Thursday, October19, 2017 L-36.com


Marine Weather and Tides
Potomac Heights, 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 7:21AMSunset 6:25PM Thursday October 19, 2017 11:25 PM EDT (03:25 UTC) Moonrise 6:00AMMoonset 5:45PM Illumination 0% Phase: New Moon; Moon at 29 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- 1031 Pm Edt Thu Oct 19 2017
Rest of tonight..W winds 5 kt. Waves less than 1 ft.
Fri..NW winds around 5 kt. Waves 1 ft.
Fri night..NW winds around 5 kt. Waves 1 ft or less.
Sat..SE winds around 5 kt. Waves 1 ft or less.
Sat night..S winds around 5 kt. Waves 1 ft.
Sun..S winds around 5 kt. Waves 1 ft.
Sun night..S winds 5 kt. Waves less than 1 ft.
Mon..S winds 5 to 10 kt. Waves 1 ft. Showers likely through the night.
Tue..W winds 5 to 10 kt. Waves 1 ft. Showers likely .
ANZ500 1031 Pm Edt Thu Oct 19 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain near the region through the weekend. A weak front will pass by to the north tonight before a stronger front approaches early next week. A small craft advisory may be needed for portions of the waters Monday through Tuesday.

7 Day Forecast for Marine Location Near Potomac Heights, MD
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location: 38.62, -77.13     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 200040
afdlwx
area forecast discussion
national weather service baltimore md washington dc
840 pm edt Thu oct 19 2017

Synopsis
High pressure will remain across the mid atlantic through this
weekend. A low pressure system will affect the region early
next week.

Near term until 6 am Friday morning
An elongated area of high pressure stretches from the deep
south northeastward across the southern appalachians and off
the mid-atlantic coastline this evening. At the same time, a
weak cold front is tracking through the ohio valley into
pennsylvania.

The weak front will push east-southeastward tonight, with its
tail end crossing the region overnight. Aside from a shift to
light northwest winds and a few added cirrus, no real sensible
weather impacts are expected with this decaying front. Although
as winds do turn to the northwest, there may be some terrain-
induced strato-cumulus along the allegheny front by morning.

Should still have decent radiational cooling tonight, but with
some added light winds and higher dewpoints, won't be as ideal
as previous nights. Lows in the 40s to near 50f for most, except
low mid 50s in the urban centers and along the shorelines of
the chesapeake and tidal potomac.

Short term 6 am Friday morning through Saturday night
High pressure will gradually build back overhead for Friday and
Saturday, providing for mostly sunny skies, relatively light
winds, and mild temperatures. There may be some patchy fog each
late night morning, but nothing widespread expected. Highs will
reach the low to mid 70s, with lows in the 40s 50s.

Long term Sunday through Thursday
High pressure system will move away from the east coast on
Sunday. A cold front approaches from the west with a wave of low
pressure tracking northeast from the gulf states towards the
mid-atlantic region Monday into Tuesday. This system will put an
end to the dry spell we've been experiencing, with
precipitation associated with it starting sometime on Monday
and remaining into Tuesday.

The pattern will evolve from warm and dry to cold and unsettled
as this system moves through, with some uncertainty on the
timing. In the upper levels, a large and deep trough will move
over the eastern CONUS Wednesday into Thursday. Guidance
suggests that this could bring some upslope showers on
Wednesday, and then dry into Thursday.

High temperatures on Monday will be between the low to mid 70s
decreasing into the 60s into Thursday.

Aviation 01z Friday through Tuesday
Patchy fog possible at mrb cho iad over the next few mornings,
but chances are low and any fog would be brief. Otherwise,VFR
through Sunday night with relatively light winds under high
pressure.

Precipitation associated with a cold frontal system is then
expected later Monday into Tuesday, which could bring sub-vfr
conditions at times.

Marine
A weak cold front will cross the waters overnight. A pressure
surge behind the boundary will cause northwest winds to increase
toward morning. While a surface inversion will limit mixing and
wind gust potential along the shores, over the open warmer
waters, gusts in excess of 20 knots are possible late tonight
into Friday morning. Therefore, will leave small craft advisory
in effect from through noon Friday. Winds will drop below sca
criteria by Friday afternoon and remain below through Sunday.

Southerly winds will increase out ahead of the next frontal
system Monday and Tuesday, and a small craft advisory may be
needed.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until noon edt Friday for anz531>534-537-
539>541-543.

Synopsis... Mm
near term... Bjl mm
short term... Mm
long term... Imr
aviation... Bjl mm imr
marine... Bjl mm imr


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 18 mi55 min SSW 1.9 G 2.9 62°F 68°F1021.2 hPa
NCDV2 21 mi55 min Calm G 1.9 56°F 66°F1020.5 hPa
BSLM2 - Chesapeake Bay, MD 25 mi115 min Calm 51°F 1021 hPa50°F
44062 - Gooses Reef, MD 38 mi45 min SW 7.8 G 9.7 66°F 1020.1 hPa
SLIM2 - 8577330 - Solomons Island, MD 41 mi55 min WSW 1.9 G 4.1 62°F 69°F1021.1 hPa
TPLM2 - Thomas Point, MD 42 mi85 min SSW 9.9 G 11 65°F 67°F
COVM2 - 8577018 - Cove Point LNG Pier, MD 42 mi55 min S 2.9 G 4.1 64°F 1022.1 hPa
44063 - Annapolis 43 mi45 min W 7.8 G 9.7 62°F 1020.2 hPa
APAM2 - 8575512 - Annapolis, MD 43 mi55 min 59°F 1020.4 hPa
PPTM2 - 8578240 - Piney Point, MD 46 mi55 min SW 7 G 8
CPVM2 47 mi55 min 66°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fort Belvoir, VA8 mi29 minN 010.00 miFair50°F48°F95%1022 hPa
Quantico Marine Corps Airfield - Turner Field, VA12 mi29 minWNW 610.00 miFair54°F53°F97%1021.9 hPa
Washington/Reagan National Airport, DC, VA17 mi33 minSSW 510.00 miA Few Clouds59°F53°F81%1021.5 hPa
Camp Springs / Andrews Air Force Base, MD20 mi29 minWSW 510.00 miFair56°F48°F76%1021.6 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA22 mi29 minSSE 310.00 miFair50°F46°F89%1023.2 hPa
Stafford, Stafford Regional Airport, VA23 mi30 minN 010.00 miFair46°F46°F100%1022.7 hPa

Wind History from DAA (wind in knots)
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Last 24hrCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS5SW3SW4CalmS5S4S3CalmCalmCalmCalmCalmCalm
1 day agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3CalmS4SE4S5S5S5S5S3CalmCalmCalmCalmCalm
2 days agoNW5N3NW4NW4--CalmCalmCalmCalm----N5N4N3CalmW3W4CalmS3CalmCalmCalmCalmCalm

Tide / Current Tables for Glymont, Potomac River, Maryland
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Glymont
Click for Map
Thu -- 01:52 AM EDT     -0.03 feet Low Tide
Thu -- 06:59 AM EDT     Moonrise
Thu -- 07:22 AM EDT     Sunrise
Thu -- 07:37 AM EDT     2.08 feet High Tide
Thu -- 02:06 PM EDT     -0.02 feet Low Tide
Thu -- 03:12 PM EDT     New Moon
Thu -- 06:24 PM EDT     Sunset
Thu -- 06:44 PM EDT     Moonset
Thu -- 07:56 PM EDT     2.19 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.1-00.20.71.31.722.11.81.30.90.50.2-00.10.61.21.72.12.221.61.2

Tide / Current Tables for Mount Vernon, Virginia
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Mount Vernon
Click for Map
Thu -- 02:25 AM EDT     -0.02 feet Low Tide
Thu -- 06:59 AM EDT     Moonrise
Thu -- 07:21 AM EDT     Sunrise
Thu -- 08:08 AM EDT     2.51 feet High Tide
Thu -- 02:39 PM EDT     0.01 feet Low Tide
Thu -- 03:12 PM EDT     New Moon
Thu -- 06:23 PM EDT     Sunset
Thu -- 06:44 PM EDT     Moonset
Thu -- 08:28 PM EDT     2.65 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.80.400.10.51.21.82.32.52.41.91.40.90.40.100.41.11.82.32.62.62.21.7

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 (23,6,7,8)
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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.