Thursday, November23, 2017 L-36.com


Marine Weather and Tides
Potomac Heights, MD

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 6:59AMSunset 4:51PM Thursday November 23, 2017 9:52 AM EST (14:52 UTC) Moonrise 11:00AMMoonset 9:14PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 932 Am Est Thu Nov 23 2017
Rest of today..W winds around 5 kt. Waves 1 ft.
Tonight..SW winds around 5 kt. Waves 1 ft.
Fri..S winds around 5 kt. Waves 1 ft.
Fri night..S winds 5 kt. Waves less than 1 ft.
Sat..W winds around 5 kt. Waves 1 ft.
Sat night..NW winds 5 to 10 kt. Waves 1 ft.
Sun..NW winds 5 to 10 kt. Waves 1 ft.
Mon..S winds around 5 kt. Waves 1 ft.
ANZ500 932 Am Est Thu Nov 23 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain over the waters through Friday night. A cold front will approach early Saturday before crossing Saturday night. High pressure will return for Sunday and Monday. A small craft advisory will likely be issued for Saturday night and Sunday.

7 Day Forecast for Marine Location Near Potomac Heights, MD
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location: 38.62, -77.13     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 231430
afdlwx
area forecast discussion
national weather service baltimore md washington dc
930 am est Thu nov 23 2017

Synopsis
High pressure will build over the area through Friday. Another
cold front will approach overnight Friday into Saturday before
passing through Saturday night. High pressure returns for Sunday
and Monday before moving offshore Tuesday.

Near term through tonight
Temperatures are starting to rebound under sunny skies following
a night of cold advection and light winds leading to chilly
temperatures. Shenandoah airport dropped to 16; new market and
petersburg both fell to 17. Everywhere fell to or below
freezing except downtown baltimore and coastal saint mary's
county.

9 am temperatures ranged from 24 at shenandoah and petersburg to
39 at pax river. Winds have diminished and the pesky low clouds
in the hagerstown-frederick corridor are finally breaking. High
clouds remain east of a fredericksburg to annapolis line but are
edging eastward.

High pressure will remain over the area all day today, leading
to light and variable winds and highs in the 40s. The sunny
sky will be peppered with some mid-level clouds this afternoon,
especially closer to the mason-dixon line, as a weak upper level
disturbance comes through the dry high pressure airmass
overhead.

What few clouds there are will dissipate in the evening, leaving
generally clear skies. However, dewpoints should come up a few
degrees, so despite calm winds and decoupling, lows probably end
up a few degrees warmer than this morning. Will lean on the
cool side of guidance given what happened this morning.

Short term Friday through Saturday night
Friday and Friday night will have seasonable fair weather under
the continued influence of high pressure, with very light
winds.

Saturday will start out with partly sunny skies, but quickly
become overcast as cold front moves through the region,
bringing chance of rain showers, with diminishing chances the
further east as deep westerly winds will promote downsloping
and associated drying. Most likely scenario brings scattered
showers shenandoah valley and points west, with sprinkles at
higher elevations along the blue ridge, and mid-deck along and
east of interstate 95. Cold air advection with strong winds
behind the front for Saturday night, with snow showers
developing in favored upslope regions.

Long term Sunday through Wednesday
High pressure will build overhead Sunday through
Monday... Bringing dry and seasonably chilly conditions. The high
will move offshore Tuesday and a southwest flow around the
departing high will usher in milder conditions... And it will
remain dry.

A cold front will approach the area Tuesday night and it may
pass through Wednesday or Thursday. Confidence in how far south
the front makes it is low at this time due to divergence in the
long range guidance. Leaned toward the superblend for
temperature forecasts during this time... Which keeps temps near
or above climo. This makes sense this far out since there will
be an anomalous subtropical ridge over the southeastern
conus... And this would favor the front being slower and weaker.

Aviation 14z Thursday through Monday
Vfr for all terminals through 36 hours. Gusty winds develop
Saturday night behind cold front.

Vfr conditions are expected Sunday through Tuesday as high
pressure controls the weather pattern.

Marine
Winds have decreased on the bay and the SCA was cancelled early.

Light winds should continue through Saturday. Small craft is
expected to return Saturday night and continue through Sunday.

High pressure will build overhead Sunday through Monday. A small
craft advisory may be needed for portions of the waters Sunday
ahead of the building high.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Bjl
near term... Je
short term... Lee
long term... Bjl
aviation... Lee bjl
marine... Je lee bjl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 18 mi52 min NW 5.1 G 7 35°F 47°F1023.2 hPa (+0.7)
NCDV2 21 mi52 min N 4.1 G 6 37°F 49°F1022.2 hPa (+0.9)
BSLM2 - Chesapeake Bay, MD 25 mi82 min Calm 28°F 1023 hPa27°F
44062 - Gooses Reef, MD 38 mi42 min NNW 9.7 G 14 38°F 1023.2 hPa
SLIM2 - 8577330 - Solomons Island, MD 41 mi52 min NNW 8 G 14 38°F 52°F1022.3 hPa (+1.1)
TPLM2 - Thomas Point, MD 42 mi52 min NW 8.9 G 9.9 35°F 51°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 42 mi52 min N 15 G 19 37°F 1023.1 hPa (+1.2)
44063 - Annapolis 43 mi42 min N 7.8 G 9.7 36°F 1022.5 hPa
APAM2 - 8575512 - Annapolis, MD 43 mi52 min 35°F 1022.1 hPa (+0.8)
PPTM2 - 8578240 - Piney Point, MD 46 mi52 min N 13 G 17
CPVM2 47 mi52 min 36°F 24°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA8 mi56 minN 010.00 miFair28°F24°F86%1023.7 hPa
Quantico Marine Corps Airfield - Turner Field, VA12 mi1.9 hrsNW 5 miFair31°F26°F82%1023.9 hPa
Washington/Reagan National Airport, DC, VA17 mi60 minNNW 710.00 miPartly Cloudy35°F21°F59%1023.1 hPa
Camp Springs / Andrews Air Force Base, MD20 mi56 minN 010.00 miFair33°F25°F73%1023.3 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA22 mi56 minN 010.00 miFair30°F27°F88%1024.5 hPa
Stafford, Stafford Regional Airport, VA23 mi77 minN 010.00 miFair25°F24°F100%1025.1 hPa

Wind History from DAA (wind in knots)
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NW9NW8NW8
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NW10NW6NW8NW5CalmCalmCalmCalmCalmCalmCalmCalmCalm
1 day agoS4S8S7
G16
S9S9S6S8S5S6S3S3S4S4S3CalmCalmCalmCalmCalmSE4CalmSE3CalmNW7
2 days agoCalmCalmW10
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SW6W7W7W5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS4S4SW3

Tide / Current Tables for Glymont, Potomac River, Maryland
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Glymont
Click for Map
Thu -- 04:32 AM EST     0.12 feet Low Tide
Thu -- 06:59 AM EST     Sunrise
Thu -- 10:15 AM EST     1.62 feet High Tide
Thu -- 10:59 AM EST     Moonrise
Thu -- 04:13 PM EST     0.12 feet Low Tide
Thu -- 04:50 PM EST     Sunset
Thu -- 09:13 PM EST     Moonset
Thu -- 10:14 PM EST     1.81 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.30.90.50.30.10.10.30.81.21.51.61.61.30.90.50.20.10.20.40.81.31.71.81.7

Tide / Current Tables for Mount Vernon, Virginia
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Mount Vernon
Click for Map
Thu -- 05:08 AM EST     0.18 feet Low Tide
Thu -- 06:59 AM EST     Sunrise
Thu -- 10:48 AM EST     1.96 feet High Tide
Thu -- 10:59 AM EST     Moonrise
Thu -- 04:49 PM EST     0.18 feet Low Tide
Thu -- 04:49 PM EST     Sunset
Thu -- 09:13 PM EST     Moonset
Thu -- 10:47 PM EST     2.17 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.40.90.50.30.20.30.61.21.71.921.81.40.90.50.20.20.30.61.21.82.12.2

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

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Baltimore, MD/Washington (9,2,3,4)
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Ground Weather Radar Station Sterling, VA
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weather_mapweather_map weather_map

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Disclaimer:
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.