Wednesday, June28, 2017 L-36.com


Marine Weather and Tides
North Chevy Chase, 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 8:39PM Wednesday June 28, 2017 10:07 PM EDT (02:07 UTC) Moonrise 9:50AMMoonset 11:11PM Illumination 25% 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- 731 Pm Edt Wed Jun 28 2017
.small craft advisory in effect from Thursday morning through Thursday evening...
Tonight..S winds 5 kt. Waves less than 1 ft.
Thu..S winds 5 to 10 kt. Gusts up to 20 kt in the late morning and afternoon. Waves 1 ft.
Thu night..S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft.
Fri..S winds 5 to 10 kt. Waves 1 ft.
Fri night..S winds 5 to 10 kt. Waves 1 ft.
Sat..S winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Sat night..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.
Mon..NW winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 731 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. Small craft advisory conditions will be possible Friday.

7 Day Forecast for Marine Location Near North Chevy Chase, MD
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location: 39, -77.09     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 290114
afdlwx
area forecast discussion
national weather service baltimore md washington dc
914 pm edt Wed jun 28 2017

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

Near term until 6 am Thursday morning
It's a quiet night weatherwise as high pressure resides
overhead. There has been a veil of high clouds that have
overspread the region, associated with an upper-level jet
streak. These clouds have been migrating to the east along with
the responsible weather feature.

Anticipate light south flow tonight as the surface high eases
east. Therefore lows won't be as cool as the past couple of
nights, in spite of nearly clear skies, since dewpoints will be
rising. Going forecast in good shape, but will touch up a few
grids as needed.

Short term 6 am Thursday morning through Friday night
Summerlike conditions will establish over the region tomorrow
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 01z Thursday through Monday
Vfr conditions will prevail at the terminals through Friday
night. Winds will become south, possibly as high as 10 kt
sustained each afternoon. Also anticipate diurnal cumulus, with
bases around 060.

MVFR to ifr conditions are possible with showers and storms
Saturday through Sunday night.

Marine
Winds on the waters 10-15 kt sustained, with the maryland
portion of the bay on the cusp of small craft conditions.

Southerly channeling likely tonight, with the advisory already
in place.

South flow will continue through the end of the week. Guidance
suggests that 15-20 kt gusts achievable in deep mixing Thursday
and Friday afternoon. During the diurnal minimum, channeling
will focus on the main channel of the bay. SCA already posted as
appropriate Thursday-Thursday night, and likely will need to be
extended into through Friday.

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 until 6 am edt Friday for anz530>534-
537>541-543.

Small craft advisory from 10 am to 8 pm edt Thursday for
anz535-536-542.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 10 mi49 min SSE 8 G 11 76°F 81°F1020.1 hPa
44061 - Upper Potomac, MD 15 mi79 min S 9.7 G 12 73°F 80°F1020.9 hPa
BSLM2 - Chesapeake Bay, MD 25 mi157 min SE 5.1 77°F 1020 hPa61°F
APAM2 - 8575512 - Annapolis, MD 32 mi49 min 75°F 1020.1 hPa
BLTM2 - 8574680 - Baltimore, MD 33 mi49 min SSW 4.1 G 8 74°F 77°F1020 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 33 mi49 min S 9.9 G 12 74°F 1020.1 hPa
44063 - Annapolis 34 mi37 min SW 12 G 14 76°F 1020.7 hPa
FSNM2 34 mi49 min S 8 G 11 74°F 1020.3 hPa
TPLM2 - Thomas Point, MD 35 mi67 min SSW 16 G 17 76°F 77°F
CPVM2 37 mi49 min 76°F 61°F
44043 - Patapsco, MD 39 mi37 min S 14 G 16 76°F 1021 hPa
44062 - Gooses Reef, MD 47 mi37 min S 16 G 18 74°F 1022 hPa
NCDV2 47 mi49 min SSE 7 G 8 73°F 81°F1020.2 hPa
TCBM2 - 8573364 - Tolchester Beach, MD 47 mi49 min S 1.9 G 4.1 72°F 79°F1021 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
College Park Airport, MD9 mi75 minS 410.00 miFair75°F51°F44%1020.7 hPa
Washington/Reagan National Airport, DC, VA10 mi75 minSSW 1110.00 miMostly Cloudy76°F55°F48%1020.7 hPa
Gaithersburg - Montgomery County Airport, MD12 mi71 minS 410.00 miFair73°F51°F46%1023.2 hPa
Camp Springs / Andrews Air Force Base, MD17 mi69 minS 610.00 miFair72°F52°F52%1021.2 hPa
Fort Meade / Tipton, MD18 mi76 minSSE 310.00 miFair64°F57°F78%1021.3 hPa
Washington/Dulles International Airport, DC, VA19 mi75 minSSE 710.00 miPartly Cloudy72°F52°F50%1020.3 hPa
Fort Belvoir, VA19 mi69 minSSE 310.00 miFair73°F55°F55%1020.9 hPa

Wind History from CGS (wind in knots)
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Last 24hrNW5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmN4NW5W4NW3CalmW4NW7NW3CalmS4CalmS4
1 day agoCalmCalmCalmNW5CalmCalmCalmCalmCalmCalmCalmCalmW3NW4NW10W6W6W6CalmCalmNW6W6NW5N4
2 days agoCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW4W7NW7W7W4NW8NW4SW3NW6CalmCalmS3S4Calm

Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Wed -- 12:30 AM EDT     3.31 feet High Tide
Wed -- 05:45 AM EDT     Sunrise
Wed -- 07:10 AM EDT     0.14 feet Low Tide
Wed -- 10:50 AM EDT     Moonrise
Wed -- 12:45 PM EDT     3.47 feet High Tide
Wed -- 07:46 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
3.33.22.82.21.50.90.40.20.31.12.12.93.43.53.12.51.81.20.60.1-00.41.32.2

Tide / Current Tables for Chain Bridge, one mile below, Washington, D.C.
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Chain Bridge
Click for Map
Wed -- 12:25 AM EDT     3.25 feet High Tide
Wed -- 05:45 AM EDT     Sunrise
Wed -- 07:07 AM EDT     0.17 feet Low Tide
Wed -- 10:50 AM EDT     Moonrise
Wed -- 12:41 PM EDT     3.41 feet High Tide
Wed -- 07:42 PM EDT     0.00 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
3.23.22.72.11.50.90.40.20.41.12.12.93.33.432.41.81.10.60.100.51.42.3

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 (22,6,7,8)
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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.