Tuesday, October17, 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 7:19AMSunset 6:27PM Tuesday October 17, 2017 7:11 AM EDT (11:11 UTC) Moonrise 3:58AMMoonset 4:42PM Illumination 9% Phase: Waning Crescent; Moon at 27 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- 547 Am Edt Tue Oct 17 2017
Today..N winds 5 kt. Waves less than 1 ft.
Tonight..Light winds. Waves flat.
Wed..Light winds. Waves flat.
Wed night..Light winds. Waves flat.
Thu..SW winds around 5 kt. Waves 1 ft or less.
Thu night..W winds around 5 kt. Waves 1 ft.
Fri..NW winds around 5 kt. Waves 1 ft or less.
Sat..S winds around 5 kt. Waves 1 ft or less.
ANZ500 547 Am Edt Tue Oct 17 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain in place through the rest of the week and into the weekend.

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 170740
afdlwx
area forecast discussion
national weather service baltimore md washington dc
340 am edt Tue oct 17 2017

Synopsis
High pressure will remain across the mid atlantic through the
rest of the week and this weekend. A low pressure system may
affect the region early next week.

Near term until 6 pm this evening
The elongated center of high pressure is located from the
central appalachians to mid-mississippi valley this morning.

This position has allowed enough gradient that winds have been
slow to calm, especially east of the blue ridge. Will give
temperatures another hour or two to fall, but some headlines may
be able to be cancelled.

The high will continue to overspread the area today, with full
sunshine expected. The thermal trough will exiting slowly, so
highs should only reach the lower to mid 60s once again.

Short term 6 pm this evening through Thursday night
The center of high pressure will remain over the mid-atlantic
through the middle of the week, then being pushed back to the
southwest a little by late Thursday as a shortwave trough swings
across the area. Some cirrus could be associated with this
feature as well but otherwise skies will be clear.

Tonight will offer another opportunity for frost, with perhaps
a better chance for most outlying areas across the CWA given
calm winds and dew points in the mid 30s. Think the freeze
potential is fairly low, but it could be close in the colder
valleys.

With deeper low level ridging, temperatures will moderate
Wednesday and Thursday, with highs edging into the 70s. Some of
the typical colder locales could be close to frost potential
Wednesday night, but lows will be back into the 40s for most
(50s for the cities) by Thursday night.

Long term Friday through Monday
High pressure will cross the region Friday and pass off the
atlantic coast Saturday. It will remain in control off the coast
Sunday, but then an approaching cold front and low pressure wave
will begin to increase clouds Sunday night, with an increasing
chance of rain on Monday. Southerly flow will allow temperatures
to remain mild even Monday despite the increased cloud cover and
increasing risk of rain... With highs in the 70s through the
long term. Lows will be moderating, with 40s to start and 50s
likely by Sunday night. In fact, if clouds and southerly flow
dominate enough, its not impossible that it stays in the 60s in
many locales Sunday night.

Guidance is pretty impressive with the wave of low pressure
Monday night into Tuesday, with a signal for heavy rain and
possibly thunderstorms, but given that it is still a week out,
a lot can still change.

Aviation 08z Tuesday through Saturday
High pressure will provide mostly clear skies and light winds
through Saturday.

Marine
There's still enough gradient to allow small craft advisory
conditions on the wider waterways this morning. Based on
forecast winds aloft, don't think winds will really start
calming until mid- morning from north to south. Have thus made
extensions to some segments of the advisory, although it still
looks like winds will fall below criteria by noontime.

High pressure moves in from the west later today and will
remain nearby through Saturday. Winds will be 10 kt or less
through the period.

Lwx watches warnings advisories
Dc... None.

Md... Frost advisory until 9 am edt this morning for mdz003>006-
501>503-505-507.

Va... Frost advisory until 9 am edt this morning for vaz025>031-039-
040-050-051-501-502-505-506.

Freeze warning until 9 am edt this morning for vaz503-504.

Wv... Frost advisory until 9 am edt this morning for wvz050>053-055-
503-504.

Freeze warning until 9 am edt this morning for wvz501-502-505-
506.

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

Small craft advisory until 6 am edt early this morning for
anz536.

Synopsis... Rcm
near term... Ads
short term... Ads
long term... Rcm
aviation... Ads rcm
marine... Ads rcm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi42 min N 4.1 G 5.1 49°F 70°F1027.5 hPa
BSLM2 - Chesapeake Bay, MD 27 mi102 min Calm 39°F 1027 hPa39°F
NCDV2 37 mi42 min N 2.9 G 5.1 47°F 67°F1026.2 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi42 min 50°F 1026.4 hPa
TPLM2 - Thomas Point, MD 42 mi72 min N 16 G 19 52°F 68°F
BLTM2 - 8574680 - Baltimore, MD 45 mi42 min NE 6 G 8 47°F 71°F1026.9 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 45 mi42 min N 9.9 G 11 47°F 1027.1 hPa
CPVM2 46 mi42 min 52°F 38°F

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Last
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N7
G19
NW13
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G17
N7
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NW5
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--
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi16 minN 010.00 miFair40°F37°F91%1028.1 hPa
Washington/Reagan National Airport, DC, VA10 mi20 minN 610.00 miA Few Clouds47°F37°F69%1027.8 hPa
Washington/Dulles International Airport, DC, VA15 mi20 minN 010.00 miFair37°F35°F93%1027.7 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA18 mi16 minN 010.00 miFair35°F35°F100%1029.3 hPa
College Park Airport, MD19 mi27 minN 010.00 miFair38°F36°F95%1027.4 hPa
Camp Springs / Andrews Air Force Base, MD19 mi14 minN 510.00 miFair41°F34°F78%1027.8 hPa
Quantico Marine Corps Airfield - Turner Field, VA23 mi16 minNW 510.00 miA Few Clouds44°F39°F83%1028.1 hPa
Gaithersburg - Montgomery County Airport, MD24 mi16 minN 010.00 miFair37°F35°F93%1030.9 hPa

Wind History from DAA (wind in knots)
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Last 24hrCalmNW6NW9NW7NW15
G26
NW14
G22
NW13
G22
N7
G21
NW10
G22
N6
G15
NW11
G16
NW6NW5CalmNW7N3NW5N3NW4NW4--CalmCalmCalm
1 day agoS4S3SW4S5S4S6S9S6
G17
S7S4SE4S4CalmS3S5S3S3W4NW11NW10
G16
NW7NW3CalmCalm
2 days agoCalmNW3NW4NW3CalmCalmCalmCalmCalmCalmSE5CalmCalmCalmS5SE4SE3SE3CalmSW4CalmCalmCalmS4

Tide / Current Tables for Key Bridge, Washington, D.C.
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Key Bridge
Click for Map
Tue -- 01:28 AM EDT     0.04 feet Low Tide
Tue -- 04:57 AM EDT     Moonrise
Tue -- 07:12 AM EDT     3.30 feet High Tide
Tue -- 07:20 AM EDT     Sunrise
Tue -- 01:55 PM EDT     -0.02 feet Low Tide
Tue -- 05:41 PM EDT     Moonset
Tue -- 06:26 PM EDT     Sunset
Tue -- 07:38 PM EDT     3.36 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.10.10.71.62.433.33.12.621.30.80.2-00.31.122.83.33.32.92.31.6

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Tue -- 01:33 AM EDT     0.04 feet Low Tide
Tue -- 04:57 AM EDT     Moonrise
Tue -- 07:17 AM EDT     3.30 feet High Tide
Tue -- 07:20 AM EDT     Sunrise
Tue -- 02:00 PM EDT     -0.02 feet Low Tide
Tue -- 05:41 PM EDT     Moonset
Tue -- 06:26 PM EDT     Sunset
Tue -- 07:43 PM EDT     3.36 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.10.10.61.52.333.33.22.721.40.80.3-00.31.122.73.23.332.41.7

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 (7,2,3,4)
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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.