Wednesday, October18, 2017 L-36.com


Marine Weather and Tides
Alexandria, VA

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 7:20AMSunset 6:25PM Wednesday October 18, 2017 12:54 PM EDT (16:54 UTC) Moonrise 4:59AMMoonset 5:13PM 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- 1031 Am Edt Wed Oct 18 2017
Rest of today..S winds 5 kt. Waves less than 1 ft.
Tonight..S winds around 5 kt. Waves 1 ft.
Thu..SW winds around 5 kt. Waves 1 ft.
Thu night..W winds around 5 kt. Waves 1 ft.
Fri..NW winds 5 kt. Waves less than 1 ft.
Fri night..N winds around 5 kt. Waves 1 ft or less.
Sat..S winds around 5 kt. Waves 1 ft or less.
Sun..S winds around 5 kt. Waves 1 ft.
ANZ500 1031 Am Edt Wed Oct 18 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will remain near the region for the rest of the week and into the weekend. A weak front will pass by to the north Thursday night. Small craft advisories may be needed Thursday night into Friday morning.

7 Day Forecast for Marine Location Near Alexandria, VA
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location: 38.83, -77.04     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 181330
afdlwx
area forecast discussion
national weather service baltimore md washington dc
930 am edt Wed oct 18 2017

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

Near term through tonight
High pressure is located directly over the region this morning,
and will slowly drift southeastward through the day. This will
lead to the development of a light south wind by the afternoon.

Otherwise sunny skies expected with high temperatures peaking a
few degrees on either side of 70 degrees.

An upper level trough will cross the area tonight, although it
will have little impact other than some additional cirrus. Dew
points will be a little higher, and some locations may be able
to hold onto a light south wind since the high will be to the
southeast. Thus expect any frost to be much more isolated, with
most locations in the upper 30s to mid 40s... And lower 50s in
the cities.

Short term Thursday through Friday night
The center of the high will remain generally to our south and
southwest Thursday into Thursday night. The tail end of a
decaying cold front low level trough over new england will clip
the area Thursday night, but bring little more than a few clouds
and a wind shift to the northwest. The upper level pattern will
amplify (west coast trough east coast ridge) Friday into Friday
night, with the surface high expanding back to the north and
east.

High temperatures will continue to warm through the 70s.

Overnight lows will be in the 40s for most, with 50s in the
cities. Greater variation is likely Friday night though with a
more favorable radiational cooling set up.

Long term Saturday through Tuesday
High pressure will be centered overhead or just to the northeast
on Saturday morning, providing light winds and mostly clear
skies. After a cool (but not as chilly as this morning) start,
it will warm into the 70s with plenty of sun. The high will
shift eastward off the coast by Sunday, with more of a
southerly flow - however, the gradient will remain weak, so not
a whole lot of change in sensible weather. A little warmer, a
few more high clouds, that's likely all the difference between
Saturday and Sunday. Overall, ideal weekend weather,
particularly for autumn.

Guidance still shows a cold front and wave of low pressure
moving toward the region early next week, but are a bit less in
sync than last night. The GFS is significantly slower than the
ec in bringing the upper low and its associated surface wave
northeastward into the region, causing Monday to be drier on the
gfs than on the ec, with a faster drying trend as we head into
the middle of the week on the ec than on the gfs. Overall, will
keep chance of showers, and heavy rain remains possible, given
strong wave and potential for training along the stalling front.

Both models also still show a very deep trough digging over the
eastern us behind the system for mid-late week next week. This
is something that would likely end the growing season across
much of the region, while also perhaps trying to get a few snow
flakes flying, especially in our higher terrain. Still, there's
a long time to watch this.

Aviation 14z Wednesday through Sunday
High pressure will remain in control through the end of the
weekend. PredominantlyVFR expected, but can't rule out a brief
period of fog br at mrb cho the next few mornings. Otherwise
only passing cirrus is expected with winds less than 10 kt.

Marine
High pressure will remain nearby through Thursday with light
southerly winds developing. A weak front will pass by to the
north Thursday night, which will turn winds to the northwest.

Potential for small craft advisory conditions will be dependent
on mixing, so the greater chance would be over the more open
waters. Winds will subside during the day on Friday as high
pressure moves back overhead, which will then generally persist
through the weekend.

Tides coastal flooding
Anomalies have risen to around one-half to three quarters of a
foot above normal. This should keep water levels below minor
flood thresholds but it will be close for the sensitive sites of
straits point, annapolis, and washington dc. Water levels will
need to be monitored.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Rcm
near term... Ads mm
short term... Ads
long term... Rcm
aviation... Ads mm rcm
marine... Ads mm rcm
tides coastal flooding... Ads


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 3 mi54 min SSE 2.9 G 4.1 62°F 68°F1029.3 hPa (+0.0)
BSLM2 - Chesapeake Bay, MD 18 mi144 min Calm 48°F 1029 hPa
APAM2 - 8575512 - Annapolis, MD 32 mi54 min 62°F 1028.5 hPa (+0.0)
TPLM2 - Thomas Point, MD 32 mi54 min SSW 4.1 G 5.1 60°F 68°F
44063 - Annapolis 33 mi44 min SSE 3.9 G 3.9 61°F 1028.1 hPa
NCDV2 35 mi54 min ESE 1.9 G 5.1 61°F 65°F1028.7 hPa (+0.0)
CPVM2 36 mi54 min 62°F 46°F
44062 - Gooses Reef, MD 38 mi44 min WNW 3.9 G 5.8 62°F 1 ft1035.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 38 mi54 min ESE 1.9 G 2.9 61°F 1028.8 hPa (+0.0)
BLTM2 - 8574680 - Baltimore, MD 39 mi54 min SW 2.9 G 5.1 64°F 70°F1028.3 hPa (+0.0)
44043 - Patapsco, MD 41 mi44 min SSE 3.9 G 3.9 60°F 1030 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 46 mi54 min WSW 1 G 4.1 65°F 1030.1 hPa (+0.3)
SLIM2 - 8577330 - Solomons Island, MD 47 mi54 min S 1.9 G 4.1 62°F 70°F1029.1 hPa (+0.0)

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi62 minS 610.00 miFair63°F46°F54%1029.6 hPa
Camp Springs / Andrews Air Force Base, MD9 mi56 minN 09.00 miFair65°F42°F44%1029.8 hPa
Fort Belvoir, VA10 mi58 minS 410.00 miFair65°F43°F47%1029.8 hPa
College Park Airport, MD12 mi69 minN 010.00 miFair64°F41°F44%1029.1 hPa
Fort Meade / Tipton, MD23 mi69 minS 310.00 miFair63°F44°F52%1029.8 hPa
Washington/Dulles International Airport, DC, VA24 mi62 minN 010.00 miFair65°F42°F43%1029.4 hPa
Gaithersburg - Montgomery County Airport, MD24 mi58 minVar 410.00 miFair65°F43°F45%1032.7 hPa

Wind History from DCA (wind in knots)
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Last 24hrN8NE4CalmNE4CalmS3SW6S6SE6SE5SW4SW5SW5CalmCalmSW3SW3SW3SW3CalmSW4SE4SE4S6
1 day agoNW15
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NW15NW17
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NW11NW8N9NW12NW10NW12NW9NW6N8N8N11N6N6N8NE8NE9NE126
2 days agoS10S12
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NW9N6NW5NW10
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NW5NW9N10NW11NW14
G22

Tide / Current Tables for Bellevue, Potomac River, Washington, D.C.
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Bellevue
Click for Map
Wed -- 02:11 AM EDT     -0.03 feet Low Tide
Wed -- 05:59 AM EDT     Moonrise
Wed -- 07:20 AM EDT     Sunrise
Wed -- 07:53 AM EDT     3.32 feet High Tide
Wed -- 02:32 PM EDT     -0.04 feet Low Tide
Wed -- 06:12 PM EDT     Moonset
Wed -- 06:25 PM EDT     Sunset
Wed -- 08:16 PM EDT     3.44 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.90.4-00.20.91.82.63.13.332.41.71.10.5000.61.52.43.13.43.32.82.1

Tide / Current Tables for Benning Bridge, D.C.
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Benning Bridge
Click for Map
Wed -- 02:27 AM EDT     0.01 feet Low Tide
Wed -- 05:58 AM EDT     Moonrise
Wed -- 07:20 AM EDT     Sunrise
Wed -- 08:09 AM EDT     3.41 feet High Tide
Wed -- 02:47 PM EDT     -0.00 feet Low Tide
Wed -- 06:12 PM EDT     Moonset
Wed -- 06:24 PM EDT     Sunset
Wed -- 08:32 PM EDT     3.55 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.60.10.10.71.62.53.13.43.22.721.30.70.200.41.32.333.53.532.4

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 (12,3,4,5)
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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.