by high pressure through mid to late week.
Near term through tonight
Surface high pressure will remain the dominant feature today,
with sunny skies and relatively light winds. Given the more
northeast position of the high compared to yesterday, low-level
thicknesses support considerably warmer temps with highs
reaching the mid to upper 60s.
Tonight: dry weather will persist. Temps should not be as cold
since low level dew points are forecast to remain elevated in
the low to mid 40s well inland to near 50 degrees along the
coast. A weak coastal trough offshore will develop. The onset of
developing isentropic ascent should result in an expansion of
late night stratocumulus into the forecast area but 850-500 mb
condensation pressure deficit progs appear too dry for any
sprinkles or light showers through 6 am on Sunday along the ga
Short term Sunday through Tuesday
Primarily dry conditions are anticipated through at least Tuesday as
surface high pressure persists under nearly zonal flow aloft.
Reasonable model agreement that a weak ripple in the upper level
pattern will migrate west to east over the forecast area late Sunday
into Monday with a coincident coastal trough located just offshore.
Precipitable water values approaching and possibly exceeding an inch
will migrate towards the shoreline during this period, with the bulk
of this moisture occurring in the 900-800 mb layer. The latest
synoptic models agree that 700-300 mb mean relative humidity levels
will remain relatively low, in the 30-40 percent range, as well as a
relatively dry layer persisting below the apparent cloud level. All
things considered, the models might be overproducing precipitation
during the late Sunday through Monday period, but slight chance pops
will be maintained in the forecast, primarily for southern coastal
and marine zones.
Long term Tuesday night through Friday
A likely dry surface cold front looks to cross the forecast area
late Tuesday or very early Wednesday, followed by additional high
pressure which should persist into late next week. Model divergence|
increases by the end of the week. Onshore flow and increasing
moisture levels will set the stage and a developing coastal trough
or possible surface low could provide the forcing for precipitation
production heading into the weekend.
Aviation 16z Saturday through Wednesday
Vfr through 12z Sunday. Stratocumulus will increase from the
atlantic late tonight, very slim chances of MVFR at ksav toward
Extended aviation outlook:VFR conditions are expected to prevail at
both terminals through mid-next-week, although brief periods of
flight restrictions will be possible late Sunday through early
Monday due to shower activity.
Through tonight, winds will be below 15 kt and seas 2-3 ft near
shore and 3-4 ft beyond 20 nm off the ga coast. High pressure
will settle north of the waters and this should ensure the flow
becomes and remains northeast. The development of a weak coastal
trough late tonight may result in a few light showers over ga
waters toward dawn on Sunday.
Relatively benign conditions are anticipated through mid-next-week
over marine zones with high pressure remaining as the dominant
influence. An increase in cloud cover and possibly shower activity
is possible primarily late Sunday into Monday as a weak coastal
trough develops just offshore while an upper level weakness
propagates over or near the forecast area. Expect winds to peak in
the 10 to 15 knot range with seas averaging 2 to 4 feet. Forecast
uncertainty begins to decrease late in the week as model guidance
diverges, with increasing winds and seas possible as surface
Chs watches warnings advisories
short term... Jmc
long term... Jmc
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Charleston Executive Airport, SC||171 mi||59 min||ENE 7||5.00 mi||Fair with Haze||61°F||50°F||68%||1024.4 hPa|
Wind History from JZI (wind in knots)
|1 day ago||NW||W||NW|
|2 days ago||N|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help
EDIT (on/off)  Help
Weather Map and Satellite Images(on/off)  HelpWeather Map
GOES 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
Wind Forecast for Charleston, SC (11,2,3,4)(on/off)  Help
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