Monday, June26, 2017 L-36.com


Marine Weather and Tides
Hollymead, VA

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:51AMSunset 8:42PM Monday June 26, 2017 4:49 AM EDT (08:49 UTC) Moonrise 7:45AMMoonset 9:58PM Illumination 5% Phase: Waxing Crescent; Moon at 2 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- 431 Am Edt Mon Jun 26 2017
Rest of the overnight..NW winds 10 kt. Waves 1 ft.
Today..W winds 5 to 10 kt. Waves 1 ft.
Tonight..NW winds 5 to 10 kt. Waves 1 ft.
Tue..W winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Tue night..NW winds around 5 kt. Waves 1 ft or less.
Wed..W winds around 5 kt. Waves 1 ft.
Wed night..S winds 5 kt. Waves less than 1 ft.
Thu..SW winds 5 to 10 kt. Waves 1 ft.
Fri..SW winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 431 Am Edt Mon Jun 26 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build west of the area through Tuesday. A weak cold front cross the waters Tuesday. High pressure will move over the area Wednesday before shifting offshore Thursday. Small craft advisory conditions are possible over portions of the waters Tuesday and again Thursday.

7 Day Forecast for Marine Location Near Hollymead, VA
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location: 38.08, -78.42     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 260800
afdlwx
area forecast discussion
national weather service baltimore md washington dc
400 am edt Mon jun 26 2017

Synopsis
High pressure will build west of the area through Tuesday. A
cold front will cross the region Tuesday. High pressure will
move over the region Wednesday and settle offshore late in the
week.

Near term today
As of 3am, an upper trough stretches from the canadian prairies to
the midwest then up over new england per water vapor imagery. A
1024mb surface high is centered over kansas city. This surface high
will drift east to the central mid-atlantic through Tuesday night
before the center moves off the mouth of the chesapeake bay
Wednesday. West flow and cold air advection under the upper trough
will keep temperatures below normal through Wednesday night.

A weak shortwave trough rounds the upper trough and crosses the mid-
atlantic tonight. The airmass should be too dry for any shower
development. However, the low 80s surface water temps of the
chesapeake will continue to be a notable moisture source. A shower
cannot be ruled out near the bay this afternoon.

Short term tonight through Wednesday night
The upper trough axis crosses the area Tuesday night. This should
provide enough forcing for widely scattered showers with isolated
afternoon thunderstorms. Otherwise, expect the coolest day in three
weeks with MAX temps in the upper 70s.

Return southerly flow that begins late Wednesday behind the surface
high.

Long term Thursday through Sunday
After a cool (for late june) period high pressure moves offshore
Thursday and the heat and humidity return through the weekend.

Still, not extreme heat: upper 80s around 90.

It is hard to pin down the exact timing chance of precipitation
several days in advance, but for now it looks like Saturday
night Sunday would have the best chances as a shortwave tracks
north of the forecast area.

4th of july is still beyond the scope of this forecast, but for
now neither the GFS or euro shows anything too dangerous -
euro's upper pattern is high zonal while GFS has a weak upper
trough running down the eastern seaboard.

Aviation 07z Monday through Friday
Vfr prevails through the week as high pressure slowly builds from
the west. Passing shower isolated thunderstorm Tuesday ahead of a
cold front.

Vfr conditions expected Thursday and Friday.

Marine
Nwly flow may gust to around 20 knots this morning, but confidence
is low, so winds were capped at 15 knots. High pressure slowly
builds through Wednesday. Return southerly flow begins Wednesday
night as the high shifts to bermuda.

Winds expected to remain below SCA values Thursday Friday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Products... Baj woody!


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 92 mi49 min NW 2.9 G 5.1 71°F 82°F1017 hPa (+0.0)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charlottesville-Albemarle Airport, VA4 mi56 minN 010.00 miFair59°F50°F72%1018 hPa
Orange, Orange County Airport, VA23 mi54 minSW 410.00 miFair59°F48°F68%1018.3 hPa
Louisa, Louisa County Airport/Freeman Field, VA24 mi54 minN 010.00 miFair55°F53°F94%1017.9 hPa

Wind History from CHO (wind in knots)
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Last 24hrW3W5W4W3W3W3CalmNW9W5N4NW53SW83NW6NW4CalmCalmW3CalmSW4SW4SW3Calm
1 day agoW3Calm36SW4W3554N6CalmCalm33CalmCalm33CalmCalmCalmCalmCalmW3
2 days agoS10S8S7S9S12S13S11S10SW6SW4SW5S11S13SW10
G17
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S11S11S8SW6

Tide / Current Tables for Fredericksburg, Rappahannock River, Virginia
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Fredericksburg
Click for Map
Mon -- 04:14 AM EDT     0.07 feet Low Tide
Mon -- 05:48 AM EDT     Sunrise
Mon -- 08:40 AM EDT     Moonrise
Mon -- 09:33 AM EDT     3.70 feet High Tide
Mon -- 05:01 PM EDT     -0.13 feet Low Tide
Mon -- 08:37 PM EDT     Sunset
Mon -- 10:13 PM EDT     3.27 feet High Tide
Mon -- 10:54 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
21.30.80.40.10.212.23.13.63.63.22.61.91.20.70.1-0.10.21.12.22.93.33.1

Tide / Current Tables for Massaponax, Rappahannock River, Virginia
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Massaponax
Click for Map
Mon -- 04:30 AM EDT     0.04 feet Low Tide
Mon -- 05:48 AM EDT     Sunrise
Mon -- 08:40 AM EDT     Moonrise
Mon -- 09:24 AM EDT     3.28 feet High Tide
Mon -- 05:17 PM EDT     -0.14 feet Low Tide
Mon -- 08:37 PM EDT     Sunset
Mon -- 10:05 PM EDT     2.90 feet High Tide
Mon -- 10:54 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.20.70.40.10.10.81.82.83.23.22.82.31.71.10.60.2-0.100.91.92.62.92.7

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

Wind Forecast for Baltimore, MD/Washington (4,6,7,8)
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Ground Weather Radar Station Sterling, VA
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weather_mapweather_map weather_map

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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 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.