Friday, May26, 2017 L-36.com


Marine Weather and Tides
National Harbor, MD

Version 3.4
What's New / NOTES
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 5:45AMSunset 8:25PM Friday May 26, 2017 1:27 AM EDT (05:27 UTC) Moonrise 5:47AMMoonset 8:25PM Illumination 0% Phase: New Moon; 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- 1032 Pm Edt Thu May 25 2017
.small craft advisory in effect from 6 am edt Friday through Friday afternoon...
Rest of tonight..W winds 5 kt. Waves less than 1 ft. A chance of showers late this evening, then a slight chance of showers.
Fri..SW winds 5 kt...becoming nw 10 to 15 kt in the late morning and afternoon. Gusts up to 25 kt. Waves 1 ft.
Fri night..NW winds 10 to 15 kt with gusts to 20 kt...diminishing to around 5 kt after midnight. Waves 1 ft.
Sat..S winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Sat night..E winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Sun..SE winds around 5 kt. Waves 1 ft. A chance of showers.
Sun night..S winds around 5 kt. Waves 1 ft. A chance of showers and tstms.
Mon..W winds around 5 kt. Waves 1 ft. A chance of showers. A chance of tstms.
Tue..W winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1032 Pm Edt Thu May 25 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Low pressure and its associated cold front will move through the area this evening. High pressure will build overhead Friday through Friday night before moving off the mid-atlantic coast Saturday. A warm front will stall out near the waters later Saturday and Sunday before a stronger cold front moves through Monday.

7 Day Forecast for Marine Location Near National Harbor, MD
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location: 38.8, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 260125 aaa
afdlwx
area forecast discussion... Updated
national weather service baltimore md washington dc
925 pm edt Thu may 25 2017

Synopsis
Low pressure and associated cold front will move
through the area this evening. Weak high pressure will return
to the area later Friday and Friday night before moving off the
coast Saturday. A warm front will stall out overhead later
Saturday through Sunday. A stronger cold front will pass through
the area Monday.

Near term until 7 am Friday morning
Cutoff low that produced the widespread showers thunderstorms
this afternoon evening now pushing eastward, and
coverage intensity of the activity will continue to decline
during the remainder of the evening. Will see westerly flow
increase behind the departing system, so some upslope rain
showers likely overnight into Friday morning. Otherwise, for the
rest of the area, drying conditions likely, with even some
breaks in the clouds developing. There may also be some patchy
fog develop in areas that can decouple. Temperatures not going
to fall much more, generally holding or falling slightly into
the 50s.

Short term 7 am Friday morning through Saturday night
Low pressure will continue to move away from the area Friday
while high pressure approaches from the west. A west to
northwest flow will usher in seasonable conditions... But it will
be breeze due to a tight gradient between the departing low and
building high. An isolated shower cannot be ruled out from
daytime heating... But much of the time will be dry.

Weak high pressure will build overhead Friday night before
moving off off the coast Saturday. A warm front will stall out
over the area later Saturday through Saturday night. Marine air
will allow for cooler conditions across northeastern portions of
the CWA while much warmer and more humid conditions are expected
across central and western areas behind the boundary. There is
still some uncertainty as to exactly where the boundary will
setup. However... With warm and humid conditions in place showers
and thunderstorms will likely develop. Sufficient shear suggests
that some storms could be severe... Mainly along and south west
of the boundary. Convection should dissipate in coverage later
Saturday night due to the loss of daytime heating.

Long term Sunday through Thursday
A warm front will settle near over our CWA Sunday
before a cold front moves across late Sunday night into Monday
morning. Showers and thunderstorms possible with periods of
heavy rain during these days. Conditions start to dry out into
Tuesday as westerly flow settles in. Another -weaker- front
approaches on Tuesday night into Wednesday, increasing pops
slightly. Several pieces of upper level energy could bring a
chance of precip to our area Wednesday into Thursday, but
looking into mostly dry conditions.

High temperatures will be in the 70s and 80s... Some 60s at
higher elevations.

Aviation 02z Friday through Tuesday
Showers and thunderstorms and their associated sub-vfr
conditions and gusty winds are weakening and decreasing in
coverage. This will lead to the return of primarilyVFR
conditions overnight. There may be some patchy fog around, but
have kept out of the tafs for now given increasing low level
wind field.

Vfr conditions are expected most of the time Friday through
Saturday night. West to northwest winds will gust around 20 to
25 knots Friday. A few showers and thunderstorms are possible
Saturday. Some storms may become strong to severe during the
afternoon and evening hours.

Sub-vfr conditions expected Sunday into Monday with
rounds of showers and thunderstorms moving through our region
with a boundaries stalled moving through. Conditions become
drierVFR Monday night into Tuesday.

Marine
Showers thunderstorms will decrease in coverage through the
evening. A small craft advisory is in effect for most of the
waters tonight as westerly flow increases behind departing
system. Gusts up to around 20 knots expected overnight.

A small craft advisory is in effect for all of the waters Friday
due to gusty west to northwest winds expected behind departing
low pressure. Winds will quickly diminish toward sunset. Weak
high pressure will build overhead Friday night before moving
offshore Saturday. A warm front will stall out near the waters
later Saturday through Saturday night. Additional showers and
thunderstorms are possible during this time... Especially
Saturday afternoon and evening.

Tides coastal flooding
Combination of high astronomical tides due to a new moon and
onshore flow will result in minor coastal flooding near times of
high tide through tonight for most areas into Friday morning.

Coastal flood headlines are in effect during this time.

Tidal anomalies should decrease rapidly later Friday due to
strengthening west to northwest flow.

Lwx watches warnings advisories
Dc... Coastal flood advisory until 11 am edt Friday for dcz001.

Md... Coastal flood advisory until 10 am edt Friday for mdz014-018.

Coastal flood advisory from 4 am to 10 am edt Friday for
mdz011.

Coastal flood advisory until 6 am edt Friday for mdz017.

Va... Coastal flood advisory until 11 am edt Friday for vaz054.

Wv... None.

Marine... Small craft advisory until 6 pm edt Friday for anz530>534-
536>543.

Small craft advisory from 6 am to 6 pm edt Friday for anz535.

Synopsis... Bjl
near term... Bjl mm
short term... Bjl
long term... Imr
aviation... Bjl mm imr
marine... Bjl mm imr
tides coastal flooding...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44061 - Upper Potomac, MD 1 mi40 min SSW 5.8 G 5.8 57°F 67°F1001.3 hPa
WASD2 - 8594900 - Washington, DC 5 mi40 min W 2.9 G 5.1 60°F 69°F1000.7 hPa
BSLM2 - Chesapeake Bay, MD 17 mi118 min W 2.9 55°F 1000 hPa55°F
TPLM2 - Thomas Point, MD 32 mi28 min W 13 G 14 60°F 65°F
APAM2 - 8575512 - Annapolis, MD 32 mi40 min 60°F 1000 hPa
NCDV2 33 mi40 min WSW 6 G 9.9 60°F 67°F1000.8 hPa
44063 - Annapolis 33 mi28 min W 9.7 G 14 60°F 65°F1000.3 hPa (+1.8)
44062 - Gooses Reef, MD 37 mi28 min WNW 12 G 14 61°F 62°F1 ft1001.9 hPa (+2.6)
CPVM2 37 mi40 min 61°F 61°F
FSNM2 39 mi40 min W 12 G 15 60°F 999.7 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 39 mi40 min W 9.9 G 12 61°F 999.9 hPa
BLTM2 - 8574680 - Baltimore, MD 40 mi40 min NW 4.1 G 8 61°F 69°F999.6 hPa
44043 - Patapsco, MD 42 mi28 min W 14 G 16 61°F 65°F1 ft1000.5 hPa (+1.4)
COVM2 - 8577018 - Cove Point LNG Pier, MD 44 mi40 min WNW 8 G 12 60°F 1001.8 hPa
SLIM2 - 8577330 - Solomons Island, MD 45 mi40 min W 5.1 G 7 61°F 67°F

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA4 mi36 minSW 610.00 miA Few Clouds60°F59°F96%1001.4 hPa
Camp Springs / Andrews Air Force Base, MD9 mi30 minWSW 410.00 miFair58°F56°F97%1001.6 hPa
Fort Belvoir, VA9 mi30 minW 310.00 miFair58°F55°F92%1002 hPa
College Park Airport, MD14 mi55 minN 010.00 miMostly Cloudy58°F56°F94%1000.7 hPa
Fort Meade / Tipton, MD24 mi37 minWSW 34.00 miMostly Cloudy55°F55°F100%1001.4 hPa

Wind History from DCA (wind in knots)
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Last 24hrE13E7
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E14E10E9NE5NE7N8NW6W5SW10SW8S9S8S8SW7S22
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NW11W10SE6SW6SW3SW4SW6
1 day agoN10NE6NE7NE7NE9NE7CalmNE7NE6NE4SE5E8E10SE11SE8SE11SE10SE11SE9E10
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2 days agoCalmNW6N8N7N5N9NE7NE10N6E7E6E10E5E4E5E9SE7E6E8NE4NE5N4N5N6

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Fri -- 03:14 AM EDT     0.11 feet Low Tide
Fri -- 05:47 AM EDT     Sunrise
Fri -- 06:47 AM EDT     Moonrise
Fri -- 09:00 AM EDT     3.83 feet High Tide
Fri -- 04:11 PM EDT     -0.10 feet Low Tide
Fri -- 08:23 PM EDT     Sunset
Fri -- 09:24 PM EDT     Moonset
Fri -- 09:41 PM EDT     3.24 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.40.80.40.10.20.81.92.93.63.83.62.92.11.40.80.2-0.10.10.81.82.73.13.22.8

Tide / Current Tables for Riverview, Potomac River, Maryland
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Riverview
Click for Map
Fri -- 02:59 AM EDT     0.13 feet Low Tide
Fri -- 05:47 AM EDT     Sunrise
Fri -- 06:47 AM EDT     Moonrise
Fri -- 08:44 AM EDT     3.48 feet High Tide
Fri -- 03:58 PM EDT     -0.06 feet Low Tide
Fri -- 08:22 PM EDT     Sunset
Fri -- 09:24 PM EDT     Moonset
Fri -- 09:25 PM EDT     2.92 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.20.60.30.10.3122.93.43.53.12.41.81.10.60.2-0.10.211.92.62.92.82.4

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 (1,6,7,8)
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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.