Marine Weather and Tides
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
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|Sunrise 6:45AM||Sunset 7:59PM||Wednesday August 21, 2019 3:23 AM EDT (07:23 UTC)||Moonrise 10:27PM||Moonset 10:53AM||Illumination 69%|
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 210450|
area forecast discussion
national weather service charleston sc
1250 am edt Wed aug 21 2019
Atlantic high pressure and an inland trough will prevail
through late week. A cold front push into the region this
weekend then will stall over or just south of the area through
early next week.
Near term until 6 am this morning
Midnight update: we trimmed back some inland pops per latest
radar and model guidance, still possible some remnant showers
reach the northwest tier of zones by dawn.
Latest guidance indicates convection over the sc midlands will
likely persist inland from our forecast region overnight,
tending to dissipate between 06z and 09z. Overnight, the low-
level steering flow will veer with time which should keep any
noctural, marine-based convection confined to the coastal
Lows will range from the mid 70s inland to around 80 at the
Short term 6 am this morning through Friday
Wednesday through Friday: expect typical conditions for the latter
half of august, featuring scattered showers thunderstorms,
especially midday into early evening, and slightly above normal
temperatures with highs mainly in the lower 90s and lows in the
lower middle 70s inland and in the upper 70s near 80f on the
beaches. As usual, maximum heat index values in the 100-105f range
will be locally punctuated by the cooling influence of
Of note, the southern periphery of low pressure an associated pool
of mid-level vorticity centered near the nc va coast will brush our
region Wednesday, and this could enhance diurnal thunderstorm
coverage to some degree, particularly across sc counties. Otherwise,
thunderstorms will focus along the sea breeze and other mesoscale
boundaries through late week, so precise placement of thunderstorms
will remain elusive beyond the near-term forecast period. Also, a
cold front will approach the region Friday, but latest guidance
suggests that this boundary could remain too far to the north to
influence thunderstorms coverage across our region, unless organized
convection upstream manages to hold together to push into our area
late afternoon or during the evening. Meanwhile, pwat values
exceeding 2 inches will support locally heavy rainfall, while
diurnal instability will provide a daily potential for a
brief isolated severe thunderstorm. However, the potential for
significant coverage of excessive rainfall or for significant severe
weather will remain low through late week.
Long term Friday night through Tuesday |
Low to moderate confidence this period. The pattern doesn't change
much until a cold front likely pushes into the area this weekend,
possibly moving through southeast ga as well early next week. We
prefer the slower wpc ECMWF guidance with regard to the frontal
passage timing. Eventually a more fall-like high pressure wedge
pattern should set up and feature cooler temperatures and above
normal rain chances. Think the severe storm risk will be low with
possibly a better risk for some flooding given the deep moisture and
weak storm motions leading to some training.
Aviation 04z Wednesday through Sunday
Vfr. Afternoon showers tstms will once again develop near the
terminals this afternoon. Impact probabilities are too low to
justify a mention of tsra at either terminal this far out.
Extended aviation outlook: occasional flight restrictions at
kchs ksav each day through Friday, mainly from afternoon evening
showers and thunderstorms. However,VFR most of the time during this
period. More frequent significant flight restrictions are likely this
weekend due to increased moisture and a cold front moving south
through the area.
Overnight: southerly winds will prevail with speeds around 10 kt.
Seas of 1-2 ft will build to 2-3 ft overnight.
Wednesday through Sunday: winds seas are expected to remain below
small craft advisory levels. However, thunderstorms will produce
locally hazardous conditions at any time. Through Saturday,
south southwest winds should average 10-20 knots, with strongest
winds likely during the daily sea breeze and at night give typical
nocturnal trends. A weakening cold front could push through the
waters by Sunday, and winds could turn toward the east. Seas outside
thunderstorms will average 1-3 feet through Saturday, highest beyond
20 nm, then seas could build slightly to 2-4 feet Sunday.
Chs watches warnings advisories
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. Follow links for more data.
|Charleston Executive Airport, SC||171 mi||29 min||N 0||10.00 mi||Fair||81°F||77°F||89%||1019.3 hPa|
Link to 5 minute data for KJZI
Wind History from JZI (wind in knots)
|1 day ago||W||Calm||Calm||Calm||SW||W||Calm||SW||S||SE||S||S||S||S||S||S||S||Calm||Calm||S||S||S||S||SW|
|2 days ago||SW||SW||SW||SW||Calm||W||W||W||W||W||S||SW||S||SW|
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GOES 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.
Link to Loop
Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Charleston, SC (3,6,7,8)(on/off)  Help
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