Friday, January19, 2018 L-36.com


Marine Weather and Tides
Arlington, VA

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 7:21AMSunset 5:16PM Friday January 19, 2018 12:47 AM EST (05:47 UTC) Moonrise 8:56AMMoonset 7:49PM Illumination 6% Phase: Waxing Crescent; Moon at 2 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- 1230 Am Est Fri Jan 19 2018
Overnight..SW winds 5 kt. Waves less than 1 ft.
Fri..SW winds around 5 kt. Waves 1 ft.
Fri night..SW winds 5 kt. Waves less than 1 ft.
Sat..SW winds 5 kt. Waves less than 1 ft.
Sat night..NW winds 5 kt. Waves less than 1 ft.
Sun..S winds around 5 kt. Waves 1 ft.
Sun night..S winds around 5 kt. Waves 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft. Showers likely through the night.
Tue..W winds 5 to 10 kt. Waves 1 ft. A chance of showers through the day.
ANZ500 1230 Am Est Fri Jan 19 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build from the center of the us to the eastern seaboard through this weekend. The next cold front will approach the area Monday.

7 Day Forecast for Marine Location Near Arlington, VA
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location: 38.87, -77.06     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 190148
afdlwx
area forecast discussion
national weather service baltimore md washington dc
848 pm est Thu jan 18 2018

Synopsis
High pressure will build south of the area through the weekend.

A cold front will cross the area early next week.

Near term until 6 am Friday morning
A 1031mb high pressure center resides over the gulf coast
states this evening, extending its northeastern flank over our
region. This expansive area of high pressure is responsible for
clear skies for most locations residing east of the mississippi
river. Winds have been subdued for the last few hours and will
continue to trend light to calm across the much of the area
overnight. Combine this with clear skies, expect prime
radiational cooling conditions tonight. We've already seen some
of our favored radiational cooling locations dip in to the mid
to upper 20s early this evening. With dewpoints in the single
digits to low teens across the area, this leaves plenty of room
for temperatures to bottom out in the mid to upper teens for
most, with locations near our city centers holding in the low to
middle 20s. On going forecast is in good shape with no major
changes needed.

Short term 6 am Friday morning through Saturday night
Warm advection should be underway Friday, with little tangible
weather. Aside from perhaps some high clouds, it will largely be a
temperature forecast. Readings should get into the 40s Friday
(without the winds) and 50s Saturday. Lows will drop into the 20s
Friday night and near freezing Saturday night.

As an upper disturbance tracks along the gulf coast Saturday-
Saturday night, some moisture could spread north with isentropic
lift up the mountains. At this point, there is light QPF (at
best)... So pops are subsequently low (chance). Will need to keep an
eye on temperatures though. Believe that there will be enough warm
advection to preclude freezing rain, but a few GEFS ensemble members
do have subfreezing air just east of where the meager pops will be.

And deterministic output also depict a close call. Pops are only for
the western fringe zones, and are only 20-30%, but did introduce
rain or freezing rain overnight... Just in case.

Long term Sunday through Thursday
High pressure will be near the south carolina coast Sunday, with a
warm front lifting northward to our west. An area of low pressure
will develop along the tail-end of this warm front over the central
plains. The low is expected to move toward the great lakes region
Sunday night through Monday night. With that, the warm front will
bring us a chance for a rain showers along the mason-dixon region
and the appalachian front Sunday night and Monday. The increased
chance for rain showers will be Monday night with a cold front
passage. Temperatures will be above normal Sunday night through
Monday night. High temperatures could reach the 60s Monday ahead
of the cold front.

Rain showers could linger on Tuesday on the back side of the cold
front. Colder and drier air will move in behind the front as well.

Temperatures will be about 10 degrees cooler than the day before due
to frontal passage.

High pressure will regain control of the region with the chilly
january air but plenty of sunshine Wednesday through Thursday.

Aviation 01z Friday through Tuesday
Vfr conditions will dominate heading in to the weekend. Light
winds forecast overnight in to Friday, remaining at 10 knots or
less, residing out of the west to southwest through Saturday
night.

Vfr conditions continue Sunday through midday Monday. MVFR to
briefly ifr conditions possible with rain showers late Monday
and Monday night.

Marine
With a ridge of high pressure building over our region, light
winds will prevail overnight with no headlines expected. Wind flow
will back southwest Friday, and will remain there at 10 kt or
less through Monday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Hts
near term... Bkf
short term... Hts
long term... Klw
aviation... Bkf hts klw
marine... Bkf hts klw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 2 mi48 min SE 1.9 G 1.9 31°F 33°F1020.5 hPa (+0.7)
BSLM2 - Chesapeake Bay, MD 20 mi138 min Calm 24°F 1021 hPa20°F
APAM2 - 8575512 - Annapolis, MD 32 mi48 min 30°F 1019.6 hPa (+0.7)
TPLM2 - Thomas Point, MD 33 mi48 min WSW 1.9 G 1.9 34°F 31°F
FSNM2 37 mi48 min W 8 G 8.9 37°F 1019.1 hPa (+0.4)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi48 min SW 6 G 6 35°F 1019.9 hPa (+0.4)
CPVM2 37 mi48 min 37°F 4°F
BLTM2 - 8574680 - Baltimore, MD 37 mi48 min WSW 1 G 1.9 33°F 33°F1019.3 hPa (+0.4)
NCDV2 38 mi48 min W 1.9 G 2.9 28°F 32°F1020.5 hPa (+1.6)
44062 - Gooses Reef, MD 40 mi38 min W 5.8 G 5.8 34°F 1021 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi48 min W 12 G 13 37°F 1021.4 hPa (+1.2)
TCBM2 - 8573364 - Tolchester Beach, MD 49 mi48 min ESE 2.9 G 2.9 27°F 33°F1020.2 hPa (+0.8)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi56 minS 810.00 miFair30°F23°F75%1020.4 hPa
Camp Springs / Andrews Air Force Base, MD10 mi52 minN 010.00 miFair25°F13°F61%1021 hPa
College Park Airport, MD11 mi71 minN 010.00 miFair23°F17°F77%1020 hPa
Fort Belvoir, VA12 mi52 minN 010.00 miFair22°F14°F71%1021.1 hPa
Gaithersburg - Montgomery County Airport, MD21 mi52 minN 010.00 miFair24°F12°F62%1022.6 hPa
Washington/Dulles International Airport, DC, VA22 mi56 minN 010.00 miFair24°F10°F57%1020 hPa
Fort Meade / Tipton, MD22 mi72 minN 010.00 miFair23°F19°F86%1021 hPa

Wind History from DCA (wind in knots)
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Last 24hrN11
G18
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W11W6NW4W3CalmSW3NW5CalmS8
1 day agoNW10NW10NW12
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2 days agoCalmSE4S4SE4S3SE4SE4SE5S3SE3S3SE3S6S4CalmNE3CalmS4S3CalmCalmNE4N4NW11

Tide / Current Tables for Washington, Potomac River, D.C.
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Washington
Click for Map
Fri -- 04:17 AM EST     -0.15 feet Low Tide
Fri -- 07:23 AM EST     Sunrise
Fri -- 08:55 AM EST     Moonrise
Fri -- 09:30 AM EST     2.41 feet High Tide
Fri -- 04:14 PM EST     -0.13 feet Low Tide
Fri -- 05:14 PM EST     Sunset
Fri -- 07:49 PM EST     Moonset
Fri -- 09:37 PM EST     2.65 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.50.90.40.1-0.1-00.51.42.12.42.42.11.50.90.40-0.1-00.51.42.22.62.62.4

Tide / Current Tables for Bladensburg, Anacostia River, Maryland
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Bladensburg
Click for Map
Fri -- 04:42 AM EST     -0.17 feet Low Tide
Fri -- 07:23 AM EST     Sunrise
Fri -- 08:54 AM EST     Moonrise
Fri -- 10:01 AM EST     2.55 feet High Tide
Fri -- 04:39 PM EST     -0.15 feet Low Tide
Fri -- 05:14 PM EST     Sunset
Fri -- 07:48 PM EST     Moonset
Fri -- 10:08 PM EST     2.81 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.91.30.70.2-0.1-0.20.211.92.42.62.41.91.30.70.2-0.1-0.10.211.92.62.82.7

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 (0,6,7,8)
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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.