Saturday, January25, 2020
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Marine Weather and Tides
Belle Haven, VA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:18AMSunset 5:22PM Saturday January 25, 2020 8:51 PM EST (01:51 UTC) Moonrise 8:02AMMoonset 6:09PM Illumination 1% Phase: Waxing Crescent; 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- 641 Pm Est Sat Jan 25 2020
Tonight..W winds 5 kt. Waves less than 1 ft.
Sun..W winds 5 to 10 kt. Waves 1 ft.
Sun night..SW winds around 5 kt. Waves 1 ft.
Mon..W winds 5 kt. Waves less than 1 ft.
Mon night..NW winds 5 kt. Waves less than 1 ft.
Tue..NW winds 5 to 10 kt. Waves 1 ft.
Tue night..NW winds 5 kt. Waves less than 1 ft.
Wed..N winds around 5 kt. Waves 1 ft.
Thu..NW winds around 5 kt. Waves 1 ft or less.
ANZ500 641 Pm Est Sat Jan 25 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A low pressure system will move away from the waters through evening. Northwest flow ahead of weak high pressure will build behind this system. Small craft advisories may be required Monday night into Tuesday.


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 252007 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 307 PM EST Sat Jan 25 2020

SYNOPSIS. Low pressure will slowly move away from the area through tonight, heading northeast toward the Canadian Maritimes by Sunday. High pressure will return for the early and middle portions of next week.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. Low pressure presently lifting across the Great Lakes with secondary center over New Jersey, with the entire system heading northeastward slowly but surely. Lingering upper level energy as the upper trough swings in combined with low level moisture has resulted in spotty showers, and even a report of small hail. These should dwindle through early this evening, with dry conditions expected for the bulk of the region through the bulk of tonight. Exception will be the upslope region along the Allegany Front, where colder air and upslope flow will result in snow showers. However, accumulations should be minor, with totals of only an inch or two at most. Lows tonight in the 20s to lower 30s overall. If winds go calm overnight, will need to monitor for patchy fog.

SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY NIGHT/. Overall, short term will feature relativly weak west to northwest surface flow, promoting dry conditions east of the mountains and lingering upslope snow showers along and west of the Allegany Front. However, the flow will be weak and the moisture minimal, so accumulations should stay sub-advisory through the short term. A weak low pressure will pass south of the area late Sunday night and Monday, but any precip and most clouds should stay south of the area. Cold advection will result in slightly cooler readings for the next several days, but still generally a bit above normal for late January, with highs in the 40s and lows in the 20s and 30s.

LONG TERM /TUESDAY THROUGH FRIDAY/. Overall model guidance is in somewhat of agreement concerning the long term. Aloft, a quasi-zonal pattern is expected to set up over the Mid-Atlantic during the early part of next week. Back to our west, a split flow develops in the jet stream, with a zonal northern jet, and a trough developing over the Texas Panhandle in the southern stream. The resultant is multiple strings of weak vorticity being ejected eastward. While guidance has been consistent with generally quiet weather through much of next week, have kept PoPs non-zero each day given the high variability of the upper level pattern. With a lack of cold air continuing throughout next week, expect temperatures to remain near seasonable.

AVIATION /20Z SATURDAY THROUGH THURSDAY/. Slowly improving conditions through the rest of today with a drying westerly to northwesterly flow developing, though not particularly strong. CIGS gradually lifting to VFR, though spotty rain showers may bring brief restrictions should the intersect a terminal. Dry tonight through Monday night with VFR, though will need to monitor for patchy fog tonight given the relatively weak flow and ample soil moisture.

Quiet weather is expected to continue through the middle of next week as weak high pressure remains in control of the region. Mainly VFR conditions are expected through Wednesday along with a west/northwesterly wind. Wind gusts up to 25 kts are possible on Tuesday.

MARINE. Flow behind departing low pressure remains fairly weak and do not expect SCA gusts through the next day or two. Flow may increase by Monday night into Tuesday as another weak system crosses the region and then intensifies a bit off the coast, so SCA conditions will be possible by then. Winds will relax thereafter with continued quiet weather.

TIDES/COASTAL FLOODING. Tidal departures remain high, 1-2 feet, but are starting to decline now that winds have turned westerly. The next high tide this afternoon/evening should reach action stage in spots, but is not expected to reach flood stage at any gage, so no advisories are planned. Water levels should decline through tonight with the continued west to northwest flow.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . None.

SYNOPSIS . RCM NEAR TERM . RCM SHORT TERM . RCM LONG TERM . MSS AVIATION . MSS/RCM MARINE . MSS/RCM TIDES/COASTAL FLOODING . RCM


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 7 mi51 min Calm G 1.9 45°F 40°F1012.4 hPa (+1.3)
BSLM2 - Chesapeake Bay, MD 18 mi141 min NNW 2.9 1011 hPa
NCDV2 32 mi51 min Calm G 0 45°F 43°F1011.5 hPa (+1.4)
APAM2 - 8575512 - Annapolis, MD 33 mi51 min 42°F 1011.3 hPa (+1.3)
TPLM2 - Thomas Point, MD 34 mi51 min W 7 G 8 46°F 40°F1012.6 hPa (+1.2)37°F
CPVM2 38 mi51 min 44°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 41 mi51 min WNW 5.1 G 6 47°F 1011.8 hPa (+1.5)
FSNM2 41 mi63 min WNW 8 G 8.9 47°F 1011.3 hPa
BLTM2 - 8574680 - Baltimore, MD 42 mi51 min NW 2.9 G 5.1 47°F 39°F1011.3 hPa (+1.4)
SLIM2 - 8577330 - Solomons Island, MD 45 mi51 min Calm G 1 44°F 42°F1011.9 hPa (+1.7)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA6 mi59 minN 310.00 miMostly Cloudy46°F39°F77%1012.4 hPa
Fort Belvoir, VA8 mi1.9 hrsN 010.00 miOvercast46°F38°F75%1012.1 hPa
Camp Springs / Andrews Air Force Base, MD10 mi55 minNW 410.00 miOvercast46°F37°F74%1012.6 hPa
College Park Airport, MD15 mi63 minN 010.00 miPartly Cloudy41°F35°F81%1012.2 hPa
Quantico Marine Corps Airfield - Turner Field, VA23 mi55 minWNW 510.00 miOvercast44°F42°F93%1012.8 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrNE9E11
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1 day agoCalmCalmNE6NE3NE4NE5NE4NE6N4NE5E5NE6NE7NE6E5CalmE6E8E6E7NE6NE7E10E9
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2 days agoS3CalmW3CalmCalmCalmCalmCalmCalmCalmCalmNE3CalmCalmE4CalmCalmCalmCalmS4CalmCalmE6Calm

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Sat -- 02:54 AM EST     -0.24 feet Low Tide
Sat -- 07:19 AM EST     Sunrise
Sat -- 08:01 AM EST     Moonrise
Sat -- 08:29 AM EST     2.46 feet High Tide
Sat -- 02:55 PM EST     -0.22 feet Low Tide
Sat -- 05:21 PM EST     Sunset
Sat -- 06:09 PM EST     Moonset
Sat -- 08:47 PM EST     2.72 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.5-0-0.20.10.71.52.12.42.421.40.80.3-0-0.200.71.52.22.62.72.41.9

Tide / Current Tables for Mount Vernon, Virginia
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Mount Vernon
Click for Map
Sat -- 02:29 AM EST     -0.20 feet Low Tide
Sat -- 07:19 AM EST     Sunrise
Sat -- 08:01 AM EST     Moonrise
Sat -- 08:04 AM EST     1.94 feet High Tide
Sat -- 02:30 PM EST     -0.18 feet Low Tide
Sat -- 05:21 PM EST     Sunset
Sat -- 06:09 PM EST     Moonset
Sat -- 08:22 PM EST     2.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.60.2-0.1-0.10.20.81.41.81.91.81.40.90.50.1-0.1-0.10.20.81.51.92.12.11.71.3

Weather Map
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wmap_A
GEOS Local Image of Mid-Atlantic    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (20,4,5,8)
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Ground Weather Radar Station Sterling, VA
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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 numerous 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.