Wednesday, June28, 2017 L-36.com


Marine Weather and Tides
National Harbor, 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 5:44AMSunset 8:38PM Wednesday June 28, 2017 6:50 PM EDT (22:50 UTC) Moonrise 9:50AMMoonset 11:11PM Illumination 24% Phase: Waxing Crescent; Moon at 5 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- 432 Pm Edt Wed Jun 28 2017
.small craft advisory in effect from Thursday morning through Thursday evening...
Rest of this afternoon..SW winds 5 kt. Waves less than 1 ft.
Tonight..S winds 5 to 10 kt. Waves 1 ft.
Thu..S winds 10 to 15 kt. Gusts up to 20 kt in the late morning and afternoon. Waves 1 ft.
Thu night..S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Fri..SW winds 5 to 10 kt. Waves 1 ft.
Fri night..S winds 5 to 10 kt. Waves 1 ft.
Sat..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Sun..NW winds around 5 kt. Waves 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 432 Pm Edt Wed Jun 28 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will move toward bermuda. South flow will become established through the weekend.

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 281824
afdlwx
area forecast discussion
national weather service baltimore md washington dc
224 pm edt Wed jun 28 2017

Synopsis High pressure will settle near bermuda on Thursday
with hot and humid conditions returning and persisting through
the first half of next week.

Near term through tonight Quiet weather tonight as high
pressure shifts offshore. Warmer tonight due to light srly flow
and veil of high thin clouds mainly across the north.

Short term Thursday through Friday night Summerlike
conditions will establish over the region tomorrow and persist
through the first half of next week and likely beyond with
bermuda surface high pressure and subtropical ridge to the
south. As a result, expect temperatures to climb into the low
90s on Thu and mid 90s on fri. By Friday, there is enough
instability to t-storms over the mtns.

Long term Saturday through Wednesday
High pressure will move offshore the east coast to usher in warmer
air and increasing humidity Saturday through Sunday night. There is
a chance for showers and thunderstorms each period with the better
chances during the afternoon and early evening both Saturday and
Sunday.

A second area of high pressure will build into the region Monday and
Monday night, bringing less humid conditions.

The shower and thunderstorm chances return on the 4th of july as an
inverted trough of low pressure sets up over the region.

Temperatures will not be as warm as previous days.

By Wednesday, small pieces of energy arrive and move across the
region. The chance for a couple of showers linger.

Aviation 18z Wednesday through Monday Vfr conditions
through Fri night.

MVFR to ifr conditions are possible with showers and storms Saturday
through Sunday night. Winds southwest 5 to 10 knots Saturday
through Sunday night.

Marine Winds will strengthen tonight and remain gusty through
fri night with SCA conditions expected.

No marine hazards expected Saturday through Sunday night. Winds
southwest around 10 knots.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory from 9 pm this evening to 4 am edt
Thursday for anz531>534-537-539>541-543.

Synopsis... Lfr
near term... Lfr
short term... Lfr
long term... Klw
aviation... Lfr klw
marine... Lfr klw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44061 - Upper Potomac, MD 1 mi62 min S 12 G 14 76°F 80°F1020.7 hPa
WASD2 - 8594900 - Washington, DC 5 mi50 min S 7 G 9.9 79°F 80°F1019.9 hPa (-1.0)
BSLM2 - Chesapeake Bay, MD 17 mi140 min NW 2.9 80°F 1021 hPa48°F
TPLM2 - Thomas Point, MD 32 mi50 min S 13 G 14 75°F 78°F
APAM2 - 8575512 - Annapolis, MD 32 mi50 min 78°F 1020.4 hPa (-0.6)
NCDV2 33 mi50 min SE 6 G 8.9 77°F 80°F1020.2 hPa (-0.8)
44063 - Annapolis 33 mi40 min SSW 12 G 16 76°F 1 ft1021 hPa
44062 - Gooses Reef, MD 37 mi40 min SSE 12 G 16 76°F 1 ft1022 hPa
CPVM2 37 mi50 min 77°F 56°F
FSNM2 39 mi50 min SSE 11 G 14 76°F 1020.3 hPa (-0.8)
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 39 mi50 min SE 9.9 G 13 76°F 1020.1 hPa (-0.9)
BLTM2 - 8574680 - Baltimore, MD 40 mi50 min S 9.9 G 12 77°F 78°F1019.9 hPa (-0.8)
44043 - Patapsco, MD 42 mi40 min S 12 G 14 76°F 1 ft1021.2 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 44 mi50 min S 9.9 G 11 74°F 1021.9 hPa (-0.8)
SLIM2 - 8577330 - Solomons Island, MD 45 mi50 min SW 6 G 8 78°F 79°F

Wind History for Washington, DC
(wind in knots)    EDIT      (on/off)   Help
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NW8
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G11
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NW10
G15
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G12
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G16
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G14
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA4 mi58 minS 6 G 1710.00 miMostly Cloudy81°F51°F35%1020.6 hPa
Camp Springs / Andrews Air Force Base, MD9 mi1.9 hrsN 010.00 miFair80°F46°F31%1021.2 hPa
Fort Belvoir, VA9 mi1.9 hrsSSW 810.00 miMostly Cloudy81°F49°F33%1021.3 hPa
College Park Airport, MD14 mi58 minN 010.00 miFair80°F45°F30%1020.3 hPa
Fort Meade / Tipton, MD24 mi59 minN 010.00 miFair75°F50°F41%1021.3 hPa

Wind History from DCA (wind in knots)
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Last 24hrNW10NW11NW13N13N9NW7NW6CalmNW4NW3NW4SW3W4W4SE3E36N10NE8N74SW8W4S6
G17
1 day agoS8S11S9S11S11S8NW9
G15
N7N6N3N4NW8CalmN4NW10N6N8W8
G17
W7
G18
W10W9N11E5W6
2 days agoNW16NW14NW9NW74NW7W6NW6NW7W8NW9NW7N7N5NW11
G15
6
G21
W11
G19
NW9--W9
G14
4W12W10
G15
S9

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Wed -- 12:03 AM EDT     3.21 feet High Tide
Wed -- 05:45 AM EDT     Sunrise
Wed -- 06:37 AM EDT     0.14 feet Low Tide
Wed -- 10:50 AM EDT     Moonrise
Wed -- 12:18 PM EDT     3.37 feet High Tide
Wed -- 07:13 PM EDT     -0.02 feet Low Tide
Wed -- 08:37 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.232.41.81.20.60.20.20.61.52.43.13.33.32.82.11.40.80.3-00.10.81.72.5

Tide / Current Tables for Riverview, Potomac River, Maryland
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Riverview
Click for Map
Wed -- 05:45 AM EDT     Sunrise
Wed -- 06:24 AM EDT     0.15 feet Low Tide
Wed -- 10:50 AM EDT     Moonrise
Wed -- 12:04 PM EDT     3.05 feet High Tide
Wed -- 06:59 PM EDT     0.00 feet Low Tide
Wed -- 08:36 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.92.62.11.50.90.50.20.20.81.62.42.932.92.41.81.20.70.200.311.82.4

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 (18,4,5,8)
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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.