Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Ravensworth, 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 6:55AMSunset 7:07PM Thursday September 21, 2017 9:54 AM EDT (13:54 UTC) Moonrise 7:12AMMoonset 7:14PM Illumination 1% Phase: New Moon; Moon at 1 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- 731 Am Edt Thu Sep 21 2017
Today..N winds 5 kt. Waves less than 1 ft.
Tonight..NW winds around 5 kt. Waves 1 ft. Patchy fog. Vsby 1 to 3 nm.
Fri..N winds around 5 kt. Waves 1 ft.
Fri night..N winds around 5 kt. Waves 1 ft or less.
Sat..N winds 5 kt. Waves less than 1 ft.
Sat night..NW winds around 5 kt. Waves 1 ft or less.
Sun..NE winds around 5 kt. Waves 1 ft or less.
Mon..NE winds around 5 kt. Waves 1 ft or less.
ANZ500 731 Am Edt Thu Sep 21 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A ridge of high pressure will remain over the eastern united states through early next week.

7 Day Forecast for Marine Location Near Ravensworth, VA
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location: 38.82, -77.22     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 210800
afdlwx
area forecast discussion
national weather service baltimore md washington dc
400 am edt Thu sep 21 2017

Synopsis
High pressure both at the surface and aloft will build overhead
through the weekend. Hurricane maria may approach the mid-
atlantic coast middle of next week.

Near term through tonight
Early this morning, jose continues to meander off the coast of
new england, well to our east, while a ridge of high pressure is
building over the midwest aloft. At the surface, the high
pressure ridge extends along the appalachians. The only fly in
the ointment is the trough which brought showers and
thunderstorms to western virginia yesterday - this system
remains nearby, but is slowly sinking south. Its influence may
still bring a stray shower to the far southwestern corner of the
cwa this afternoon, but odds look considerably less than
yesterday, so have just included some slight chance pops for
now. Otherwise, patchy fog this morning should break for another
mostly sunny and warm day, with another clear to partly cloudy
night with more patchy fog. The air mass is drier than it was 24
hours ago, and we have not had significant rain in a couple
weeks, so dense fog is not going to be as easy to come by as it
might otherwise be. However, a few spots may drop to 1 4 mile
early this morning and again late tonight, but not up to dense
fog advisory calibre. Highs today will be well into the 80s once
again, with lows tonight in the 50s and 60s once again. Winds
will be light.

Short term Friday through Saturday night
High pressure ridge at the surface will remain more or less
stationary over the appalachians through Saturday night. Aloft,
ridge of high pressure centered over the midwest will continue
to extend its influence across our region, while jose will
continue to meander over the northwest atlantic near new
england. End result will be continued warm and dry weather, with
the only real weather concern being extent and coverage of
patchy fog each morning. Highs will be well into the 80s Friday
and Saturday with lows in the 50s and 60s. Winds will be light.

Long term Sunday through Wednesday
Strong ridge of high pressure will remain in place through at
least Sun and likely beyond albeit weakening. With regards to
the track forecast of hurricane maria, global models show maria
having a similar track to jose tracking a little west of 70w.

Please consult NHC forecasts for more info on hurricane maria.

Aviation 08z Thursday through Monday
Main concern through the next several days is patchy late night
and early morning fog, mainly at mrb and cho. Vis could drop
briefly to ifr at either or both sites each of the next three
mornings. An MVFR restriction is not out of the question at the
other terminals (except dca). Otherwise,VFR with light winds
should prevail through Saturday night thanks to high pressure.

No sig wx wx expected through mon.

Marine
High pressure will provide dry weather with sub-sca winds
through Saturday night.

Global models show winds strengthening on Tue as pressure
gradient tightens as hurricane maria gets closer to the mid-atlc
coast middle of next week. For now, it appears small craft
advisories are possible.

Tides coastal flooding
Minor coastal flooding will continue at most of the sites over
the next several days.

Lwx watches warnings advisories
Dc... Coastal flood advisory until noon edt today for dcz001.

Md... Coastal flood advisory until 7 am edt this morning for mdz016-
018.

Coastal flood advisory until noon edt today for mdz011.

Coastal flood advisory until 9 am edt this morning for mdz014.

Coastal flood warning until 6 am edt early this morning for
mdz017.

Va... Coastal flood advisory until 7 am edt this morning for vaz057.

Coastal flood advisory until noon edt today for vaz054.

Wv... None.

Marine... None.

Synopsis... Bjl lfr
near term... Rcm
short term... Rcm
long term... Lfr
aviation... Rcm lfr
marine... Rcm
tides coastal flooding... Lfr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi66 min NW 2.9 G 4.1 73°F 75°F
BSLM2 - Chesapeake Bay, MD 27 mi144 min Calm 56°F 1017 hPa56°F
NCDV2 36 mi66 min NNW 2.9 G 6 73°F 76°F1016.7 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi66 min 77°F 1017 hPa
44063 - Annapolis 42 mi54 min NNE 3.9 G 3.9 73°F 75°F1017.4 hPa (+1.5)
TPLM2 - Thomas Point, MD 42 mi54 min N 7 G 7 72°F 75°F
CPVM2 46 mi66 min 74°F 69°F
BLTM2 - 8574680 - Baltimore, MD 46 mi66 min NNE 6 G 7 74°F 77°F1017.1 hPa
44062 - Gooses Reef, MD 46 mi54 min N 9.7 G 12 74°F 75°F1018 hPa (+1.5)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 46 mi66 min N 4.1 G 4.1 74°F 1017.5 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi1.9 hrsN 010.00 miFair69°F60°F75%1018.2 hPa
Washington/Reagan National Airport, DC, VA10 mi62 minNNW 610.00 miA Few Clouds74°F64°F71%1018.2 hPa
Washington/Dulles International Airport, DC, VA16 mi62 minNNW 410.00 miA Few Clouds69°F64°F84%1018.5 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi58 minN 410.00 miFair72°F64°F76%1019.5 hPa
College Park Airport, MD19 mi69 minN 010.00 miFair69°F62°F80%1017.9 hPa
Camp Springs / Andrews Air Force Base, MD19 mi1.9 hrsNNW 610.00 miFair68°F61°F80%1018.1 hPa
Quantico Marine Corps Airfield - Turner Field, VA22 mi58 minNNW 310.00 miA Few Clouds73°F66°F79%1018.3 hPa
Gaithersburg - Montgomery County Airport, MD24 mi58 minN 010.00 miFair71°F64°F81%1021.4 hPa

Wind History from DAA (wind in knots)
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Last 24hrNW7NW10NW10W8NW9NW6NW8NW8NW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW3CalmNW4
1 day agoN5N6NW7NW7NW11
G15
N6
G15
NW6N6N5NW4NW3NW3NW3NW6NW6NW3NW3NW3NW3NW3NW4NW4NW6NW6
2 days agoCalmE4CalmN3NE3CalmCalmNE3CalmCalmCalmCalmCalmCalmCalmCalmNW4CalmCalmNW4NW5NW5NW7N5

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Thu -- 04:24 AM EDT     0.04 feet Low Tide
Thu -- 06:55 AM EDT     Sunrise
Thu -- 08:11 AM EDT     Moonrise
Thu -- 09:59 AM EDT     3.49 feet High Tide
Thu -- 04:41 PM EDT     0.04 feet Low Tide
Thu -- 07:06 PM EDT     Sunset
Thu -- 08:13 PM EDT     Moonset
Thu -- 10:20 PM EDT     3.56 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.41.710.50.10.10.81.82.73.33.53.22.61.81.20.60.20.10.51.52.53.23.53.4

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Thu -- 03:57 AM EDT     0.04 feet Low Tide
Thu -- 06:55 AM EDT     Sunrise
Thu -- 08:11 AM EDT     Moonrise
Thu -- 09:39 AM EDT     3.38 feet High Tide
Thu -- 04:15 PM EDT     0.05 feet Low Tide
Thu -- 07:06 PM EDT     Sunset
Thu -- 08:13 PM EDT     Moonset
Thu -- 10:00 PM EDT     3.46 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.11.40.80.300.31.12.12.83.33.32.92.31.60.90.40.10.20.91.82.73.23.53.2

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.