Thursday, April25, 2019 L-36.com


Marine Weather and Tides
Yemassee, SC

Version 3.4
What's New / NOTES
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 6:41AMSunset 8:00PM Thursday April 25, 2019 8:06 PM EDT (00:06 UTC) Moonrise 12:20AMMoonset 10:40AM Illumination 60% Phase: Waning Gibbous; Moon at 21 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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AMZ352 Waters From Edisto Beach Sc To Savannah Ga Out 20 Nm- 654 Pm Edt Thu Apr 25 2019
Tonight..S winds 15 kt. Seas 2 to 3 ft, building to 3 to 4 ft after midnight. A chance of showers with a slight chance of tstms after midnight.
Fri..SW winds 15 to 20 kt with gusts to 25 kt. Seas 3 to 4 ft, building to 4 to 5 ft in the afternoon. A chance of showers with a slight chance of tstms.
Fri night..W winds 15 to 20 kt, becoming nw 10 to 15 kt after midnight. Seas 3 to 4 ft. A slight chance of showers and tstms in the evening.
Sat..N winds 10 to 15 kt, becoming se 5 to 10 kt in the afternoon. Seas 2 to 3 ft.
Sat night..S winds 10 kt. Seas 2 ft.
Sun..SW winds 10 kt. Seas 2 ft.
Sun night..S winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 ft.
Mon..E winds 5 to 10 kt. Seas 2 ft.
Mon night..SE winds 5 to 10 kt. Seas 2 ft.
Tue..S winds 5 to 10 kt. Seas 2 ft.
Tue night..S winds 5 to 10 kt. Seas 2 ft. Mariners are reminded that winds and seas higher in and near tstms.
AMZ300 654 Pm Edt Thu Apr 25 2019
Synopsis for the coastal waters of south coastal south carolina and north coastal georgia.. High pressure will prevail through the evening. Low pressure and a cold front will bring unsettled weather on Friday. High pressure will then return for the weekend and prevail through the first half of next week.


7 Day Forecast for Marine Location Near Yemassee, SC
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location: 32.68, -80.74     debug


Area Discussion for - Charleston, SC
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Fxus62 kchs 252350
afdchs
area forecast discussion
national weather service charleston sc
750 pm edt Thu apr 25 2019

Synopsis
High pressure will prevail through the evening. Low pressure
and a cold front will bring unsettled weather on Friday. High
pressure will then return for the weekend and prevail through
the first half of next week.

Near term until 6 am Friday morning
Tonight: high pressure at the surface over the western atlantic
will gradually retreat as a trough of low pressure and
associated cold front shift over the deep south. Mild and dry
conditions will likely persist through the early part of tonight
under increasing high mid clouds. The mid upper level ridge of
will quickly shift offshore by midnight as a pre-frontal h5
shortwave advances west to east across the region during the
second half of the night. There remains some of inconsistency
between models in regards to how much precip instability
develops across the area after midnight. Some suggest dry low-
mid lvl air for a fair amount of time overnight. However,
sufficient forcing associated with the passing h5 shortwave
could spawn a few showers thunderstorms late as
moisture instability characterized by sfc dewpts in the low mid
60s, pwats near 1.4 inches and SBCAPE between 500-1000 j kg peak
along areas east of the i-95 corridor. Any thunderstorms that
develop should remain below severe limits given strongest
forcing remains west-northwest of the area near the approaching
cold front. However, an isolated stronger thunderstorm or two
with gusty winds can not be ruled out toward sunrise given 35-40
kt low- lvl wind fields traversing the area. Temps will remain
mild within a southerly flow under clouds through the night. In
general, lows will only dip into the mid upper 60s, more than 10
degrees above normal.

Short term 6 am Friday morning through Sunday
Friday: an elongated trough from the western great lakes to florida
at the start of the period will deepen and shift east. A weak short
wave embedded in the larger trough will be just northeast of the
area at start the day and this should result in a tendency toward
some sinking motion while drier air moves in at the mid and upper
levels. This combined with a strong signal from the models that
strong significant convection will move east across the northeast
gulf of mexico and into florida early on Friday while more
significant convection and lift moves from northern georgia into
western north carolina. Also, the timing of front is not optimal to
develop significant instability out ahead of it and the model show
just modest instability developing mainly along the coast. Bottom
line, it appears that this split in the precipitation will result in
a lower threat for precipitation and for lighter precipitation amounts
for our cwa. Therefore have lowered rain chances to no more than 50
percent for Friday. With the dry mid levels, cannot rule out a
strong thunderstorm along the front with wind being the primary
threat, but at the present time am not sure how much precipitation
there will be with the front. The precipitation should end from
southwest to northeast rather quickly Friday afternoon. Friday will
be quite windy both ahead of the front and behind it with some wind
gusts up 30 to 35 mph possible. Wind gusts on lake moultrie are
close to lake wind advisory levels, but will defer to the overnight
shift to make the final call. Highs away from the coast will be in
the lower 80s, with generally 50s in the wake of the front Friday
night.

Saturday and Sunday: modest mid level west-northwest to west flow
aloft will prevail in the wake of the large scale trough moving away
from the area. Surface high pressure will build over the area
Saturday, then move offshore Saturday night and into Sunday. Dry air
and subsidence will result dry conditions and little if any cloud
cover. High temperatures will be near normal Saturday and a several
degrees above normal on Sunday.

Long term Sunday night through Thursday
Models are in good agreement showing high pressure over or
nearby our area during the long term, bringing dry conditions
and temperatures at or slightly above normal.

Aviation 00z Friday through Tuesday
Overnight: expectVFR conditions to prevail at both kchs and
ksav through most of the night. The gusty winds have subsided at
both sites this evening, but are expected to remain around 10
knots all night. A cold front will approach the area from the
west late tonight, bringing a slight chance for showers and
perhaps even a thunderstorm just before daybreak Friday.

Shower thunderstorm chances will increase through Friday
morning as the cold front approaches. Have maintained vcsh at
both terminals near daybreak Friday,persisting into early
Friday afternoon. Even with scattered showers and isolated
thunderstorms in the area, have keptVFR cigs. Best chances for
thunder continue to be from after sunrise to early afternoon.

Expect any precip. Chances to quickly end between 18 and 20z.

Extended aviation outlook: gusty winds are possible into Friday
evening.VFR conditions are expected Friday night through Monday.

Marine
Tonight: no significant changes were made with the evening
update. A southwest flow will persist between atlantic high
pressure centered well offshore and low pressure shifting
through the deep south this evening. The strongest winds remain
near the coast, with generally 15-20 kts from beaufort, sc
northward, including charleston harbor. The pressure gradient
will gradually tighten after midnight as a cold front approaches
from the west late. Therefore, southerly winds are expected to
remain elevated across all waters, in the 15-20 kt range, while
seas build up to 3-4 ft across nearshore waters and 4-5 ft
across offshore georgia waters. Still think conditions will
remain below small craft advisory levels through daybreak.

However, a few showers and or thunderstorms could produce
locally stronger wind gusts late.

Friday: increasing surface pressure gradient ahead of an approaching
cold front and then a tight pressure gradient and good mixing behind
the front will result in elevated winds Friday and Friday evening.

Looks like frequent wind gusts of at least 25 knots will occur in
amz374 and amz330 during the afternoon and evening hours as well as
seas up to 6 feet. As a result, have issued a small craft advisory
for these marine areas from 16z through 04z. The winds are close for
charleston harbor and amz352 to be included, but have left them out
for now. Winds and seas will gradually subside Friday night.

Saturday through early next week: high pressure over or near
the area will dominate the forecast, bringing tranquil marine
conditions.

Chs watches warnings advisories
Ga... None.

Sc... None.

Marine... Small craft advisory from noon Friday to midnight edt Friday
night for amz350-374.

Near term... Dpb rfm
short term... Mte
long term... Ms
aviation... Dpb mte
marine... Dpb mte


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
ACXS1 - ACE Basin Reserve, SC 17 mi81 min SSE 2.9 74°F 1013 hPa64°F
41033 33 mi118 min SSW 14 G 19 71°F 70°F1014 hPa
CHTS1 44 mi36 min S 9.9 G 13 72°F 71°F1013.4 hPa
FBIS1 - Folly Island, SC 45 mi66 min SSW 13 G 16 71°F 1014.5 hPa (-0.3)67°F
FPKG1 - 8670870 - Fort Pulaski, GA 45 mi36 min SSE 8.9 G 15 72°F 69°F1013.1 hPa

Wind History for Charleston, SC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Beaufort, Marine Corps Air Station, SC14 mi10 minSSE 710.00 miMostly Cloudy73°F66°F79%1012.6 hPa
Walterboro Lowcountry Regional Airport, SC17 mi11 minN 010.00 miFair73°F59°F61%1012.9 hPa
Beaufort County Airport, SC19 mi11 minS 610.00 miFair72°F60°F69%1012.9 hPa

Wind History from NBC (wind in knots)
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Last 24hrS4S6SW5SW6SW4S4SW4--SW4W7W6W5W4W6SW5W6S12
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1 day agoS7S7S5S5S5S3SW4SW7SW7SW6CalmSW4SW6W3W9W11W12W11
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2 days agoS5S4S3SW3CalmCalmCalmCalmCalmCalmCalmCalmSW7SW7SW7S3SE5SE8SE8SE9SE8SE8SE6S6

Tide / Current Tables for Bluff Plantation, Combahee River, South Carolina
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Bluff Plantation
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Thu -- 01:20 AM EDT     Moonrise
Thu -- 05:17 AM EDT     3.09 feet High Tide
Thu -- 06:42 AM EDT     Sunrise
Thu -- 11:23 AM EDT     0.37 feet Low Tide
Thu -- 11:40 AM EDT     Moonset
Thu -- 05:39 PM EDT     2.71 feet High Tide
Thu -- 07:59 PM EDT     Sunset
Thu -- 11:23 PM EDT     0.52 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.71.31.92.42.93.132.621.40.70.40.40.81.31.82.32.62.72.41.91.30.80.5

Tide / Current Tables for Sheldon, Huspa Creek, Whale Branch, South Carolina
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Sheldon
Click for Map
Thu -- 01:20 AM EDT     Moonrise
Thu -- 03:22 AM EDT     8.11 feet High Tide
Thu -- 06:42 AM EDT     Sunrise
Thu -- 09:24 AM EDT     0.79 feet Low Tide
Thu -- 11:41 AM EDT     Moonset
Thu -- 03:45 PM EDT     7.10 feet High Tide
Thu -- 07:59 PM EDT     Sunset
Thu -- 09:24 PM EDT     1.09 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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4.76.27.48.17.975.43.51.90.90.91.83.24.666.97.16.453.421.21.22.1

Weather Map and Satellite Images
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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.
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Wind Forecast for Charleston, SC (20,4,5,8)
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Ground Weather Radar Station Charleston, SC
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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.