Tuesday, January26, 2021
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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.

Sunrise 7:17AMSunset 5:24PM Tuesday January 26, 2021 10:07 PM EST (03:07 UTC) Moonrise 3:15PMMoonset 5:48AM Illumination 99% Phase: Waxing Gibbous; Moon at 14 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- 940 Pm Est Tue Jan 26 2021
Rest of tonight..W winds 5 kt. Waves less than 1 ft. Patchy fog. Vsby 1 to 3 nm...decreasing to 1 nm or less.
Wed..NW winds 5 to 10 kt. Waves 1 ft. Patchy fog. Vsby 1 to 3 nm.
Wed night..N winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Thu..NW winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
Thu night..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Fri..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Fri night..NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sat..E winds around 5 kt. Waves 1 ft.
Sun..NE winds 5 kt. Waves less than 1 ft. A chance of snow. A chance of rain.
ANZ500 940 Pm Est Tue Jan 26 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will move offshore today. High pressure will briefly return Wednesday, but low pressure may impact the waters Wednesday night and Thursday. High pressure will return late in the week. Small craft advisories will be required for portions of the waters Wednesday night through Friday, with the potential for gales on Thursday, possibly into Friday morning.


7 Day Forecast for Marine Location Near Arlington, VA
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location: 38.87, -77.06     debug


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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 2 mi427 min NE 1 G 2.9 36°F 39°F1010.6 hPa (-2.0)
BSLM2 - Chesapeake Bay, MD 20 mi457 min ENE 1 35°F 1009 hPa35°F
APAM2 - 8575512 - Annapolis, MD 32 mi427 min NW 1.9 G 2.9 36°F 39°F1009.3 hPa (-2.1)
TPLM2 - Thomas Point, MD 33 mi427 min NNW 4.1 G 5.1 35°F 39°F1010.7 hPa (-1.7)35°F
BLTM2 - 8574680 - Baltimore, MD 37 mi427 min E 1.9 G 6 35°F 40°F1009.5 hPa (-2.2)
CPVM2 37 mi427 min 36°F 35°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi427 min ENE 1.9 G 2.9 35°F 1010 hPa (-2.2)
FSNM2 37 mi427 min NNE 2.9 G 5.1 35°F 1009.3 hPa (-2.2)
NCDV2 38 mi427 min NNW 1.9 G 1.9 37°F 39°F1009.7 hPa (-1.6)
44062 - Gooses Reef, MD 40 mi415 min NNE 5.8 G 7.8 36°F 41°F991.5 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi427 min NNW 6 G 8 36°F 1010.5 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 49 mi427 min Calm G 2.9 36°F 40°F1010.1 hPa (-1.9)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi75 minN 04.00 miLight Drizzle Fog/Mist37°F36°F96%1012.4 hPa
College Park Airport, MD11 mi72 minN 04.00 miOvercast35°F32°F91%1012.2 hPa
Gaithersburg - Montgomery County Airport, MD21 mi71 minN 03.00 miFog/Mist34°F32°F92%1013.3 hPa
Fort Meade / Tipton, MD22 mi72 minN 01.25 miOvercast34°F34°F100%1012.9 hPa
Washington/Dulles International Airport, DC, VA22 mi75 minN 00.50 miFog/Mist35°F35°F100%1012 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hr--NE9NE7NE5NE7NE6E3E4NE5NE3NE5NE4NE3NE3CalmCalmNE3NE4NE3NE4N5N4CalmSW3
1 day agoS3SE4SE3SE3SE3E3E5E4NE4NE6E6NE8NE6NE6E6E4NE5NE8NE9E5E4NE7E7NE7
2 days agoNW15
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Tide / Current Tables for Washington, D.C.
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Washington
Click for Map
Tue -- 12:55 AM EST     0.03 feet Low Tide
Tue -- 05:48 AM EST     Moonset
Tue -- 06:16 AM EST     2.25 feet High Tide
Tue -- 07:18 AM EST     Sunrise
Tue -- 12:40 PM EST     -0.00 feet Low Tide
Tue -- 03:14 PM EST     Moonrise
Tue -- 05:22 PM EST     Sunset
Tue -- 06:22 PM EST     2.63 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.200.30.91.522.22.21.81.20.70.3000.311.82.42.62.62.21.71.20.7

Tide / Current Tables for Fort Washington, Maryland
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Fort Washington
Click for Map
Tue -- 12:23 AM EST     0.02 feet Low Tide
Tue -- 05:47 AM EST     Moonset
Tue -- 06:09 AM EST     1.98 feet High Tide
Tue -- 07:18 AM EST     Sunrise
Tue -- 12:08 PM EST     -0.00 feet Low Tide
Tue -- 03:15 PM EST     Moonrise
Tue -- 05:23 PM EST     Sunset
Tue -- 06:15 PM EST     2.31 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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00.10.411.51.821.91.50.90.50.1-00.10.51.11.72.12.32.21.91.40.90.5

Weather Map
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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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