Sunday, January26, 2020
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Marine Weather and Tides
National Harbor, MD

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 7:17AMSunset 5:23PM Sunday January 26, 2020 6:01 AM EST (11:01 UTC) Moonrise 8:37AMMoonset 7:09PM Illumination 2% 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- 338 Am Est Sun Jan 26 2020
Rest of the overnight..W winds 5 kt. Waves less than 1 ft.
Today..W winds 5 to 10 kt. Waves 1 ft.
Tonight..W winds 5 kt. Waves less than 1 ft.
Mon..W winds 5 to 10 kt. Waves 1 ft.
Mon night..NW winds 5 to 10 kt. Waves 1 ft.
Tue..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Tue night..NW winds 5 to 10 kt. Waves 1 ft.
Wed..N winds 5 kt. Waves less than 1 ft.
Thu..NE winds around 5 kt. Waves 1 ft or less.
ANZ500 338 Am Est Sun Jan 26 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Northwest flow in the wake of low pressure centered over new england and the canadian maritimes will continue through Monday. An upper level disturbance will pass south of the waters Monday night. High pressure will build toward midweek. Small craft advisories may be required Monday night into Tuesday.


7 Day Forecast for Marine Location Near National Harbor, MD
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location: 38.8, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 260858 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 358 AM EST Sun Jan 26 2020

SYNOPSIS. Cyclonic flow, in the wake of low pressure centered over New England and the Canadian Maritimes, will continue through Monday. An upper level disturbance will cross the region Monday afternoon and evening. High pressure will build toward midweek.

NEAR TERM /THROUGH TONIGHT/. The strongest synoptic feature on this morning's weather map is surface low pressure across New England, stretching west to the parent upper low over the eastern Great Lakes. Ample cloud cover continues not just over the Appalachians but spilling east to the I-81 corridor. There are also some clouds east of I-95. These clouds and a persistent light winds keeping temperatures propped up slightly. In between, however, temperatures have been able to drop where winds have decoupled . and localized valley fog has developed as well (particularly true in the Rappahannock Valley).

The forecast area will remain within cyclonic flow today/tonight, with random pieces of shortwave energy crossing the area. The lower-mid levels remain somewhat moist, sufficient for periods of clouds. In the mountains, scattered snow showers remain plausible along the western slopes, but west flow will keep moisture limited and accumulations light (Great Lakes won't be a contributing factor).

Temperatures remain slightly above climo . in the 40s during the day and lower-mid 30s at night.

SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/. Cyclonic flow will remain through Monday. A weak low pressure, and its supporting shortwave, will pass south of the area Monday afternoon-evening. There will be little sensible change in weather conditions, with temperatures/skycover similar to Sunday-Sunday night. Mountain snow showers may be a little more prolific in the wake of this trough, but still not more than an inch or so of additional snow.

Ridging will become a little more pronounced by Tuesday as the upper low wobbles into the western Atlantic. The trough passage will bring slightly cooler air as well, but afternoon highs still in the mid 30s-mid 40s.

LONG TERM /WEDNESDAY THROUGH SATURDAY/. The large scale flow pattern across the CONUS will be rather disorganized at the start of the long term period. Multiple small, weak disturbances will be working their way from west to east across eastern portions of the country, but the pattern will be devoid of any well organized systems. No precipitation is expected Wednesday or Thursday, with highs in the low 40s and lows in the mid-upper 20s.

Two strong cyclogenesis events will occur in the poleward exit region of the North Pacific Jet during the Tuesday through Thursday time period. These cyclogenesis events will lead to strong ridgebuilding downstream across the western CONUS, while also encouraging a shortwave to dig southward toward TX/Northern Mexico by late Thursday into Friday. Multiple additional disturbances will descend down the front side of the developing ridge and interact with the aforementioned shortwave. The result of interactions between these disturbances remains highly uncertain. Possibilities range from phasing between the disturbances, development of a deep longwave trough, and the formation of a coastal low, to a cutoff shortwave suppressed well to our south, with predominantly dry conditions. With significant spread in both deterministic and ensemble guidance, confidence in any given solution is very low at this time, with both timing and amount of precipitation in the late week/weekend period very much up in the air.

AVIATION /08Z SUNDAY THROUGH THURSDAY/. Cyclonic flow will bring periods of stratocumulus clouds across the terminals over the next couple of days. Clouds bases (and occasional cigs) should be in the 4000-5000 ft range. VFR expected to prevail through Thursday. Gusts to near 20 kt possible each afternoon through Tuesday.

MARINE. Daytime air temperatures will be warmer than the water today and tomorrow, which will inhibit momentum transfer. Therefore, do not believe that the 20 kt at the top of the mixed layer will reach the water's surface. The passage of a shortwave trough Monday afternoon may change that-- have maintained possible Small Craft Advisories Monday night into Tuesday morning.

Sub-SCA level winds and quiet weather conditions are expected over the water through the middle of the week.

TIDES/COASTAL FLOODING. Water levels running near a foot above astronomical normals, and should remain so for today and tonight. May reach Action Stage at several sites, but no inundation anticipated. Water levels should recede behind a shortwave trough on Monday.

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

SYNOPSIS . HTS NEAR TERM . HTS SHORT TERM . HTS LONG TERM . KJP AVIATION . HTS MARINE . HTS/KJP TIDES/COASTAL FLOODING . HTS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 5 mi44 min S 1.9 G 2.9 39°F 40°F1012.5 hPa
BSLM2 - Chesapeake Bay, MD 17 mi152 min Calm 1012 hPa
APAM2 - 8575512 - Annapolis, MD 32 mi44 min 41°F 1011.6 hPa
TPLM2 - Thomas Point, MD 32 mi62 min SW 5.1 G 5.1 40°F 40°F1013.1 hPa (+0.0)30°F
NCDV2 33 mi50 min WSW 1 G 1.9 41°F 43°F1012 hPa
CPVM2 37 mi50 min 42°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 39 mi44 min WSW 8 G 8.9 40°F 1012 hPa
FSNM2 39 mi56 min WSW 14 G 15 42°F 1011.4 hPa
BLTM2 - 8574680 - Baltimore, MD 40 mi50 min WSW 1.9 G 5.1 40°F 39°F1011.5 hPa
SLIM2 - 8577330 - Solomons Island, MD 45 mi44 min Calm G 1 39°F 42°F1012.4 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA4 mi70 minN 010.00 miMostly Cloudy38°F34°F86%1012.4 hPa
Camp Springs / Andrews Air Force Base, MD9 mi66 minN 010.00 miA Few Clouds37°F28°F70%1012.7 hPa
Fort Belvoir, VA9 mi66 minN 010.00 miFair30°F27°F91%1012.8 hPa
College Park Airport, MD14 mi74 minN 010.00 miOvercast40°F26°F59%1012.2 hPa
Fort Meade / Tipton, MD24 mi74 minWSW 410.00 miOvercast36°F32°F87%1013.2 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrNE9NE7SW3W5W5W8W6NW13
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NW6NW11NW10NW7N7N3NW4NW6NW10NW5NW6CalmCalmSE3CalmS6
1 day agoE5NE6NE7NE6E5CalmE6E8E6E7NE6NE7E10E9
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2 days agoCalmNE3CalmCalmE4CalmCalmCalmCalmS4CalmCalmE6CalmCalmCalmNE6NE3NE4NE5NE4NE6N4NE5

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Sun -- 03:37 AM EST     -0.19 feet Low Tide
Sun -- 07:19 AM EST     Sunrise
Sun -- 08:37 AM EST     Moonrise
Sun -- 09:13 AM EST     2.47 feet High Tide
Sun -- 03:39 PM EST     -0.19 feet Low Tide
Sun -- 05:22 PM EST     Sunset
Sun -- 07:09 PM EST     Moonset
Sun -- 09:31 PM EST     2.67 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.30.80.3-0.1-0.20.311.72.22.52.31.91.20.70.2-0.1-0.20.211.72.32.62.62.2

Tide / Current Tables for Fort Washington, Maryland
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Fort Washington
Click for Map
Sun -- 03:22 AM EST     -0.17 feet Low Tide
Sun -- 07:18 AM EST     Sunrise
Sun -- 08:37 AM EST     Moonrise
Sun -- 08:58 AM EST     2.18 feet High Tide
Sun -- 03:24 PM EST     -0.16 feet Low Tide
Sun -- 05:22 PM EST     Sunset
Sun -- 07:09 PM EST     Moonset
Sun -- 09:16 PM EST     2.35 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.10.60.2-0.1-0.10.411.622.221.510.50.1-0.1-0.10.311.72.12.32.31.9

Weather Map
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wmap_A
GEOS Local Image of    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 (6,6,7,8)
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Ground Weather Radar Station Sterling, VA
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weather_mapweather_map weather_map

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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 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.