Thursday, March30, 2017 L-36.com


Marine Weather and Tides
Ravensworth, VA

Version 3.4
What's New / NOTES
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:53AMSunset 7:32PM Thursday March 30, 2017 4:19 PM EDT (20:19 UTC) Moonrise 7:49AMMoonset 9:39PM Illumination 12% 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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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 347 Pm Edt Thu Mar 30 2017
Rest of this afternoon..SE winds 10 kt. Waves 1 ft.
Tonight..SE winds 5 to 10 kt. Waves 1 ft. Rain likely.
Fri..SE winds 5 to 10 kt. Waves 1 ft. Rain. Vsby 1 to 3 nm.
Fri night..W winds 5 to 10 kt. Waves 1 ft. Showers likely. Patchy fog.
Sat..NW winds 5 to 10 kt. Waves 1 ft.
Sat night..NW winds 5 to 10 kt. Waves 1 ft.
Sun..S winds around 5 kt. Waves 1 ft.
Mon..SE winds 5 to 10 kt. Waves 1 ft. A chance of rain through the day...then rain likely through the night.
ANZ500 347 Pm Edt Thu Mar 30 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will move offshore through tonight. Low pressure will approach the waters Friday before passing through Friday evening. High pressure will build over the waters again by Sunday. Low pressure may impact the waters early next week. Small craft advisories are possible Saturday.

7 Day Forecast for Marine Location Near Ravensworth, VA
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location: 38.82, -77.22     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 301425
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
1025 am edt Thu mar 30 2017

Synopsis
High pressure will move offshore today through tonight. Low
pressure will pass through the area Friday. High pressure will
gradually return Saturday and Sunday before another low pressure
possibly impacts the area Monday and Tuesday next week.

Near term /until 6 pm this evening/
Ridge of surface high pressure has wedged itself down the
eastern us seaboard and will remain in place for much of today.

This has led to the development of low level easterly flow, and
this in turn has promoted the formation of stratus clouds across
central and western virginia. These will slowly grow in
coverage through the day and advect northeastward as
southwesterly flow develops a few thousand feet above the
surface. At the same time, a low pressure system centered over
missouri this morning will move northeastward and into illinois
by this evening. Warm and moist air advection will increase
aloft, leading to high clouds which will also stream aloft
overhead through the day. Most of the shower activity should
remain north/west of the region today towards the area of
greater forcing, however, some showers may make their way into
parts of eastern west virginia and western maryland during the
day. Highs today will be in the 50s.

Short term /6 pm this evening through Saturday night/
Warm and moist air advection continues tonight and with that
we'll see increasing chances for rain, especially towards
morning. Model guidance in good agreement that the low pressure
system will track east-northeastward from over illinois this
evening to ohio by Friday afternoon, before redeveloping near or
over the area late Friday and Friday night. Most widespread and
steady rain is expected Friday morning, and rain could be heavy
at times. Lows tonight mainly in the 40s. With the low expected
to track near the region, will continue to monitor trends as to
how far north the warm sector can make it Friday afternoon
following initial surge of rain. Best chances for thunder will
be south of dc, and the storm prediction center has placed
portions of the region in a marginal risk for severe
thunderstorms.

High temperatures will be very dependent on initial rain and
progress of warm sector, but will show low 50s north to mid 60s
south.

Showers will begin to taper off Friday night as low pulls away
and northwest flow develops. Lows in the 40s.

High pressure will begin to build in during the day Saturday. A
lingering shower or two will be possible in northwest flow, but
most places will likely remain dry. Highs should be near
normal for the first day of april, from the upper 50s to mid
60s. High pressure then moves overhead Saturday night, with
mostly clear skies and lows in the 40s.

Long term /Sunday through Wednesday/
High pressure will build overhead for Sunday... Bringing dry
conditions along with sunshine and a seasonably mild afternoon.

High pressure will move offshore Sunday night and low pressure
will track into the tennessee valley Monday before passing
through our area Tuesday. The exact track of the low is a bit
uncertain at this time... But a soaking rain is likely Monday
into Tuesday. Should the low track farther north... Then a few
thunderstorms would be possible. Confidence for thunderstorms is
low at this point.

High pressure will return during the middle portion of next
week.

Aviation /15z Thursday through Monday/
Vfr expected through today, although with multiple decks of
increasing clouds. Light northeast winds this morning will turn
southeast through today and increase up to about 10 knots.

Ceilings will lower and rain will overspread the region later
tonight and into Friday morning. Widespread ifr/sub-ifr
conditions likely, especially during the 06z-18z time period.

Some improvement possible after 18z Friday as steady rain ends,
especially cho. The northern TAF sites, mtn/bwi/mrb likely to
remain locked into ifr/sub-ifr. Iad/dca a bit more questionable.

A few thunderstorms are also possible Friday afternoon, with
highest chance at cho.

Improvement back toVFR will take place Friday night, withVFR
area-wide expected Saturday and Saturday night. Winds will turn
northwesterly Saturday as well.

High pressure will build over the terminals Sunday.VFR
conditions are expected. High pressure will move offshore Sunday
night and low pressure will approach from the west on Monday.

Clouds and chances for rain will increase during this time.

Subvfr conditions are possible.

Marine
Sub-sca northeasterly winds this morning will turn southeasterly
this afternoon and strengthen this evening. A sca GOES into
effect at 6 pm for portions of the central chesapeake and lower
tidal potomac and expands through Friday as the highest risk of
20 knot gusts lies expands with a northward moving warm front.

Sca tapers off during the evening Friday as cold front slides
east.

Winds will turn northwesterly behind the departing frontal system
Friday night. Winds will increase again on Saturday, and
additional SCA winds are possible. Winds will decrease Saturday
night as high pressure builds in.

High pressure will build over the waters Sunday before moving
offshore Sunday night through Monday. Low pressure may impact
the waters Monday night into Tuesday.

Tides/coastal flooding
An onshore flow will increase tonight into Friday as high
pressure continues to move offshore. Low pressure will pass
through the area Friday night. The onshore may increase ahead of
this system.

Elevated water levels are expected tonight through Friday night
and minor tidal flooding is possible near times of high tide.

Lwx watches/warnings/advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 6 pm this evening to midnight edt
Friday night for anz531>534-537-539>541-543.

Small craft advisory from noon to 6 pm edt Friday for anz536-
538.

Small craft advisory from 6 am Friday to midnight edt Friday
night for anz530-542.

Synopsis... Bjl
near term... Mm
short term... Mm
long term... Bjl
aviation... Bjl/mm
marine... Bjl/mm
tides/coastal flooding... Lwx


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi50 min SE 5.1 G 9.9 54°F 54°F1019.5 hPa
BSLM2 - Chesapeake Bay, MD 27 mi110 min SE 6 54°F 1022 hPa36°F
NCDV2 36 mi50 min SE 8.9 G 11 49°F 53°F1019.8 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi50 min 48°F 1020.9 hPa
TPLM2 - Thomas Point, MD 42 mi80 min ENE 1 G 1.9 47°F 47°F32°F
FSNM2 46 mi50 min ESE 8.9 G 11 46°F 1020.9 hPa
CPVM2 46 mi50 min 48°F 34°F
BLTM2 - 8574680 - Baltimore, MD 46 mi50 min SSE 7 G 8.9 47°F 47°F1021 hPa
44062 - Gooses Reef, MD 46 mi40 min S 12 G 14 48°F 1021.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 46 mi50 min E 8.9 G 9.9 46°F 1021.4 hPa

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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N3
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W2
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G9
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G15
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi22 minSE 710.00 miOvercast53°F33°F46%1020.3 hPa
Washington/Reagan National Airport, DC, VA10 mi28 minSSE 810.00 miOvercast54°F35°F49%1020.2 hPa
Washington/Dulles International Airport, DC, VA16 mi28 minSSE 1110.00 miOvercast52°F30°F43%1019.5 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi24 minSE 810.00 miOvercast54°F35°F49%1020.8 hPa
College Park Airport, MD19 mi39 minE 810.00 miOvercast52°F32°F48%1020 hPa
Camp Springs / Andrews Air Force Base, MD19 mi82 minSSE 710.00 miOvercast52°F30°F44%1021.1 hPa
Quantico Marine Corps Airfield - Turner Field, VA22 mi24 minSE 710.00 miOvercast54°F42°F64%1020.2 hPa

Wind History from DAA (wind in knots)
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Last 24hrNW11NW11
G17
NW9CalmNE3NE4CalmCalmCalmCalmCalmCalmCalmCalm3Calm--SE9E53SE8S6SE9SE7
1 day agoN6NW5W3NW7NW3N4NW3NW3N5CalmNW4NW4NW4N4N434N8NW10N5
G15
NW12
G15
4NW74
2 days ago3SE4Calm3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm36CalmS3NW12NW12
G19
5NW96

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Thu -- 05:21 AM EDT     0.01 feet Low Tide
Thu -- 06:55 AM EDT     Sunrise
Thu -- 08:48 AM EDT     Moonrise
Thu -- 10:53 AM EDT     3.61 feet High Tide
Thu -- 06:06 PM EDT     -0.08 feet Low Tide
Thu -- 07:30 PM EDT     Sunset
Thu -- 10:37 PM EDT     Moonset
Thu -- 11:29 PM EDT     3.22 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.82.21.50.80.300.10.71.72.83.43.63.32.71.91.20.60.2-0.10.10.91.92.83.2

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Thu -- 04:50 AM EDT     0.01 feet Low Tide
Thu -- 06:55 AM EDT     Sunrise
Thu -- 08:48 AM EDT     Moonrise
Thu -- 10:29 AM EDT     3.54 feet High Tide
Thu -- 05:36 PM EDT     -0.07 feet Low Tide
Thu -- 07:30 PM EDT     Sunset
Thu -- 10:37 PM EDT     Moonset
Thu -- 11:05 PM EDT     3.16 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.51.81.10.50.100.31.12.23.13.53.532.31.50.90.40-00.41.32.32.93.2

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 (16,3,4,5)
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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.