Monday, April23, 2018

Marine Weather and Tides
Red Hill, SC

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 6:33AMSunset 7:54PM Monday April 23, 2018 11:00 PM EDT (03:00 UTC) Moonrise 12:30PMMoonset 1:42AM Illumination 63% Phase: Waxing Gibbous; Moon at 9 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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AMZ254 Coastal Waters From Little River Inlet To Murrells Inlet Sc Out 20 Nm- 830 Pm Edt Mon Apr 23 2018
.gale warning in effect through Tuesday morning...
Overnight..SE winds 25 to 35 kt with gusts up to 40 kt. Seas 9 to 12 ft, building to 10 to 12 ft. Isolated tstms. Widespread showers.
Tue..S winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 6 to 9 ft, subsiding to 5 to 7 ft in the afternoon. Showers with a slight chance of tstms.
Tue night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft.
Wed..SW winds 10 kt. Seas 3 to 5 ft.
Wed night..SW winds 10 kt, becoming nw after midnight. Seas 3 to 5 ft, subsiding to 2 to 4 ft after midnight.
Thu..N winds 10 kt, becoming se in the afternoon. Seas 3 ft.
Thu night..SW winds 10 kt. Seas 2 to 3 ft. A chance of showers.
Fri..W winds 10 kt. Seas 2 ft.
Sat..W winds 10 kt. Seas 2 to 3 ft, then 1 to 2 ft. Winds and seas higher in and near tstms.
AMZ200 830 Pm Edt Mon Apr 23 2018
Synopsis for coastal waters from surf city north carolina to south santee river south carolina out to 20 nautical miles.. A gale warning is in effect. Widespread poor visibility expected overnight into Tuesday due to showers and a few Thunderstorms. A complex storm system will move across the area overnight and Tuesday before moving slowly away from the region on Wednesday. A weak cold front will move across the waters and offshore early Thursday, and then possibly another cold front Saturday.

7 Day Forecast for Marine Location Near Red Hill, SC
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location: 33.75, -79.07     debug

Area Discussion for - Wilmington, NC
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Fxus62 kilm 240201
area forecast discussion
national weather service wilmington nc
1001 pm edt Mon apr 23 2018

A slow moving storm system will bring wet weather into Tuesday,
along with windy conditions, dangerous surf, and coastal
flooding. Easing winds and a warming trend will follow Tuesday
and on Wednesday in the wake of this system. Low pressure
emerging from the gulf states will bring rain chances Thursday
into Friday. Drying and seasonable temperatures are expected
Saturday and into early next week.

Near term through Tuesday
As of 900 pm Monday... A wind advisory along the coast remains
in effect through 5 am. Several beach coastal hazards remain in
effect overnight and into Tue as well.

The low level jet will increase to 50+ kt down to 800 ft above
the ground overnight. The strongest winds are expected within a
few hours either side of 1 am, but may linger across the cape
fear area until mid morning tue. These strong onshore winds will
help focus moisture north of a warm front, increasing the very
moist isentropic upglide. Also, given the strength of these
winds just off the surface, we expect surface wind gusts to 35
to 40 mph, strongest along the coast with the beaches perhaps
recording a few wind gusts to 45 mph.

Bowling ball type upper low clearly evident on goes-e WV imagery
across the tn vly is above an occluded surface low. An occluded
front extends from the low towards secondary low-development in
ga, from which a triple point exists with a warm front and cold
front into the atlantic ocean and gulf of mexico, respectively.

Ahead of this warm front, moisture is pooling and increasing
across the atlantic and cloud tops continue to cool in moisture
plume just offshore. As the flow becomes strongly onshore and
convergence becomes maximized, a period of potentially very
heavy rainfall is likely as the plume becomes directed toward
the carolinas. Locally, the setup looks similar to october,
2015, of course that was a 4 day event and this will last 12

As a warm front lifts northward, moisture will surge into the
carolinas in response to a strengthening gradient driving better
moist advection onshore, and an anomalously strong LLJ of 50+
kt below 850mb surging pwats towards 1.7 inches. These winds are
forecast to reach nearly 4 standard deviations above the mean,
which when combined with +2 sigma pwat, and warm cloud depth of
over 3km suggest an environment which will support very heavy
rainfall. Additionally, strong diffluence, both in the mid
levels, thanks to the closed nature of the low to the west, and
within the lfq of an upper jet, strong fgen within the 850mb-
700mb layer along the warm front, and low-level convergence both
along the front and due to frictional effects onshore, help
drive lift and strong uvvs despite weak to no instability. As
the warm front pivots NE overnight, all of these other
ingredients will accompany this motion, and it is expected that
a band of very heavy rainfall will lift SW to NE across the cwa
overnight. While lack of instability is a mitigating factor, the
other parameters all point towards widespread 1-3" of rainfall
with locally higher amounts, especially closer to the coast.

12-hr FFG guidance is 5-6", so no flash flood watch is needed
and any minor flooding that does occur will be of the low-lying
and poor drainage type.

The main axis of rainfall will lift NE out of the area by late
morning, and the region will briefly be within the warm sector ahead
of Tuesday's cold front which will lift NE through the afternoon.

Guidance is hinting that enough forcing and residual moisture
will re-spawn some showers and maybe a TSTM Tuesday afternoon,
but very dry air above 700mb by that time will limit the overall
coverage and threat. By Tuesday evening the rainfall should be
ending across the cwa. Winds will ease slowly on Tuesday, but
will remain gusty through the aftn.

Temps will not change much through the night and lows are
expected to be in the upper 50s and lower 60s. Increasing
sunshine during Tuesday and the arrival of the aftn warm sector
will drive highs more typical of late april, into the mid 70s
away from the coast.

Short term Tuesday night through Wednesday night
As of 300 pm Monday... Upper level low pressure across the southern
appalachians Tuesday night will open up and lift northeastward
Wednesday as a pair of strong shortwaves approach from the north and
west. Surface low pressure will move northeastward and away from the
area in tandem with the weakening upper low, allowing sunshine to
return on Wednesday. Highs on Wednesday should reach the upper 70s
to near 80 degrees away from the beaches. These warm temperatures in
combination with dewpoints hanging in the 50s should develop a
substantial field of cumulus clouds during the day.

While across central and northern north carolina colder mid-level
temperatures should allow these cumulus to grow deeper and produce
showers, a subsidence inversion between 7000-10000 feet agl that
becomes stronger the farther south you go should prevent showers
from developing locally. I've got 10% pops across lumberton,
elizabethtown and wilmington during the day Wednesday but honestly
expect most convective showers to remain farther north.

As the departing surface low deepens as it moves from nj into new
england Wednesday night, a cold front will get a renewed shove
southward and should move through the carolinas and off the coast
overnight. The atmosphere should remain stable for this frontal
passage with insufficient moisture for any showers.

Long term Thursday through Monday
As of 300 pm Monday... Another area of low pressure may bring
showers to the area Thursday into Friday. Otherwise, the long
term looks dry with temperatures near or slightly below seasonal
normals. Normals for this time of year run mid to upper 70s by
day and mid 50s overnight.

Aviation 00z Tuesday through Saturday
As of 00z... Flight conditions will deteriorate with ifr likely.

Very heavy rain and possibly an isolated thunderstorm will occur
generally through 06-09z, possibly through 12z at kilm klbt.

Thunderstorms too isolated to mention in taf. Easterly winds will be
quite strong with gusts 25 kt possible. As winds veer to the
southeast overnight, wind speeds are expected to decrease. Southeast
winds should become south as Tue morning progresses. Ifr CIGS should
improve toVFR 16-18z.

Extended outlook... Tempo MVFR Thu night through Fri night. Otherwise

Near term through Tuesday ...

as of 900 pm Monday... A gale warning is in effect. Dangerous
marine conditions overnight into Tue as strong low pressure and
its associated frontal system impacts the waters. Surface low
across ga will lift NE overnight into Tuesday, while high
pressure near new england slowly retreats. The gradient between
these two features will produce a pinched gradient, resulting in
wind speeds of 20 to 30 kt with gusts to around 40 kt. Seas will
peak in the 8 to 12 ft range and as high as 13 or 14 ft. The
wind direction overnight will be se. Widespread showers and a
few thunderstorms into Tue morning will result in poor visibility
due to heavy rain.

During Tuesday conditions will slowly improve with winds
veering from SE to SW by the end of the period as the cold front
lifts across the waters. During this wind shift speeds will
gradually lower as well, becoming 15-20 kt with higher gusts. A
small craft advisory will be required once the gale has eased.

Seas will be subsiding during tue, lastly across the northern
waters. Seas may not drop below 6 ft until late Tue night or on
wed. The wave period will remain around 9 seconds.

Short term Tuesday night through Wednesday night ...

as of 300 pm Monday... Low pressure centered near raleigh Tuesday
evening should drift northeastward across the chesapeake bay
Wednesday morning, then into new england Wednesday night. A cold
front behind the low will initially be very slow to move south, but
should get a renewed kick Wednesday night as the low deepens.

Compared to winds coming up tonight and Tuesday, winds Tuesday night
through Wednesday night should be a piece of cake: 15 knots from the
southwest Tuesday evening, then around 15 knots again with the
seabreeze on Wednesday afternoon. Wind directions should veer
northerly by late Wednesday night as the cold front moves across the

Despite diminishing wind speeds, large seas will remain with us
through at least Wednesday morning, a consequence of the storminess
along the southeast coast today through Tuesday. Nine-second
southeast swell as large as 8 feet will move through the coastal
waters Tuesday evening before diminishing to 3-6 feet Wednesday
morning. We'll likely need to keep a small craft advisory running
through Wednesday morning.

Long term Thursday through Saturday ...

as of 300 pm Monday... Expect shifting winds over the waters
Thursday and Thursday night with low pressure moving through.

Ne winds Thu am will become SE by Thu night and SW on Friday.

Speeds currently look to run about 15 kt but this could change
depending on how this next low progresses. W to SW winds of
10 to 15 kt are expected for the remainder of the period. Seas
of 3 to 4 ft Thu will subside to 2 to 3 ft Friday and Saturday.

Tides coastal flooding
As of 900 pm Monday... A coastal flood advisory is in effect for
minor coastal flooding around the time of high tide, both at
the beaches and for portions of the lower CAPE fear river to
include downtown wilmington. Given the duration and overnight
increase in strength of the onshore winds as well as the
increasing rainfall rates, decided to go above the available
tidal predictions. We are expecting tidal departures on the
order of 1 to 1.5 ft and as much as 2 ft. Departures of this
magnitude would bring a brief period of minor coastal flooding
to the beaches around 300 am and downtown wilmington around 530
am. Significant beach erosion is possible with the overnight
high tide as well.

Ilm watches warnings advisories
Sc... Wind advisory until 5 am edt Tuesday for scz054>056-058-059.

Coastal flood advisory from 1 am to 5 am edt Tuesday for

High rip current risk until 6 am edt Tuesday for scz054-056.

Nc... Wind advisory until 5 am edt Tuesday for ncz105>110.

High rip current risk through Tuesday evening for ncz106-108-

Coastal flood advisory from 1 am to 5 am edt Tuesday for

Coastal flood advisory from 4 am to 8 am edt Tuesday for

Beach hazards statement until 6 am edt Tuesday for ncz110.

Marine... Gale warning until noon edt Tuesday for amz250-252-254-256.

Near term... Rjd jdw
short term... Tra
long term... Ran
aviation... Mrr
tides coastal flooding... Rjd

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
MROS1 - 8661070 - Springmaid Pier, SC 10 mi42 min 1020.8 hPa
NIWS1 - North Inlet-Winyah Bay Reserve, SC 28 mi75 min ESE 21 64°F 1017 hPa63°F
SSBN7 32 mi98 min 6 ft
41024 - Sunset Nearshore (SUN 2) 32 mi52 min ESE 21 G 31 64°F 62°F1018.7 hPa

Wind History for Springmaid Pier, SC
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Conway Horry County Airport, SC6 mi65 minE 13 G 187.00 miLight Rain61°F60°F100%1017.9 hPa
Myrtle Beach Air Force Base, SC8 mi64 minE 16 G 207.00 miLight Rain64°F61°F90%1018.8 hPa
North Myrtle Beach Grand Strand Airport, SC19 mi67 minE 17 G 2710.00 miOvercast64°F60°F87%1019 hPa

Wind History from HYW (wind in knots)
Last 24hrE4E5E5E6CalmE4E5NE5E5E6E8
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmNE3E4E5E7SE7SE9
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmNE4NE5E6

Tide / Current Tables for Keysfield, Waccamaw River, South Carolina
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Mon -- 02:40 AM EDT     0.09 feet Low Tide
Mon -- 02:41 AM EDT     Moonset
Mon -- 06:36 AM EDT     Sunrise
Mon -- 08:48 AM EDT     1.60 feet High Tide
Mon -- 01:30 PM EDT     Moonrise
Mon -- 03:32 PM EDT     0.18 feet Low Tide
Mon -- 07:53 PM EDT     Sunset
Mon -- 09:33 PM EDT     1.40 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Conway, RR. bridge, Waccamaw River, South Carolina
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Mon -- 02:41 AM EDT     Moonset
Mon -- 03:48 AM EDT     0.08 feet Low Tide
Mon -- 06:35 AM EDT     Sunrise
Mon -- 09:58 AM EDT     1.43 feet High Tide
Mon -- 01:30 PM EDT     Moonrise
Mon -- 04:40 PM EDT     0.15 feet Low Tide
Mon -- 07:53 PM EDT     Sunset
Mon -- 10:43 PM EDT     1.25 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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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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Wilmington, NC (23,6,7,8)
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Ground Weather Radar Station Wilmington, NC
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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.