Tuesday, November21, 2017 L-36.com

Marine Weather and Tides
Arnold, 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 6:55AMSunset 4:49PM Tuesday November 21, 2017 6:55 AM EST (11:55 UTC) Moonrise 9:27AMMoonset 7:28PM Illumination 8% Phase: Waxing Crescent; Moon at 3 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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ANZ538 Patapsco River Including Baltimore Harbor- 631 Am Est Tue Nov 21 2017
.small craft advisory in effect until 6 pm est this evening...
.small craft advisory in effect from Wednesday morning through Wednesday afternoon...
Today..S winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Tonight..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers.
Wed..NW winds 10 to 15 kt. Gusts up to 20 kt. Waves 1 ft.
Wed night..N winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft.
Thu..W winds 5 kt. Waves flat.
Thu night..W winds 5 kt. Waves flat.
Fri..SW winds 5 kt. Waves less than 1 ft.
Sat..W winds 5 to 10 kt. Waves 1 ft.
ANZ500 631 Am Est Tue Nov 21 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will move offshore through this afternoon. A cold front will pass through late tonight into early Wednesday morning. High pressure will return later Wednesday through early Friday, then another cold front will approach late Friday into Saturday. A small craft advisory will likely be needed for portions of the waters Wednesday night, and again Friday night through Saturday.

7 Day Forecast for Marine Location Near Arnold, MD
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location: 39.03, -76.53     debug

Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 210810
area forecast discussion
national weather service baltimore md washington dc
310 am est Tue nov 21 2017

High pressure will move offshore today and a cold front will
pass through tonight into early Wednesday. High pressure will
build back overhead later Wednesday through thanksgiving day.

The high will build to our south for Friday and Saturday before
a cold front moves through Saturday night. Canadian high
pressure will build overhead early next week.

Near term through tonight
High pressure to our south early this morning will move offshore
later today. A southwest flow around the high will usher in
milder conditions after a chilly start early this morning. Max
temps will range from the upper 40s and lower 50s in the
mountains to the upper 50s and lower 60s across most other
locations. There will be a thin deck of high clouds due to a
southwest flow aloft... But the cloud deck should be thin enough
for a partly to mostly sunny sky.

A cold front over the ohio valley this evening will move into
the area late tonight. A southerly flow ahead of the boundary
will cause clouds to increase early this evening and a few
showers are possible with the frontal passage later this evening
into the overnight hours. Moisture will be limited and forcing
will be weak with most of the dynamics off to the north.

Therefore... Any showers that do occur will be light. The best
chance for showers will be across eastern areas where moisture
will have a little more time to advect in from the south before
the frontal passage. Min temps will range from the upper 20s to
around 30 in the allegheny highlands to the mid and upper 40s
in downtown washington and baltimore into southern maryland.

A period of upslope snow showers are expected late tonight
behind the cold front for locations along west of the allegheny
highlands. Accumulations should be around one inch or less since
moisture will be limited... But this may cause slippery
conditions by the early morning hours Wednesday.

Short term Wednesday through Thursday night
The cold front will move off to the south and east early
Wednesday morning. Canadian high pressure will approach from the
north and west and a northwest flow ahead of the high will usher
in drier and chillier conditions. MAX temps will hold in the 40s
for most locations north and west of interstate 95 and in the
lower to middle 50s farther south and east.

High pressure will build overhead Wednesday night... Bringing dry
and cold conditions. Min temps will drop into the 20s for most
areas. High pressure will remain overhead thanksgiving day
through thanksgiving night... Bringing more dry and chilly

Long term Friday through Monday
High pressure will be in control of the region's weather on
Friday leading to fair skies and dry weather.

By Friday night, a potent northern stream system and its
associated cold fronts will move into the upper midwest,
before barrelling towards the mid-atlantic states Saturday and
Saturday night. The series of cold fronts will cross the region
during this time period with chances of some showers. Southern
stream energy will be present as well near the southeastern
states but at this time, the fast flow aloft and orientation of
the upper level trough suggests that any surface low that can
develop will favor a track well offshore with little to no
impact to the region.

On Sunday, behind the fronts and with the upper trough moving
overhead, blustery and colder conditions are likely, along with
the potential for snow showers over the higher terrain. As the
upper trough does move overhead, some scattered flurries snow
showers are even possible in lower terrain.

High pressure will build back overhead by Monday with
fair skies and diminishing winds.

Temperatures will start out near normal or even a bit above for
Friday and Saturday (50s), before falling back below for Sunday
and Monday (40s).

Aviation 08z Tuesday through Saturday
Southwest winds will gust around 20 knots late this morning and
afternoon. A cold front will pass through the terminals tonight.

A few showers cannot be ruled out... But any precipitation
amounts will be light. Brief MVFR conditions are possible in any
showers that do occur... ButVFR conditions are most likely for
most of the time. Northwest winds will develop behind the cold
front early Wednesday morning and gusts around 20 to 25 knots
are expected for most of Wednesday behind the cold front.

High pressure will settle overhead for Thursday through Thursday
night withVFR conditions likely.

Vfr and light winds expected Friday with surface high pressure.

Chances for some showers exist on Saturday with a frontal
system, but widespread restrictions are not currently expected.

A southwest flow will increase today ahead of a cold front. A
small craft advisory is in effect for the waters. The sca
continues through this evening for most of the bay and lower
tidal potomac. Winds should decrease overnight as the gradient
relaxes. A cold front will pass through early Wednesday morning
and northwest winds will increase behind the boundary with gusts
20 to 30 knots most likely. An SCA is in effect for the waters.

High pressure will build over the waters for Wednesday night
through Thursday night. An SCA may be needed for portions of the
waters Wednesday night.

Sub-sca conditions expected Friday with surface high pressure. Sca
possible Friday night and Saturday ahead of next frontal system.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until midnight est tonight for anz531>534-

Small craft advisory from 6 am to 6 pm est Wednesday for

Small craft advisory from 6 am this morning to 6 pm est this
evening for anz535-536-538.

Small craft advisory from 6 am this morning to midnight est
tonight for anz530.

Synopsis... Bjl
near term... Bjl
short term... Bjl
long term... Mm
aviation... Bjl mm
marine... Bjl mm

Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
APAM2 - 8575512 - Annapolis, MD 4 mi38 min 44°F 1020.2 hPa
44063 - Annapolis 6 mi36 min SSW 14 G 18 46°F 1020.4 hPa
CPVM2 8 mi38 min 49°F 34°F
TPLM2 - Thomas Point, MD 10 mi56 min SSW 20 G 23 47°F 53°F
44043 - Patapsco, MD 11 mi36 min SSW 14 G 18 46°F 1020.9 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 13 mi38 min SSW 8 G 11 43°F 1020.1 hPa
BLTM2 - 8574680 - Baltimore, MD 17 mi44 min W 1.9 G 2.9 39°F 54°F1019.8 hPa
BSLM2 - Chesapeake Bay, MD 20 mi86 min S 5.1 38°F 1021 hPa32°F
TCBM2 - 8573364 - Tolchester Beach, MD 20 mi38 min SSW 8 G 12 47°F 49°F1020.8 hPa
WASD2 - 8594900 - Washington, DC 28 mi38 min SSW 6 G 7 43°F 48°F1020.8 hPa
44062 - Gooses Reef, MD 33 mi36 min W 18 G 19 48°F 1020.8 hPa
CA2 - 8571892 - Cambridge, MD 40 mi44 min 43°F 49°F1022.5 hPa
44057 - Susquehanna, MD 43 mi36 min S 7.8 G 12 45°F 1020.3 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 44 mi38 min SW 13 G 16 46°F 1022.3 hPa
SLIM2 - 8577330 - Solomons Island, MD 49 mi38 min SW 13 G 20 46°F 53°F1021.5 hPa

Wind History for Francis Scott Key Bridge NE Tower, MD
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1 day
2 days

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Annapolis, United States Naval Academy, MD4 mi62 minSSW 610.00 miFair45°F30°F56%1020.5 hPa
Bay Bridge Field, MD11 mi76 minSSW 10 G 1810.00 miFair46°F32°F57%1021 hPa
Fort Meade / Tipton, MD13 mi71 minS 310.00 miFair28°F28°F100%1021 hPa
Baltimore, Baltimore-Washington International Airport, MD13 mi62 minSSW 610.00 miA Few Clouds37°F28°F70%1019.9 hPa
Baltimore, Inner Harbor, MD18 mi2 hrsno data mi39°F28°F65%1020.1 hPa
College Park Airport, MD21 mi70 minS 310.00 miFair40°F27°F62%1020.3 hPa
Baltimore / Martin, MD22 mi71 minS 510.00 miClear43°F32°F66%1020.7 hPa
Camp Springs / Andrews Air Force Base, MD23 mi60 minS 710.00 miFair37°F27°F68%1021.2 hPa

Wind History from NAK (wind in knots)
Last 24hr------NW10
1 day ago------------------------NW9
2 days ago------------------------------------------------

Tide / Current Tables for Brewer Point, Maryland
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Brewer Point
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Tue -- 02:12 AM EST     0.22 feet Low Tide
Tue -- 06:55 AM EST     Sunrise
Tue -- 07:00 AM EST     0.65 feet High Tide
Tue -- 09:26 AM EST     Moonrise
Tue -- 12:47 PM EST     0.01 feet Low Tide
Tue -- 04:47 PM EST     Sunset
Tue -- 07:28 PM EST     Moonset
Tue -- 07:39 PM EST     1.07 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Tide / Current Tables for Baltimore Harbor Approach, Maryland Current
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Baltimore Harbor Approach
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Tue -- 01:06 AM EST     -1.02 knots Max Ebb
Tue -- 04:50 AM EST     0.00 knots Slack
Tue -- 06:55 AM EST     Sunrise
Tue -- 07:20 AM EST     0.51 knots Max Flood
Tue -- 09:25 AM EST     Moonrise
Tue -- 10:05 AM EST     -0.00 knots Slack
Tue -- 12:47 PM EST     -0.50 knots Max Ebb
Tue -- 03:17 PM EST     0.00 knots Slack
Tue -- 04:47 PM EST     Sunset
Tue -- 07:00 PM EST     0.98 knots Max Flood
Tue -- 07:27 PM EST     Moonset
Tue -- 10:23 PM EST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Weather Map and Satellite Images
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Weather Map
IR Satellite Image from GEOS

GOES Local Image of Mid-Atlantic    EDIT

Wind Forecast for Baltimore, MD/Washington (6,6,7,8)
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Ground Weather Radar Station Dover AFB, DE
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weather_mapweather_map weather_map

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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.