Wednesday, September20, 2017 L-36.com


Marine Weather and Tides
Ravensworth, 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 6:54AMSunset 7:09PM Wednesday September 20, 2017 3:36 AM EDT (07:36 UTC) Moonrise 6:10AMMoonset 6:42PM Illumination 0% Phase: New Moon; Moon at 29 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- 131 Am Edt Wed Sep 20 2017
Overnight..NW winds 5 kt. Waves less than 1 ft.
Wed..NW winds 5 to 10 kt. Waves 1 ft.
Wed night..N winds around 5 kt. Waves 1 ft.
Thu..N winds 5 kt. Waves less than 1 ft.
Thu night..N winds around 5 kt. Waves 1 ft or less.
Fri..N winds around 5 kt. Waves 1 ft.
Fri night..N winds around 5 kt. Waves 1 ft or less.
Sat..NW winds around 5 kt. Waves 1 ft or less.
Sun..N winds around 5 kt. Waves 1 ft or less.
ANZ500 131 Am Edt Wed Sep 20 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Hurricane jose is forecast to track north offshore through tonight. Consult products from the national hurricane center for the latest information on jose. High pressure will build overhead today through the weekend.

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 200054 aaa
afdlwx
area forecast discussion... Updated
national weather service baltimore md washington dc
854 pm edt Tue sep 19 2017

Synopsis
A ridge of high pressure will remain over the eastern united
states through early next week. Meanwhile, hurricane jose is
expected to track north off the mid atlantic coast through
Wednesday. Refer to the national hurricane center's website
hurricanes.Gov for the latest on jose.

Near term until 7 am Wednesday morning
A ridge of high pressure remains overhead this evening as
hurricane jose gradually moves northeastward offshore of the
mid-atlantic coastline. Western extent of the cloud shield from
jose reaches to about the i-95 corridor this evening, and that
should progress eastward during the overnight hours. A few rain
showers in the far outer band also remain near the chesapeake,
but those too should diminish.

With mostly clear skies and diminishing winds, patchy fog will
likely develop again tonight into early Wednesday morning,
mainly west of the metros. The pressure gradient from jose
should keep enough wind in the boundary layer to prevent fog
from developing in points east.

Lows overnight will range from the upper 50s to upper 60s,
locally 70f in the urban centers.

Short term 7 am Wednesday morning through Thursday night
An upper-level ridge will remain over the area... But a weak
disturbance will approach from the west. A northwest flow behind
jose will allow for sunshine and it will be unseasonably warm
for this time of year due to subsidence associated with the
upper-level ridge. MAX temps will be in the mid to upper 80s
across most locations. A few popup showers are possible later
Wednesday afternoon and evening across the potomac highlands
into central virginia where there will be a little instability
closer to the weak upper- level disturbance. However... Coverage
will be isolated to widely scattered due to the lack of a strong
lifting mechanism.

High pressure both at the surface and aloft will continue to
build overhead Wednesday night through Thursday night. Dry warm
conditions are expected during this time. Areas of fog are
likely during the overnight and morning hours.

Long term Friday through Tuesday
Mainly dry conditions expected in the long term period as upper
level ridge surface high pressure continues over our area Friday
into Tuesday. Some showers over the ridges cannot be ruled out,
but looking dry over most of our cwa. High temperatures will be
in the mid 80s, around 10 degrees higher than normal. Remnants
of jose might be lingering off of the mid- atlantic new england
coast, away from us, and maria could be somewhere in the west
atlantic, but it is too early to tell. Check out the national
hurricane center's website: hurricanes.Gov, for additional
information in both jose and maria.

Aviation 01z Wednesday through Sunday
Vfr conditions are expected through the remainder of the
evening. Patchy fog will then develop overnight into Wednesday
morning, with greatest risk for ifr at cho and mrb. Little
impact expected at other sites.

High pressure will remain over the terminals for later Wednesday
through Thursday night. Areas of fog are possible during the
overnight and morning hours.

Vfr conditions expected Friday into Sunday with high pressure
over our area.

Marine
Jose will continue to move north well offshore, moving away
from the area tonight through Wednesday. Breezy conditions with
gusts around 20 to 25 knots have occurred this evening... With
the strongest winds over the southern maryland chesapeake bay
and lower tidal potomac. Winds will remain near SCA criteria for
portions of the waters into Wednesday morning. Therefore the
small craft advisory remains in effect for tonight into
Wednesday across the middle portion of the bay and the lower
tidal potomac river as north to northwest winds channel.

Northwest winds will continue Wednesday afternoon. A few gusts
around 20 knots cannot be ruled out... But latest forecast has
gusts capped at 15 knots due to a weaker gradient as jose moves
away. High pressure will build overhead for Wednesday night
through Thursday night.

No small craft advisory expected between Friday and Sunday due
to low wind speeds over our area.

Tides coastal flooding
Anomalies have risen markedly over the past couple of hours as
northerly winds have gradually abated, so have extended coastal
flood advisory for st. Mary's county through Wednesday and have
added calvert and anne arundel for the high tide cycle late
tonight into early Wednesday morning. Additional
extensions expansions in area and time are possible through
Thursday. Moderate flooding is also a possibility at straits
point Wednesday into Thursday.

Lwx watches warnings advisories
Dc... None.

Md... Coastal flood advisory from 1 am to 6 am edt Wednesday for
mdz018.

Coastal flood advisory from 3 am to 10 am edt Wednesday for
mdz014.

Coastal flood advisory until 7 pm edt Wednesday for mdz017.

Va... None.

Wv... None.

Marine... Small craft advisory until 6 am edt Wednesday for anz532-533-
540-541.

Small craft advisory until 11 am edt Wednesday for anz534-537-
543.

Synopsis... Bjl
near term... Bjl mm
short term... Bjl
long term... Imr
aviation... Bjl mm imr
marine... Bjl mm imr
tides coastal flooding... Mm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi49 min NW 4.1 G 6 75°F
BSLM2 - Chesapeake Bay, MD 27 mi127 min Calm 67°F 1012 hPa64°F
NCDV2 36 mi49 min WNW 1.9 G 4.1 76°F1011.8 hPa
APAM2 - 8575512 - Annapolis, MD 41 mi49 min 1011.3 hPa
44063 - Annapolis 42 mi37 min N 7.8 G 9.7 74°F 75°F1011.7 hPa (+0.0)
TPLM2 - Thomas Point, MD 42 mi37 min NW 7 G 8 74°F 75°F
CPVM2 46 mi67 min 75°F 70°F
BLTM2 - 8574680 - Baltimore, MD 46 mi49 min N 7 G 9.9 78°F1011.6 hPa
44062 - Gooses Reef, MD 46 mi37 min N 14 G 16 75°F 74°F1011.9 hPa (-0.2)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 46 mi49 min NW 12 G 13 1011.8 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
Fort Belvoir, VA7 mi99 minWNW 39.00 miFair68°F63°F85%1013.5 hPa
Washington/Reagan National Airport, DC, VA10 mi45 minNNW 810.00 miMostly Cloudy73°F64°F76%1013.1 hPa
Washington/Dulles International Airport, DC, VA16 mi45 minN 010.00 miA Few Clouds64°F63°F96%1013.5 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi41 minSE 44.00 miFog/Mist61°F61°F100%1014.7 hPa
College Park Airport, MD19 mi52 minN 010.00 miOvercast70°F63°F80%1012.5 hPa
Camp Springs / Andrews Air Force Base, MD19 mi99 minNNW 710.00 miFair69°F63°F80%1013.3 hPa
Quantico Marine Corps Airfield - Turner Field, VA22 mi41 minNW 610.00 miFair69°F66°F90%1013.5 hPa
Gaithersburg - Montgomery County Airport, MD24 mi41 minN 010.00 miOvercast66°F63°F90%1016.1 hPa

Wind History from DAA (wind in knots)
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Last 24hrCalmNW4NW5NW5NW7N5N5N6NW7NW7NW11
G15
N6
G15
NW6N6N5NW4NW3NW3NW3NW6NW6NW3NW3NW3
1 day agoCalmCalmCalmCalmNW3NE3CalmE4CalmN3NE3--CalmNE3CalmCalmCalmCalmCalmCalmCalmCalmNW4Calm
2 days agoCalmCalmCalmSE3CalmCalmCalmCalmCalmSE4CalmCalmCalmE4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Wed -- 01:30 AM EDT     New Moon
Wed -- 03:35 AM EDT     0.02 feet Low Tide
Wed -- 06:54 AM EDT     Sunrise
Wed -- 07:09 AM EDT     Moonrise
Wed -- 09:12 AM EDT     3.55 feet High Tide
Wed -- 03:59 PM EDT     -0.01 feet Low Tide
Wed -- 07:08 PM EDT     Sunset
Wed -- 07:41 PM EDT     Moonset
Wed -- 09:36 PM EDT     3.55 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.81.10.60.10.10.61.62.53.23.53.42.82.11.40.80.3-00.31.22.233.53.53.1

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Wed -- 01:30 AM EDT     New Moon
Wed -- 03:09 AM EDT     0.03 feet Low Tide
Wed -- 06:54 AM EDT     Sunrise
Wed -- 07:09 AM EDT     Moonrise
Wed -- 08:53 AM EDT     3.43 feet High Tide
Wed -- 03:33 PM EDT     0.00 feet Low Tide
Wed -- 07:07 PM EDT     Sunset
Wed -- 07:41 PM EDT     Moonset
Wed -- 09:16 PM EDT     3.44 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.50.90.400.211.92.73.33.43.12.51.81.10.60.10.10.61.52.43.13.43.32.8

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 (3,6,7,8)
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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.