Friday, December13, 2019
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Marine Weather and Tides
Washington, DC

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:16AMSunset 4:48PM Friday December 13, 2019 8:19 AM EST (13:19 UTC) Moonrise 6:17PMMoonset 8:35AM Illumination 97% Phase: Waning Gibbous; Moon at 16 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- 654 Am Est Fri Dec 13 2019
Today..NE winds 5 kt. Waves less than 1 ft. Rain likely.
Tonight..N winds 5 kt. Waves less than 1 ft. Rain. Vsby 1 to 3 nm.
Sat..SW winds 5 to 10 kt. Waves 1 ft. Rain likely.
Sat night..W winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Sun..W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sun night..N winds around 5 kt. Waves 1 ft.
Mon..S winds around 5 kt. Waves 1 ft. Rain likely.
Tue..NW winds 5 to 10 kt. Waves 1 ft. Showers likely through the day.
ANZ500 654 Am Est Fri Dec 13 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure system developing over the northern gulf of mexico will move northeastward toward the region Friday into Saturday. Small craft advisories may be needed Saturday through Sunday morning, and again on Tuesday.


7 Day Forecast for Marine Location Near Washington, DC
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location: 38.89, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 130901 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 401 AM EST Fri Dec 13 2019

SYNOPSIS. Low pressure will move north up the East Coast today and Saturday. High pressure will return briefly on Sunday before another system potentially affects the region Monday into Tuesday. Cold high pressure will then follow for the middle of next week.

NEAR TERM /THROUGH SATURDAY/. Radar imagery shows leading edge of rain pushing northeastward through central portions of Bath, Rockbridge, and Amherst Counties in southwestern Virginia. We have slowed down this forward progress of rainfall by an hour or two. This leading edge should enter our CWA counties of Highland, Augusta, and Nelson Counties around 430am. Temperatures in this region of 28 to 32 degrees would support freezing rain for a few hours after onset. As this rain moves farther northeast just before and during daybreak today, temperatures across the metro areas, eastern and northeast Virginia, and parts of central Maryland will rise a few degrees to just above freezing. Thus, the expectation of freezing rain is these areas are minimal to none through this morning. Areas of greater concern for freezing rain and ice accumulations are along and west of US 15 from Frederick County, Maryland, southwest into western Loudoun and northern Fauquier Counties in Virginia, and all other areas to the southwest and west. A Winter Weather Advisory remains in effect for the aforementioned areas through midday or into this afternoon. Parts of western Maryland and northern West Virginia could see an ongoing threat for ice accumulations through late this afternoon. Elevations below 1500 feet would be more susceptible.

As temperatures modify throughout the day today into tonight, there will be a transition to plain rain with rain amounts averaging one half to one inch. The low pressure system responsible for this wintry weather and soaking rainfall will depart to the northeast later tonight and Saturday morning. Rainfall will end from south to north during this period. High pressure will build into the region Saturday. A shift of wind direction to more of a west-northwest flow will promote some upslope snowfall later Saturday into Saturday night. A couple of inches of snow could occur at elevations above 2500 feet.

SHORT TERM /SATURDAY NIGHT THROUGH SUNDAY NIGHT/. Upslope snow will continue Saturday night before tapering and ending Sunday. Cold high pressure will become the flavor Sunday into Sunday night. Temperatures will be below average. A developing warm front to our southwest will propagate northward later Sunday night. This warm front could bring a wave of light snow or perhaps a mix of snow, sleet or rain to our western and west-central zones.

LONG TERM /MONDAY THROUGH THURSDAY/. Low pressure moving through the Ohio Valley Monday will be dragging a warm front toward the area. Strong warm advection/isentropic lift (again) will lead to another overrunning precipitation threat, with cold air potentially trapped at boundary level. The low pressure track, both surface and 850 mb, does suggest a changeover to rain prior to cold frontal passage on Tuesday. Even the ECMWF Ensemble looks warmer, and will blend a warmer solution into the forecast.

The rest of the extended forecast will feature high pressure but chilly temperatures in northwest flow.

AVIATION /09Z FRIDAY THROUGH TUESDAY/. IFR to LIFR conditions expected today through midday Saturday. Conditions will improve to VFR conditions Saturday afternoon through Sunday evening. A brief MVFR period is possible at CHO and MRB with some wintry precipitation Sunday night.

Flight restrictions likely Monday into Tuesday as another storm system crosses the terminals. While temperatures should be just warm enough for mainly rain, a wintry mix is possible at the onset . especially at MRB.

MARINE. Small craft advisory conditions possible Saturday night and Sunday. Mixing will be rather poor on Monday as a storm system crosses the waters. However, on Tuesday, expect a cold frontal passage producing gusty northwest winds. Small Craft Advisory conditions likely.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Winter Weather Advisory from 9 AM this morning to 3 PM EST this afternoon for MDZ003-004. Winter Weather Advisory from 9 AM this morning to 6 PM EST this evening for MDZ501-502. VA . Winter Weather Advisory until 3 PM EST this afternoon for VAZ025-026-036>038-503-504-508. Winter Weather Advisory from 9 AM this morning to 3 PM EST this afternoon for VAZ505. Winter Weather Advisory from 7 AM this morning to 3 PM EST this afternoon for VAZ027>031-039-040-501-507. WV . Winter Weather Advisory until 3 PM EST this afternoon for WVZ505-506. Winter Weather Advisory from 9 AM this morning to 3 PM EST this afternoon for WVZ051>053. Winter Weather Advisory from 7 AM this morning to 3 PM EST this afternoon for WVZ050-055-501-502. Winter Weather Advisory from 7 AM this morning to 6 PM EST this evening for WVZ503-504. MARINE . None.

SYNOPSIS . HTS NEAR TERM . KLW SHORT TERM . KLW LONG TERM . HTS AVIATION . HTS/KLW MARINE . HTS/KLW


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 1 mi49 min NNE 1.9 G 4.1 37°F 43°F1029 hPa
BSLM2 - Chesapeake Bay, MD 19 mi109 min Calm 32°F 1028 hPa29°F
APAM2 - 8575512 - Annapolis, MD 30 mi49 min 37°F 1027.5 hPa
44063 - Annapolis 31 mi31 min NW 7.8 G 7.8 37°F 44°F1028.6 hPa
TPLM2 - Thomas Point, MD 31 mi79 min ENE 8.9 G 11 35°F 44°F1028.8 hPa (-2.8)33°F
BLTM2 - 8574680 - Baltimore, MD 35 mi49 min NNE 4.1 G 5.1 35°F 45°F1028.2 hPa
CPVM2 35 mi49 min 38°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 35 mi49 min NNW 5.1 G 6 34°F 1028.6 hPa
FSNM2 35 mi61 min NNW 5.1 G 6 34°F 1027.9 hPa
NCDV2 39 mi49 min NNW 5.1 G 7 35°F 46°F1027.4 hPa
44062 - Gooses Reef, MD 40 mi37 min E 14 G 14 38°F 1027.9 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 47 mi49 min E 6 G 9.9 34°F 42°F1027.8 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi27 minN 68.00 miOvercast37°F28°F73%1028.8 hPa
Camp Springs / Andrews Air Force Base, MD9 mi83 minNW 610.00 miOvercast33°F28°F82%1029.4 hPa
College Park Airport, MD9 mi43 minN 010.00 miOvercast34°F24°F70%1028.8 hPa
Fort Belvoir, VA14 mi83 minNNW 410.00 miOvercast36°F26°F69%1029.1 hPa
Fort Meade / Tipton, MD20 mi25 minN 010.00 miOvercast34°F30°F87%1029.5 hPa
Gaithersburg - Montgomery County Airport, MD21 mi23 minN 010.00 miOvercast33°F27°F78%1030.2 hPa
Washington/Dulles International Airport, DC, VA23 mi27 minNNE 410.00 miLight Rain34°F26°F73%1028.6 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrNE9NE4CalmCalmCalmCalmCalmSE6SE8SE7SE8SE7E7CalmNE3E3NE4CalmNE5N6N9E8NE5N6
1 day agoNW9
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W14NW106W9W8W5N9N10W9NW9NW7Calm4N4N9N9N14N13NE9E4
2 days agoS12SW10SW10SW6SW3CalmN11NW7N6NW8NW12NW15NW13NW13
G27
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NW11NW6NW9NW9NW5

Tide / Current Tables for Washington, Potomac River, D.C.
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Bladensburg, Anacostia River, Maryland
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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 (8,2,3,4)
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Ground Weather Radar Station Sterling, VA
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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.