Page Links Change Location One Page Printer Page HELP AIS Default setup SAVE setting RECALL saved setting

Marine Weather and Tides Mount Vernon, VA Version 3.4

What's New / NOTES 10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome. 10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

---

Sunrise 5:50AM

Sunset 8:20PM

Tuesday May 21, 2019 10:33 PM EDT (02:33 UTC)

Moonrise 10:12PM

Moonset 7:06AM

Illumination 90%

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.

---

---

7 Day Forecast for Marine Location Near Mount Vernon, VA

   Hourly   EDIT   Help

---

Area Discussion for - Baltimore, MD/Washington

      (on/off)   Help   NOTE: mouseover dotted underlined text for definition

Fxus61 klwx 220119 afdlwx area forecast discussion national weather service baltimore md washington dc 919 pm edt Tue may 21 2019 Synopsis Canadian high pressure will build overhead through tonight before moving offshore Wednesday. A warm front will pass through the area Wednesday night into Thursday. A cold front will approach Thursday night before stalling out nearby for Friday and Saturday. The boundary may hang around nearby for the rest of the weekend into early next week, causing the possibility of unsettled conditions. Near term through Wednesday Canadian high pressure will continue to build overhead through tonight bringing cool conditions for this time of year along with low humidity. There will be some high clouds moving through in the westerly flow aloft, but with the upper-level ridge axis to our west... The cloud deck should be thin due to subsidence. Min temps tonight range from the 40s in the colder valleys and rural areas to the mid upper 50s in downtown washington and baltimore. Short term Wednesday night through Thursday night The high will slowly move offshore Wednesday and a southerly flow will develop during the afternoon. There will be a slight increase in atmospheric moisture due to the southerly flow and warm advection. This may result in a thin stratocu deck underneath the subsidence inversion, but there should still be plenty of sunshine as well since the thin layer should mix out from daytime heating. MAX temps will be in the lower to middle 70s for most locations. The high will continue to move offshore Wednesday night and a warm front is expected to approach the area from the west overnight. The warm front will pass through the region Thursday morning. Weak isentropic lift and limited elevated instability ahead of the warm front may be enough to trigger a few showers, especially overnight Wednesday into Thursday morning. A rumble of thunder cannot be ruled out as well, but confidence is low at this point since the lifting mechanism will be weak. For Thursday afternoon, a southwest flow behind the warm front will bring a return to hotter and more humid conditions. Max temps will top off well into the 80s for most areas, and some areas may even approach 90 degrees. The increased heat and humidity will lead to an unstable atmosphere, and with our area between an upper-level high to the south and upper-level low to the north, there should be moderate amounts of deep layer shear. At the same time, a cold front will be approaching from the north but latest guidance keeps this boundary well to our north during peak heating before it drops down later Thursday night. Therefore, the timing of the boundary and peak heating are offset a bit. Having that been said, it will be a differential advection pattern (northwest flow aloft and southwest flow at the low-levels), which supports the development of convective systems (mcs). Will carry the chance for showers and thunderstorms Thursday afternoon and evening, and with the instability and shear in place, some of those storms could be severe. However, confidence still remains low due to uncertainty in timing of a convective system and also with the cold front arrival being after peak heating. The boundary will settle overhead late Thursday night, and a shower is possible, but most areas will likely be dry due to the loss of heating. Long term Friday through Tuesday Upper level ridging will remain centered over the southeastern Friday and Saturday. Meanwhile, a cold front will be located near or south of the area Friday. With ridging shunted to the west, this should lead to slightly cooler and less humid conditions. A narrow ridge of surface high pressure will move

overhead Friday night. A low pressure system will be moving north of the great lakes on Saturday. The system's warm sector will translate eastward through the day, although there's some uncertainty if the upper ridge will remain strong enough to suppress any convection. The best chance of any showers and storms will be over the terrain and closer to the pennsylvania border. The shortwave trough aloft will suppress the ridge to the south, resulting in a more zonal flow aloft across the mid atlantic for the second half of the weekend. This will slow the cold front's southward progress and allow it to waver across the area into early next week. This will result in mainly diurnal chances of showers and thunderstorms Sunday into Monday. There's some consensus on another shortwave being able to shove the front south by Tuesday, with high pressure to follow (briefly). With the absence of any strong pushes of canadian air, temperatures will likely run above normal through early next week. Aviation 01z Wednesday through Sunday Vfr conditions are expected through Wednesday under light flow. A few showers are possible overnight Wednesday into Thursday morning, and an isolated thunderstorm cannot be ruled out but confidence is low. There is a chance for thunderstorms Thursday afternoon and evening, and if storms develop they have the potential to become severe. However, confidence remains low at this time. High pressure will provideVFR conditions for Friday and much of Saturday. A stray shower or thunderstorm is possible by Saturday and Sunday afternoons, with the highest chance near mrb at this time. Marine Winds have diminished below criteria this evening. There may be a brief pressure surge overnight into early Thursday morning and winds from the northeast may gust close to SCA criteria across the middle portion of the bay. However, confidence is too low for an SCA at this point. Southerly winds will develop around the departing high Wednesday. A warm front will pass through the water late Wednesday night through Thursday morning before another cold front from the north stalls out near the waters Friday. A small craft advisory may be needed for portions of the waters late Wednesday night through Friday. Strong to perhaps severe thunderstorms are possible Thursday afternoon into Thursday evening, but confidence for them to occur is low at this time. Northwest winds behind a cold front may result in SCA conditions on Friday. High pressure will bring lighter winds Friday night before turning southwesterly Saturday. Another cold front will approach on Sunday, with wind direction and speeds of lower confidence due to its slow movement. A stray thunderstorm could also occur during this time. Lwx watches warnings advisories Dc... None. Md... None. Va... None. Wv... None. Marine... None. Synopsis... Bjl near term... Bjl imr short term... Bjl long term... Ads aviation... Bjl ads imr marine... Bjl ads imr

---

Weather Reporting Stations

   EDIT       (on/off)   Help   NOTE: Click on distance to see the station location on a map

Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
WASD2 - 8594900 - Washington, DC	14 mi	40 min	NNW 4.1 G 7	69°F	69°F		1019.5 hPa
NCDV2	25 mi	40 min	NW 1.9 G 2.9	66°F	73°F		1018.6 hPa
44062 - Gooses Reef, MD	37 mi	46 min	NNW 9.7 G 12	67°F			1019.8 hPa
TPLM2 - Thomas Point, MD	38 mi	34 min	NW 7 G 8	66°F	67°F		1020.3 hPa (+2.0)	46°F
APAM2 - 8575512 - Annapolis, MD	39 mi	40 min		65°F			1018.8 hPa
44063 - Annapolis	40 mi	40 min	NNW 5.8 G 7.8	67°F	67°F		1019.3 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD	42 mi	40 min	N 15 G 16	67°F			1019.9 hPa
SLIM2 - 8577330 - Solomons Island, MD	42 mi	40 min	N 8 G 8.9	67°F	69°F		1018.9 hPa
CPVM2	44 mi	40 min		66°F				47°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	48 mi	40 min	NW 8 G 8	69°F			1019.3 hPa
FSNM2	48 mi	40 min	WNW 7 G 8	68°F			1019.2 hPa
PPTM2 - 8578240 - Piney Point, MD	48 mi	40 min	NNE 6 G 7
BLTM2 - 8574680 - Baltimore, MD	49 mi	40 min	N 4.1 G 7	68°F	71°F		1019 hPa

Wind History for Washington, DC

(wind in knots)    EDIT      (on/off)   Help

11 PM

12 AM

1 AM

2 AM

3 AM

4 AM

5 AM

6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

3 PM

4 PM

5 PM

6 PM

7 PM

8 PM

9 PM

10 PM

Last 24hr

NW11 G18

NW9 G18

NW7 G14

NW7 G14

NW8 G11

NW8 G15

N6 G11

NW4 G8

NW10 G15

NW7 G12

NW10 G13

NW11

N4 G15

NW13 G16

NW6 G12

W5 G12

W5 G13

NW4 G14

NW10 G14

NW4 G9

NW6

NW8 G11

N6 G10

NW3

1 day ago

S8

S7

S6 G9

S6

S6 G9

S6 G11

S9

S5

S5

S6 G9

SW5 G9

S8

S11

S11

W9 G17

SW6 G13

SW9 G17

SW11 G17

S12 G15

W2

NW4 G12

NW4 G8

NW5

NW7

2 days ago

S5

SE7

SE7 G12

N1 G4

S1

S3

SE1

--

S1

SW2

S3

S5

S5

S4 G7

S6

S9 G12

S9 G12

S10

S13 G17

S11 G14

S10 G13

S6

S6 G9

S4 G7

---

Airport Reports

    EDIT      (on/off)   Help   Click EDIT to display multiple airports

Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Fort Belvoir, VA	5 mi	98 min	NW 4	10.00 mi	Partly Cloudy	66°F	44°F	46%	1019.2 hPa
Washington/Reagan National Airport, DC, VA	13 mi	42 min	N 7	10.00 mi	Mostly Cloudy	65°F	44°F	47%	1019.5 hPa
Camp Springs / Andrews Air Force Base, MD	16 mi	98 min	N 5	10.00 mi	Overcast	66°F	42°F	42%	1019.2 hPa
Quantico Marine Corps Airfield - Turner Field, VA	16 mi	98 min	N 5	10.00 mi	Overcast	69°F	45°F	42%	1019.2 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA	22 mi	38 min	NNE 6	10.00 mi	Partly Cloudy	66°F	45°F	47%	1020.8 hPa
College Park Airport, MD	23 mi	51 min	N 0	10.00 mi	Fair	60°F	46°F	61%	1019.3 hPa

Wind History from DAA (wind in knots)

10 PM

11 PM

12 AM

1 AM

2 AM

3 AM

4 AM

5 AM

6 AM

7 AM

8 AM

9 AM

10 AM

11 AM

12 PM

1 PM

2 PM

3 PM

4 PM

5 PM

6 PM

7 PM

8 PM

9 PM

Last 24hr

NW3

NW9

NW15 G21

NW6 G15

NW8

NW7

NW10 G15

NW4

NW5

N3

NW13 G18

NW12 G20

NW15 G19

N6

NW14 G18

NW11 G15

NW5

NW6

NW8

NW8

NW8

NW7

N5

NW4

1 day ago

S4

S5

SE4

SE6

SE3

S4

S6

SW4

Calm

Calm

SW5

W6

SW6

S5

S8

SW8

SW8 G16

W6 G16

S7

S9

S6

S4

E3

Calm

2 days ago

Calm

Calm

Calm

NE4

SE5

SE4

Calm

Calm

Calm

Calm

SE4

SE3

SW4

SE5

S3

S7

SE6

SE8

SE7

S9

S6

S4

S4

S4

---

Tide / Current Tables for Marshall Hall, Maryland

   EDIT   Weekend mode (on/off)   (on/off)   Help   One Week of Data

---

Tide / Current Tables for High Point, Occoquan Bay, Virginia

   EDIT      (on/off)   Help   One Week of Data

---

Weather Map and Satellite Images

       (on/off)   HelpWeather Map

GOES Local Image of    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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East

---

Wind Forecast for Baltimore, MD/Washington (22,6,7,8)

      (on/off)   Help

---

Ground Weather Radar Station Sterling, VA

   (on/off)   Help

---

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.