Saturday, November18, 2017

Marine Weather and Tides
Belville, NC

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 6:47AMSunset 5:07PM Saturday November 18, 2017 3:05 AM EST (08:05 UTC) Moonrise 6:43AMMoonset 5:37PM 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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AMZ250 Coastal Waters From Surf City To Cape Fear Nc Out 20 Nm- 817 Pm Est Fri Nov 17 2017
Overnight..E winds 10 kt, becoming se. Seas 2 to 3 ft, up to 4 ft outer waters off cape fear.
Sat..SW winds 10 to 15 kt with gusts up to 20 kt late. Seas 2 to 3 ft, building to 3 to 4 ft in the afternoon.
Sat night..SW winds 15 to 20 kt, increasing to 25 to 30 kt after midnight. Seas 4 to 6 ft, building to 5 to 7 ft after midnight. A chance of showers.
Sun..W winds 20 to 25 kt, becoming nw 15 to 20 kt in the afternoon. Seas 5 to 7 ft, subsiding to 3 to 5 ft in the afternoon. A chance of showers.
Sun night..N winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Mon..N winds 10 to 15 kt, diminishing to 10 kt in the afternoon. Seas 2 to 3 ft.
Mon night..NE winds 10 kt or less. Seas 1 to 2 ft.
Tue..E winds 10 kt. Seas 1 to 2 ft, then 2 ft. A chance of showers through the night.
Wed..N winds 10 kt, becoming ne 10 to 15 kt. Seas 2 to 3 ft.
AMZ200 817 Pm Est Fri Nov 17 2017
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles.. Center of high pressure will migrate overhead tonight and push across the local waters and offshore during Saturday. A strong cold front tracking southeastward, will move off the carolina coasts and across the local waters late Saturday night and well offshore during Sunday. Strong high pressure will follow and build across the local waters Sunday through the middle of next week.

7 Day Forecast for Marine Location Near Belville, NC
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location: 34.23, -77.95     debug

Area Discussion for - Wilmington, NC
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Fxus62 kilm 180537
area forecast discussion
national weather service wilmington nc
1237 am est Sat nov 18 2017

A cool night tonight will be followed by a breezy warmup on
Saturday ahead of a strong cold front. The front may be
accompanied by some gusty showers as it sweeps across the area
and offshore late Saturday night and early Sunday morning. Much
colder and drier air will be ushered in for Sunday and into
early next week with the possibility for freeze warnings and or
frost advisories for portions of the forecast area during
Sunday and Monday nights. Temperatures will moderate Tuesday and
Wednesday. Uncertainty increases by the mid to late week period
of next week as another cold front moves into the area and the
forecast will hinge on the track of developing low pressure in
the gulf of mexico.

Near term through today
As of 1130 pm Friday... Temperatures dropping rapidly and faster
than any available guidance suggests. Many mesonet sites now 34
or less, with widespread 36 showing up across the area. Rap
forecast soundings show temps continuing to fall for the next
several hours despite slow moistening of the upper column. For
this reason have issued a frost advisory for portions of the
area. Previous discussion below:
as of 845 pm Friday... Center of high pressure is nearly
overhead. Clear skies, subsidence and a decent sfc based
inversion after sunset, has resulted in excellent radiational
cooling conditions with winds having decoupled and temps
dropping quickly into the low 40s with upper 30s inland by 8 pm.

With sfc dewpoints in the 30s, temperatures for the remainder of
this evening and overnight will either hold steady or fall a few
more degrees as it converges toward the sfc dewpoint. Enough
moisture at ground level combined with temps dropping into the
35 to 39 degree range, patchy frost away from the immediate
coast will occur. Frost could develop as early as late this
evening but expect it during the pre-dawn Sat hours. Mid to
upper level clouds toward sunrise Sat may hamper the rad
cooling conditions enough for temps to rise a few degrees above
frost threshold occurrence.

As of 300 pm Friday... Heading through Saturday, the winds will
shift to the south in a deeper increasing low level return flow
as a cold front begins to make its way toward the carolinas from
the northwest later in the day. Pcp water values down near a
quarter of inch through this evening race back up as high shifts
off the coast into sat. Moisture profiles show potential for
some mainly lower and high clouds through the day on Saturday,
but plenty of mid level dry air and subsidence will keep any pcp
out of the forecast until after the near term period when cold
front moves in. May see decent cloud layer under subsidence
inversion just under 6k ft by 21z.

Overall expect a breezy and warm day as temps recover nicely in
waa. The 850 temps jump back up to near 12c through Sat aftn.

Temps will reach up into the 70s most places, but an increase in
clouds may hold back temps a bit.

Short term tonight through Sunday night
As of 300 pm Friday... Impressive cold front due Saturday night.

And though the baroclinicity is considerable and wind fields
quite strong guidance continues to insist on a low QPF event.

Given the quick movement of the boundary and its associated
forcing this seems very plausible. Forecast soundings show
enough lack of instability to keep thunder out of the
forecast... But a deep enough convective shower may be able to
mix down 40-50kt winds to the surface as such wind speeds may be
lurking a mere 2000-2500ft up. Cold advection Sunday drops
850mb temps from 8c to 2c from 12z to 00z. NW flow continues
Sunday night but warm advection kicks in as low level thermal
ridge builds in from the west. This advection will occur above
the surface-based boundary layer however and Sunday night lows
will be in the low to mid 30s and a freeze warning may be needed
for northwestern zones.

Long term Monday through Friday
As of 300 pm Friday... A split upper pattern will exist next week
across north america. A series of shortwaves moving across
southeastern canada in the northern stream will have relatively
little impact on the carolinas, however a pair of shortwaves in the
southern stream will have impacts on our sensible weather Tuesday
and Thursday night into Friday.

Canadian high pressure at the surface Monday will move eastward and
off the coast late Monday night. Model support for this idea is
quite high. Veering low-level winds and a warm advection pattern
developing Tuesday and Tuesday night should support the development
of a coastal trough as a weak shortwave approaches from the
southwest. There are significant model differences in the track the
shortwave takes (ecmwf from south ga to CAPE fear; GFS from central
ga to near norfolk) which then determine how well-developed the
surface system can become. A compromise solution should advect
enough shallow atlantic moisture back onshore for a 20-30 percent
chance of showers Tuesday night, clearing out by Wednesday morning
as the shortwave moves offshore. Cold air will sneak south as
another canadian high moves across the ohio valley. This should keep
highs on thanksgiving day only in the upper 50s to around 60, a good
6-8 degrees below normal.

Attention then turns to a much stronger shortwave diving into the
western and central gulf of mexico Wednesday night and Thursday.

Just like yesterday there are still model differences here, with the
ecmwf slower than the GFS with the eastward movement of the trough
across the gulf of mexico Thursday and Friday. A compromise solution
of the operational gfs, ecmwf, and their ensembles brings rain
chances into the area Thursday night through Friday night, but given
all the uncertainty (and to better blend with surrounding nws
offices) i'm capping pops no higher than 30 percent for now.

Aviation 06z Saturday through Wednesday
As of 06z... High confidence in primarilyVFR this valid period
although some light fog this morning may produce some short
duration restrictions.

High pressure overhead is creating nearly cloudless sky conditions
this morning. Temp dewpoint spreads are very low, but moisture is
quite shallow so fog is not expected. Local ups fog procedure did
produce a few areas of patchy fog, but have kept out any mention in
tafs attm. Cannot rule out some short duration MVFR, especially at
lbt or cre, but will handle this with an amd if it becomes
necessary. Otherwise,VFR will be the rule through the valid period
with only few sct diurnal CU this aftn beneath increasing cirrus.

The biggest impact today will be increasing winds, especially this
evening and tonight, as speeds rise to 10-15 kts with gusts of 20-25
kts from the sw. Winds are not likely to ease after dark as the
gradient pinches ahead of a cold front. This front will bring gusty
showers to the terminals Saturday night, but most of this activity
will hold off until after 06z Sunday, and have only a mention of
vcsh at the inland terminals before that.

Extended outlook... Showers and possible MVFR Saturday night
into Sunday along with gusty winds.VFR Monday and Tuesday.

Showers possible Wednesday.

Near term through Saturday ...

as of 845 pm Friday... The center of sfc high pressure will
basically be overhead this evening and overnight before
progressing off the coast and offshore during sat. Winds will
drop to NE at 5 to 10 kt with possible calm conditions across
portions of the local waters due to a well relaxed sfc pg. The
progged sfc pressure pattern indicates once the high moves off
the coast, return flow from off the atlantic will become common
across all waters after sunrise sat. Significant seas initially
will run 2 to 3 ft except up to 4 ft off CAPE fear. Seas will
drop to their lowest Sat morning before picking back up during
sat afternoon and night. A pseudo easterly ground swell will
dominate the local seas initially given the absence of any
notable wind driven waves. This will change during Sat after the
sfc high moves offshore. With increasing wind driven waves
becoming more dominant as morning se-s winds increase that
eventually veer to the SW and W ahead of the approaching cold
front late Sat thru Sat night.

Previous... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .

As of 300 pm Friday... Winds will diminish further as high
pressure shifts closer overhead through tonight. This will also
allow for a veering of winds from NE to E by midnight, shifting
further around to the SE and S through Sat morning as the center
of the high shifts off the coast of hatteras. Overall, winds
will drop off into tonight to under 10 kts before picking up
again through Saturday.

Gradient will tighten through Saturday aftn between high
pressure to the east and a cold front approaching the carolinas
from the nw. Expect winds increasing up to 15 kts by end of
period with gusts up to 20 kts. Seas will remain less than 3 ft
through Sat morning, but increasing southerly winds Sat aftn,
will push seas up to 3 to 4 ft by Sat eve.

Short term Saturday night through Sunday night ...

as of 300 pm Friday... Powerful cold front approaching Saturday
night. A small craft advisory will be issued next forecast cycle
or thereabouts. Both the pre-frontal and post-frontal flow
regimes will support advisory-worthy wind and seas. The actual
fropa and wind shift will come right around daybreak Sunday. At
this time it seems that the ssts being much cooler than the
airmass will preclude pre-frontal gale conditions and later in
the period as the airmass cools the wind fields will weaken
sufficiently to do the same.

Long term Monday through Wednesday ...

as of 300 pm Friday... High pressure will move across the carolinas
Monday, then offshore late Monday night. By Tuesday return flow
behind the departing high will buckle as a coastal trough develops
along the southeast coast. Winds should turn easterly on Tuesday,
then perhaps southeasterly for a time Tuesday night as the trough
makes its closest approach to shore, but by Wednesday morning the
feature should retreat back offshore as high pressure advances
across the ohio valley and shifts our winds to a more northerly

Ilm watches warnings advisories
Sc... Frost advisory until 8 am est this morning for scz017-023-024-

Nc... Frost advisory until 8 am est this morning for ncz087-096-099-

Marine... None.

Synopsis... Tra
near term... Dch jdw
short term... mbb
long term... Tra
aviation... Jdw

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NOXN7 - North Carolina Reserve, NC 7 mi81 min Calm 41°F 1019 hPa
41110 - Masonboro Inlet, NC 14 mi37 min 64°F2 ft
41038 - ILM2 - 5 miles SE of Wrightsville Beach, NC 14 mi58 min S 3.9 G 9.7 58°F 64°F1019.9 hPa
41108 35 mi36 min 64°F2 ft
41037 - ILM3 - 27 miles SE of Wrightsville Beach, NC 35 mi58 min NE 3.9 G 9.7 60°F 67°F1019.6 hPa
41024 - Sunset Nearshore (SUN 2) 39 mi58 min NNE 3.9 G 5.8 53°F 62°F1020 hPa

Wind History for Wrightsville Beach, NC
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Wilmington International Airport, NC4 mi73 minN 010.00 miFair38°F36°F93%1020.5 hPa
Brunswick County Airport, NC22 mi81 minN 010.00 miFair39°F38°F98%1020.3 hPa

Wind History from ILM (wind in knots)
Last 24hrN5N6N10NE10NE14
1 day agoNW7NW5NW5NW4NW4NW6NW9NW12NW9N9NW7W7NW8W4CalmCalmCalmCalmCalmCalmCalmN8N6N5
2 days agoN7N6N5N6N10N8N8N9NE6--N4N7N8N4N4CalmNW6NW6NW3NW4NW4NW5NW6NW6

Tide / Current Tables for Wilmington, North Carolina
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Sat -- 03:30 AM EST     -0.15 feet Low Tide
Sat -- 06:42 AM EST     Moonrise
Sat -- 06:42 AM EST     New Moon
Sat -- 06:47 AM EST     Sunrise
Sat -- 09:21 AM EST     4.96 feet High Tide
Sat -- 04:03 PM EST     0.01 feet Low Tide
Sat -- 05:05 PM EST     Sunset
Sat -- 05:37 PM EST     Moonset
Sat -- 09:32 PM EST     4.39 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Wrightsville Beach, North Carolina
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Wrightsville Beach
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Sat -- 12:42 AM EST     -0.23 feet Low Tide
Sat -- 06:42 AM EST     Moonrise
Sat -- 06:42 AM EST     New Moon
Sat -- 06:46 AM EST     Sunrise
Sat -- 07:00 AM EST     4.32 feet High Tide
Sat -- 01:28 PM EST     -0.20 feet Low Tide
Sat -- 05:05 PM EST     Sunset
Sat -- 05:36 PM EST     Moonset
Sat -- 07:15 PM EST     3.42 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Mid-Atlantic    EDIT

Wind Forecast for Wilmington, NC (3,6,7,8)
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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.