Sunday, March26, 2017 L-36.com


Marine Weather and Tides
Mount Vernon, 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 6:59AMSunset 7:28PM Sunday March 26, 2017 1:28 AM EDT (05:28 UTC) Moonrise 5:18AMMoonset 5:00PM Illumination 2% Phase: Waning Crescent; Moon at 28 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 Sat Mar 25 2017
.small craft advisory in effect through Sunday evening...
Rest of tonight..E winds 5 to 10 kt. Gusts up to 20 kt. Waves 1 ft.
Sun..E winds 10 kt with gusts to 20 kt. Waves 1 ft. A chance of rain with patchy drizzle.
Sun night..S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft. A chance of rain with patchy drizzle.
Mon..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Mon night..SW winds around 5 kt. Waves 1 ft.
Tue..S winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Tue night..W winds 5 kt. Waves less than 1 ft. A chance of showers.
Wed..N winds 5 kt. Waves less than 1 ft. A chance of showers in the morning.
Thu..SE winds around 5 kt. Waves 1 ft. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1031 Pm Edt Sat Mar 25 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain over bermuda through today. A backdoor cold front will pass through the area tonight before returning north as a warm front Monday. A cold front is expected to cross the chesapeake bay region Tuesday night. Small craft advisories are likely Sunday night through Monday. Another small craft advisory is possible Wednesday behind the cold front.

7 Day Forecast for Marine Location Near Mount Vernon, VA
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location: 38.68, -77.1     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 260106
afdlwx
area forecast discussion
national weather service baltimore md/washington dc
906 pm edt Sat mar 25 2017

Synopsis
A backdoor cold front will move into the outlook area this
evening and stall just south of the area overnight and Sunday
before returning north as a warm front on Monday. Another cold
front will cross the area late Tuesday.

Near term /through Sunday night/
A backdoor cold front is located across central pa this evening.

High pressure south of hudson bay will move to the southeast and
into northern new england tonight. This will help push the cold
front southward into the mid-atlantic resulting in an airmass
change Sunday morning. E-ne winds will usher in cool and damp
conditions from north to south Sunday morning resulting in a
much different day from today.

Iso-sct showers are possible overnight as a moist airmass stays
in place and backdoor cold front moves southward. Clouds will
increase and lower this evening mainly from north to south.

Light rain and patchy drizzle are possible Sunday as the
boundary layer moistens. Much cooler conditions expected across
much of the outlook area Sunday. Temps will range from the 40s
across northeast md to the low-mid 60s across the central
va. There is uncertainty in the temperature forecast for Sunday
as the backdoor cold front will dictate the high temperatures.

Prev discussion...

much better chance for showers Sun night in area of strong
surface and moisture convergence and warm air overrunning cool
surface air.

Short term /Monday through Monday night/
Front lifts north as a warm front Mon afternoon with
temperatures rising back into the 70s. Area will be in a light
westerly downslope flow leading to some clearing. Risk of
showers increases again late Mon night and Tue as low pressure
and associated cdfnt crosses the area. Enough instability is
also present on Tue for a risk of t-storms. Drying expected late
tue night behind fropa.

Long term /Tuesday through Saturday/
Front approaches from the west on Tuesday with showers and
thunderstorms possible. Conditions should start drying out early
on Wednesday as high pressure builds over our region. Dry
conditions continue into Thursday before a wave of low pressure
moves through the mid- atlantic increasing pops Thursday night
and into Friday. Another low pressure moves east towards the
mid- atlantic Friday night into Saturday keeping rainy
conditions over our region.

Aviation /01z Sunday through Thursday/
Cigs will drop this evening and become ifr across the terminals
except kcho by Sunday morning. CIGS will remain low Sunday. Cigs
may lift to MVFR Sunday afternoon but confidence is low and cigs
may stay ifr through the day. CIGS will drop to ifr/lifr Sunday
night. Winds become e-ne tonight and Sunday. Showers expected
sun night everywhere.

Cold front approaches on Tuesday, then dry conditions return
Wednesday into Thursday. Sub-vfr periods possible Tuesday into
Tuesday night, thenVFR Wednesday into Thursday.

Marine
Winds will strengthen across the upper chesapeake bay
late this evening behind backdoor front. Winds remain gusty
across the NRN waters and upper potomac river through sun. Winds
then increase again Sun night across the southern waters with
sca Mon and Mon night.

Cold front approaches on Tuesday, then dry conditions return
Wednesday into Thursday. Winds are expected to remain below the
small craft advisory threshold.

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

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 9 pm edt Sunday for anz530>532-535-
538>540.

Small craft advisory from 3 am to 9 pm edt Sunday for anz533-
536-541-542.

Synopsis... Lfr
near term... Hsk/lfr
short term... Lfr
long term... Imr
aviation... Hsk/imr/lfr
marine... Hsk/imr/lfr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 14 mi40 min E 5.1 G 11 58°F 48°F1023.2 hPa
BSLM2 - Chesapeake Bay, MD 22 mi118 min NE 5.1 60°F 1023 hPa48°F
NCDV2 25 mi40 min ESE 2.9 G 2.9 57°F 53°F1021.7 hPa
44062 - Gooses Reef, MD 37 mi28 min ENE 5.8 G 7.8 49°F 46°F1 ft1024.7 hPa (+1.8)
TPLM2 - Thomas Point, MD 38 mi28 min ENE 15 G 16 50°F 45°F42°F
APAM2 - 8575512 - Annapolis, MD 39 mi40 min 52°F 1024.6 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 42 mi40 min ENE 1.9 G 6 50°F 1024.2 hPa
SLIM2 - 8577330 - Solomons Island, MD 42 mi46 min ENE 8 G 11 56°F 46°F
CPVM2 44 mi40 min 51°F 44°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 48 mi40 min ENE 14 G 16 50°F 1025.2 hPa
PPTM2 - 8578240 - Piney Point, MD 48 mi40 min ENE 8 G 8.9
FSNM2 48 mi40 min ENE 17 G 20 49°F 1024.7 hPa
BLTM2 - 8574680 - Baltimore, MD 49 mi40 min ESE 13 G 17 51°F 47°F1025 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA5 mi91 minN 010.00 miOvercast61°F51°F71%1022.3 hPa
Washington/Reagan National Airport, DC, VA13 mi37 minENE 910.00 miOvercast58°F46°F67%1023.5 hPa
Quantico Marine Corps Airfield - Turner Field, VA16 mi33 minSW 710.00 miOvercast63°F52°F68%1022.4 hPa
Camp Springs / Andrews Air Force Base, MD16 mi31 minE 11 G 1710.00 miOvercast53°F44°F72%1023.9 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA22 mi33 minE 610.00 mi66°F52°F61%1022.9 hPa
College Park Airport, MD23 mi48 minE 9 G 1710.00 miMostly Cloudy55°F44°F67%1024.4 hPa

Wind History from DAA (wind in knots)
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Last 24hrS4S3CalmCalmCalmCalmCalm3S5S5S5CalmSW34SE8SE3CalmCalmCalm3CalmSE3Calm3
1 day agoSE6SE5S6SE6S6S6S8S8S7S7S5S8S12
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53S4S3S34SW5S3
2 days agoN4CalmCalmCalmCalmCalmCalm44CalmW43NW336Calm4SE4SE4S4SE6SE5SE6SE5

Tide / Current Tables for Marshall Hall, Potomac River, Maryland
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Marshall Hall
Click for Map
Sun -- 01:19 AM EDT     0.19 feet Low Tide
Sun -- 06:17 AM EDT     Moonrise
Sun -- 07:02 AM EDT     Sunrise
Sun -- 07:26 AM EDT     2.49 feet High Tide
Sun -- 01:42 PM EDT     0.13 feet Low Tide
Sun -- 06:00 PM EDT     Moonset
Sun -- 07:26 PM EDT     Sunset
Sun -- 07:48 PM EDT     2.51 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.20.30.61.21.82.32.52.42.11.510.50.20.10.40.91.62.12.42.52.21.71.2

Tide / Current Tables for High Point, Occoquan Bay, Virginia
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High Point
Click for Map
Sun -- 12:39 AM EDT     0.12 feet Low Tide
Sun -- 06:18 AM EDT     Moonrise
Sun -- 06:25 AM EDT     1.74 feet High Tide
Sun -- 07:02 AM EDT     Sunrise
Sun -- 01:02 PM EDT     0.08 feet Low Tide
Sun -- 06:00 PM EDT     Moonset
Sun -- 06:46 PM EDT     1.76 feet High Tide
Sun -- 07:26 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.10.30.81.21.61.71.71.51.10.70.40.20.10.20.51.11.51.71.71.61.20.90.5

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 (1,6,7,8)
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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.