Sunday, May20, 2018 L-36.com


Marine Weather and Tides
Mount Vernon, VA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.

Sunrise 5:50AMSunset 8:20PM Sunday May 20, 2018 5:50 PM EDT (21:50 UTC) Moonrise 10:04AMMoonset 12:00AM Illumination 35% Phase: Waxing Crescent; Moon at 6 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- 432 Pm Edt Sun May 20 2018
Rest of this afternoon..SW winds 5 kt. Waves less than 1 ft. Isolated showers and tstms.
Tonight..NE winds around 5 kt. Waves 1 ft.
Mon..E winds 5 to 10 kt. Waves 1 ft.
Mon night..SE winds 5 to 10 kt. Waves 1 ft. Showers likely.
Tue..S winds 5 to 10 kt. Waves 1 ft. Showers likely.
Tue night..SW winds 5 kt. Waves less than 1 ft. A chance of showers.
Wed..NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Thu..SW winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 432 Pm Edt Sun May 20 2018
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will cross the waters tonight. The boundary will stall to the south Monday before returning north as a warm front Monday night and Tuesday. Another cold front will pass through the waters later Wednesday and Wednesday night before high pressure possibly returns late in the week. Small craft advisory conditions are possible Tuesday afternoon into Wednesday.

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 201852
afdlwx
area forecast discussion
national weather service baltimore md washington dc
252 pm edt Sun may 20 2018

Synopsis A weak cold front will cross the area tonight and
settle over the carolinas on Monday. High pressure will build
over the area on Monday. The front will return north as a warm
front on Tuesday with a cold front expected to pass through the
area on Wednesday. Weak high pressure will build over the area
for the second half of the week.

Near term through tonight
An isolated shower or t-storm will remain possible into early
this evening as a weak cold front crosses the area. Otherwise,
just sct-bkn cumulus clouds. Models now indicate the front will
make it much farther south into southern va and north carolina
on Monday leading to a dry day on Monday. Areas of fog are
possible late tonight given strengthening mid-level subsidence
and very wet moist ground despite lowering sfc dewpoints dry air
advection.

Short term Monday through Tuesday night
Sct-bkn mid-high level clouds Mon under sfc high pressure.

Strengthening warm air advection pattern Mon night and tue
associated with front lifting north will bring another round of
showers late Mon night into Tue evening with between a quarter
to half inch of rain expected. Chance of elevated t-storms mon
night mainly west of the blue ridge. Things begin to dry out
late Tue night as main shield of rain lifts to the east and cold
front begins to push south.

Long term Wednesday through Sunday
A upper level trough over eastern canada will slowly shift southward
into maine and new england on Wednesday. A surface low associated
with the trough will settle over new england. A frontal boundary
associated with the low will become stalled to the southeast of our
county warning area. Both GFS 12z and the 00z euro show a chance for
showers moving through our region on Wednesday. Precipitation will
be most likely on the western side of the shenandoah mountains and
our western parts of our CWA due to upsloping flow out of the west.

The area should remain on the cold side but the front doesn't look
to shift out of the region until early Thursday as a upper level
ridge shifts into the region from the west. Temperatures will hover
in the upper 70s to mid 80s throughout the region.

Thursday into Saturday, a upper level ridge shifts eastward over
our region. A high pressure system will slowly shift eastward into
our area from the great lakes. Skies will slowly clear and a
southerly flow forms as the high pressure shifts eastward off the
atlantic coast on Friday. Temperatures will slowly build into the
low 80s Thursday and then rise up into the mid to upper 80s toward
the end of next week. On Saturday, a cold front will approach from
the west leading to stronger warm air advection into the region.

Aviation 19z Sunday through Friday
Patchy dense fog possible at kmrb late tonight, otherwise 3-5sm
br at kcho and kiad. Showers return to the area late Mon night
and Tue with possible flight restrictions.

On Wednesday, a frontal boundary will be stalled to the southeast of
the county warning area. A westerly to northerly flow is expected
to the north of the boundary. Precipitation is possible which could
lead to the dropping of both visibilities and ceilings on
Wednesday. Thursday, skies begin to clear and winds look to remain
mostly light.

Marine
Winds should diminish below SCA by 22z today then remain below
sca through Tue morning. Possible SCA Tue afternoon into Wed as
winds turn southerly as warm front lifts through.

A frontal boundary to the southeast of the CWA will lead to winds
out of the west and the north. A northerly flow could lead to longer
fetches and the need for small craft advisories. Thursday, skies
are expected to clear as high pressure settles over the region.

Winds should remain below small craft advisor thresholds.

Tides coastal flooding
Moderate coastal flooding at georgetown through 6pm this
evening. Otherwise, minor coastal flooding expected at dc
waterfront and georgetown into Monday afternoon.

Climate
It has been an unusually wet pattern over the last week. For dca
(reagan national), there has been at least 1 4" of rain each of
the last 7 days. This is the longest streak on record. The previous
longest was 5 days in 2011, 2009, 1975, 1950, 1942, and 1937.

Precipitation records date back to 1871.

Lwx watches warnings advisories
Dc... Coastal flood warning until 6 pm edt this evening for dcz001.

Coastal flood advisory from 6 pm this evening to 6 pm edt
Monday for dcz001.

Md... None.

Va... Coastal flood advisory until 6 pm edt this evening for vaz054.

Wv... None.

Marine... Small craft advisory until 6 pm edt this evening for
anz530>543.

Synopsis... Lfr
near term... Lfr
short term... Lfr
long term... Jmg
aviation... Lfr jmg
marine... Lfr jmg
tides coastal flooding...

climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 14 mi51 min WNW 5.1 G 11 89°F 66°F1015.4 hPa (-0.9)
BSLM2 - Chesapeake Bay, MD 22 mi141 min WSW 5.1 81°F 1016 hPa64°F
NCDV2 25 mi51 min WSW 6 G 8 86°F 72°F1014.9 hPa (-1.1)
44062 - Gooses Reef, MD 37 mi41 min SSW 5.8 G 5.8 78°F 1016.4 hPa
TPLM2 - Thomas Point, MD 38 mi51 min SE 6 G 7 74°F 66°F1016.1 hPa (-0.8)68°F
APAM2 - 8575512 - Annapolis, MD 39 mi51 min 74°F 1014.7 hPa (-0.7)
44063 - Annapolis 40 mi41 min S 3.9 G 5.8 74°F 1015.7 hPa
SLIM2 - 8577330 - Solomons Island, MD 42 mi51 min SW 9.9 G 13 81°F 68°F1015.5 hPa (-1.1)
COVM2 - 8577018 - Cove Point LNG Pier, MD 42 mi51 min W 7 G 11 84°F 1016.4 hPa (-0.9)
CPVM2 44 mi51 min 77°F 68°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 48 mi51 min W 14 G 16 85°F 1014.8 hPa (-0.8)
FSNM2 48 mi51 min W 15 G 18 85°F 1015 hPa (-0.7)
PPTM2 - 8578240 - Piney Point, MD 48 mi51 min W 4.1 G 5.1
BLTM2 - 8574680 - Baltimore, MD 49 mi51 min WNW 4.1 G 11 87°F 69°F1014.6 hPa (-0.7)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA5 mi1.9 hrsW 610.00 miA Few Clouds89°F64°F44%1016.2 hPa
Washington/Reagan National Airport, DC, VA13 mi59 minVar 410.00 miPartly Cloudy89°F63°F42%1015.4 hPa
Quantico Marine Corps Airfield - Turner Field, VA16 mi55 minS 510.00 miMostly Cloudy79°F71°F77%1015.9 hPa
Camp Springs / Andrews Air Force Base, MD16 mi55 minN 010.00 miA Few Clouds85°F66°F54%1016 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA22 mi55 minSW 510.00 miA Few Clouds85°F66°F55%1016.6 hPa
College Park Airport, MD23 mi74 minWSW 710.00 miMostly Cloudy86°F62°F45%1015.2 hPa

Wind History from DAA (wind in knots)
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Last 24hrCalmS3CalmSE5SE5S3S4S4CalmS3SE5S4S4S3S5SW5S4S5S4S6SW4W5W6NW7
1 day agoNE4E4NE4E5CalmNE4SE4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN3CalmCalmSE3S3Calm
2 days agoCalmCalmNE4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4NE3E3E3CalmNE4E3E5E5NE5

Tide / Current Tables for Marshall Hall, Potomac River, Maryland
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Marshall Hall
Click for Map
Sun -- 12:28 AM EDT     2.54 feet High Tide
Sun -- 12:42 AM EDT     Moonset
Sun -- 05:52 AM EDT     Sunrise
Sun -- 06:38 AM EDT     0.28 feet Low Tide
Sun -- 11:03 AM EDT     Moonrise
Sun -- 12:37 PM EDT     2.82 feet High Tide
Sun -- 07:28 PM EDT     0.12 feet Low Tide
Sun -- 08:18 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.52.52.11.61.10.60.30.30.61.21.92.52.82.82.51.91.40.90.50.20.20.51.21.8

Tide / Current Tables for High Point, Occoquan Bay, Virginia
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High Point
Click for Map
Sun -- 12:42 AM EDT     Moonset
Sun -- 05:52 AM EDT     Sunrise
Sun -- 05:56 AM EDT     0.21 feet Low Tide
Sun -- 11:04 AM EDT     Moonrise
Sun -- 11:33 AM EDT     1.95 feet High Tide
Sun -- 06:48 PM EDT     0.10 feet Low Tide
Sun -- 08:18 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.71.51.10.80.50.30.20.30.71.31.71.91.91.71.410.70.40.20.10.30.71.21.6

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Mid-Atlantic    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
target = "new">Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (17,4,5,8)
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Ground Weather Radar Station Sterling, VA
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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.