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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.

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Sunrise 7:17AM

Sunset 5:23PM

Sunday January 26, 2020 6:01 AM EST (11:01 UTC)

Moonrise 8:37AM

Moonset 7:09PM

Illumination 2%

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.

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7 Day Forecast for Marine Location Near National Harbor, MD

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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

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
WASD2 - 8594900 - Washington, DC	5 mi	44 min	S 1.9 G 2.9	39°F	40°F		1012.5 hPa
BSLM2 - Chesapeake Bay, MD	17 mi	152 min	Calm				1012 hPa
APAM2 - 8575512 - Annapolis, MD	32 mi	44 min		41°F			1011.6 hPa
TPLM2 - Thomas Point, MD	32 mi	62 min	SW 5.1 G 5.1	40°F	40°F		1013.1 hPa (+0.0)	30°F
NCDV2	33 mi	50 min	WSW 1 G 1.9	41°F	43°F		1012 hPa
CPVM2	37 mi	50 min		42°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	39 mi	44 min	WSW 8 G 8.9	40°F			1012 hPa
FSNM2	39 mi	56 min	WSW 14 G 15	42°F			1011.4 hPa
BLTM2 - 8574680 - Baltimore, MD	40 mi	50 min	WSW 1.9 G 5.1	40°F	39°F		1011.5 hPa
SLIM2 - 8577330 - Solomons Island, MD	45 mi	44 min	Calm G 1	39°F	42°F		1012.4 hPa

Wind History for Washington, DC

(wind in knots)    EDIT      (on/off)   Help

6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

3 PM

4 PM

5 PM

6 PM

7 PM

8 PM

9 PM

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12 AM

1 AM

2 AM

3 AM

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5 AM

Last 24hr

N4 G7

NE3 G7

E3 G6

NW3

SW3

W4

NW5 G8

W5

NW6 G11

NW6

NW6 G11

NW5 G12

NW1 G4

NW4 G8

NW1

NW1

NW4

NW4

NW3

NW4 G7

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W1

NW3 G7

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1 day ago

NE2

NE2

NE4 G7

NE3 G7

NE3 G7

E1 G6

E3 G6

E2 G5

SE4 G9

E3 G7

NE3

NE4 G8

E2 G6

E5

E3 G9

NE5 G8

NE5 G11

E3 G6

E7 G13

E4 G9

E3 G10

W3

E6 G10

NW3 G11

2 days ago

W1

--

SW2

SE2

SW1

S3

S1

NE2

SW2

S2

S1

SE1

E1

E3 G6

SE1 G4

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--

NE2 G6

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SE2

NE2

E3

NE1 G4

NE4

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Washington/Reagan National Airport, DC, VA	4 mi	70 min	N 0	10.00 mi	Mostly Cloudy	38°F	34°F	86%	1012.4 hPa
Camp Springs / Andrews Air Force Base, MD	9 mi	66 min	N 0	10.00 mi	A Few Clouds	37°F	28°F	70%	1012.7 hPa
Fort Belvoir, VA	9 mi	66 min	N 0	10.00 mi	Fair	30°F	27°F	91%	1012.8 hPa
College Park Airport, MD	14 mi	74 min	N 0	10.00 mi	Overcast	40°F	26°F	59%	1012.2 hPa
Fort Meade / Tipton, MD	24 mi	74 min	WSW 4	10.00 mi	Overcast	36°F	32°F	87%	1013.2 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)

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Last 24hr

NE9

NE7

SW3

W5

W5

W8

W6

NW13 G22

NW6

NW11

NW10

NW7

N7

N3

NW4

NW6

NW10

NW5

NW6

Calm

Calm

SE3

Calm

S6

1 day ago

E5

NE6

NE7

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E5

Calm

E6

E8

E6

E7

NE6

NE7

E10

E9 G17

NE9

E11 G17

E7

E12

E12

E10

Calm

E13

NW10 G17

N8

2 days ago

Calm

NE3

Calm

Calm

E4

Calm

Calm

Calm

Calm

S4

Calm

Calm

E6

Calm

Calm

Calm

NE6

NE3

NE4

NE5

NE4

NE6

N4

NE5

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Tide / Current Tables for Alexandria, Virginia

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Tide / Current Tables for Fort Washington, Maryland

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Weather Map

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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

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Wind Forecast for Baltimore, MD/Washington (6,6,7,8)

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Ground Weather Radar Station Sterling, VA

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