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Marine Weather and Tides Arlington, VA 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 7:17AM

Sunset 5:24PM

Tuesday January 26, 2021 10:07 PM EST (03:07 UTC)

Moonrise 3:15PM

Moonset 5:48AM

Illumination 99%

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 270230 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 930 PM EST Tue Jan 26 2021

SYNOPSIS. High pressure will briefly return by Wednesday, but an area of low pressure will graze the area to the south Wednesday night into Thursday. High pressure will briefly return again Friday into Saturday before another storm system approaches for late in the weekend into early next week.

NEAR TERM /THROUGH WEDNESDAY/. Moisture has continued to linger in the lower atmosphere as sampled well by the 00Z upper air from KIAD. It is relatively shallow in nature, generally in the lowest 100 mb (2,000 to 2,500 feet). Consequently, patchy fog has begun to develop in vast sections of northern/central Maryland as well as over areas of northern/central Virginia. While much of this fog has concentrated east of the Blue Ridge and Catoctin Mountains, lower visibility is being observed along I-81. Dense Fog Advisories have been hoisted up response with areas of freezing fog possible as well where surface temperatures continue to hover near freezing. Fog concerns should remain an issue until 9 AM Wednesday. Overnight road conditions are likely to be quite slick with patchy black ice possible as well.

Farther to the west, patchy freezing drizzle, light snow or freezing fog are possible along and west of the Allegheny Front as a weak disturbance interacts with the terrain and lingering moisture overnight.

SHORT TERM /WEDNESDAY NIGHT THROUGH THURSDAY NIGHT/. High pressure will briefly pass near the region Wednesday, but an upper-level trough will approach by Wednesday evening. This trough will spawn a surface low pressure center well to our south, but forcing from the parent trough will likely result in some light snow across the foothills and adjacent valley/piedmont locations of west-central Virginia Wednesday night. Depending on if there is enough forcing and moisture to overcome lower-level dry air, a few flurries or a little light snow may make it as far north as the I-66/US-50 corridor in Virginia and up to near Baltimore in Maryland, but the probabilities here are much lower.

After low pressure departs to our south and east Thursday, a strong northwesterly flow will ensue. Blustery and cold conditions are expected with wind gusts in excess of 30 mph keeping wind chill temperatures in the teens and 20s all day.

LONG TERM /FRIDAY THROUGH TUESDAY/. On Friday, we'll be located between a strong area of low pressure over the Atlantic Ocean and high pressure building into the Great Lakes. Aloft, we'll have strong northwesterly flow, with a potent mid-level disturbance of Arctic origin diving southward off the New England Coast. This disturbance will drive a reinforcing surge of Arctic air into the region, with 850 hPa temps crashing to around, or possibly even below -15 C. Even in a well-mixed airmass, this would only yield daytime highs in the 20s to lower 30s across much of the area. In addition to the cold air, it will be very windy on Friday. Gusts in excess of 30 mph are possible, especially during the morning hours. As a result, wind chills may struggle to reach 20. Overall, it looks like Friday is shaping up to be one of, if not the coldest day we've had locally since 2019.

High pressure will build overhead Friday Night, setting the stage for an ideal radiational cooling night. Lows in the teens appear likely for most, with single digits possible in higher elevation mountain valleys. High pressure will slide offshore during the day Saturday, leading to another day of cold temperatures (highs in the 30s) and quiet weather conditions.

A complex weather system will approach the area during the Sunday into Monday time frame. Both deterministic and ensemble model guidance show a wide range of possible solutions, so confidence in the forecast details during that time period is low. However, with cold air initially in place and strong high pressure to the north, at least some wintry precipitation appears likely on the front end of the system (Sunday into Sunday Night). Looking beyond that initial surge of warm advection precipitation, confidence decreases substantially. Some solutions show a relatively minor event, while others (most notably the deterministic Euro) show a more significant winter storm. We'll continue to monitor this system over the upcoming days.

AVIATION /02Z WEDNESDAY THROUGH SUNDAY/. As moisture has become trapped in the lower levels underneath a developing inversion, fog has begun to develop in areas of the Mid-Atlantic. With little to no wind to chase these lower ceilings and fog out, IFR conditions are likely through the evening and into the early overnight hours. Dense fog is also possible, as is patchy black ice due to temperatures dropping to near or below freezing after 06z. Otherwise, a low ceiling at FL005-010 is forecast to persist through much of the night, and may even drop to LIFR.

Conditions should improve to VFR by midday Wednesday. A disturbance crossing the area may bring some spotty light snow Wednesday night into Thursday morning before clearing by Thursday afternoon. Otherwise, a northwesterly flow is anticipated with a few gusts of 15 to 25 knots possible.

VFR conditions are expected at the terminals on both Friday and Saturday. The wind will be gusty out of the northwest Friday.

MARINE. High pressure briefly building over the region should keep the wind light and variable through early Wednesday. There may be a few northwesterly gusts of 15 to 20 knots during the day on Wednesday as high pressure retreats, but the gradient overall looks marginal. There is a better chance of wind gusts picking up out of the northwest to 20 to 25 knots Wednesday night, increasing further on Thursday to near gale force.

Small Craft Advisories (SCAs) will likely be needed on Friday, with Gale Warnings a possibility. The wind should gradually subside to sub-SCA levels by Saturday morning.

TIDES/COASTAL FLOODING. Tides have become elevated earlier in the day as a result of the relatively calm winds. However, all tidal gauges maximized out at the Action Stage with water levels proceeding to drop overnight. An increasing northwesterly flow beginning early Wednesday will cause water levels to decrease.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Dense Fog Advisory until 9 AM EST Wednesday for MDZ003>005-503- 505. VA . Dense Fog Advisory until 9 AM EST Wednesday for VAZ025-026-028- 030-031-036>040-051-052-501-502-505-506. WV . Dense Fog Advisory until 9 AM EST Wednesday for WVZ051>053. MARINE . None.

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

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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	427 min	NE 1 G 2.9	36°F	39°F		1010.6 hPa (-2.0)
BSLM2 - Chesapeake Bay, MD	20 mi	457 min	ENE 1	35°F			1009 hPa	35°F
APAM2 - 8575512 - Annapolis, MD	32 mi	427 min	NW 1.9 G 2.9	36°F	39°F		1009.3 hPa (-2.1)
TPLM2 - Thomas Point, MD	33 mi	427 min	NNW 4.1 G 5.1	35°F	39°F		1010.7 hPa (-1.7)	35°F
BLTM2 - 8574680 - Baltimore, MD	37 mi	427 min	E 1.9 G 6	35°F	40°F		1009.5 hPa (-2.2)
CPVM2	37 mi	427 min		36°F				35°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	37 mi	427 min	ENE 1.9 G 2.9	35°F			1010 hPa (-2.2)
FSNM2	37 mi	427 min	NNE 2.9 G 5.1	35°F			1009.3 hPa (-2.2)
NCDV2	38 mi	427 min	NNW 1.9 G 1.9	37°F	39°F		1009.7 hPa (-1.6)
44062 - Gooses Reef, MD	40 mi	415 min	NNE 5.8 G 7.8	36°F	41°F		991.5 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD	48 mi	427 min	NNW 6 G 8	36°F			1010.5 hPa
TCBM2 - 8573364 - Tolchester Beach, MD	49 mi	427 min	Calm G 2.9	36°F	40°F		1010.1 hPa (-1.9)

Wind History for Washington, DC

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

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NE3 G8

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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	75 min	N 0	4.00 mi	Light Drizzle Fog/Mist	37°F	36°F	96%	1012.4 hPa
College Park Airport, MD	11 mi	72 min	N 0	4.00 mi	Overcast	35°F	32°F	91%	1012.2 hPa
Gaithersburg - Montgomery County Airport, MD	21 mi	71 min	N 0	3.00 mi	Fog/Mist	34°F	32°F	92%	1013.3 hPa
Fort Meade / Tipton, MD	22 mi	72 min	N 0	1.25 mi	Overcast	34°F	34°F	100%	1012.9 hPa
Washington/Dulles International Airport, DC, VA	22 mi	75 min	N 0	0.50 mi	Fog/Mist	35°F	35°F	100%	1012 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)

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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: 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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