Thursday, January23, 2020
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Marine Weather and Tides
Shenandoah, VA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
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.

Sunrise 7:26AMSunset 5:28PM Thursday January 23, 2020 5:39 AM EST (10:39 UTC) Moonrise 6:37AMMoonset 4:18PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 338 Am Est Thu Jan 23 2020
Rest of the overnight..N winds 5 kt. Waves flat.
Today..SE winds around 5 kt. Waves flat.
Tonight..NE winds around 5 kt. Waves 1 ft.
Fri..E winds 5 to 10 kt. Waves 1 ft.
Fri night..E winds 5 to 10 kt. Waves 1 ft. Rain.
Sat..S winds 5 kt...becoming W in the afternoon. Waves 1 ft. Showers likely.
Sat night..W winds 5 to 10 kt. Waves 1 ft.
Sun..W winds 5 to 10 kt. Waves 1 ft.
Mon..NW winds 5 to 10 kt. Waves 1 ft.
ANZ500 338 Am Est Thu Jan 23 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain overhead, then slowly drift offshore by Friday. A low pressure system will approach on Saturday. Small craft advisories may be needed Friday night through Sunday.


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 230905 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 405 AM EST Thu Jan 23 2020

SYNOPSIS. High pressure continues to maintain control of the region and will gradually transition offshore by Friday. Low pressure will approach the region from the Midwest by Friday, before slowly moving northward towards New England during the second half of the weekend. High pressure returns Sunday and lingers into early next week.

NEAR TERM /THROUGH TONIGHT/. High pressure is sitting overhead this morning allowing for light winds across our region while high level clouds move in from the west. Aloft, mid to upper level ridge axis will shift east and away from us as surface high moves offshore through the day today. Conditions will continue to be dry with light winds today with high temperatures around the mid 40s.

A surface low pressure system and mid level cutoff low will be moving northeast into the Ohio Valley today and into tonight. Clouds will increase across our area through the day today and into tonight. Precipitation will be approaching from the SW of our CWA late tonight. If it makes it to our CWA, p-type will be in the form of snow or freezing rain, mainly over the lower section of the Potomac Highlands.

SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/. The low pressure and the mid level cutoff low will be moving east across the Ohio Valley on Friday. Precipitation associated to this system will be approaching our region Friday morning. Depending on the timing, wintry precipitation could take place, mainly over areas west of the Blue Ridge, but most high-res guidance moves the precipitation late Friday morning over our western zones. As the system keeps moving east precipitation will overspread across our region in the form of rain as temperatures remain in the 40s across most of our region. Moderate to heavy rain is possible at times.

A secondary low pressure will develop overhead on Friday night and will move NE and away from us Saturday into Saturday night. Precipitation will continue during this time with plenty of lift over us as frontal boundary moves across late Friday night. Rain will continue over most areas, but some snow is also possible over higher elevations. Total QPF values are near an inch across most of our CWA, with higher elevations near 2 inches. Precipitation will gradually decrease on Saturday from west to east behind the front, but upslope snow will continue through Saturday night.

LONG TERM /SUNDAY THROUGH WEDNESDAY/. By Sunday low pressure, both surface and aloft, will be migrating toward New England. The forecast area will be experiencing northwest flow with scattered upslope snow showers Sunday and Sunday night . possibly extending into Monday. Winds will be on the gusty side as well, especially during the daytime hours when cold advection will have a better chance to mix to the surface.

Tuesday into Wednesday will be the lull when a ridge axis passes across the eastern CONUS. Thereafter, another transitory upper level closed low and surface reflection will approach at the end of the forecast period. Its too soon to get caught up in the details for this system.

AVIATION /09Z THURSDAY THROUGH MONDAY/. VFR conditions will continue through Friday as high pressure moves offshore with light and variable winds. High level clouds are moving in this morning, and CIGs will be decreasing Thursday night with some terminals possibly reaching MVFR conditions. Low pressure system will approach from the west Friday and will move overhead Friday night into Saturday. This system will bring rain across our area, which will be heavy at times. Periods of reduced VSBYs and CIGS are anticipated Friday into Saturday. Winds will be increasing Friday night and remain breezy into Saturday night, gusts up to 20 knots. Conditions will improve Saturday afternoon into the night.

VFR should prevail across the terminals Sunday and Monday. Winds will be from the west/northwest, with 20-25 kt gusts Sunday resulting in the bigger operational impact.

MARINE. Winds will remain light across our region today and through Friday with high pressure in control. Periods of SCA conditions possible Friday night into Saturday night with low pressure impacting our area.

Small Craft Advisory possible Sunday (and maybe into Monday) in cold northwest flow permitting 20+ kt gusts to mix to the water's surface.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . None.

SYNOPSIS . MSS/HTS NEAR TERM . IMR SHORT TERM . IMR LONG TERM . HTS AVIATION . IMR/HTS MARINE . IMR/HTS


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 90 mi51 min S 1.9 G 1.9 29°F 40°F1030 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Staunton / Shenandoah, VA18 mi64 minN 010.00 miFair17°F13°F87%1028.1 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
Click for Map
Thu -- 12:44 AM EST     -0.28 feet Low Tide
Thu -- 05:57 AM EST     2.48 feet High Tide
Thu -- 06:31 AM EST     Moonrise
Thu -- 07:21 AM EST     Sunrise
Thu -- 12:44 PM EST     -0.21 feet Low Tide
Thu -- 04:14 PM EST     Moonset
Thu -- 05:21 PM EST     Sunset
Thu -- 06:16 PM EST     2.86 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.1-0.30.211.72.32.52.31.71.20.70.2-0.1-0.20.21.11.92.52.82.82.31.81.30.8

Tide / Current Tables for Massaponax, Rappahannock River, Virginia
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Massaponax
Click for Map
Thu -- 01:00 AM EST     -0.25 feet Low Tide
Thu -- 05:48 AM EST     2.17 feet High Tide
Thu -- 06:31 AM EST     Moonrise
Thu -- 07:21 AM EST     Sunrise
Thu -- 01:00 PM EST     -0.19 feet Low Tide
Thu -- 04:14 PM EST     Moonset
Thu -- 05:21 PM EST     Sunset
Thu -- 06:07 PM EST     2.50 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0-0.20.10.81.522.21.91.510.60.3-0-0.20.10.81.62.22.52.421.61.10.7

Weather Map
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wmap_A
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
Wind Forecast for Baltimore, MD/Washington (5,6,7,8)
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Ground Weather Radar Station Sterling, VA
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.