Friday, January19, 2018 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 7:25AMSunset 5:24PM Friday January 19, 2018 6:27 PM EST (23:27 UTC) Moonrise 9:00AMMoonset 7:56PM Illumination 10% Phase: Waxing Crescent; Moon at 3 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- 331 Pm Est Fri Jan 19 2018
Rest of this afternoon..S winds 5 kt. Waves less than 1 ft.
Tonight..SW winds 5 kt. Waves less than 1 ft.
Sat..SW winds 5 kt. Waves less than 1 ft.
Sat night..NW winds around 5 kt. Waves 1 ft.
Sun..S winds around 5 kt. Waves 1 ft.
Sun night..S winds 5 kt. Waves less than 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft. Showers likely through the night.
Tue..W winds 5 to 10 kt. Waves 1 ft. A chance of showers through the day.
ANZ500 331 Pm Est Fri Jan 19 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build from the gulf coast to the eastern seaboard through this weekend. The next cold front will approach the area Monday and cross the area early Tuesday. Small craft advisories may be necessary Tuesday.

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 191923
afdlwx
area forecast discussion
national weather service baltimore md washington dc
223 pm est Fri jan 19 2018

Synopsis
High pressure to the south will dominate the weather through
the weekend. A cold front will approach the region Monday before
passing through Monday night into Tuesday. High pressure will return
for Wednesday through Thursday of next week before moving offshore
Friday.

Near term through tonight
High pressure extends from the southeastern CONUS to the mid
atlantic. Wave clouds still reside across southern pennsylvania
into western maryland; otherwise the forecast area is mostly
sunny aside from a few cirrus.

Winds never fully decoupled last night. Tonight's setup will be
quite similar aside from a lack of an offshore coastal cyclone.

Nonetheless, in light of good model agreement, am hesitant to
undercut low temperatures. Will therefore leave lows in the
upper 20s to near 30.

Short term Saturday through Sunday night
While the high pressure ridge remains in place through the
weekend, there will be a couple of transitory features in the
mean westerly flow: southern stream 500 mb shortwave cyclone
along the gulf coast, and northern stream low pressure across
southern canada with weak attendant boundary emanating
west southwest from it.

While neither will have a direct impact locally, warm advection
in the wake of the former disturbance will spread moisture
north Saturday-Saturday night. Saturday will still be sunny. At
this time, it appears as though any precip will be confined to
mountains Saturday night. Further, it is looking more likely
that temperatures will remain above freezing through this time,
so have removed mention of freezing rain.

Sunday will be cloudier, in part due to the pressure weakness.

But forcing will be too meager for anything but clouds.

Thermally, the cloud cover likely will lead to slightly cooler
temperatures, but highs will still be at-or-above 50 degrees.

Long term Monday through Friday
A cold front will approach from the west Monday before passing
through Monday night into Tuesday. Showers are expected ahead of the
boundary... Especially Monday night into Tuesday. A southerly flow
ahead of the boundary will allow for mild conditions Monday... But
low clouds and fog are possible and if this develops it would cause
temps to be a bit cooler than currently forecasted.

The cold front will move off to the east later Tuesday and high
pressure will return for Wednesday and Thursday. Dry and seasonably
chilly conditions are expected during this time.

The high will move offshore late in the week and milder conditions
will return due to a southerly flow.

Aviation 19z Friday through Wednesday
Vfr conditions will prevail through the weekend with high
pressure positioned just southwest of the terminals.

A cold front will approach from the west Monday. Low clouds and fog
are possible ahead of the cold front due to warm and moist air
overrunning cooler air near the surface... But confidence is low at
this time.

The cold front will pass through Monday night into Tuesday...

bringing showers and subvfr conditions. High pressure will return
for later Tuesday and Wednesday withVFR conditions likely.

Marine
Winds will be 10 kt or less through the weekend with high
pressure positioned southwest of the waters. Flow will have a
primary southwest component, but will veer west northwest by
Sunday as a front approaches.

A cold front will approach the waters Monday before passing through
Monday night or Tuesday. High pressure will return for the middle
portion of next week. A small craft advisory may be needed for
portions of the waters Monday night through Wednesday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Bjl
near term... Hts
short term... Hts
long term... Bjl
aviation... Hts bjl
marine... Hts bjl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 92 mi39 min 34°F1017.3 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Charlottesville-Albemarle Airport, VA4 mi34 minVar 310.00 miFair50°F3°F14%1016.9 hPa
Orange, Orange County Airport, VA23 mi32 minN 010.00 miFair46°F6°F20%1017.3 hPa
Louisa, Louisa County Airport/Freeman Field, VA24 mi32 minS 310.00 miFair44°F5°F20%1019 hPa

Wind History from CHO (wind in knots)
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Last 24hrS7S4S7S4SE3S7S6S6SW7SW6SW5SW43SW3S5SW6S9SW7
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1 day agoN5N5W54NW5NW64NW5NW8
G16
54W3W33SW345SW8SW76SW6SW5
G14
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2 days agoCalmCalmCalmCalmN3CalmN4NE6NE7CalmCalmNE5NE5NE5N5NW44CalmN74N8N4N5N6

Tide / Current Tables for Fredericksburg, Rappahannock River, Virginia
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Fredericksburg
Click for Map
Fri -- 03:26 AM EST     -0.15 feet Low Tide
Fri -- 07:23 AM EST     Sunrise
Fri -- 08:42 AM EST     2.48 feet High Tide
Fri -- 08:55 AM EST     Moonrise
Fri -- 03:23 PM EST     -0.13 feet Low Tide
Fri -- 05:17 PM EST     Sunset
Fri -- 07:51 PM EST     Moonset
Fri -- 08:49 PM EST     2.73 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.50.1-0.1-0.10.41.322.42.52.21.71.10.50.1-0.1-0.10.41.22.12.62.72.52

Tide / Current Tables for Massaponax, Rappahannock River, Virginia
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Massaponax
Click for Map
Fri -- 03:41 AM EST     -0.08 feet Low Tide
Fri -- 07:23 AM EST     Sunrise
Fri -- 08:30 AM EST     2.15 feet High Tide
Fri -- 08:55 AM EST     Moonrise
Fri -- 03:38 PM EST     -0.07 feet Low Tide
Fri -- 05:17 PM EST     Sunset
Fri -- 07:51 PM EST     Moonset
Fri -- 08:38 PM EST     2.36 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
10.50.2-0-0.10.31.11.82.12.11.91.410.50.2-0-0.10.31.11.92.32.32.11.7

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 (18,4,5,8)
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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.