Tuesday, June27, 2017 L-36.com


Marine Weather and Tides
Washington, DC

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 5:43AMSunset 8:39PM Tuesday June 27, 2017 1:32 PM EDT (17:32 UTC) Moonrise 8:44AMMoonset 10:34PM Illumination 14% Phase: Waxing Crescent; Moon at 4 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 Am Edt Tue Jun 27 2017
Rest of today..W winds 5 to 10 kt. Waves 1 ft. Scattered showers and tstms this afternoon.
Tonight..NW winds 5 to 10 kt. Waves 1 ft.
Wed..SW winds around 5 kt. Waves 1 ft.
Wed night..S winds 5 kt. Waves less than 1 ft.
Thu..SW winds 5 to 10 kt. Waves 1 ft.
Thu night..SW winds 10 kt. Waves 1 ft.
Fri..S winds 5 to 10 kt. Waves 1 ft.
Sat..SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1032 Am Edt Tue Jun 27 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. A weak cold front will cross the chesapeake bay region tonight. High pressure will move over the area Wednesday before shifting to bermuda through Thursday. Small craft advisory conditions are possible over portions of the waters Thursday.

7 Day Forecast for Marine Location Near Washington, DC
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location: 38.89, -77.03     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 271412 aaa
afdlwx
area forecast discussion... Updated
national weather service baltimore md washington dc
1012 am edt Tue jun 27 2017

Synopsis
A sharp upper level trough will move across the region late
today. High pressure builds over the area Wednesday before
moving offshore Thursday. Warm conditions expected towards the
end of the week and through the weekend.

Near term until 6 pm this evening
Sharp trough axis will move across the area this afternoon and
help trigger scattered showers and t-storms. Moisture and cape
are limited, but plenty of large scale forcing to overcome these
negatives. Best coverage is expected along the i-95 corridor
where low-level moisture is higher due to proximity to the
water. Gusty winds will be primary threat due to inverted-v
soundings and large amounts of downdraft cape. Convection will
shift east quickly after 21z with precip ending.

Short term 6 pm this evening through Thursday night
The surface high pressure center crosses the lwx CWA Wednesday
morning. Return southerly flow develops Wednesday afternoon with a
gradual return to summerlike conditions. Pressure gradient looks
light enough for good radiational cooling Wednesday night.

Max temps around 90f on Thursday with dewpoints rising into the 60s.

Long term Friday through Monday
High pressure will have moved well offshore by Friday. This
will allow warmth humidity to stream into the mid atlantic.

Upper level ridge will not bring the east coast especially high
heights so expect to see highs around end-of-june climo norms
of near 90.

Low pressure is expected to spin over ontario quebec this
weekend. This will allow a weak cold front trough to be in the
vicinity of the mid atlantic which could provide a focus for
shower thunderstorm activity, although by no means should the
weekend be a washout.

Looking out to the 4th of july - there are differences between
the euro and gfs. One thing seems certain is that the possibility
of it being an extremely hot day does not look to be in the
cards. Euro shows east coast "in between short waves" while gfs
has a short wave approaching the appalachians tuesay night. We
have a chance of showers thunderstorms in the forecast but we'll
continue to monitor in the coming days.

Aviation 14z Tuesday through Saturday
Vfr prevails through the week as high pressure slowly builds from
the west. Passing shower isolated thunderstorm both this morning and
later this afternoon across the dc metros ahead of a cold front.

High pressure overhead Wednesday with return southerly flow into the
weekend.

Majority of Friday Saturday should beVFR. There will be
potential for showers thunderstorms - especially Saturday, which
could drop conditions briefly belowVFR.

Marine
Considering an SCA for today or mws for later this afternoon and
tonight. Smws may be required later this afternoon.

Return southerly flow begins Wednesday night as the
high shifts to bermuda.

Winds expected to be below SCA values Friday Saturday.

Showers isolated thunderstoms will be possible on the waters
Saturday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Update... Lfr
products... Baj woody!


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 1 mi45 min NNW 8.9 G 13 77°F 81°F1015.8 hPa
44061 - Upper Potomac, MD 7 mi45 min NW 9.7 G 16 75°F 80°F1016.8 hPa
BSLM2 - Chesapeake Bay, MD 19 mi123 min NNW 5.1 75°F 1016 hPa54°F
APAM2 - 8575512 - Annapolis, MD 30 mi45 min 80°F 1015.5 hPa
44063 - Annapolis 31 mi33 min NW 12 G 18 76°F 79°F1016 hPa (-0.8)
TPLM2 - Thomas Point, MD 31 mi33 min WNW 11 G 13 75°F 78°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 35 mi45 min W 15 G 17 74°F 1015.7 hPa
FSNM2 35 mi45 min W 17 G 19 74°F 1015.9 hPa
CPVM2 35 mi45 min 78°F 50°F
BLTM2 - 8574680 - Baltimore, MD 35 mi45 min NW 8 G 14 77°F 78°F1015.7 hPa
44043 - Patapsco, MD 38 mi33 min NW 9.7 G 14 75°F 79°F1016.5 hPa (-0.8)
NCDV2 39 mi45 min SW 5.1 G 6 76°F 79°F1015.4 hPa
44062 - Gooses Reef, MD 40 mi33 min E 3.9 G 5.8 74°F 80°F1 ft1017.1 hPa (-0.5)
TCBM2 - 8573364 - Tolchester Beach, MD 47 mi45 min W 9.9 G 11 75°F 78°F1016.4 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 48 mi45 min NE 7 G 8.9 73°F 1017 hPa

Wind History for Washington, DC
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NW7
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA2 mi41 minW 7 G 1810.00 miMostly Cloudy80°F48°F34%1016.3 hPa
College Park Airport, MD9 mi41 minWNW 610.00 miMostly Cloudy75°F50°F42%1016.3 hPa
Camp Springs / Andrews Air Force Base, MD9 mi95 minNE 410.00 miA Few Clouds76°F49°F39%1017.1 hPa
Fort Belvoir, VA14 mi95 minWNW 810.00 miFair80°F48°F34%1017.2 hPa
Fort Meade / Tipton, MD20 mi60 minW 12 G 1710.00 miPartly Cloudy77°F51°F42%1017.3 hPa
Gaithersburg - Montgomery County Airport, MD21 mi37 minW 810.00 miA Few Clouds75°F54°F48%1019.3 hPa
Washington/Dulles International Airport, DC, VA23 mi41 minVar 510.00 miMostly Cloudy75°F48°F39%1016.3 hPa

Wind History from DCA (wind in knots)
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Last 24hrW9
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S9S8S11S9S11S11S8NW9
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N7N6N3N4NW8CalmN4NW10N6N8W8
G17
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1 day agoNW10NW9W4NW9W13
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NW16NW14NW9NW74NW7W6NW6NW7W8NW9NW7N7N5NW11
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2 days agoW15W13
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W10W8SW7SW5SW3W5SW3N7W5NW7N6N5CalmNW5NW7NW9N11NW6W8
G16
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G15

Tide / Current Tables for Washington, Potomac River, D.C.
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Washington
Click for Map
Tue -- 05:44 AM EDT     Sunrise
Tue -- 06:00 AM EDT     0.11 feet Low Tide
Tue -- 09:44 AM EDT     Moonrise
Tue -- 11:15 AM EDT     3.46 feet High Tide
Tue -- 06:42 PM EDT     -0.07 feet Low Tide
Tue -- 08:37 PM EDT     Sunset
Tue -- 11:34 PM EDT     Moonset
Tue -- 11:55 PM EDT     3.16 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
32.41.81.20.70.30.10.41.32.43.13.43.32.92.21.610.50.1-00.51.52.43

Tide / Current Tables for Bladensburg, Anacostia River, Maryland
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Bladensburg
Click for Map
Tue -- 05:44 AM EDT     Sunrise
Tue -- 06:25 AM EDT     0.12 feet Low Tide
Tue -- 09:44 AM EDT     Moonrise
Tue -- 11:46 AM EDT     3.67 feet High Tide
Tue -- 07:07 PM EDT     -0.08 feet Low Tide
Tue -- 08:37 PM EDT     Sunset
Tue -- 11:34 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
3.32.92.21.610.50.20.20.9233.53.73.32.721.40.80.2-0.10.21.12.12.9

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 (13,3,4,5)
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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.