Monday, June26, 2017 L-36.com


Marine Weather and Tides
Annandale, 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 5:44AMSunset 8:39PM Monday June 26, 2017 1:20 PM EDT (17:20 UTC) Moonrise 7:38AMMoonset 9:54PM Illumination 7% Phase: Waxing Crescent; Moon at 3 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- 1031 Am Edt Mon Jun 26 2017
Rest of today..W winds 10 to 15 kt. Waves 1 ft.
Tonight..NW winds 5 to 10 kt. Waves 1 ft.
Tue..W winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Tue night..NW winds 5 to 10 kt. Waves 1 ft.
Wed..W winds 5 kt. Waves less than 1 ft.
Wed night..S winds 5 kt. Waves less than 1 ft.
Thu..SW winds 5 to 10 kt. Waves 1 ft.
Fri..SW winds 5 kt. Waves less than 1 ft. A chance of tstms. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1031 Am Edt Mon Jun 26 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build west of the area through Tuesday. A weak cold front will cross the waters Tuesday. High pressure will move over the area Wednesday before shifting offshore Thursday. Small craft advisory conditions are possible over portions of the waters Tuesday and again Thursday.

7 Day Forecast for Marine Location Near Annandale, VA
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location: 38.83, -77.22     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 261435 aaa
afdlwx
area forecast discussion... Updated
national weather service baltimore md washington dc
1035 am edt Mon jun 26 2017

Synopsis
High pressure will build west of the area through Tuesday. A
cold front will cross the region Tuesday. High pressure will
move over the region Wednesday and settle offshore late in the
week.

Near term through tonight
Weak high pressure will remain in control of the region today.

Very dry air mass per 12z iad sounding will inhibit any shower
development today or tonight.

Short term Tuesday through Wednesday night
The upper trough axis crosses the area Tuesday night. This should
provide enough forcing for widely scattered showers with isolated
afternoon thunderstorms. Otherwise, expect the coolest day in three
weeks with MAX temps in the upper 70s.

Return southerly flow that begins late Wednesday behind the surface
high.

Long term Thursday through Sunday
After a cool (for late june) period high pressure moves offshore
Thursday and the heat and humidity return through the weekend.

Still, not extreme heat: upper 80s around 90.

It is hard to pin down the exact timing chance of precipitation
several days in advance, but for now it looks like Saturday
night Sunday would have the best chances as a shortwave tracks
north of the forecast area.

4th of july is still beyond the scope of this forecast, but for
now neither the GFS or euro shows anything too dangerous -
euro's upper pattern is high zonal while GFS has a weak upper
trough running down the eastern seaboard.

Aviation 15z Monday through Friday
Vfr prevails through the week as high pressure slowly builds from
the west. Passing shower isolated thunderstorm Tuesday ahead of a
cold front.

Vfr conditions expected Thursday and Friday.

Marine
Nwly flow may gust to around 20 knots this morning, but confidence
is low, so winds were capped at 15 knots. High pressure slowly
builds through Wednesday. Return southerly flow begins Wednesday
night as the high shifts to bermuda.

Winds expected to remain below SCA values Thursday Friday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until noon edt today for anz531>534-537-
539>541-543.

Update... Lfr
products... Baj woody!


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44061 - Upper Potomac, MD 10 mi63 min SW 7.8 G 12 74°F 81°F1019.2 hPa
WASD2 - 8594900 - Washington, DC 11 mi51 min WNW 8 G 9.9 77°F 82°F1018 hPa
BSLM2 - Chesapeake Bay, MD 27 mi111 min NNW 5.1 76°F 1018 hPa48°F
NCDV2 37 mi51 min S 2.9 G 6 78°F 79°F1017.6 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi51 min 81°F 1017.8 hPa
TPLM2 - Thomas Point, MD 42 mi81 min WNW 14 G 16 76°F 78°F
44063 - Annapolis 42 mi41 min NW 12 G 16 76°F 1018.2 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 45 mi51 min W 8.9 G 12 75°F 1017.9 hPa
BLTM2 - 8574680 - Baltimore, MD 45 mi51 min NW 7 G 12 76°F 79°F1017.7 hPa
CPVM2 46 mi51 min 78°F 49°F
FSNM2 46 mi51 min W 8 G 9.9 75°F 1018 hPa
44062 - Gooses Reef, MD 47 mi41 min SE 3.9 G 5.8 77°F 1019.2 hPa
44043 - Patapsco, MD 49 mi41 min W 7.8 G 14 76°F 1018.8 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi83 minNNW 4 G 1710.00 miA Few Clouds80°F41°F26%1019.2 hPa
Washington/Reagan National Airport, DC, VA10 mi29 minno data10.00 miPartly Cloudy81°F43°F26%1018.4 hPa
Washington/Dulles International Airport, DC, VA15 mi29 minWNW 1010.00 miPartly Cloudy78°F44°F30%1018.3 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA18 mi25 minVar 410.00 miPartly Cloudy79°F48°F34%1019.6 hPa
College Park Airport, MD19 mi28 minWSW 7 G 1410.00 miPartly Cloudy79°F43°F28%1018.3 hPa
Camp Springs / Andrews Air Force Base, MD19 mi23 minW 7 G 1410.00 miA Few Clouds79°F42°F27%1018.7 hPa
Quantico Marine Corps Airfield - Turner Field, VA23 mi25 minVar 510.00 miPartly Cloudy83°F44°F25%1018.5 hPa
Gaithersburg - Montgomery County Airport, MD24 mi25 minNW 510.00 miMostly Cloudy75°F48°F39%1021.5 hPa

Wind History from DAA (wind in knots)
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Last 24hrSW6NW7NW9W9W9NW13NW9
G15
NW5CalmCalmCalmCalmSE3CalmCalmCalmCalmCalmCalmNW8NW14
G19
NW13
G18
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W5
1 day agoW11SW7W10W7W7W5CalmCalmCalmCalmCalmSE3CalmCalmCalmCalmCalmCalmCalmNW6NW6W3NW11W7
2 days agoS6
G19
S7S4S7S5S8S8S4SE4S5S6S7S6SE5S6W12
G25
NW12NW11W10W12NW11W12
G18
W11W10

Tide / Current Tables for Key Bridge, Washington, D.C.
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Key Bridge
Click for Map
Mon -- 05:11 AM EDT     0.07 feet Low Tide
Mon -- 05:44 AM EDT     Sunrise
Mon -- 08:37 AM EDT     Moonrise
Mon -- 10:46 AM EDT     3.70 feet High Tide
Mon -- 05:58 PM EDT     -0.13 feet Low Tide
Mon -- 08:37 PM EDT     Sunset
Mon -- 10:53 PM EDT     Moonset
Mon -- 11:26 PM EDT     3.27 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.82.11.40.80.40.10.212.133.63.73.32.71.91.30.70.1-0.10.21.12.12.83.2

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Mon -- 05:16 AM EDT     0.07 feet Low Tide
Mon -- 05:44 AM EDT     Sunrise
Mon -- 08:37 AM EDT     Moonrise
Mon -- 10:51 AM EDT     3.70 feet High Tide
Mon -- 06:03 PM EDT     -0.13 feet Low Tide
Mon -- 08:37 PM EDT     Sunset
Mon -- 10:54 PM EDT     Moonset
Mon -- 11:31 PM EDT     3.27 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.82.11.50.90.40.10.20.9233.53.73.42.721.30.70.2-0.10.2122.83.2

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 (13,3,4,5)
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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.