Monday, September25, 2017 L-36.com


Marine Weather and Tides
Belle Haven, 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 6:58AMSunset 7:00PM Monday September 25, 2017 2:57 PM EDT (18:57 UTC) Moonrise 11:05AMMoonset 9:31PM Illumination 26% 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- 132 Pm Edt Mon Sep 25 2017
This afternoon..E winds 5 kt. Waves less than 1 ft.
Tonight..NE winds 5 kt. Waves less than 1 ft.
Tue..NE winds 5 kt. Waves less than 1 ft.
Tue night..NE winds 5 kt. Waves less than 1 ft.
Wed..N winds 5 to 10 kt. Waves 1 ft.
Wed night..N winds 5 kt. Waves less than 1 ft.
Thu..N winds 5 to 10 kt. Waves 1 ft.
Fri..W winds 5 kt. Waves less than 1 ft.
ANZ500 132 Pm Edt Mon Sep 25 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A ridge of high pressure will remain over the waters today, then weaken during the middle of the week as hurricane maria approaches north carolina. Small craft advisories may be needed Tuesday night through Wednesday night. A strong cold front will cross the region Thursday, with gales possible. Refer to the latest statements from the national hurricane center for up-to-date information on hurricane maria.

7 Day Forecast for Marine Location Near Belle Haven, VA
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location: 38.78, -77.05     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 251412 aaa
afdlwx
area forecast discussion... Updated
national weather service baltimore md washington dc
1012 am edt Mon sep 25 2017

Synopsis
High pressure will remain in place today, then slowly weaken
its grip over the area Tuesday and Wednesday as hurricane maria
moves northward through the western atlantic. A cold front will
move through Thursday, bringing more seasonable temperatures for
the end of the week. Little if any rain is expected.

Near term through tonight
Ridge of high pressure will continue to hold over the region
today, but it will begin to weaken. No precip is expected as a
result. Highs again today around 90f similar to yesterday.

Previous afd...

tonight, the influence of maria will increase somewhat as it
continues moving north and approaches the outer banks. Northeast
flow will increase, but remain in the 10-15 mph range overall.

This may allow moisture to move in from the atlantic, so there
maybe some more patchy fog or low clouds. Otherwise, another
mild night, with lows mostly in the 60s.

Short term Tuesday through Wednesday night
Maria will push northward and then stall just east of the outer
banks Tuesday and Wednesday before getting kicked out to sea by
an approaching trough cold front during the long term period. It
will stay far enough away such that influence on our region will
be minimal, with just an increased northeast breeze, perhaps
reaching 25 mph in gusts in far S md, and slightly cooler temps
thanks to increased clouds and a chance of a few showers with
highest chance near the bay. Highs will cool slightly, but
remain well above normal with 80s continued. Lows at night still
in the 60s.

Long term Thursday through Sunday
There's really not much prospect for appreciable precip through
the weekend. The region will remain ensconced by high pressure,
with a dry cold front Thursday and an upper-level trough
Saturday the only exceptions. The guidance has trended quicker
and flatter with the Saturday trough, which lowers the chance
for widespread precipitation, though an increase in clouds and a
few scattered showers are still plausible.

Gusty winds are likely both Thursday behind the dry frontal
passage and again Saturday with the trough axis. Although it
will be noticeably breezy, wind gusts in both periods should
remain well below any headline criteria over land.

Aviation 14z Monday through Friday
Vfr generally expected through Wednesday. Patchy fog possible
which could result in reduced vis at mrb, cho and perhaps even
iad, though odds at the latter are lower. Fog possible again
tomorrow night, though odds reduced as surface winds will begin
to increase as maria gets a little closer. Maria unlikely to
produce much effect on local weather other than a northeast to
north breeze perhaps gusting to 20 knots Tuesday and Wednesday,
and perhaps a stray shower.

MainlyVFR expected to end the week. Gusty N winds Thu behind
frontal passage, becoming lighter fri.

Marine
Winds sub SCA today as high pressure lingers. Winds will start
to increase tonight into Tuesday as maria approaches nc from the
se. Wind field will be expanding, so issued SCA for our
southernmost bay zones, but looks marginal to be sure. Sca
likely to continue through Wednesday, mainly our southernmost
bay zones though. Otherwise, no more than a stray shower
expected from maria.

Solid SCA conditions likely in northerly surge behind a cold
frontal passage Thursday. Gales possible.

Tides coastal flooding
Anomalies have receded significantly for the time being, but
will gradually increase as maria brushes nc and heads out to
sea. The threat for (minor) flooding will likely return by
Tuesday afternoon and linger into early Thursday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 10 am to 6 pm edt Tuesday for anz534-
543.

Update... Lfr
products... Rcm dfh


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 7 mi40 min E 1 G 7 88°F 77°F1016.1 hPa
BSLM2 - Chesapeake Bay, MD 18 mi148 min SE 1 81°F 1017 hPa63°F
NCDV2 32 mi40 min SSE 2.9 G 4.1 83°F 78°F1015.3 hPa
APAM2 - 8575512 - Annapolis, MD 33 mi40 min 83°F 1015.7 hPa
44063 - Annapolis 34 mi28 min Calm G 1.9 82°F 1015.3 hPa
TPLM2 - Thomas Point, MD 34 mi58 min N 6 G 6 79°F 78°F
44062 - Gooses Reef, MD 37 mi28 min N 5.8 G 7.8 79°F 1016.8 hPa
CPVM2 38 mi40 min 81°F 69°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 41 mi40 min SE 5.1 G 6 80°F 1016.2 hPa
BLTM2 - 8574680 - Baltimore, MD 42 mi40 min S 2.9 G 5.1 84°F 79°F1015.8 hPa
44043 - Patapsco, MD 43 mi28 min NNW 1.9 G 1.9 81°F 1017.4 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 44 mi40 min N 12 G 13 77°F 1016.6 hPa
SLIM2 - 8577330 - Solomons Island, MD 45 mi40 min NNE 5.1 G 8.9 81°F 78°F1015.5 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA6 mi66 minNNE 510.00 miMostly Cloudy90°F66°F47%1016.4 hPa
Fort Belvoir, VA8 mi62 minENE 310.00 miFair89°F65°F46%1016.5 hPa
Camp Springs / Andrews Air Force Base, MD10 mi2 hrsNNE 610.00 miFair85°F66°F54%1017.4 hPa
College Park Airport, MD15 mi73 minE 310.00 miFair86°F66°F52%1016.6 hPa
Quantico Marine Corps Airfield - Turner Field, VA23 mi62 minENE 610.00 miMostly Cloudy88°F69°F54%1016.6 hPa

Wind History from DCA (wind in knots)
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Last 24hrNE6E7NE7NE7SE6S4CalmN4CalmN4NW6N4CalmN3CalmN4CalmCalmNE3CalmCalmCalmNE6N5
1 day agoN8N4N7N6N6N4N5N5CalmCalmSW3CalmCalmCalmN3N8NW5N4N6NW6NE9E4CalmE5
2 days agoNW9N9W9NW9N5N3CalmCalmCalmCalmN6N6N6N6N6N6N4N6N6N4N6NE6N9N11
G19

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Mon -- 12:05 AM EDT     3.27 feet High Tide
Mon -- 06:57 AM EDT     0.47 feet Low Tide
Mon -- 06:58 AM EDT     Sunrise
Mon -- 12:04 PM EDT     Moonrise
Mon -- 12:37 PM EDT     2.92 feet High Tide
Mon -- 06:42 PM EDT     0.44 feet Low Tide
Mon -- 06:59 PM EDT     Sunset
Mon -- 10:31 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.33.12.621.40.90.60.50.71.322.62.92.92.51.91.30.80.50.40.71.32.12.7

Tide / Current Tables for Mount Vernon, Virginia
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Mount Vernon
Click for Map
Mon -- 06:32 AM EDT     0.39 feet Low Tide
Mon -- 06:58 AM EDT     Sunrise
Mon -- 12:04 PM EDT     Moonrise
Mon -- 12:12 PM EDT     2.30 feet High Tide
Mon -- 06:17 PM EDT     0.36 feet Low Tide
Mon -- 07:00 PM EDT     Sunset
Mon -- 10:31 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.62.31.91.40.90.60.40.40.71.31.82.12.32.21.81.30.80.50.40.40.71.31.92.3

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 (14,3,4,5)
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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.