Thursday, August22, 2019 L-36.com


Marine Weather and Tides
Washington, DC

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

Sunrise 6:26AMSunset 7:55PM Thursday August 22, 2019 10:41 PM EDT (02:41 UTC) Moonrise 10:46PMMoonset 11:58AM Illumination 50% Phase: Third Quarter Moon; Moon at 22 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- 1036 Pm Edt Thu Aug 22 2019
Rest of tonight..W winds 5 kt. Waves less than 1 ft. Scattered showers. Scattered tstms late this evening, then isolated tstms.
Fri..N winds 5 kt. Waves less than 1 ft. A chance of showers.
Fri night..N winds 5 kt. Waves less than 1 ft.
Sat..NE winds 5 kt. Waves less than 1 ft.
Sat night..NE winds around 5 kt. Waves 1 ft.
Sun..NE winds 5 to 10 kt. Waves 1 ft.
Sun night..NE winds 5 kt. Waves less than 1 ft.
Mon..NE winds 5 kt. Waves less than 1 ft. A chance of showers.
Tue..SE winds 5 kt. Waves less than 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1036 Pm Edt Thu Aug 22 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will approach the waters tonight, then stall over the carolinas on Saturday. High pressure will then settle over the area Saturday into Sunday. Small craft advisories are possible over the southern waters Friday night through Sunday .


7 Day Forecast for Marine Location Near Washington, DC
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location: 38.89, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 230154
afdlwx
area forecast discussion
national weather service baltimore md washington dc
954 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 until 6 am Friday morning
There is currently ongoing convection over portions of
maryland... Mainly near the baltimore metro area and over the
northern portion of the chesapeake bay. This main area will
continue to move east-southeast away from us with some
lingering showers thunderstorms continuing over the next hours.

A cold front sits to our north and is expected to continue to
move southeastward and into our cwa. This will continue the
chance of scattered showers overnight across portions of the
region. Lows will range through the 60s to low 70s.

Short term 6 am Friday morning 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 02z Friday through Tuesday
MainlyVFR conditions are expected through tonight. Isolated to
scattered showers and thunderstorms may cause restrictions the
next hours. 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 moving across portions of
the waters this evening -some with smws at this moment-.

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 imr
short term... Mm
long term... Cjl
aviation... Mm imr cjl
marine... Mm imr cjl


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 1 mi53 min W 5.1 G 8.9
BSLM2 - Chesapeake Bay, MD 19 mi131 min S 2.9 83°F 1012 hPa74°F
APAM2 - 8575512 - Annapolis, MD 30 mi53 min 76°F 1013 hPa
TPLM2 - Thomas Point, MD 31 mi41 min NNW 12 G 13 77°F 83°F1014.7 hPa (+2.3)69°F
BLTM2 - 8574680 - Baltimore, MD 35 mi59 min NNE 5.1 G 7 73°F 85°F1013.7 hPa
CPVM2 35 mi53 min 76°F 75°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 35 mi53 min N 2.9 G 4.1 73°F 1014 hPa
FSNM2 35 mi65 min N 2.9 G 6 71°F 1013.9 hPa
NCDV2 39 mi59 min WSW 7 G 11 76°F 90°F1012.8 hPa
44062 - Gooses Reef, MD 40 mi53 min W 14 G 16 82°F 1014.4 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 47 mi59 min NNW 16 G 18 72°F 84°F1016 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi53 min W 9.9 G 19 80°F 1014.1 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi49 minWSW 710.00 miOvercast84°F69°F61%1013.8 hPa
Camp Springs / Andrews Air Force Base, MD9 mi45 minSW 710.00 miMostly Cloudy80°F69°F70%1014.3 hPa
College Park Airport, MD9 mi58 minN 310.00 miMostly Cloudy75°F64°F71%1013.9 hPa
Fort Belvoir, VA14 mi45 minSW 510.00 miMostly Cloudy81°F69°F70%1013.5 hPa
Fort Meade / Tipton, MD20 mi59 minN 03.00 miOvercast70°F69°F100%1014.6 hPa
Gaithersburg - Montgomery County Airport, MD21 mi45 minN 08.00 miPartly Cloudy71°F69°F94%1015.5 hPa
Washington/Dulles International Airport, DC, VA23 mi49 minN 010.00 miPartly Cloudy79°F66°F67%1013.4 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrS4S6S4CalmN3SW3SW3SW3SW3W44NW9W116
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1 day agoS7S8W4W6W6S5SW5SW7SW6SW7SW8SW10S11S14S10SW12S9S14S14S12E9S3S4NE5
2 days agoSW5SW5SE4SW6W5N4N6N4N4N4NE5NE5E5E7SE8SE7E10SE7E7E16
G27
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Tide / Current Tables for Washington, Potomac River, D.C.
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Bladensburg, Anacostia River, Maryland
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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.
Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (22,6,7,8)
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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.