Thursday, September21, 2017 L-36.com


Marine Weather and Tides
Brookmont, MD

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
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.

Sunrise 6:54AMSunset 7:07PM Thursday September 21, 2017 3:36 PM EDT (19:36 UTC) Moonrise 7:12AMMoonset 7:14PM Illumination 1% Phase: Waxing Crescent; Moon at 1 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- 131 Pm Edt Thu Sep 21 2017
This afternoon..N winds 5 kt. Waves less than 1 ft.
Tonight..NW winds around 5 kt. Waves 1 ft.
Fri..N winds around 5 kt. Waves 1 ft.
Fri night..N winds around 5 kt. Waves 1 ft or less.
Sat..N winds 5 kt. Waves less than 1 ft.
Sat night..NW winds around 5 kt. Waves 1 ft or less.
Sun..NE winds around 5 kt. Waves 1 ft or less.
Mon..NE winds around 5 kt. Waves 1 ft or less.
ANZ500 131 Pm Edt Thu Sep 21 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A ridge of high pressure will remain over the eastern united states through early next week.

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 211805
afdlwx
area forecast discussion
national weather service baltimore md washington dc
205 pm edt Thu sep 21 2017

Synopsis
Warm, high pressure both at the surface and aloft will remain
overhead through the weekend and into next week. Hurricane maria
is expected to remain over the atlantic and well to our
southeast through at least early next week.

Near term until 6 pm this evening
Tropical storm jose continues to be off the coast of new
england, well to our east. It is expected to stay there and
weaken over the next few days. High pressure ridge extends along
the appalachians with its influence over the eastern u.S. A
weak trough of low pressure which brought showers and
thunderstorms to western virginia yesterday has moved south.

Its influence may still bring a stray shower to the far
southwestern corner of the CWA this afternoon, but only a
slight chance. Otherwise, another mostly sunny and warm day with
mainly thin high clouds. Highs today will be well into the 80s
once again, with lows tonight in the 50s and 60s once again.

Winds will be light.

Short term 6 pm this evening through Saturday night
High pressure ridge at the surface will remain more or less
stationary over the appalachians through Saturday night. Aloft,
ridge of high pressure centered over the midwest will continue
to extend its influence across our region, while jose will
continue to meander over the northwest atlantic near new
england. The end result will be continued warm and dry weather,
with the only real weather concern being extent and coverage of
patchy fog each morning. Highs will be well into the 80s Friday
and Saturday with lows in the 50s and 60s. Winds will be light.

Long term Sunday through Thursday
High pressure both at the surface and aloft will control the weather
pattern for Sunday and Sunday night... Bringing more dry and warm
conditions.

The remnants of jose may push closer toward the east coast Monday
and Tuesday... But latest guidance suggests that this remains far
enough out to sea so that it will have little impact on our weather.

Will continue to keep an eye on this because there are still a few
gefs members that bring it farther west into our area which would
bring more clouds and possible precipitation. However... A vast
majority of the GEFS members keep it out to sea long with the latest
deterministic runs of the gfs... ECMWF and ukmet. Therefore... The
most likely scenario is that high pressure both at the surface and
aloft continues to control the weather pattern... Bringing more dry
conditions along with above normal temperatures.

Hurricane maria may approach the east coast of the united states
during the middle portion of next week. Latest guidance suggests
that there is a better chance for this system to remain
offshore... But confidence is still low this far out. Please consult
the national hurricane center for the latest information regarding
the forecast for hurricane maria.

Aviation 18z Thursday through Tuesday
Main concern through the next several days is patchy late night
and early morning fog, mainly at mrb and cho. Vis could drop
briefly to ifr at either or both sites each of the next three
mornings. An MVFR restriction is not out of the question at the
other terminals (except dca). Otherwise,VFR with light winds
should prevail through Saturday night thanks to high pressure.

More of the same into next week. High pressure will control the
weather pattern Sunday through Tuesday. Areas of low clouds and
fog are possible during the overnight and early morning hours
each day.

Marine
High pressure will provide dry weather with sub-sca winds
through the weekend into early next week.

Global models show winds strengthening on Tue as pressure
gradient tightens as hurricane maria gets closer to the mid-atlc
coast middle of next week. For now, it appears small craft
advisories are possible.

Tides coastal flooding
Minor coastal flooding will continue along sensitive tidal shores
over the next several days.

Lwx watches warnings advisories
Dc... Coastal flood advisory until midnight edt tonight for dcz001.

Md... Coastal flood advisory until 5 pm edt this afternoon for
mdz018.

Coastal flood advisory until 9 pm edt this evening for mdz014.

Coastal flood advisory until 7 pm edt this evening for mdz017.

Va... Coastal flood advisory until midnight edt tonight for vaz054.

Wv... None.

Marine... None.



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 5 mi48 min N 2.9 G 6 85°F 75°F
BSLM2 - Chesapeake Bay, MD 23 mi126 min N 2.9 82°F 1016 hPa64°F
APAM2 - 8575512 - Annapolis, MD 33 mi48 min 82°F 1015.6 hPa
44063 - Annapolis 35 mi36 min E 5.8 G 7.8 78°F 77°F1015.3 hPa (-1.1)
TPLM2 - Thomas Point, MD 35 mi36 min ENE 5.1 G 5.1 77°F 76°F
BLTM2 - 8574680 - Baltimore, MD 37 mi48 min N 6 G 8.9 84°F 78°F1015.6 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 37 mi48 min SE 6 G 8 78°F 1016 hPa
CPVM2 38 mi48 min 82°F 68°F
44043 - Patapsco, MD 41 mi36 min S 1.9 G 3.9 79°F 78°F1017.4 hPa (-1.1)
NCDV2 42 mi54 min NNW 5.1 G 9.9 84°F 76°F1015.6 hPa
44062 - Gooses Reef, MD 44 mi36 min NNE 3.9 G 5.8 78°F 78°F1017 hPa (-1.1)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA6 mi44 minN 610.00 miMostly Cloudy87°F64°F46%1016.8 hPa
College Park Airport, MD10 mi51 minNNW 310.00 miPartly Cloudy84°F64°F52%1016.6 hPa
Fort Belvoir, VA14 mi1.7 hrsNNE 77.00 miPartly Cloudy86°F62°F46%1016.8 hPa
Camp Springs / Andrews Air Force Base, MD14 mi98 minNNW 410.00 miPartly Cloudy84°F63°F50%1017 hPa
Gaithersburg - Montgomery County Airport, MD17 mi40 minN 010.00 miA Few Clouds83°F64°F55%1020 hPa
Washington/Dulles International Airport, DC, VA19 mi44 minN 910.00 miMostly Cloudy85°F60°F43%1017 hPa
Fort Meade / Tipton, MD21 mi51 minNNW 410.00 miPartly Cloudy82°F62°F51%1017.3 hPa

Wind History from DCA (wind in knots)
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Last 24hrNW11NW6NW8NW8NW6N6CalmS3E3CalmN4CalmNW6N7N5N6N5N6N4N4CalmN7N9N6
1 day agoN14NW14N13N14N9NW9N8N10N5N7N6NW8N9NW9NW10NW10NW8NW7NW8NW10NW10NW9NW6NW3
2 days agoNE10N9N9NE10NE9N7N9NE7NE7N9N8N9NE7N9N11N12N9N10N10N11NW11NW12NW11N14

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Thu -- 04:24 AM EDT     0.04 feet Low Tide
Thu -- 06:55 AM EDT     Sunrise
Thu -- 08:11 AM EDT     Moonrise
Thu -- 09:59 AM EDT     3.49 feet High Tide
Thu -- 04:41 PM EDT     0.04 feet Low Tide
Thu -- 07:06 PM EDT     Sunset
Thu -- 08:13 PM EDT     Moonset
Thu -- 10:20 PM EDT     3.56 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.41.710.50.10.10.81.82.73.33.53.22.61.81.20.60.20.10.51.52.53.23.53.4

Tide / Current Tables for Reagan National Airport, Washington, D.C.
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Reagan National Airport
Click for Map
Thu -- 04:12 AM EDT     0.05 feet Low Tide
Thu -- 06:55 AM EDT     Sunrise
Thu -- 08:11 AM EDT     Moonrise
Thu -- 09:47 AM EDT     3.62 feet High Tide
Thu -- 04:30 PM EDT     0.05 feet Low Tide
Thu -- 07:06 PM EDT     Sunset
Thu -- 08:13 PM EDT     Moonset
Thu -- 10:08 PM EDT     3.70 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.41.610.40.10.2122.93.53.63.22.51.81.10.60.10.10.71.72.73.43.73.5

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 (15,3,4,5)
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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.