Monday, November20, 2017 L-36.com


Marine Weather and Tides
Leonard, 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 6:54AMSunset 4:52PM Monday November 20, 2017 10:40 AM EST (15:40 UTC) Moonrise 8:34AMMoonset 6:45PM Illumination 4% Phase: Waxing Crescent; Moon at 2 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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ANZ542 Patuxent River To Broomes Island Md- 947 Am Est Mon Nov 20 2017
.small craft advisory in effect from late tonight through Tuesday evening...
Rest of today..W winds 10 to 15 kt. Waves 1 ft.
Tonight..SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Tue..S winds 10 to 15 kt with gusts to 25 kt. Waves 1 ft.
Tue night..SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely.
Wed..NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Wed night..N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Thu..W winds 5 to 10 kt. Waves 1 ft.
Fri..SW winds 5 kt. Waves less than 1 ft.
ANZ500 947 Am Est Mon Nov 20 2017
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build to our south through tonight. The high will move offshore Tuesday and a cold front will pass through late Tuesday night into Wednesday. High pressure will return for the second half of the week. A small craft advisory may be needed for portions of the waters Tuesday night through Wednesday night.

7 Day Forecast for Marine Location Near Leonard, MD
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location: 38.28, -76.63     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 201536
afdlwx
area forecast discussion
national weather service baltimore md washington dc
1036 am est Mon nov 20 2017

Synopsis
High pressure will build to our south through tonight. The high
will move offshore Tuesday and a cold front will pass through
Tuesday night into 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.

Near term through tonight
Upper-level trough moving east of us this morning while surface
high pressure builds to the south. Rising heights will allow
plenty of sunshine this afternoon... But temps will still be
below average for this time of year. MAX temps will range from
the upper 30s along the ridges of the allegheny highlands... To
the mid and upper 40s in northern maryland... To the middle 50s
in central virginia.

The high will remain to the south tonight. A weak shortwave in
a southwest flow aloft may bring a few high clouds... But dry
conditions will persist. Min temps will range from the mid and
upper 20s in the colder valleys to the mid and upper 30s in
downtown washington and baltimore.

Short term Tuesday through Wednesday night
High pressure will shift offshore Tuesday while a cold front
moves through the great lakes. A southwest flow in between these
systems will allow for milder conditions. MAX temps will be in
the upper 50s to lower 60s across most locations. There will be
some high clouds in a southwest flow aloft... But the cloud deck
should be thin enough for a partly to mostly sunny sky much of
the day.

The cold front will approach our area from the north and west
Tuesday evening before passing through overnight Tuesday into
early Wednesday morning. There will be separation between the
lift associated with the cold front and deeper moisture to our
south and east. Latest guidance shows that some of this moisture
can get drawn up into the front... Bringing the chance for
showers. The best chance for showers will be across eastern
areas where moisture has a better chance to move in before the
frontal passage.

Any showers early Wednesday morning should dissipate as the cold
front moves off to the south and east. A northwest flow will
cause chillier conditions despite increasing sunshine. High
pressure will settle overhead and it will turn out dry and cold.

Did also want to note that a few snow showers are possible along
and west of the allegheny front Tuesday night into early
Wednesday. However... As discussed earlier moisture should be
limited so any accumulation would be light.

Long term Thursday through Sunday
Longwave western us ridging and east coast troughing will
continue to dominate the weather pattern over the united states
through the holiday weekend. While no significant storm systems
are currently forecast, several upper level impulses will move
through the large-scale troughing.

Sprawling surface high pressure is expected to be in place on
thanksgiving day from the southern plains extending
northeastward through the appalachians. At the same time, weak
shortwave energy in both the northern and southern branches of
the jet stream will be moving towards the east coast and may
lead to surface cyclogensis off the southeastern us coastline.

At this time, the surface ridging and flow aloft is expected to
keep anything that can develop well to our south and east,
leading to a dry and uneventful weather forecast for
thanksgiving day. Surface ridging is expected to persist into
Friday as well, keeping the forecast dry.

By Friday night and Saturday, a more potent northern stream
system will move into the upper midwest, with its associated
cold front barrelling towards the mid-atlantic Saturday night.

Once again, southern stream energy will be present as well near
the southeastern states, and the potential exists for surface
cyclogenesis to occur. At this time, fast flow aloft and
orientation of upper level trough suggests that a track well
offshore is favored. However, chances for rain showers increase,
either with the offshore low or with the cold front itself.

Following the front Sunday, blustery and colder conditions are
likely, along with the potential for snow showers over the
higher terrain.

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

Aviation 15z Monday through Friday
Vfr conditions will persist through Tuesday. Winds are mostly
below 15 knots at present and will gradually turn to the
southwest this afternoon and continue like so tonight.

On Tuesday, southwest winds will continue, with gusts around 20
knots in the afternoon. A cold front will pass through Tuesday
night into early Wednesday. A few showers are possible along
with subvfr cigs. The best chance for this will be across the
eastern terminals.VFR conditions will return behind the cold
front for later Wednesday through Wednesday night.

Vfr and light winds expected Thursday and Friday with surface
high pressure

Marine
West winds this morning will gradually turn to the southwest
this afternoon. Wind gusts should gradually diminish throughout
the day. SCA continues across portions of the bay thru the day,
but winds may drop below SCA criteria on all waters late in the
afternoon. However, southerly channeling will develop this
evening as high pressure shifts east, with SCA returning, so
the period of sub SCA will likely be less than 6 hours where the
sca remains in effect through the period.

High pressure will move offshore Tuesday. South to southwest
winds will increase during this time ahead of the next cold
front. Therefore, SCA for all the waters Tuesday. The SCA was
extended into Tuesday evening for portions of the waters.

A cold front will pass through the waters late Tuesday night
into Wednesday morning. Northwest winds will pick up behind the
front and an SCA may be needed for portions of the waters later
Wednesday into Wednesday night.

Sub-sca conditions expected Thursday and Friday with surface
high pressure.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... Small craft advisory until 6 pm est this evening for anz530-
531-539.

Small craft advisory from midnight tonight to midnight est
Tuesday night for anz531-539-542.

Small craft advisory from 6 am to 6 pm est Tuesday for anz535-
536-538.

Small craft advisory until midnight est Tuesday night for
anz532>534-540-541-543.

Small craft advisory from 6 am Tuesday to midnight est Tuesday
night for anz530.

Small craft advisory until noon est today for anz537.

Small craft advisory from 6 pm this evening to midnight est
Tuesday night for anz537.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SLIM2 - 8577330 - Solomons Island, MD 10 mi40 min W 7 G 9.9 44°F 54°F1022.8 hPa (+2.2)
PPTM2 - 8578240 - Piney Point, MD 11 mi40 min NW 11 G 12
COVM2 - 8577018 - Cove Point LNG Pier, MD 15 mi40 min WNW 11 G 15 42°F 1023.7 hPa (+2.2)
LWTV2 - 8635750 - Lewisetta, VA 22 mi40 min NW 5.1 G 6 43°F 50°F1023.6 hPa (+2.1)
NCDV2 22 mi40 min NW 1.9 G 6 44°F 52°F1022.7 hPa (+2.0)
44062 - Gooses Reef, MD 22 mi30 min WNW 14 G 21 43°F 1 ft1024.7 hPa
44042 - Potomac, MD 23 mi30 min NW 9.7 G 14 43°F 1 ft1022.9 hPa
BISM2 - 8571421 - Bishops Head, MD 32 mi40 min WNW 15 G 17 42°F 44°F1023.5 hPa (+2.3)
BSLM2 - Chesapeake Bay, MD 35 mi70 min WNW 6 41°F 1022 hPa22°F
CA2 - 8571892 - Cambridge, MD 36 mi40 min 44°F 50°F1023.5 hPa (+2.2)
TPLM2 - Thomas Point, MD 44 mi40 min W 14 G 16 41°F 52°F
WASD2 - 8594900 - Washington, DC 46 mi40 min W 8.9 G 13 42°F 48°F1023.5 hPa (+2.2)
44063 - Annapolis 48 mi30 min NNW 12 G 16 42°F 1022.6 hPa
APAM2 - 8575512 - Annapolis, MD 49 mi40 min 43°F 1022 hPa (+1.9)

Wind History for Solomons Island, MD
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NW15
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NW7
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G12
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St Marys County Airport, MD5 mi54 minW 810.00 miFair43°F23°F46%1023.4 hPa
Patuxent River, Naval Air Station, MD12 mi48 minW 910.00 miFair44°F21°F41%1023 hPa
St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity, MD14 mi47 minWNW 610.00 miFair44°F25°F47%1023.2 hPa

Wind History from 2W6 (wind in knots)
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W5NW3CalmW6W3CalmW3W4CalmW6NW3NW4W4NW4NW5W8
1 day agoS12
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2 days agoNW5NW7W8W5NW4W4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS3S4SW7
G14
S7SW6S9
G16

Tide / Current Tables for Leonardtown, Breton Bay, Potomac River, Maryland
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Leonardtown
Click for Map
Mon -- 03:18 AM EST     1.66 feet High Tide
Mon -- 06:53 AM EST     Sunrise
Mon -- 08:33 AM EST     Moonrise
Mon -- 09:10 AM EST     0.03 feet Low Tide
Mon -- 03:24 PM EST     1.85 feet High Tide
Mon -- 04:50 PM EST     Sunset
Mon -- 06:45 PM EST     Moonset
Mon -- 10:01 PM EST     0.04 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.81.21.51.71.61.20.80.40.200.10.40.91.41.71.81.81.51.10.70.40.200.1

Tide / Current Tables for Point Patience, 0.1 mile southwest of, Maryland Current
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Point Patience
Click for MapFlood direction 315 true
Ebb direction 145 true

Mon -- 12:23 AM EST     0.32 knots Max Flood
Mon -- 02:31 AM EST     -0.00 knots Slack
Mon -- 06:03 AM EST     -0.56 knots Max Ebb
Mon -- 06:53 AM EST     Sunrise
Mon -- 08:33 AM EST     Moonrise
Mon -- 09:31 AM EST     0.00 knots Slack
Mon -- 12:07 PM EST     0.63 knots Max Flood
Mon -- 02:58 PM EST     -0.00 knots Slack
Mon -- 04:49 PM EST     Sunset
Mon -- 06:44 PM EST     Moonset
Mon -- 07:05 PM EST     -1.02 knots Max Ebb
Mon -- 11:43 PM EST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.30.1-0.1-0.3-0.5-0.6-0.5-0.4-0.10.20.50.60.60.3-0-0.4-0.7-0.9-1-1-0.8-0.5-0.2

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 (10,2,3,4)
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Ground Weather Radar Station Dover AFB, DE
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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.