Monday, March18, 2019 L-36.com


Marine Weather and Tides
Williamsport, MD

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 7:16AMSunset 7:21PM Monday March 18, 2019 10:20 PM EDT (02:20 UTC) Moonrise 3:36PMMoonset 4:59AM Illumination 96% Phase: Waxing Gibbous; Moon at 13 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- 739 Pm Edt Mon Mar 18 2019
Tonight..W winds 5 kt. Waves less than 1 ft. Scattered showers this evening.
Tue..NW winds 5 kt. Waves less than 1 ft.
Tue night..S winds around 5 kt. Waves 1 ft or less.
Wed..S winds around 5 kt. Waves 1 ft.
Wed night..S winds 5 kt. Waves less than 1 ft. A chance of showers.
Thu..W winds around 5 kt. Waves 1 ft. Showers likely.
Thu night..NW winds 5 kt. Waves less than 1 ft.
Fri..NW winds 5 to 10 kt. Waves 1 ft.
Sat..NW winds 5 to 10 kt. Waves 1 ft.
ANZ500 739 Pm Edt Mon Mar 18 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will return for tonight through Wednesday. Low pressure will move northward along the coast Wednesday night, followed by a cold frontal passage Thursday. High pressure will return for late in the week into the weekend. A small craft advisory may be needed for portions of the waters later Wednesday through Friday.


7 Day Forecast for Marine Location Near Williamsport, MD
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location: 39.58, -77.81     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 190053
afdlwx
area forecast discussion
national weather service baltimore md washington dc
853 pm edt Mon mar 18 2019

Synopsis
High pressure will build tonight through Wednesday. Low
pressure will move northward along the atlantic coast Wednesday
night. A cold front will pass through the area Thursday and high
pressure will return for Friday into the weekend.

Near term through Tuesday
Latest surface analysis shows high pressure centered over the
ohio valley, with low pressure well to our south over the
western atlantic. Aloft, a shortwave is crossing the region at
present.

The high pressure will move directly across the region during
the rest of tonight into Tuesday as the upper level trough
slowly lifts out, resulting in dry weather with clearing skies.

The chilly canadian air mass and light winds will allow temps
to drop below freezing in most surburbs, and possibly even in
the urban areas and along the tidal waters. Chilly conditions
will continue Tuesday despite sunshine, with highs struggling to
reach the 50s. This will be a few degrees below normal for this
time of year, though the deviation isn't all that great.

Short term Tuesday night through Thursday
High pressure shifts eastward into the atlantic Tuesday night
and Wednesday but will remain in overall control. Temperatures
should moderate a bit but we're not expecting a big warm up from
Tuesday to Wednesday... Just closer to normal, really. Skies
will generally remain clear to partly cloudy.

Things get more interesting Wednesday night as a trough digging
to the west induces cyclogenesis along the carolina coast, which
then rockets northeastward. This trough looks pretty potent,
with some phasing potential, but the question for our region is
just how far west will the low pressure's influence make it.

Latest guidance has trended westward with the low track and the
precip, so have generally increased pops across our region,
especially eastern areas, for Wednesday night into Thursday. It
must be noted that temps may remain a bit marginal Wednesday
night, and a few models with the more westerly track are hinting
that a little snow may mix with the rain north and west of the
i-95 corridor. For now have confined snow to the high mountains,
but this will need to be watched closely if the trend
continues.

The coastal low rockets northeastward during the day Thursday,
but a cold front will be approaching from the northwest. This
means there may not be much of a gap between the rain with the
coastal low (should that rain make it into our region) and
showers associated with the cold front. However, southerly flow
ahead of the front, plus insolation, should allow temps to rise
noticeably, resulting in mostly rain showers during daylight
hours.

Long term Thursday night through Monday
On Thursday night a cold front cross the region. Behind the
frontal passage, high pressure will build into our region from
the upper midwest and linger through Sunday. A few upslope
showers Friday morning can't be ruled out in eastern west
virginia and western maryland. Winds will become northwest to
westerly leading to temperatures remaining mild for this time of
the year. By the end of this weekend, temperatures are expected
to trend back upwards as high as the 70 degree mark.

Aviation 01z Tuesday through Saturday
Vfr conditions prevail thru Wednesday as high pressure crosses
the region. Winds generally below 15 knots.

Coastal low pressure moving up the coast may spread rain and
sub-vfr conditions westward into the eastern terminals Wednesday
night into early Thursday. Then, a cold front will cross the
region later Thursday Thursday evening, with potential for more
brief sub-vfr conditions in showers.

High pressure will build into our region on Friday with
winds mainly out of the west. Clouds will slowly dissipate on
Friday with some higher clouds lingering over our region.VFR
conditions expected at this time.

Marine
Sub-sca conditions expected through Wednesday. Wednesday night
into early Thursday, a coastal low pressure moving northward up
the coast may bring SCA winds to the waters. Later Thursday into
Thursday night, a cold front may do likewise.

Friday, winds will become westerly ith strong winds aloft
hovering near or above 18 knots which suggests small craft
advisories may be needed.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Imr rcm
near term... Rcm
short term... Rcm
long term... Jmg
aviation... Rcm jmg
marine... Rcm jmg


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 64 mi33 min SSE 4.1 G 7 44°F 50°F1028.2 hPa
BLTM2 - 8574680 - Baltimore, MD 69 mi39 min W 2.9 G 4.1 43°F 45°F1027.3 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 72 mi39 min W 6 G 7 42°F 1027.7 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hagerstown, Washington County Regional Airport, MD10 mi28 minNW 610.00 miFair38°F15°F39%1029.4 hPa
Eastern WV Regional Airport/Shepherd Field, WV15 mi28 minNNW 610.00 miFair39°F15°F38%1028.2 hPa

Wind History from HGR (wind in knots)
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Last 24hrCalmSE4SE3CalmNE4N5NE5NW3NE5NE6N4E7CalmCalmW54NW6N5NW14NW9NW10NW8NW7NW6
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Tide / Current Tables for Chain Bridge, D.C.
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Chain Bridge
Click for Map
Mon -- 01:26 AM EDT     0.14 feet Low Tide
Mon -- 05:54 AM EDT     Moonset
Mon -- 06:57 AM EDT     3.00 feet High Tide
Mon -- 07:15 AM EDT     Sunrise
Mon -- 01:39 PM EDT     0.06 feet Low Tide
Mon -- 04:34 PM EDT     Moonrise
Mon -- 07:18 PM EDT     Sunset
Mon -- 07:20 PM EDT     3.24 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.50.20.20.71.62.42.832.82.21.50.90.50.10.10.51.32.32.93.23.12.721.4

Tide / Current Tables for Chain Bridge, one mile below, D.C.
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Chain Bridge
Click for Map
Mon -- 01:21 AM EDT     0.14 feet Low Tide
Mon -- 05:54 AM EDT     Moonset
Mon -- 06:52 AM EDT     3.00 feet High Tide
Mon -- 07:15 AM EDT     Sunrise
Mon -- 01:34 PM EDT     0.06 feet Low Tide
Mon -- 04:34 PM EDT     Moonrise
Mon -- 07:15 PM EDT     3.24 feet High Tide
Mon -- 07:18 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.40.20.20.81.62.42.932.72.11.50.90.40.10.10.51.42.333.23.12.621.3

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (22,6,7,8)
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Ground Weather Radar Station Sterling, VA
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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.