Monday, March8, 2021
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Marine Weather and Tides
Shenandoah, 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 6:35AMSunset 6:17PM Monday March 8, 2021 10:21 AM EST (15:21 UTC) Moonrise 3:54AMMoonset 1:22PM Illumination 25% Phase: Waning Crescent; Moon at 25 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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ANZ536 Tidal Potomac From Indian Head To Cobb Island- 941 Am Est Mon Mar 8 2021
Rest of today..NW winds 5 to 10 kt...becoming sw late. Waves 1 ft.
Tonight..SW winds around 5 kt. Waves 1 ft.
Tue..SW winds 5 kt. Waves less than 1 ft.
Tue night..SE winds around 5 kt. Waves 1 ft or less.
Wed..S winds 5 to 10 kt. Waves 1 ft.
Wed night..S winds 5 to 10 kt. Waves 1 ft.
Thu..SW winds 5 to 10 kt. Waves 1 ft.
Fri..W winds 5 to 10 kt. Waves 1 ft.
ANZ500 846 Am Est Mon Mar 8 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build overhead today, then gradually migrate offshore during the middle of the week. A cold front will approach from the northwest Friday. Small craft advisories may be needed for portions of the waters Wednesday night through Friday morning.


7 Day Forecast for Marine Location Near Shenandoah, VA
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location: 38.48, -78.64     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 081509 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 1009 AM EST Mon Mar 8 2021

SYNOPSIS. High pressure will continue to build overhead today, before shifting offshore during the middle of the week. A cold front will approach from the north and then pass through the area toward the end of the week.

NEAR TERM /THROUGH TONIGHT/. 10:00 AM UPDATE: Temperatures have jumped up rather quickly this morning, reaching the low to mid 30s for much of the region at this time. This, after reaching the mid to upper teens overnight. Temperatures will continue to rise today, reaching into the mid 50s. This is much more normal for this time of the year compared to previous days. With high pressure directly overhead today, don't expect to see too much in the way of cloud cover. Though, it is possible a few mid-level swing through this afternoon across our north, but should still be mostly sunny overall. Did bump winds up a touch this afternoon across portions of the area, so could see gusts up to 15 to 20 mph perhaps in a few spots across northern VA and central MD.

PREVIOUS DISCUSSION: High pressure will settle to our south and east tonight, leading to another night with mostly clear skies and light winds. Lows overnight will be warmer than preceding nights, with most locations bottoming out in the 30s (around 40 in downtown DC and Baltimore).

SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/. Our stretch of quiet weather conditions will continue through mid- week. High pressure will shift offshore and flow aloft will become zonal in nature. A weak disturbance embedded in zonal flow will pass through Tuesday Night, but won't produce anything more than some high clouds. Otherwise, mostly sunny skies are forecast for both Tuesday and Wednesday. A notable warming trend will occur as warmer air advects into the region on the back side of the high. High temperatures will make it well into the 60s across the area on Tuesday, and could even make a run at 70 across the southeastern half of the forecast area. Temperatures should be even a few degrees warmer on Wednesday, with highs in the upper 60s and lower 70s for most. With relatively dry air in place, and mainly clear skies, temperatures will still be able to drop back into the 30s and lower 40s Tuesday night. Wednesday night will be a bit warmer, with lows in the 40s.

LONG TERM /WEDNESDAY THROUGH SUNDAY/. High pressure will be offshore Thursday, with low pressure near the Canadian Maritimes and a trailing cold front across the Great Lakes. As the jet stream shifts southward, some additional mid and high level cloudiness can be expected, but gusty southwesterly surface winds will help much of the area reach well into the 60s to mid 70s . around 20 degrees above normal.

The front will slowly settle toward the area Thursday night into Friday. With the primary upper level forcing departing well to the northeast and a westerly/downsloping component to the low level winds, precipitation could be difficult to come by east of the mountains. Cold advection likely will hold off through the day as well, so most areas will reach the 60s and 70s again.

The front will stall near or just south of the area Friday night into Saturday. A wave of low pressure may track along the front Saturday, which could bring a better chance of rain, though the exact placement is still in question. Temperatures will be a little cooler, though they should remain above normal.

The front may push south by Sunday as strong high pressure builds over the Great Lakes. This would result in a dry day with near normal temperatures. However, ensembles show the front could still linger nearby, so some small chances of rain remain in the forecast.

AVIATION /15Z MONDAY THROUGH FRIDAY/. VFR conditions and light winds are expected at the terminals through Wednesday. Winds will be predominantly out of the west today into tomorrow, before turning more southerly on Wednesday.

VFR conditions expected Thursday and Friday. Southwest winds could gust above 20kt at times Thursday. A cold front will approach Friday, but precipitation chances are limited.

MARINE. A Marine Weather Statement has been issued for the northern neck of the tidal Potomac through early this afternoon. Could potentially see some wind gusts close to 20 knots, but should be very isolated in nature.

Otherwise, predominantly sub-SCA level winds are expected over the waters through Wednesday. Winds will be westerly today into tomorrow, before turning southerly on Wednesday. Winds may also be southerly for a brief time tonight. Channeling could lead to marginal SCA conditions on the Bay by Wednesday night.

Southwesterly flow continues Thursday. Marginal SCA conditions are possible, though very warm air over the colder waters will likely inhibit efficient mixing of stronger winds aloft. A cold front will approach Friday, and winds should lessen a bit as high pressure moves farther away.

FIRE WEATHER. A dry airmass will remain in place through the middle of the week. Relative humidity values could reach the 20s and 30s (and possibly teens this afternoon) over portions of the area each day through Wednesday, but winds will generally be less than 15 mph. While critical fire weather conditions are unlikely, the continued sunshine, low humidity, increasing temperatures, and daily breezes will help fuels continue to dry out. 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 . None.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 90 mi52 min NW 6 G 12 40°F 43°F1034.2 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Staunton / Shenandoah, VA18 mi27 minN 010.00 miFair39°F17°F40%1033.2 hPa

Link to 5 minute data for KW45

Wind History from W45 (wind in knots)
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Last 24hrCalmN5S3CalmS6S4S6N8NW16
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CalmN6N3NE3N3CalmN5N8
1 day agoN3Calm----CalmCalmCalmCalmCalmSW5CalmE4CalmCalmCalmS4CalmCalmCalmCalmCalmSE6CalmCalm
2 days agoNW8N6N7
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S4S3CalmCalmCalmCalmCalmS4NW3CalmCalm

Tide / Current Tables for Fredericksburg, Rappahannock River, Virginia
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Fredericksburg
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Mon -- 02:47 AM EST     2.62 feet High Tide
Mon -- 03:48 AM EST     Moonrise
Mon -- 06:31 AM EST     Sunrise
Mon -- 09:32 AM EST     0.23 feet Low Tide
Mon -- 01:17 PM EST     Moonset
Mon -- 03:07 PM EST     2.96 feet High Tide
Mon -- 06:10 PM EST     Sunset
Mon -- 10:33 PM EST     0.16 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.52.12.52.62.41.91.30.90.50.30.30.71.52.32.732.82.41.91.510.60.20.2

Tide / Current Tables for Massaponax, Rappahannock River, Virginia
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Massaponax
Click for Map
Mon -- 02:38 AM EST     2.29 feet High Tide
Mon -- 03:47 AM EST     Moonrise
Mon -- 06:30 AM EST     Sunrise
Mon -- 09:48 AM EST     0.20 feet Low Tide
Mon -- 01:17 PM EST     Moonset
Mon -- 02:58 PM EST     2.58 feet High Tide
Mon -- 06:10 PM EST     Sunset
Mon -- 10:49 PM EST     0.14 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.21.82.22.321.61.20.80.50.30.20.51.222.42.62.42.11.71.30.90.60.30.1

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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