Friday, August18, 2017 L-36.com


Marine Weather and Tides
Woodburn, 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 6:24AMSunset 7:59PM Friday August 18, 2017 11:46 PM EDT (03:46 UTC) Moonrise 1:54AMMoonset 4:38PM Illumination 10% Phase: Waning Crescent; Moon at 26 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- 1031 Pm Edt Fri Aug 18 2017
Rest of tonight..SW winds 5 kt. Waves less than 1 ft. A slight chance of showers.
Sat..W winds around 5 kt. Waves 1 ft.
Sat night..N winds around 5 kt. Waves 1 ft or less.
Sun..NW winds around 5 kt. Waves 1 ft.
Sun night..SE winds around 5 kt. Waves 1 ft or less.
Mon..S winds around 5 kt. Waves 1 ft.
Mon night..S winds 5 kt. Waves less than 1 ft.
Tue..SW winds 5 kt. Waves less than 1 ft.
Wed..NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1031 Pm Edt Fri Aug 18 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold will cross the waters tonight. A pressure trough will remain nearby for Saturday and Sunday while high pressure positions itself just to our north and west. The high will move offshore early next week. Small craft advisories may be needed Monday night and Tuesday.

7 Day Forecast for Marine Location Near Woodburn, VA
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location: 38.83, -77.23     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 190133
afdlwx
area forecast discussion
national weather service baltimore md washington dc
933 pm edt Fri aug 18 2017

Synopsis
A cold front will cross the region tonight. Surface high
pressure will build in Saturday, but an upper level disturbance
will cross the region Saturday night. A warm front will advance
back north across the region early next week, followed by a
strong cold front in the middle of the week.

Near term until 6 am Saturday morning
Heat advisory, severe thunderstorm watch, and flash flood watch
have all been cancelled. The line of thunderstorms that
developed along a prefrontal trough and ahead of a shortwave
trough aloft is now moving into southeast virginia and the
eastern shore.

The surface cold front is now moving into western maryland and
the eastern west virginia panhandle. Ahead of it, some elevated
instability remains, so have left a slight chance of showers in
the forecast for several more hours. A couple of showers
recently formed near hagerstown.

The front will slowly push through the area tonight, but
moisture will be slow to dwindle until it does. Have left
patchy fog in the forecast, though have low confidence in its
occurrence, particularly since mid level clouds seem to be
forming in the frontal zone. Lows will be a bit cooler than last
night, with 60s and low 70s expected.

Short term 6 am Saturday morning through Sunday night
Other than patchy fog, Saturday should start out tranquil with
some sun. Humidity will be lower, though temperatures will only
be a few degrees less than today. However, potent upper level
trough will move into the region late in the day and at night,
and it appears enough moisture will remain to result in isolated
showers and t-storms late in the day into the evening.

High pressure dominates Sunday for the most part, with
temperatures expected to drop a bit further once again - the
most comfortable day of the weekend. However, warm front will
start poking back north late in the day and at night, and that
may result in a return risk of showers in central va.

Long term Monday through Friday
High pressure will move offshore Monday and settle into
Tuesday, allowing for southerly flow to settle over our area.

Moisture advection could enhance diurnally driven showers and
thunderstorms Monday and Tuesday afternoon evening. An upper
trough and strong cold front will approach from the northwest on
Tuesday night into Wednesday, bringing additional chance of
showers and thunderstorms on Wednesday. The front should move
across on Wednesday night with a high pressure returning
Thursday into Friday.

High temperatures Monday through Wednesday will be in the mid
to upper 80s in northern maryland... To low 90s in central
virginia at times... And 70s at higher elevations... Highs in
the 70s and 80s Thursday and Friday.

Aviation 01z Saturday through Wednesday
The threat for thunderstorms has ended, though can't totally
rule out a rogue shower until frontal passage. The front is in
western maryland this evening and will progress east overnight.

Have limited br mention to cho, where front will take longest to
clear... Although overall confidence in any fog is low.

Otherwise, expectingVFR Saturday, though an isolated shower or
t-storm is possible late. MainlyVFR again Sunday with high
pressure dominant.

Vfr conditions expected Monday into Wednesday, with periods of
sub-vfr conditions mainly Monday and Tuesday afternoon evening
and Wednesday due to possible showers and thunderstorms.

Marine
Line of storms will continue to move east of the middle bay
through late evening, ending the threat for special marine
warnings. There is a lull in winds behind the storms, but
northerly channeling will be possible overnight as the actual
cold front passes, so SCA continues for main channel until early
morning. For balance of Saturday, should be sub sca, but an
isolated gusty t-storm is possible late in the day as an upper
trough moves on through. Returning to tranquil conditions
Sunday.

Mainly dry conditions expected Monday into Wednesday, with
periods of showers and thunderstorms possibly developing Monday
and Tuesday afternoon evening and Wednesday. Wind gusts are
expected to stay below the small craft advisory threshold.

Tides coastal flooding
Southerly flow will continue to cause elevated water levels
through tonight. Cfa for st. Mary's through tonight. Most
concern for an additional advisory is at annapolis, but want to
see how water recovers after sloshing from thunderstorms. Will
keep an eye on dc and baltimore as well. Cold front crossing
late tonight will bring NW N winds and decreasing water levels.

Lwx watches warnings advisories
Dc... None.

Md... Coastal flood advisory until 3 am edt Saturday for mdz017.

Va... None.

Wv... None.

Marine... Small craft advisory until 9 am edt Saturday for anz531>534-
537-539>541-543.

Small craft advisory until 1 am edt Saturday for anz530-535-
536-538-542.

Synopsis... Rcm
near term... Ads rcm
short term... Rcm
long term... Imr
aviation... Ads imr rcm
marine... Ads imr rcm
tides coastal flooding... Ads rcm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 11 mi47 min S 2.9 G 2.9 78°F 81°F1010.7 hPa (+1.8)
BSLM2 - Chesapeake Bay, MD 28 mi137 min SE 1.9 71°F 1011 hPa70°F
NCDV2 37 mi47 min SSE 2.9 G 5.1 75°F 83°F1010.4 hPa (+1.6)
APAM2 - 8575512 - Annapolis, MD 41 mi47 min 77°F 1010.6 hPa (+1.7)
44063 - Annapolis 42 mi37 min N 7.8 G 9.7 1 ft
TPLM2 - Thomas Point, MD 42 mi47 min SSW 14 G 15 77°F 80°F
CPVM2 46 mi47 min 78°F 78°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 46 mi47 min SW 5.1 G 6 76°F 1011 hPa (+2.0)
BLTM2 - 8574680 - Baltimore, MD 46 mi47 min Calm G 2.9 76°F 83°F1010.6 hPa (+1.9)
44062 - Gooses Reef, MD 47 mi37 min S 7.8 G 9.7 77°F 1 ft1012 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA7 mi49 minN 09.00 miFair76°F74°F96%1011.8 hPa
Washington/Reagan National Airport, DC, VA11 mi55 minS 410.00 miMostly Cloudy78°F75°F93%1011.4 hPa
Washington/Dulles International Airport, DC, VA15 mi55 minSSE 410.00 miOvercast76°F75°F100%1011.1 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA17 mi51 minN 010.00 miOvercast78°F75°F90%1012.1 hPa
College Park Airport, MD19 mi59 minN 010.00 miFair75°F74°F96%1011.2 hPa
Camp Springs / Andrews Air Force Base, MD19 mi1.8 hrsS 410.00 miA Few Clouds75°F73°F95%1011.6 hPa
Quantico Marine Corps Airfield - Turner Field, VA22 mi51 minS 910.00 miFair80°F78°F94%1011.6 hPa
Gaithersburg - Montgomery County Airport, MD24 mi51 minSSE 48.00 miMostly Cloudy75°F73°F96%1014 hPa

Wind History from DAA (wind in knots)
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Last 24hrSE4SE5CalmSE3SE4S5S3S3SW3S4S5S6S6SE9S7S9S7S5W5N3CalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSE5SE4S6S6SW5SE5SE11SE6SE6SE7SE6SE3SE3SE3
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmNW5NW3CalmNW7W4CalmCalmCalmCalmCalmNW3

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Fri -- 02:53 AM EDT     Moonrise
Fri -- 05:44 AM EDT     3.53 feet High Tide
Fri -- 06:24 AM EDT     Sunrise
Fri -- 12:59 PM EDT     0.24 feet Low Tide
Fri -- 05:38 PM EDT     Moonset
Fri -- 06:26 PM EDT     3.07 feet High Tide
Fri -- 07:58 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.51.32.233.43.53.22.621.40.90.50.20.51.22.12.7332.51.91.30.8

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Fri -- 12:01 AM EDT     0.35 feet Low Tide
Fri -- 02:53 AM EDT     Moonrise
Fri -- 05:51 AM EDT     3.50 feet High Tide
Fri -- 06:24 AM EDT     Sunrise
Fri -- 01:07 PM EDT     0.26 feet Low Tide
Fri -- 05:38 PM EDT     Moonset
Fri -- 06:33 PM EDT     3.05 feet High Tide
Fri -- 07:58 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.51.22.12.93.43.53.22.72.11.510.50.30.51.222.6332.621.40.8

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 (23,6,7,8)
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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.