Monday, April24, 2017 L-36.com


Marine Weather and Tides
Brookmont, MD

Version 3.4
What's New / NOTES
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
This was requested by a user. If you have requests, please let me know.

Sunrise 6:16AMSunset 7:56PM Monday April 24, 2017 9:22 AM EDT (13:22 UTC) Moonrise 4:24AMMoonset 4:54PM Illumination 3% Phase: Waning Crescent; Moon at 28 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- 732 Am Edt Mon Apr 24 2017
.small craft advisory in effect through Tuesday afternoon...
Today..NE winds 10 kt. Gusts up to 20 kt late this morning and afternoon. Waves 1 ft. Periods of rain.
Tonight..NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Periods of rain.
Tue..NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Periods of rain.
Tue night..N winds 5 to 10 kt. Waves 1 ft. Rain likely.
Wed..NW winds 5 kt. Waves less than 1 ft.
Wed night..S winds around 5 kt. Waves 1 ft.
Thu..S winds 5 to 10 kt. Waves 1 ft.
Fri..SW winds 5 kt. Waves less than 1 ft.
ANZ500 732 Am Edt Mon Apr 24 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A cold front will remain stalled south of the waters through Tuesday. Low pressure will slowly move along the boundary toward the mid-atlantic coast over the next couple days. The low will finally move away from the area Wednesday. A cold front will approach the waters from the west late this week. A gale warning may be needed for portions of the waters Tuesday. A small craft advisory will likely be needed for portions the waters Tuesday night.

7 Day Forecast for Marine Location Near Brookmont, MD
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location: 38.92, -77.1     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 241043 aaa
afdlwx
area forecast discussion... Updated
national weather service baltimore md/washington dc
643 am edt Mon apr 24 2017

Synopsis
Low pressure over georgia will gradually move northeastward,
reaching the south carolina coast this evening, the north
carolina coast Tuesday evening, and finally off the mid-
atlantic Wednesday. A cold front will approach the region late
Thursday or early Friday and remain nearby through the weekend.

Near term /through tonight/
Cutoff low pressure over the southeastern CONUS this morning
will slowly drift northeast into the carolinas this afternoon
through tonight. High pressure remains over new england.

A northeast flow between these systems will continue to usher in
unusually cool conditions for this time of year. At the same
time... Warm and moist air rotating around the low will overrun
the surface cooler air in place resulting in plenty of clouds
along with periods of rain.

The steadiest rain will be over the potomac highlands into
central virginia through early this afternoon... Where forcing
will be stronger closer to the cutoff low and overrunning will
be deeper. Farther north across the washington and baltimore
metropolitan areas into northern maryland and easter west
virginia... Rain will be light and more intermittent as it fights
dry air advection at the low-levels. However... As the low tracks
a bit farther north and east later today through tonight.

Overrunning will deepen across all locations and rain is
expected to become more widespread. Rainfall amounts across
central virginia into the potomac highlands will be around one-
half to one inch today through tonight. Rainfall amounts around
one-quarter to one-half inch are expected across most other
locations.

Short term /Tuesday through Wednesday night/
Low pressure will remain nearly stationary Tuesday over the
carolinas before slowly moving off to the north and east Tuesday
night through Wednesday. A soaking rain is expected across most
locations Tuesday along with plenty of clouds. Tuesday will be a
bit milder compared to Monday... Due to more of an easterly flow
instead of northeast but still well below climo. MAX temps will
hold in the 50s for most areas with lower to middle 60s across
the virginia piedmont into southern maryland. Rain will
gradually diminish in coverage Tuesday night through midday
Wednesday as the low weakens and slowly moves away. Wednesday
will turn out milder as weak high pressure builds overhead.

Clouds should give way to sunshine across the potomac highlands
and central shenandoah valley. Elsewhere... Some breaks of
sunshine are possible later in the day but clouds will be
stubborn to break since they will be trapped underneath a strong
subsidence inversion. This will impact temperatures... And this
leads to high uncertainty. Tweaked MAX temps down a few degrees
across central and eastern portions of the cwa. If clouds hang
on all day... Then MAX temps will hold in the lower to middle
60s but if clouds break sooner then MAX temps will be well into
the 70s.

The low will track well off to our north and east Wednesday
night and weak high pressure will build overhead. Areas of fog
are possible due to saturated soils and light winds.

Long term /Thursday through Sunday/
Cold front forecast to be draped from michigan southward to
mississippi/alabama by 12z Thursday... With blocking high over
the atlantic. Front will try to push into the area... But will
likely stall out nearby... As it struggles to make progress into
the area due to the aforementioned blocking high. Front expected
to remain nearby through the weekend... With a persistent flow of
warm/moist air advecting into the region. This will allow for
warm/humid conditions to develop... With dewpoints climbing into
the m/u60s by the weekend and temperatures in the m/u80s.

Increasing instability will promote thunderstorm
activity... Coverage initially appears to be isolated or widely
scattered for the end of the week... As capping inversion and
weak forcing reside over the area.

Juicy airmass remains through early next week... With diurnally-
driven thunderstorms chances remaining until moisture is scoured
out with next frontal passage. Continued moistening will lead
to moderate/strong instability over the weekend... With strong
storms possible. Front likely focus for development... So will
need monitor spatiotemporal forecast trends of front over the
next several days.

Aviation /12z Monday through Friday/
Low pressure will track toward the carolinas today and remain
nearly stationary through Tuesday before slowly moving away from
the area Tuesday night through Wednesday. Warm and moist air
will overrun cooler air near the surface... Resulting in low
clouds along with periods of rain. Timing of the lower cigs
remains uncertain because drier air is advecting in at the lower
levels. For now... It looks like best chance of MVFR through
mid-morning will remain across kcho withVFR elsewhere.

Most guidance continues to hint at low-level drier air advecting
into the area through most of this afternoon. Therefore...VFR
conditions may persist for most of the terminals. Did allow for
MVFR conditions for kcho but even there confidence is low.

Intermittent light rain is expected during this time.

Overrunning will deepen late this afternoon through Tuesday and
this will increase rainfall coverage and lower CIGS to ifr
levels. Low clouds will persist through at least Wednesday
morning before possibly breaking up Wednesday afternoon. Areas
of fog are possible Wednesday night due to saturated
soils and light winds as high pressure builds overhead.

Vfr conditions Thursday.VFR should prevail Friday... Though,
isolated to widely scattered thunderstorms possible (especially
during the afternoon/evening).

Marine
Low pressure will track across the southeastern CONUS this
morning before becoming nearly stationary over the carolinas
this afternoon through Tuesday. The pressure gradient between
the low and the high will strengthen during this time. A small
craft advisory is in effect for the waters. A gale warning may
be needed for middle portions of the maryland chesapeake bay and
the lower tidal potomac river Tuesday. The strongest winds will
be Tuesday morning through midday. The low will weaken Tuesday
night and slowly move away from the area Wednesday. A small
craft advisory may need to be extended into Tuesday night for
portions of the waters. Winds will remain below SCA criteria
Wednesday through Wednesday night as weak high pressure builds
overhead.

Increasing southerly flow Thursday with wind gusts approaching sca
criteria. Winds decrease some Friday... Though isolated to widely
scattered thunderstorms possible (especially during the
afternoon/evening).

Tides/coastal flooding
Easterly flow around low pressure to the south will foster
persistent onshore flow over the waters through Tuesday... Which
will keep tidal anamolies elevated. Onshore flow will
strengthen a bit today through Tuesday... With minor flooding
possible near times of high tide. Though, it currently appears
that all sites will remain below minor tidal flood stage for the
next high tide cycle (still need to watch straits). Better
chance for minor tidal flooding this evening into
Tuesday... Especially at the most sensitive sites (annapolis,
straits, and dc). The flow should gradually turn north Tuesday
night into Wednesday as the low moves away from the area. Water
levels should decrease during this time.

Lwx watches/warnings/advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

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

Synopsis... Bjl
near term... Bjl
short term... Bjl
long term... Mse
aviation... Bjl/mse
marine... Bjl/mse
tides/coastal flooding... Mse


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 5 mi53 min NNE 5.1 G 8 54°F 66°F1018.8 hPa
APAM2 - 8575512 - Annapolis, MD 33 mi53 min 52°F 1018.8 hPa
TPLM2 - Thomas Point, MD 35 mi83 min NNE 15 G 17 52°F 58°F48°F
44063 - Annapolis 35 mi43 min NE 16 G 19 52°F 1019.2 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi53 min NE 8 G 9.9 53°F 1019.7 hPa
BLTM2 - 8574680 - Baltimore, MD 37 mi53 min E 7 G 8.9 53°F 62°F1019.5 hPa
FSNM2 37 mi53 min NE 6 G 8.9 53°F 1019.3 hPa
CPVM2 38 mi53 min 52°F 47°F
44043 - Patapsco, MD 41 mi43 min ENE 14 G 18 52°F 1020.1 hPa
NCDV2 42 mi53 min NNE 1.9 G 6 51°F 64°F1017.3 hPa
44062 - Gooses Reef, MD 44 mi43 min NE 16 G 19 54°F 1018.8 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA6 mi31 minNE 137.00 miLight Rain53°F48°F86%1019.2 hPa
College Park Airport, MD10 mi42 minNNE 410.00 miOvercast52°F46°F81%1019.3 hPa
Fort Belvoir, VA14 mi25 minNNE 410.00 miLight Drizzle51°F46°F83%1018.9 hPa
Camp Springs / Andrews Air Force Base, MD14 mi25 minNNE 1110.00 miOvercast51°F45°F82%1019 hPa
Washington/Dulles International Airport, DC, VA19 mi31 minNE 910.00 miOvercast53°F48°F83%1018.9 hPa
Fort Meade / Tipton, MD21 mi44 minNE 510.00 miOvercast52°F46°F82%1020.3 hPa

Wind History from DCA (wind in knots)
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Last 24hrNE6NE10E4E4N3NE8E3SE7SE7E4SE5E5E4E4NE5E6E6E5E5E7NE8NE8NE10NE13
1 day agoNE10NE11N8N11N12NE10N10N11N13N12NE7N11NW9NW5NW5NW6N8N10N11N10N10N9N12NE10
2 days agoCalmNE5NE4NE4E5NE6E4SE9E4CalmS8S5CalmNE10NE11NE8NE6NE7NE8NE9NE5NE8NE8NE7

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Mon -- 01:37 AM EDT     0.32 feet Low Tide
Mon -- 05:24 AM EDT     Moonrise
Mon -- 06:19 AM EDT     Sunrise
Mon -- 07:21 AM EDT     3.41 feet High Tide
Mon -- 02:18 PM EDT     0.26 feet Low Tide
Mon -- 05:53 PM EDT     Moonset
Mon -- 07:49 PM EDT     3.21 feet High Tide
Mon -- 07:54 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.40.30.71.52.43.13.43.32.92.21.50.90.50.30.40.91.82.63.13.22.92.31.6

Tide / Current Tables for Reagan National Airport, Washington, D.C.
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Reagan National Airport
Click for Map
Mon -- 01:24 AM EDT     0.31 feet Low Tide
Mon -- 05:23 AM EDT     Moonrise
Mon -- 06:18 AM EDT     Sunrise
Mon -- 07:09 AM EDT     3.60 feet High Tide
Mon -- 02:05 PM EDT     0.24 feet Low Tide
Mon -- 05:53 PM EDT     Moonset
Mon -- 07:36 PM EDT     3.39 feet High Tide
Mon -- 07:54 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.60.30.40.81.82.73.43.63.42.92.21.40.90.40.20.41.12.12.93.33.432.31.5

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Mid-Atlantic    EDIT
Geos

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