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Marine Weather and Tides National Harbor, MD Version 3.4

NOTICE 1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17. 1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

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Sunrise 6:29AM

Sunset 6:08PM

Sunday March 7, 2021 3:38 PM EST (20:38 UTC)

Moonrise 2:49AM

Moonset 12:13PM

Illumination 33%

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 071938 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 238 PM EST Sun Mar 7 2021

SYNOPSIS. A strong area of Canadian high pressure will continue to expand across the area through Monday before drifting offshore during the middle of the week. A cold front is expected to slowly approach from the north toward the end of the week.

NEAR TERM /THROUGH TONIGHT/. Northwest flow continues today, with below average temperatures continuing for this afternoon. High pressure is located just to our northwest, and will move directly overhead tonight. This has left very little in the way of cloud cover across the region.

The stubborn upper trough that has influenced our weather over the past several days will finally press offshore tonight. High pressure at the surface will follow within the zone of subsidence behind it. Temperatures will be quite cold tonight, with lows into the teens for most, except for the densely populated metro areas, which stay in the mid 20s. The more rural zones and sheltered valleys will get quite cold tonight as winds subside and clear skies prevail. One of the cooler nights this winter (even though it is almost spring . ).

SHORT TERM /MONDAY THROUGH TUESDAY NIGHT/. Dry weather will continue for Monday and Tuesday, but with a very noticeable warming trend across the region. High pressure will slide by overhead during the day Monday, then offshore Monday night into Tuesday. Highs on Monday will be closer to seasonal averages, with low to mid 50s expected. For Tuesday, with high pressure offshore and southerly flow taking hold at the surface, highs soar into the mid to upper 60s. There may be a few more passing clouds on Tuesday as a very weak disturbance approaches from the west, but overall more sunshine than clouds is still expected.

LONG TERM /WEDNESDAY THROUGH SATURDAY/. High pressure is forecast to have moved well offshore by Wednesday as a strong upper-level ridge builds across the eastern United States. Southwesterly return flow is expected to push temperatures to 15 to 20 degrees above normal during the second half of the week, possibly approaching 70 degrees during the afternoon hours at times.

A few clouds are possible as a weak upper-level disturbance in the jet stream crosses Thursday, but otherwise dry and mainly clear conditions are forecast until a cold front approaches toward the end of the week. Some showers may accompany this front, but there is uncertainty in how much forcing and moisture will be available given downsloping low-level flow having a drying effect off the mountains.

There is uncertainty in the front's position by the upcoming weekend, with some solutions pushing the front far enough south to keep us dry and cooler, with other solutions hanging the front up overhead with lingering precipitation chances.

AVIATION /19Z SUNDAY THROUGH FRIDAY/. Some brief 20 knot wind gusts possible this afternoon across our northern terminals (so excluding CHO). Other than that, VFR condtions will continue through Friday. Light winds expected tonight through Tuesday. Wind directions out of the northwest today will become more light and variable Monday, then turning out of the southwest on Tuesday.

For Wed-Fri, S/SW flow 10-15G20-25kt during the day, generally near or below 10 kt with fewer gusts at night.

MARINE. Brief gusty winds this afternoon have lead to a Small Craft Advisory for portions of the tidal Potomac. Elsewhere on the waters, don't be surprised to see some gusts close to 18 knots, but should generally fall just shy of SCA criteria.

Beyond that, winds will taper off this evening through Tuesday, with no additional marine hazards anticipated at this time.

Small Craft Advisory conditions are possible in southwesterly flow during the second half of the week, but warmer air moving over cooler water may result in poor mixing.

FIRE WEATHER. A dry airmass will remain in place through the middle of the week. Relative humidity values could reach the 20s and 30s over portions of the area each day through Wednesday, but winds will generally be less than 15 mph. Winds may be a little stronger Thursday, though humidity will also be increasing.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 PM EST this evening for ANZ535- 536.

SYNOPSIS . DHOF NEAR TERM . CJL SHORT TERM . KJP LONG TERM . DHOF AVIATION . DHOF/CJL MARINE . DHOF/CJL FIRE WEATHER .

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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	51 min	WNW 11 G 20	45°F	43°F		1027.5 hPa
BSLM2 - Chesapeake Bay, MD	17 mi	69 min	NE 5.1	45°F			1026 hPa	13°F
APAM2 - 8575512 - Annapolis, MD	32 mi	51 min	WNW 11 G 13	42°F	40°F		1026.6 hPa
TPLM2 - Thomas Point, MD	32 mi	39 min	NE 6 G 6	39°F	40°F		1028 hPa (-1.6)	14°F
NCDV2	33 mi	51 min	NNW 5.1 G 11	46°F	42°F		1026.7 hPa
44062 - Gooses Reef, MD	37 mi	33 min	E 3.9 G 3.9	38°F	40°F		1027.6 hPa
CPVM2	37 mi	51 min		41°F				20°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	39 mi	51 min	NNW 5.1 G 8.9	42°F			1027.1 hPa
FSNM2	39 mi	51 min	NW 7 G 9.9	41°F			1026.4 hPa
BLTM2 - 8574680 - Baltimore, MD	40 mi	51 min	N 7 G 11	42°F	41°F		1026.6 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD	44 mi	51 min	N 7 G 9.9	38°F			1027.9 hPa
SLIM2 - 8577330 - Solomons Island, MD	45 mi	51 min	E 4.1 G 8.9	41°F	42°F		1026.9 hPa

Wind History for Washington, DC

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

3 PM

4 PM

5 PM

6 PM

7 PM

8 PM

9 PM

10 PM

11 PM

12 AM

1 AM

2 AM

3 AM

4 AM

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6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

Last 24hr

NW7 G10

NW10 G13

NW7 G12

NW6 G16

N4 G13

N5 G9

N4

N4 G9

N3

NE2

E1

N2

NW4

NW6 G9

W3

W3 G6

NW6 G9

NW5

NW7 G14

NW6 G10

NW10 G19

NW7 G11

NW7 G10

NW11 G20

1 day ago

NW11 G19

NW13 G19

NW9 G20

NW10 G14

NW7 G11

NW2 G5

NW1

NW3

NW4 G7

NW7 G12

NW11 G16

W7 G11

W5

W3

W3

W4 G8

W3

W3

NW11 G19

NW9 G14

NW7 G12

NW11

NW10 G15

NW8 G15

2 days ago

NW11 G21

NW10 G19

NW11 G20

N10 G19

NW10 G20

NW11 G18

NW6 G17

NW9 G18

NW9 G14

NW8 G14

NW8 G17

NW10 G13

NW7 G13

NW10 G17

NW8 G14

NW8 G12

NW10 G17

NW12 G20

NW11 G17

NW13 G16

NW11 G18

NW13 G16

NW12 G18

NW13 G18

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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	47 min	NNW 10	10.00 mi	Fair	47°F	13°F	25%	1027.5 hPa
Camp Springs / Andrews Air Force Base, MD	9 mi	43 min	NW 10	10.00 mi	Fair	45°F	11°F	25%	1027.4 hPa
Fort Belvoir, VA	9 mi	43 min	NW 13 G 17	10.00 mi	Fair	46°F	10°F	22%	1027.8 hPa
College Park Airport, MD	14 mi	44 min	NNW 8	10.00 mi	Fair	44°F	5°F	19%	1027.1 hPa
Fort Meade / Tipton, MD	24 mi	44 min	NW 8	10.00 mi	Fair	45°F	14°F	29%	1027.8 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)

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Last 24hr

NW11 G22

NW10 G23

NW12

N9

N6

N14

NE8

N7

NE6

Calm

E3

NW6

NW9

NW5

W4

N6

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NW6

NW12

NW8 G15

NW7 G19

NW11 G15

NW16 G24

N10

1 day ago

NW17 G27

NW17 G28

NW13 G19

NW8

NW7

W5

W4

NW7

NW13 G19

NW9 G18

W7

SW6

W4

W5

SW4

S3

5

NW11 G18

NW13

W10 G17

NW11 G19

W12 G25

NW11 G16

NW9

2 days ago

NW18 G32

NW16 G32

NW16 G24

NW16 G21

NW18 G27

NW19 G33

NW11 G23

NW16 G27

NW16 G24

NW11 G22

NW14 G21

NW15

NW13

NW9

NW9

NW12 G21

NW10 G21

NW13 G24

NW16 G23

W12 G21

W14 G25

NW14 G20

W18 G26

NW17 G30

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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: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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Ground Weather Radar Station

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