Sunday, January17, 2021
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Marine Weather and Tides
Leonard, MD

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:21AMSunset 5:14PM Sunday January 17, 2021 4:45 AM EST (09:45 UTC) Moonrise 10:22AMMoonset 9:58PM Illumination 16% 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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ANZ542 Patuxent River To Broomes Island Md- 341 Am Est Sun Jan 17 2021
.small craft advisory in effect until 3 pm est this afternoon...
Rest of the overnight..SW winds 10 kt with gusts to 20 kt. Waves 1 ft.
Today..SW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Tonight..SW winds 10 kt with gusts to 20 kt. Waves 1 ft.
Mon..W winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft.
Mon night..W winds 10 kt with gusts to 20 kt. Waves 1 ft.
Tue..W winds 10 kt. Waves 1 ft.
Tue night..W winds 10 kt with gusts to 20 kt. Waves 1 ft.
Wed..NW winds 10 to 15 kt...becoming sw 5 kt after midnight. Waves 1 ft.
Thu..W winds 5 to 10 kt. Waves 1 ft.
ANZ500 341 Am Est Sun Jan 17 2021
Synopsis for the tidal potomac and md portion of the chesapeake bay.. Another upper level trough will swing through the region tonight, which could result in small craft advisories for portions of the waters. High pressure builds to the south of our region through the early parts of next week. Small craft advisories may be needed again on Wednesday.


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 170902 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 402 AM EST Sun Jan 17 2021

SYNOPSIS. High pressure will build south of the region Monday into Tuesday while low pressure remains over the eastern Great Lakes through mid week. A cold front will cross the area Thursday night. High pressure will build toward the region toward the end of the week.

NEAR TERM /THROUGH MONDAY/.

Clouds continue to build east of the mtns this morning and should continue to do that through the rest of the day with a generally cloudy/mostly cloudy day on tap. Snow showers should continue over the mtns through midday before shortwave-ridge axis builds overhead and activity wanes. A second and more significant round of mountain snow showers is expected late today through Monday as an upper low over the mid-MS valley pushes east. Snow accumulations will likely exceeed the advisory criteria but over a 24-hr period, but aren't likely to meet the 24-hr warning criteria of 8 inches. Also, very difficult to determine a 12-hr period of greatest accumulation as depth of moisture, temperatures, orographic lift, and winds are all fcst to remain the same over the entire 24-hr period. If I were to guess, perhaps the 03Z-15Z Mon time frame looks like the best period of most significant accumulation. Since a Winter Wx Advisory is already in effect, another one will not be issued at this time.

SHORT TERM /MONDAY NIGHT THROUGH TUESDAY NIGHT/.

Mountain snow showers will persist through mid week and likely beyond that in WNW flow and around longwave trough situated over the eastern half of the U.S. Elsewhere, generally fair weather and seasonable temperatures are expected with gusty W to NW winds as area remains between low pressure over the eastern Great Lks and high pressure over the Southeast.

LONG TERM /WEDNESDAY THROUGH SATURDAY/.

Seasonably cool with gusty winds out of the west-northwest at 20-30 mph on Wednesday, owing to the aforementioned cold front passage. This will keep wind chill values near to below freezing for much of the day. Otherwise, mostly dry across the region, aside from a few lingering upslope snow showers Wednesday morning along/west of the Allegheny Front.

Another frontal boundary will sweep through the region later Thursday, bringing a slight chance for some precipitation across the area. Timing will be key here, as some areas could see a rain/snow mix, or even all snow. The upper-level system ejecting out of the central Plains will be fairly weak, so have a hard time seeing much (if any) precip with this system outside of some potentially upslope snow showers once again. Recent model trends agree with this, as chance of precip has dropped greatly in the past few runs of guidance. So, will be coming down on POPs in the foreast for that period.

Progressively cooler Friday and Saturday as a reinforcing cold front pushes through Friday. This also appears to be dry in nature, but could see some more upslope snow out west. This should largely end by Saturday, as high pressure begins building in from the northwest, ushering in much cooler air into the region.

AVIATION /08Z SUNDAY THROUGH THURSDAY/.

BKN cigs 040-050 today with W winds 10-15kt. Clearing this evening before more clouds arrive late tonight and Mon in brisk NW flow. Winds will gust around 25kt Mon and Tue.

Gusty winds expected Wednesday out of the WNW, with gusts up to 30 knots possible at most terminals (maybe closer 35 knots at MRB and 20-25 at CHO). Expect VFR conditions during this time period though. Winds will relax Wednesday evening into THursday, with continued VFR conditions likely. There is a slight chance for some precipitation at all termiansl on Thursday, which could bring some flight restrictions, but that threat seems to have largely diminished with recent model runs.

MARINE.

SCA conditions into early afternoon and diminishing thereafter. However, winds may remain above SCA thresholds across the southern waters tonight and strengthen again Mon and remain brisk through Tue with gusts to around 25 kt. Expect winds to diminish at night.

Small Craft Advisories likely on Wednesday, with gusty WNW winds. Winds taper off into Wednesday evening and Thursday, but SCA's may still be needed, as it will be close to threshold.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . Winter Weather Advisory until 7 AM EST this morning for MDZ001. VA . None. WV . Winter Weather Advisory until 7 AM EST this morning for WVZ501- 505. MARINE . Small Craft Advisory until 3 PM EST this afternoon for ANZ530>543.

SYNOPSIS . LFR NEAR TERM . LFR/JMG SHORT TERM . LFR LONG TERM . CJL AVIATION . LFR/CJL MARINE . LFR/CJL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
SLIM2 - 8577330 - Solomons Island, MD 10 mi51 min WSW 9.9 G 15 36°F 1007.2 hPa
PPTM2 - 8578240 - Piney Point, MD 11 mi51 min W 8.9 G 15
LWTV2 - 8635750 - Lewisetta, VA 22 mi51 min W 9.9 G 12 34°F 41°F1008.1 hPa
44062 - Gooses Reef, MD 22 mi45 min WSW 16 G 18 37°F 41°F1 ft
NCDV2 22 mi51 min WSW 7 G 8 35°F 1007 hPa
44042 - Potomac, MD 23 mi33 min W 16 G 18 36°F 42°F1008.3 hPa
BISM2 - 8571421 - Bishops Head, MD 32 mi51 min W 19 G 22 38°F 1007.4 hPa
BSLM2 - Chesapeake Bay, MD 35 mi75 min SW 2.9 34°F 1006 hPa24°F
CA2 - 8571892 - Cambridge, MD 36 mi51 min SW 7 G 12 36°F 1007.1 hPa
TPLM2 - Thomas Point, MD 44 mi45 min SSW 12 G 14 36°F 41°F1007.3 hPa (+1.6)25°F
WASD2 - 8594900 - Washington, DC 46 mi51 min SSW 6 G 11 36°F 1007.2 hPa
APAM2 - 8575512 - Annapolis, MD 49 mi51 min SW 2.9 G 6 35°F 1006 hPa

Wind History for Solomons Island, MD
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
St Marys County Airport, MD5 mi50 minWSW 910.00 miFair32°F25°F75%1007.8 hPa
Patuxent River, Naval Air Station, MD12 mi53 minWSW 9 G 1610.00 miFair0°F0°F%1007.6 hPa
St. Inigoes, Webster Field, Naval Electronic Systems Engineering Activity, MD14 mi52 minWSW 1110.00 miFair39°F28°F65%1007.5 hPa

Link to 5 minute data for K2W6

Wind History from 2W6 (wind in knots)
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Last 24hrCalmW4W4W5W6W4W3W5W5W4W6NW6SW9
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1 day agoE3CalmE3E4SE7S4SE7SE8
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SE4SE6SE5SE5E4E3SE4CalmE4W3E3CalmW3NW4
2 days agoCalmCalmCalmW3W5CalmNW3N3NW3NE3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm

Tide / Current Tables for Leonardtown, Breton Bay, Maryland
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Leonardtown
Click for Map
Sun -- 05:19 AM EST     1.57 feet High Tide
Sun -- 07:21 AM EST     Sunrise
Sun -- 10:21 AM EST     Moonrise
Sun -- 11:30 AM EST     -0.12 feet Low Tide
Sun -- 05:12 PM EST     Sunset
Sun -- 05:41 PM EST     1.61 feet High Tide
Sun -- 09:57 PM EST     Moonset
Sun -- 11:56 PM EST     -0.11 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.10.20.71.11.41.61.51.20.80.40.1-0.1-0.10.10.611.41.61.61.410.60.30

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

Sun -- 12:24 AM EST     0.00 knots Slack
Sun -- 02:16 AM EST     0.45 knots Max Flood
Sun -- 04:52 AM EST     -0.00 knots Slack
Sun -- 07:20 AM EST     Sunrise
Sun -- 08:21 AM EST     -0.58 knots Max Ebb
Sun -- 10:21 AM EST     Moonrise
Sun -- 11:59 AM EST     0.00 knots Slack
Sun -- 02:08 PM EST     0.46 knots Max Flood
Sun -- 04:36 PM EST     -0.00 knots Slack
Sun -- 05:11 PM EST     Sunset
Sun -- 08:45 PM EST     -0.93 knots Max Ebb
Sun -- 09:57 PM EST     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.10.20.40.40.2-0-0.3-0.5-0.6-0.6-0.4-0.200.30.50.40.2-0.1-0.5-0.7-0.9-0.9-0.8-0.6

Weather Map
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wmap_A
GEOS 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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station




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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 numerous 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.