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Marine Weather and Tides George Mason, VA Version 3.4

NOTICE 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 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 6:27AM

Sunset 7:56PM

Thursday August 22, 2019 2:49 PM EDT (18:49 UTC)

Moonrise 10:48PM

Moonset 11:59AM

Illumination 53%

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 George Mason, VA

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Area Discussion for - Baltimore, MD/Washington

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Fxus61 klwx 221842 afdlwx area forecast discussion national weather service baltimore md washington dc 242 pm edt Thu aug 22 2019 Synopsis A cold front will cross the area late tonight into Friday, then move into the carolinas over the weekend. Canadian high pressure will build north of the region over the weekend as low pressure forms off the southeast coast and slides by near or east of the area Monday into Tuesday. Near term through tonight Hot and humid conditions exist out there again today ahead of an approaching cold front and upper level trough. High temperatures will peak in the low to mid 90s, with heat index values from the mid 90s to low 100s. This warmth humidity will allow for the development of 1000-1500 j kg of MLCAPE by later this afternoon, although it will remain largely capped for much of the afternoon hours. There is currently ongoing convection across portions of central and western va which developed off a remnant MCS from earlier this morning. This will progress eastward across portions of central va over the next several hours. Another focus for possible convective activity across the region will then be some upper level energy moving east- northeastward out of ky WV early this afternoon, which will cross the region during the evening hours. Convective allowing models are not in sound agreement with its evolution, but there is potential for additional scattered convection during the evening hours, possibly across the metros. A third focus may then present itself as the cold front moves southeastward from pa late this evening, with portions of eastern WV and northern central md having the chance at scattered showers thunderstorms. Given the mlcape mentioned above, in addition to large amounts of dcape (>1000 j kg), and 20-30 knots of effective shear, some isolated severe thunderstorms are possible, with localized damaging winds likely the greatest threat, but it is a marginal conditional threat. Some scattered showers will likely linger overnight across portions of the region as the front slowly moves southward. Lows will range through the 60s to low 70s. Short term Friday through Saturday night The front will continue its track southward through the day Friday and likely be nearing the nc va border by the evening. However strong southwest flow will remain aloft with upper level energy traversing the region, so rain showers are likely, especially across central western va, into the mid afternoon hours. A few thunderstorms with locally heavy rain are possible as well. Otherwise, mostly cloudy skies and cooler temperatures are expected. Highs from the upper 70s to around 80f. Cool and dry air will continue its progression southward into the region Friday night. Lows will drop into the upper 50s to mid 60s. A ridge of high pressure will be in control on Saturday with mostly sunny skies and highs in the upper 70s to low 80s. Lows Saturday night will once again be in the upper 50s to mid 60s. Long term Sunday through Thursday High pressure will be set up across the northeast on Sunday, resulting in relatively dry and cooler than average temperatures. Highs will only reach the upper 70s low 80s. With a departing upper low, and onshore low-level flow, can't rule out a shower or some drizzle on Sunday. On Monday and Tuesday, the forecast is a bit murky at this point. Ridging along the eastern seaboard will lead to the formation of a

stationary front along the east coast. Meanwhile, a weak wave of low pressure will be moving out of the caribbean and up the southeastern coast Sunday into Monday, resulting in the formation of a surface low pressure system somewhere along the southeast coast. This is actually the disturbance that the national hurricane center has outlooked for potential development along the east coast. Then, it is all a matter of where this low tracks, and what form the low takes. The GFS brings the low relatively close the delmarva peninsula, meaning more rain for our eastern zones. Meanwhile, the euro keeps the low farther offshore, but still brings a chance for showers to eastern areas due to onshore surface flow. To sum this up, there is a lot of uncertainty in this portion of the forecast until we start to see the pieces fall into place, which just hasn't happened yet. But depending on how this coastal low develops (still some uncertainty if it will become tropical subtropical in nature), and which direction it moves, the forecast could change drastically in the coming days. For now, will keep chance pops in the forecast, with a slight potential for some embedded thunderstorms. Monday and Tuesday should remain near to slightly below average in terms of temperatures, with highs in the low 80s. On Wednesday, showers and thunderstorm chances increase due to an approaching cold front. This should also push the coastal low off to the north and east (if it does indeed track up our way). Regardless, yet another afternoon with showers and storms across the region. Aviation 18z Thursday through Tuesday MainlyVFR is expected through today and tonight. Isolated to scattered showers and thunderstorms are possible this afternoon and evening. A cold front will then cross the area late tonight into early Friday with additional chances for showers and possibly some MVFR stratus. High pressure builds for the weekend withVFR returning. Vfr conditions expected on Monday. A passing shower or light drizzle may pass over a terminal, primarily in the vicinity of bwi mtn dca, but shouldn't cause any real issues. Monday is a bit more tricky, with the potential for a coastal low riding up the east coast. For now, thinking it is more likely that we see primarilyVFR conditions. However, if some of the guidance is correct, we could see a prolonged period of sub-vfr conditions late Monday into Tuesday. For now, leaning with the drier side of guidance. Marine Gusty showers and thunderstorms are possible late today or this evening and may require smws. Otherwise sub-sca conditions are expected through tonight and Friday. Winds will increase out of the north late Friday and Friday night and SCA conditions are possible late Friday and Saturday. A stiff easterly to northeasterly flow along the chesapeake bay will bring us close to SCA criteria on both Sunday and Monday afternoon. Monday is a little more uncertain, as a coastal low may pass nearby, which could result in stronger winds. Right now, keeping things close to SCA criteria. Lwx watches warnings advisories Dc... None. Md... None. Va... None. Wv... None. Marine... None. Synopsis... Mm near term... Mm short term... Mm long term... Cjl aviation... Mm cjl marine... Mm 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	15 mi	50 min	WNW 6 G 8	90°F	84°F		1013.7 hPa (-1.2)
BSLM2 - Chesapeake Bay, MD	32 mi	140 min	W 5.1	87°F			1014 hPa	71°F
NCDV2	39 mi	50 min	SW 1.9 G 4.1	90°F	86°F		1013.3 hPa (-1.0)
APAM2 - 8575512 - Annapolis, MD	45 mi	50 min		91°F			1012.8 hPa (-1.1)
TPLM2 - Thomas Point, MD	46 mi	50 min	WSW 7 G 9.9	87°F	84°F		1014.4 hPa (-1.1)	66°F
BLTM2 - 8574680 - Baltimore, MD	48 mi	50 min	N 5.1 G 9.9	90°F	85°F		1012.6 hPa (-1.0)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD	49 mi	50 min	WNW 4.1 G 7	88°F			1013.2 hPa (-0.9)
FSNM2	49 mi	56 min	W 9.9 G 13				1013.1 hPa

Wind History for Washington, DC

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

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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	10 mi	1.9 hrs	W 4	10.00 mi	A Few Clouds	91°F	67°F	46%	1014.1 hPa
Washington/Dulles International Airport, DC, VA	11 mi	58 min	Var 4	10.00 mi	Mostly Cloudy	91°F	66°F	45%	1013.5 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA	14 mi	54 min	WSW 8	10.00 mi	Partly Cloudy	92°F	70°F	49%	1014.1 hPa
Washington/Reagan National Airport, DC, VA	14 mi	58 min	NW 10 G 17	10.00 mi	Mostly Cloudy	93°F	64°F	40%	1013.8 hPa
Leesburg / Godfrey, VA	22 mi	75 min	W 4	mi	Fair	90°F	71°F	55%	1014.6 hPa
College Park Airport, MD	22 mi	67 min	NW 7	10.00 mi	Fair	89°F	63°F	42%	1013.9 hPa
Camp Springs / Andrews Air Force Base, MD	23 mi	54 min	WNW 7	10.00 mi	A Few Clouds	90°F	66°F	46%	1014.3 hPa
Quantico Marine Corps Airfield - Turner Field, VA	23 mi	54 min	SSE 5	10.00 mi	Mostly Cloudy	90°F	70°F	52%	1014.2 hPa
Gaithersburg - Montgomery County Airport, MD	24 mi	54 min	Var 5	10.00 mi	A Few Clouds	88°F	70°F	55%	1015.6 hPa

Link to 5 minute data for KDAA

Wind History from DAA (wind in knots)

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Tide / Current Tables for Chain Bridge, one mile below, D.C.

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Tide / Current Tables for Chain Bridge, D.C.

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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

Other links: Northern Pacific     Contential US     Full GOES-East

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Wind Forecast for Baltimore, MD/Washington (14,3,4,5)

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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.