Tuesday, April24, 2018 L-36.com

Marine Weather and Tides
Vienna, MD

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 6:11AMSunset 7:49PM Tuesday April 24, 2018 8:42 PM EDT (00:42 UTC) Moonrise 1:15PMMoonset 2:22AM Illumination 72% Phase: Waxing Gibbous; Moon at 10 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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ANZ543 Tangier Sound And The Inland Waters Surrounding Bloodsworth Island- 751 Pm Edt Tue Apr 24 2018
.small craft advisory in effect until 4 am edt Wednesday...
Tonight..E winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. Rain. Patchy fog. Vsby 1 to 3 nm.
Wed..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers. Patchy fog. Vsby 1 to 3 nm.
Wed night..NW winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers.
Thu..W winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft.
Thu night..S winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Fri..SE winds 5 to 10 kt. Waves 1 ft. Showers likely.
Fri night..SW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers.
Sat..NW winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers in the morning.
Sun..NW winds 10 to 15 kt. Waves 1 to 2 ft.
ANZ500 751 Pm Edt Tue Apr 24 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will move northward from the carolinas tonight before passing overhead Wednesday. High pressure will then move near the area Thursday. Another low pressure system may affect the waters by overnight Thursday into Friday. A cold front will pass through the waters Saturday and high pressure will return for Sunday. Small craft advisories may be needed Thursday.

7 Day Forecast for Marine Location Near Vienna, MD
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location: 38.48, -75.82     debug

Area Discussion for - Wakefield, VA
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Fxus61 kakq 242337
area forecast discussion
national weather service wakefield va
737 pm edt Tue apr 24 2018

Low pressure tracks across virginia tonight... Then will be slow
to move away from the coast Wednesday. Weak high pressure returns
by Thursday.

Near term through Wednesday
Evening update as of 800 pm edt Tuesday...

latest msas has low pressure centered along the nc sc border SE of
clt. The steadiest and heaviest rainfall conts to lift NE with the
radar beginning to fill back in with rain as the local area remains
on the cooler side of the system. Thus, made several changes to the
grids early this evening based on the latest radar trends and sfc obs.

Expect periods of rain for the rest of the evening hours.

Forecast gets a bit more interesting later tonight as most of the high
res data suggests an area of mdt to psbl hvy rainfall along and east
of the ches bay between 04-10z as the low pressure system and associated
warm front lifts north. Thus, went ahead and beefed up the grids along
the coast for this ptntl, but held off on any thunder as it appears most
of the convection stays offshore. Otw, rain or shwrs continue across the
piedmont through the night. Patchy drizzle and areas of fog across the
piedmont as the column remains nearly saturated. Lows in the 50s to near
60 se.

Afternoon discussion as of 4 pm edt Tuesday
On Wednesday, the initial surface low and warm front will lift
north of the area, but the upper level low will settle over the
area. This will allow for some cooler air aloft to settle over
the area with more showers developing in the afternoon. Could
potentially see some thunder if there is enough heating ahead of
the upper lows arrival. Right now, it looks like it will stay a
little too cloudy, but it can't be ruled out especially east of
i-95. Guidance is pretty spread on temps tomorrow with the met
much cooler than the mav. Have generally gone in between with
temps in the mid 60s to the lower 70s.

Short term Wednesday night through Friday
As of 400 pm edt Tuesday...

the upper low will exit the region early Wed night taking any
chance of rain with it. Show a gradual decrease in pops from sw
to NE during the evening. Behind this system the newer model
runs are not as aggressive in pushing the drier air with the
next sfc high into the region. This is more like what the gfs
had been depicting in previous runs. As a result have kept the
clouds a little longer and also raised overnight lows by a few
degrees getting closer to guidance in the low to mid 50s.

With the front not pushing as far south on Wed night into
Thursday and stalling more along the nc va border expect to see
a little less sunshine especially across SRN va NRN nc. The next
surface wave is now progged to arrive sooner on Thursday night.

So expect to see clouds on the increase during the afternoon and
could even see some light pcpn in the piedmont counties around
sunset. At this point held off on adding late afternoon pcpn but
will need to see how quick the overrunning develops. For highs
on Thursday did have readings back into the low to mid 70s with
the best warming in the eastern portion of the cwa.

With the next wave arriving sooner have sped up pops on Thursday
night and Friday morning. The best chance for rain looks to be
in the piedmont counties so have increased pops to 50 for now
and they may need to be increased. Once the surface low lifts
through the area by Friday morning should see the chances for
rain diminish by later morning early afternoon. For
temperatures, kept readings a little warmer thurs night with the
sw flow and clouds. For highs on Friday did keep highs in the
low to mid 70s as the return of the Sun in the afternoon should
allow for temperatures to warm especially ahead of the cold
front for Saturday.

Long term Friday night through Tuesday
As of 400 pm edt Tuesday...

gfs ECMWF differ early in this period with the GFS showing the last
in a series of S W trofs rounding the base of the long wave trof
late Fri night with it moving off the sern coast Sat ahead of a weak
frontal passage. Meanwhile, the ECMWF is drier with little if any
support for pcpn even with the frontal passage sat. A model blend
results in low chc shwrs across the sern zones late Fri night and
sat keeping the rest of the local area dry for now. Lows Fri nite
upr 40s-mid 50s. Highs Sat upr 60s-mid 70s, cooler at the beaches.

After that, some delightful spring weather on tap early next week as
high pressure builds SE from the gt lakes region Sun to a position
over the local area Mon then off the mid atlantic coast tue. Cool to
start then a warming trend. Highs Sun generally in the 60s. Lows in
the 40s to near 50 se. Highs Mon upr 60s-lwr 70s. Lows upr 40s-lwr
50s. Highs Tue 75-80.

Aviation 00z Wednesday through Sunday
As of 8 pm edt Tuesday...

low pressure will track NE across virginia tonight. The steadiest
and heaviest rain has pushed north of the local area with widespread
ifr CIGS and lower vsbys in both rain fog continues thru the night
and into Wed morning. High res data even shows an enhanced band of
heavier shwrs (psbl thunder along the coast or just offshore) as the
associated warm front lifts northward along the coast btwn 04-10z.

Gusty SE wind 15-25 kts along the coast slowly diminish as the low
tracks ne. Ptchy fog west of the bay with some drizzle across the
piedmont after midnite.

Upr level low then crosses the region Wed with the best support for
shwrs east of i95. Could also see an isltd TSTM if enuf heating occurs.

Conditions finally inprove by thurs as high pressure returns.


another area of low pressure will impact the region Thursday night sct
showers and MVFR conditions. A second cold front swings across the the
region on Saturday withVFR conditions returning on Sunday as high pres
builds into the area.

As of 300 pm edt Tuesday...

broad low pressure is situated over upstate sc this afternoon.

Meanwhile, high pressure is centered well off the new england coast.

The resultant pressure gradient between these two features is causing
east to southeast winds of 15-25 kt with gust up to 30 kt that will
last into this evening. Seas will continue to build to 6-10 ft by
this evening; waves reaching 3-5 ft, except up to 6 ft at the mouth
of the bay. Winds waves seas diminish subside overnight into
Wednesday morning as the pressure gradient relaxes. Scas remain in
effect for all waters through late evening, with scas for the rivers
coming down at 11 pm tue, and for the bay sound at 1 am wed. Scas
have been extended into Thursday morning for the southern coastal
waters and Thursday afternoon for the northern coastal waters due to
seas remaining elevated. A high surf advisory for obx currituck will
also remain in effect until 5 am Wednesday for nearshore waves of 8-
10 feet.

Broad low pressure lifts north through the region during Wednesday
with ssw winds 5-15kt becoming NW in the wake of the low Wed night
into thurs morning. After a brief lull midweek the next low pressure
system then impacts the region Friday Saturday.

Akq watches warnings advisories
Md... None.

Nc... High surf advisory until 5 am edt Wednesday for ncz102.

Va... None.

Marine... Small craft advisory until 11 pm edt this evening for

Small craft advisory until noon edt Wednesday for anz634.

Small craft advisory until 1 am edt Wednesday for anz630>633.

Small craft advisory until 6 pm edt Thursday for anz650-652-

Small craft advisory until 10 am edt Thursday for anz656-658.

Synopsis... Ess mpr
near term... Mpr ess
short term... Ess
long term... Mpr
aviation... Mpr
marine... Jdm

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CA2 - 8571892 - Cambridge, MD 15 mi42 min 55°F 56°F1018.5 hPa (-1.5)
BISM2 - 8571421 - Bishops Head, MD 21 mi42 min E 13 G 18 56°F 56°F1016.8 hPa (-1.9)
COVM2 - 8577018 - Cove Point LNG Pier, MD 30 mi42 min E 14 G 18 54°F 1017.8 hPa (-1.3)
44062 - Gooses Reef, MD 32 mi32 min E 12 G 14 54°F 1017.7 hPa
SLIM2 - 8577330 - Solomons Island, MD 35 mi42 min ENE 15 G 19 54°F 53°F1016.2 hPa (-1.6)
OCIM2 - 8570283 - Ocean City Inlet, MD 40 mi42 min ESE 8.9 G 12 52°F 51°F1018.9 hPa (-1.7)
44042 - Potomac, MD 41 mi32 min ESE 12 G 16 55°F 1017.1 hPa
LWSD1 - 8557380 - Lewes, DE 43 mi42 min ESE 12 G 19 53°F 52°F1019 hPa (-1.6)
PPTM2 - 8578240 - Piney Point, MD 45 mi42 min E 15 G 18
CPVM2 47 mi48 min 54°F 53°F
DRSD1 - Delaware Reserve, DE 47 mi132 min E 5.1 55°F 1020 hPa52°F
LWTV2 - 8635750 - Lewisetta, VA 48 mi42 min ESE 14 G 16 54°F 56°F1015.7 hPa (-1.7)
APAM2 - 8575512 - Annapolis, MD 49 mi42 min 54°F 1018.1 hPa (-0.8)

Wind History for Cambridge, MD
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Cambridge-Dorchester Airport, MD12 mi67 minENE 6 G 112.50 miFog/Mist55°F53°F94%1017.9 hPa
Salisbury, Salisbury-Ocean City Wicomico County Regional Airport, MD20 mi48 minE 125.00 miLight Rain Fog/Mist55°F53°F93%1017.8 hPa

Wind History from CGE (wind in knots)
Last 24hrSE6E6SE4E7E6SE6E8E6E7E7E8E8E10E11E17
1 day agoE4SE6E4E3CalmS4SE3SE4CalmNE4CalmCalmCalm4E4E9S8S7
2 days agoCalmCalmCalmCalmCalmCalmSE3CalmCalmCalmCalmNE3NE5CalmNW4CalmS4

Tide / Current Tables for Vienna, Nanticoke River, Chesapeake Bay, Maryland
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Tue -- 12:16 AM EDT     2.14 feet High Tide
Tue -- 03:22 AM EDT     Moonset
Tue -- 06:14 AM EDT     Sunrise
Tue -- 06:30 AM EDT     0.13 feet Low Tide
Tue -- 12:49 PM EDT     2.35 feet High Tide
Tue -- 02:14 PM EDT     Moonrise
Tue -- 07:19 PM EDT     0.12 feet Low Tide
Tue -- 07:48 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Salisbury, Maryland (2 miles below) Current
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Tue -- 02:13 AM EDT     -0.74 knots Max Ebb
Tue -- 03:21 AM EDT     Moonset
Tue -- 05:26 AM EDT     0.00 knots Slack
Tue -- 06:14 AM EDT     Sunrise
Tue -- 08:23 AM EDT     0.55 knots Max Flood
Tue -- 11:46 AM EDT     -0.00 knots Slack
Tue -- 02:14 PM EDT     Moonrise
Tue -- 03:16 PM EDT     -0.86 knots Max Ebb
Tue -- 06:37 PM EDT     0.00 knots Slack
Tue -- 07:47 PM EDT     Sunset
Tue -- 09:29 PM EDT     0.53 knots Max Flood
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 Mid-Atlantic    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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Wakefield, VA (20,4,5,8)
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Ground Weather Radar Station Dover AFB, DE
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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 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.