Sunday, December15, 2019
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Marine Weather and Tides
Woodstock, 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

Sunrise 7:23AMSunset 4:52PM Sunday December 15, 2019 12:20 AM EST (05:20 UTC) Moonrise 8:33PMMoonset 10:29AM Illumination 88% Phase: Waning Gibbous; Moon at 18 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- 936 Pm Est Sat Dec 14 2019
.small craft advisory in effect until 1 am est Sunday...
.small craft advisory in effect from Sunday morning through Sunday afternoon...
Rest of tonight..W winds 10 kt. Gusts up to 25 kt late this evening and early morning. Waves 1 ft.
Sun..W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Sun night..NE winds 5 to 10 kt. Waves 1 ft. A chance of snow or sleet.
Mon..E winds 5 kt. Waves less than 1 ft. Rain or snow likely.
Mon night..SE winds 5 kt. Waves less than 1 ft. Rain likely.
Tue..W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. Rain likely.
Tue night..NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Wed..NW winds 5 to 10 kt. Waves 1 ft.
Thu..W winds around 5 kt. Waves 1 ft.
ANZ500 936 Pm Est Sat Dec 14 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure will continue to intensify as it moves off well to the northeast overnight. High pressure will briefly build overhead for Sunday before low pressure impacts the area Monday. The cold front associated with this low will pass through Tuesday. Small craft advisories may be required on Tuesday.


7 Day Forecast for Marine Location Near Woodstock, VA
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location: 38.95, -78.64     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 150130 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 830 PM EST Sat Dec 14 2019

SYNOPSIS. Low pressure will continue to move away from the region tonight. High pressure will briefly build overhead for Sunday before low pressure impacts the area Monday. The cold front associated with this low will pass through Tuesday. Canadian high pressure will build overhead for Wednesday through Thursday.

NEAR TERM /UNTIL 6 AM SUNDAY MORNING/. An upper-level trough will continue to lift northeast away from the area tonight while high pressure builds over the northern Plains. Surface low pressure associated with the upper-level trough will strengthen as it heads into southeastern Canada. A westerly flow between the low and the high over the northern Plains will usher in drier conditions for most areas, but it will be blustery this evening. Winds should diminish a little in the valleys overnight due to a weak nocturnal inversion.

An upslope component to the low-level wind along with cold advection will produce upslope snow showers along and west of the Allegheny Front. Accumulating snow is expected and the accumulations will be close to advisory levels. Have decided against an advisory since SLR's will be unfavorable and instability is limited underneath the subsidence inversion. Having that been said, snow covered and slippery roads are likely for elevations above 2000 feet along/west of the Allegheny Front.

Min temps will be in the mid to upper 30s for most areas, with 20s on the ridges.

SHORT TERM /6 AM SUNDAY MORNING THROUGH MONDAY NIGHT/. Gusty NW winds Sunday with highs in the 40s with plenty of sunshine in the afternoon. Warm frontal precip associated with next storm system organizing over the mid MS valley will move into western areas after 03Z Mon and spread quickly ewd across the rest of the area after midnight Sun night. With 850 mb low tracking NW of the area, any snow will be brief with a quick transition to mixed p-type early Monday through midday before transitioning to rain for most areas in the afternoon. The best chance for accumulating snow will be northwest of Interstate 95. This will likely impact the morning commute for Monday.

Without a cold sfc high to the north to keep the cold air in place, any mixed p-type is also likely to be brief and light with only trace or light amounts of ice expected. The one exception may be near the Mason-Dixon Line and across the Allegheny and Potomac Highlands. A layer of cold air may be tough to scour out due to light winds underneath the subsidence inversion. Did allow for some more freezing rain across these areas.

Rain/showers will continue off and on through Tue until frontal passage late Tue. Given the expected wintry mix and potential for hazardous travel conditions Monday morning, winter weather advisories are likely to be required for NW parts of the fcst area.

LONG TERM /TUESDAY THROUGH SATURDAY/. Low pressure and its associated cold front will be moving across our area early on Tuesday as mid/upper level trough pushes east into the eastern CONUS. There may be precipitation lingering behind the front, and depending on how fast cold air advects into our region, we may have a change from rain to snow. However there is still uncertainty on this.

Precipitation will be ending later on Tuesday and high pressure will be building into our region on Tuesday night. Snow showers west of the Allegheny Front may remain into Wednesday with dry conditions over the rest of our CWA. High pressure will remain in control through the end of the week.

AVIATION /01Z SUNDAY THROUGH THURSDAY/. Gusty west to northwest winds will turn west to southwest after midnight and they may diminish a bit due to weak nocturnal inversion. However, more gusty west to northwest winds are expected later Sunday morning through Sunday afternoon. Winds relax Sun night and Monday and pick up again Mon night or Tuesday with gusts up to 25-30kt possible. Rain is expected again late Sun night through Monday with snow possible at KMRB for a brief period Monday morning.

Sub-VFR conditions possible on Tuesday with cold front moving through. VFR conditions behind it as high pressure takes over through the end of the week.

MARINE. West to northwest winds will continue through Sunday with gusts around 20 to 25 knots expected. There should be a lull in the gusts overnight into Sunday morning across the upper Tidal Potomac River. Winds relax by early Sun evening. Winds remain below 10 kt Sun night and Mon and increase again Mon night with potential for gales Tuesday.

SCA may be needed Tuesday as cold front moves through, then behind the front on Wednesday. Winds should be on the decrease into Thursday.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Coastal Flood Advisory until 9 PM EST this evening for MDZ014. VA . None. WV . None. MARINE . Small Craft Advisory until 4 PM EST Sunday for ANZ530>533- 538>542. Small Craft Advisory until 2 PM EST Sunday for ANZ534-537-543. Small Craft Advisory until 1 AM EST Sunday for ANZ535-536. Small Craft Advisory from 10 AM to 2 PM EST Sunday for ANZ535- 536.

SYNOPSIS . LFR NEAR TERM . BJL/LFR SHORT TERM . LFR/BJL LONG TERM . IMR AVIATION . BJL/IMR/LFR MARINE . BJL/IMR/LFR


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 86 mi51 min WNW 7 G 18 46°F 43°F1004.5 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure

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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Tide / Current Tables for Aquia Creek, Virginia
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Aquia Creek
Click for Map
Sun -- 02:23 AM EST     0.00 feet Low Tide
Sun -- 07:19 AM EST     Sunrise
Sun -- 07:47 AM EST     1.00 feet High Tide
Sun -- 10:22 AM EST     Moonset
Sun -- 02:24 PM EST     -0.08 feet Low Tide
Sun -- 04:49 PM EST     Sunset
Sun -- 08:24 PM EST     1.37 feet High Tide
Sun -- 08:29 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.200.10.30.60.8110.90.60.40.20.1-0.1-00.20.711.21.41.31.10.8

Tide / Current Tables for Fredericksburg, Rappahannock River, Virginia
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Fredericksburg
Click for Map
Sun -- 04:11 AM EST     -0.15 feet Low Tide
Sun -- 07:19 AM EST     Sunrise
Sun -- 09:10 AM EST     2.58 feet High Tide
Sun -- 10:22 AM EST     Moonset
Sun -- 04:02 PM EST     -0.10 feet Low Tide
Sun -- 04:50 PM EST     Sunset
Sun -- 08:30 PM EST     Moonrise
Sun -- 09:20 PM EST     3.04 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.50.90.40-0.100.71.62.32.62.521.40.90.40-0.10.10.71.72.6332.5

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 (0,6,7,8)
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Ground Weather Radar Station Sterling, VA
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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 numerious 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.