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Marine Weather and Tides Mount Vernon, VA Version 3.4

NOTICE 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

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Sunrise 5:43AM

Sunset 8:38PM

Tuesday June 25, 2019 9:31 AM EDT (13:31 UTC)

Moonrise 12:23AM

Moonset 12:23PM

Illumination 45%

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.

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7 Day Forecast for Marine Location Near Mount Vernon, VA

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Area Discussion for - Baltimore, MD/Washington

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Fxus61 klwx 250800 afdlwx area forecast discussion national weather service baltimore md washington dc 400 am edt Tue jun 25 2019 Synopsis A weak front will cross the area today. High pressure will build from the tennessee valley toward the region through the end of the week. A cold front may approach from pennsylvania this weekend. Near term until 6 pm this evening Convective complex has maintained itself with the help of a low level jet and persistent elevated instability. Convective trends are finally weakening and any lingering showers will be exiting to the east by 6 am. Very subtle surface features today, as a front trough axis crosses the area. While the wind shift will occur early in the day, the (slight) drop in dew points will arrive in the afternoon. Some of the cams are trying to kick off a few showers as this boundary crosses, but have doubts as forecast soundings indicate the cumulus later will be very shallow with very dry air above it. Have kept forecast dry. While there is a smidge of cold advection aloft, westerly downslope flow and plentiful sunshine will allow temperatures to range from the mid 80s to around 90. Short term 6 pm this evening through Thursday night Surface high pressure will build from the west tonight and generally remain positioned there through Thursday night. This will keep flow from more of a westerly direction, so dew points won't be rising too dramatically through the middle of the week. However, 850 mb thermal ridge will slowly expand eastward, so temperatures will climb a bit each day, with more widespread 90s by Thursday (with some heat indices reaching the upper 90s). Lows tonight may be the coolest of the week, ranging from the 50s in rural valley to around 70 in the urban centers... Then becoming a bit warmer with each successive night. A weak boundary will be located to the north Wednesday and may try to drop south toward the area Thursday. However, there will be limited moisture and convergence along it, and the best mid level forcing will likely remain north of the area. It still looks like Wednesday would be the favored day for a stray shower or storm to drift into northern parts of the CWA during the late afternoon or evening, but overall dry conditions are expected. Long term Friday through Monday Mid-upper level ridging continues into Friday, likely near its maximum. This will result in hot and dry conditions across the region. High temperatures on Friday will reach into the mid 90s. Not expecting a strong SW flow at the surface, so humidity will not be as oppressive, with dew points in the mid 60s or so, keeping heat indices below the century mark, but could still be in the mid-upper 90s. A weak front looks to push through the area on Saturday, associated with a trough moving across the northeastern u.S. This will result in an increased chance for showers and storms. Not seeing much in terms of cooler temperatures, but could be a degree or two cooler, given the height falls that are occurring ahead of the system. Then

on Sunday, could see another quick cold front push through the region, with yet another chance for some showers storms Sunday afternoon. High temperatures could cool a bit Sunday into the upper 80s. Mid-upper level ridging tries to build back on for the early part of the week, but the upper trough off the northeast coast is stubborn to move. Guidance shows some mid-upper level features rotating around the periphery of the ridge, which could result in some showers and storms, if they come through during peak heating in the afternoon on Monday Tuesday. Seems less likely Monday, but Tuesday looks to have a better shot as the ridge may begin to break down. Highs will reach the mid 80s on Monday, and may even be slightly cooler on Tuesday, depending on how the ridge develops. Aviation 08z Tuesday through Saturday Showers and storms are exiting to the east early this morning, and it seems unlikely any aviation hazards will occur through Thursday as high pressure builds in from the west. Winds will shift to westerly this morning, and there may be a few gusts up to 20 kt. Otherwise light winds are expected through the middle of the week. Vfr conditions expected throughout the long-term period. Although, brief reductions could be possible Saturday afternoon with any showers storms that may develop, particularly at the northern most terminals. Marine Occasional southwesterly gusts around 20 kt are occurring over the wider waters of the bay early this morning, but should be subsiding as a low level jet weakens. A trough axis will pass this morning and shift winds to the west. While a few gusts may reach SCA criteria, especially over the northern bay, am thinking the duration would be brief as pressure surge isn't that strong. Most model guidance is indicating a general 10-15 kt. Winds will remain below SCA criteria Friday and Saturday. However, brief gusty winds could be possible with any storms that may develop on Saturday. Not expecting any sort of widespread severe threat though at this time. Lwx watches warnings advisories Dc... None. Md... None. Va... None. Wv... None. Marine... Small craft advisory until 6 am edt early this morning for anz532>534-537-540-541-543. Synopsis... Ads near term... Ads short term... Ads long term... Cjl aviation... Ads cjl marine... Ads cjl

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Weather Reporting Stations

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Stations	Dist	Age	Wind	Air Temp	Water Temp	Waves	Pressure	DewPt
WASD2 - 8594900 - Washington, DC	14 mi	49 min	WNW 6 G 8.9	77°F	80°F		1011.4 hPa
NCDV2	25 mi	49 min	NW 4.1 G 8	79°F	79°F		1010.6 hPa
TPLM2 - Thomas Point, MD	38 mi	31 min	W 8.9 G 9.9	76°F	76°F		1012.1 hPa (+2.1)	72°F
APAM2 - 8575512 - Annapolis, MD	39 mi	43 min		82°F			1010.4 hPa
44063 - Annapolis	40 mi	19 min	N 9.7 G 12	77°F	77°F		1011.2 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD	42 mi	43 min	NNW 14 G 17	77°F			1011.7 hPa
SLIM2 - 8577330 - Solomons Island, MD	42 mi	43 min	NW 11 G 16	79°F	77°F		1010.7 hPa
CPVM2	44 mi	43 min		78°F				76°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	48 mi	43 min	WNW 8 G 9.9	77°F			1010.6 hPa
FSNM2	48 mi	55 min	WNW 12 G 14	77°F			1010.7 hPa
PPTM2 - 8578240 - Piney Point, MD	48 mi	44 min	NNW 14 G 16
BLTM2 - 8574680 - Baltimore, MD	49 mi	49 min	NNW 6 G 9.9	78°F	78°F		1010.2 hPa

Wind History for Washington, DC

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Airport Reports

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Airport	Dist	Age	Wind kt	Visibility	Sky/Weather	Temp	DewPt	Humidity	Pressure
Fort Belvoir, VA	5 mi	35 min	NW 5	10.00 mi	Fair	78°F	69°F	75%	1011.8 hPa
Washington/Reagan National Airport, DC, VA	13 mi	39 min	Var 5	10.00 mi	Overcast	78°F	66°F	67%	1011.6 hPa
Camp Springs / Andrews Air Force Base, MD	16 mi	95 min	WNW 8	10.00 mi	Fair	75°F	68°F	79%	1011.3 hPa
Quantico Marine Corps Airfield - Turner Field, VA	16 mi	35 min	WNW 3	10.00 mi	Fair	79°F	73°F	82%	1012 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA	22 mi	35 min	NNW 6	10.00 mi	Fair	77°F	69°F	77%	1012.8 hPa
College Park Airport, MD	23 mi	48 min	NNW 3	10.00 mi	Partly Cloudy	75°F	66°F	74%	1011.2 hPa

Wind History from DAA (wind in knots)

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Tide / Current Tables for Marshall Hall, Maryland

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

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Weather Map and Satellite Images

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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

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Wind Forecast for Baltimore, MD/Washington (9,2,3,4)

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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.