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Marine Weather and Tides Arlington, VA 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

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Sunrise 7:10AM

Sunset 4:47PM

Friday December 6, 2019 5:05 AM EST (10:05 UTC)

Moonrise 1:59PM

Moonset 1:28AM

Illumination 70%

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 Arlington, VA

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Area Discussion for - Baltimore, MD/Washington

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FXUS61 KLWX 060927 CCA AFDLWX

Area Forecast Discussion . Corrected National Weather Service Baltimore MD/Washington DC 400 AM EST Fri Dec 6 2019

SYNOPSIS. High pressure will move offshore from the Carolinas today. A cold front will cross the area this evening. High pressure will follow for the weekend, before a stronger area of low pressure develops over the Mid-Mississippi Valley and tracks northeastward toward the eastern Great Lakes early next week.

NEAR TERM /THROUGH TONIGHT/. High pressure is situated along the southeastern coast this morning, and areas of low pressure are over Michigan and the Arklatex, connected by a cold front. An area of mountain wave cirrus developed last evening and has slowly been eroding, although any clear skies will be replaced by mid/high clouds advancing ahead of the next system.

Moisture ahead of the southern low will intersect the Appalachians by this afternoon, but westerly (downsloping) flow at 850 mb and above will likely mean precipitation will be focused along the Appalachian crest. Warm advection will result in temperatures in the upper 40s to mid 50s, and even on the ridgetops, temperatures should be well above freezing with most of the precipitation being rain. As the cold front sinks southeastward across the area late this afternoon and evening, a few very light showers could be found along it. Used sprinkle wording east of the mountains since the chance of measurable precipitation looks very low in the lowlands.

As cold air advances behind the front, precipitation could end as a little snow on the Allegheny Front. There also could be freezing drizzle as inversion heights crash, but it would be a very brief window and thus didn't put it in the forecast. Skies will clear late tonight with lows in the upper 20s to mid 30s.

SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/. A large/strong area of high pressure originating from Canada will quickly build east Saturday and be overhead by Saturday evening. Cold advection will result in highs in the 40s. Favorable radiational cooling on Saturday night will lead to widespread low to mid 20s, except lower 30s in the cities and by the Bay. The high will move offshore Sunday. Return flow will be offset by increasing clouds and poor mixing, with highs remaining below 50 for most.

A shortwave trough will be approaching from the nation's midsection Sunday night with low pressure developing over the mid Mississippi Valley. Moisture will stream into the area ahead of this system, and there could be additional focus of moisture along an inverted trough along the coast. Chances for rain will increase during the second half of the night. Low temperatures will be above freezing for most areas. However, some of the mountainous areas could be near freezing as the precipitation arrives, so a few pockets of wintry mix are within the realm of possibility if warm advection isn't fast/strong enough.

LONG TERM /MONDAY THROUGH THURSDAY/. High pressure will be centered over the western Atlantic on Monday. Low pressure will be moving NE from the Midwest into the Great Lakes Monday into Monday night as ir deepens. Southerly flow will advect warm and moist air into our region. This will increase the chance for showers over area for Monday.

The cold front associated to this low pressure will be approaching our region Monday night and will move across on Tuesday. Chance of showers will continue during this time and into Tuesday night. Cold air advection and residual moisture behind the front could allow for snow showers over parts of or CWA Tuesday night. Trough axis aloft will move across on Wednesday while surface high pressure starts building east and remains in control through the end of the week.

AVIATION /09Z FRIDAY THROUGH TUESDAY/. Mainly mid/high level clouds today with southwest flow ahead of an approaching cold front. There could be lower ceilings (around 5kft) and a few light showers or sprinkles as the front passes late this afternoon/early evening, but no visibility issues are expected. Winds will shift out of the northwest behind the front and could be briefly gusty to 20-25 kt.

No significant weather Saturday and Sunday with high pressure. Next weather system approaches Sunday night with lowering ceilings (possibly sub-VFR) and a chance of rain.

Chance of precipitation Monday through Tuesday night could bring sub- VFR conditions over the terminals as low pressure and cold front impact our area. Conditions should improve Wednesday when high pressure builds into our region.

MARINE. High pressure will move offshore today with southwest flow increasing. Have not changed the start times of the small craft advisories, which will be in effect for all waters by noon. Worth noting mixing may be poor and gusts sporadic. There could be a brief lull in winds early this evening with decoupling, but then a cold front will pass, winds will shift to the northwest and become gusty. Thus extended the advisory for all waters until 2 AM. Then winds will start diminishing from north to south through Saturday morning as high pressure builds.

Light winds expected Saturday afternoon through Sunday as high pressure builds across the area. Southerly flow may increase a bit Sunday night as the high departs, but looks to be sub- advisory at this time.

Sub-SCA conditions expected Monday into Monday night over the waters. SCA may be needed on Tuesday through Wednesday behind a cold front that will move across our area.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory from noon today to 6 AM EST Saturday for ANZ531-538-539. Small Craft Advisory from 9 AM this morning to noon EST Saturday for ANZ533-534-537-541>543. Small Craft Advisory from noon today to 2 AM EST Saturday for ANZ530-535-536. Small Craft Advisory from 9 AM this morning to 6 AM EST Saturday for ANZ532-540.

SYNOPSIS . ADS NEAR TERM . ADS SHORT TERM . ADS LONG TERM . IMR AVIATION . ADS/IMR MARINE . ADS/IMR

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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	2 mi	59 min	Calm G 1.9	39°F	44°F		1022.1 hPa
BSLM2 - Chesapeake Bay, MD	20 mi	155 min	S 2.9	34°F			1022 hPa	29°F
APAM2 - 8575512 - Annapolis, MD	32 mi	47 min		36°F			1021.1 hPa
44063 - Annapolis	33 mi	29 min	W 5.8 G 7.8	39°F	44°F		1022.2 hPa
TPLM2 - Thomas Point, MD	33 mi	65 min	SSW 8 G 8.9	41°F	45°F		1022.6 hPa (-0.4)	28°F
BLTM2 - 8574680 - Baltimore, MD	37 mi	59 min	WSW 1.9 G 2.9	36°F	49°F		1021.2 hPa
CPVM2	37 mi	47 min		42°F				36°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	37 mi	47 min	WSW 5.1 G 6	37°F			1021.6 hPa
NCDV2	38 mi	59 min	SSW 5.1 G 6	41°F	49°F		1021.4 hPa
44062 - Gooses Reef, MD	40 mi	41 min	SSW 7.8 G 9.7	43°F			1022.8 hPa
TCBM2 - 8573364 - Tolchester Beach, MD	49 mi	59 min	SE 2.9 G 2.9	34°F	43°F		1021.6 hPa

Wind History for Washington, DC

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5 AM

6 AM

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-12 PM

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Last 24hr

NW9 G14

NW8 G13

W7 G10

NW7 G16

NW7 G14

NW6 G14

NW12 G23

NW16 G21

NW8 G14

W10 G17

W10 G16

W6 G15

W3 G6

NW1 G5

NW2

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N1

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S1

S4

S2 G5

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1 day ago

SW5 G9

SW5 G8

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SW4 G8

N2

NW6 G14

NW4 G8

NW5 G10

NW4 G7

NW1

NW4 G10

NW5

W4

W8

W10 G15

NW8 G15

2 days ago

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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	2 mi	73 min	SSW 6	10.00 mi	Partly Cloudy	37°F	30°F	76%	1021.8 hPa
Camp Springs / Andrews Air Force Base, MD	10 mi	69 min	S 5	10.00 mi	Fair	33°F	24°F	69%	1021.9 hPa
College Park Airport, MD	11 mi	69 min	N 0	10.00 mi	Fair	31°F	24°F	77%	1021.7 hPa
Fort Belvoir, VA	12 mi	69 min	N 0	10.00 mi	Overcast	31°F	25°F	81%	1022.3 hPa
Gaithersburg - Montgomery County Airport, MD	21 mi	69 min	N 0	10.00 mi	Fair	29°F	26°F	89%	1023 hPa
Fort Meade / Tipton, MD	22 mi	71 min	N 0	10.00 mi	Fair	28°F	26°F	93%	1022.3 hPa
Washington/Dulles International Airport, DC, VA	22 mi	73 min	N 0	10.00 mi	Overcast	32°F	24°F	73%	1021.6 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)

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Last 24hr

W8

W8

NW5 G15

NW14 G21

W11 G21

W17 G24

W15 G23

W15 G25

W12 G18

NW12 G22

W13 G16

W8 G15

NW7

W7

NW6

NW5

Calm

W4

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1 day ago

SW5

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NW12

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W13 G20

W11 G19

NW10

2 days ago

NW16 G25

NW13 G24

NW18 G24

NW19 G25

NW21 G30

NW17 G25

NW17

NW13 G25

W13

NW10 G20

NW13 G17

NW8

N12

NW10

NW10

N5

N4

NW5

W4

W3

NW6

NW11

Calm

Calm

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Tide / Current Tables for Washington, D.C.

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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 (5,6,7,8)

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Ground Weather Radar Station Sterling, VA

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