Tuesday, January21, 2020
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Marine Weather and Tides
Washington Boro, PA

Version 3.4
NOTICE
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 7:20AMSunset 5:11PM Tuesday January 21, 2020 9:42 AM EST (14:42 UTC) Moonrise 4:36AMMoonset 2:20PM Illumination 13% Phase: Waning Crescent; Moon at 26 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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ANZ530 Chesapeake Bay North Of Pooles Island- 638 Am Est Tue Jan 21 2020
Today..N winds 10 kt. Waves 1 ft.
Tonight..NW winds 5 to 10 kt. Waves 1 ft.
Wed..N winds 5 kt. Waves flat.
Wed night..N winds around 5 kt. Waves flat.
Thu..N winds around 5 kt. Waves flat.
Thu night..N winds around 5 kt. Waves flat.
Fri..E winds 5 to 10 kt. Waves 1 ft or less. Rain likely through the night.
Sat..NE winds 10 to 15 kt...becoming nw 5 to 10 kt. Waves 1 to 2 ft. Rain through the day, then a chance of showers through the night.
ANZ500 638 Am Est Tue Jan 21 2020
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build eastward from the mississippi valley through Wednesday, then move offshore during the second half of the week. A low pressure system will approach on Saturday.


7 Day Forecast for Marine Location Near Washington Boro CDP, PA
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location: 40, -76.49     debug


Area Discussion for - Baltimore, MD/Washington
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FXUS61 KLWX 210859 AFDLWX

Area Forecast Discussion National Weather Service Baltimore MD/Washington DC 359 AM EST Tue Jan 21 2020

SYNOPSIS. A large area of high pressure will move from this Mississippi Valley through Wednesday. The high will move offshore during the second half of the week, then low pressure will approach from the central United States on Saturday.

NEAR TERM /THROUGH TONIGHT/. Strong high pressure is located over the mid Mississippi Valley this morning. Aloft, a positively tilted trough extends across the area to a developing closed low over the Tennessee Valley. There's enough moisture in the trough to be resulting in some flurries west of the Allegheny Front, but with a low Froude number, very little of it (or clouds for that matter) is spilling into our CWA. Otherwise, it's a clear and cold start to the morning, with temperatures from the teens to mid 20s for most. Some places have enough wind to knock 5- 10 degrees off those values for the wind chill.

The closed low will dip into the southeastern states through tonight while the surface high will build toward the Ohio Valley. Some mid and high clouds may skirt by this evening, but otherwise skies will be clear. With 925mb temperatures similar to what they were Monday, expect similar high temperatures ranging through the 30s. There will be a bit less wind, though. Dew points will remain in the low to mid teens through tonight, so would expect that to be the bottom threshold for low temperatures, with the most favorable radiational cooling conditions likely in the valleys west of the Blue Ridge. Urbanized areas will be closer to the mid 20s.

SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/. Heights will rise on Wednesday as a ridge axis builds in from the west, and the surface high will move overhead. Both of these features will progress eastward Thursday. Daytime highs will moderate as a result, with upper 30s-mid 40s Wednesday and 40s to near 50 Thursday. Wednesday night will likely still be chilly with a continuation of clear skies and light winds. Mid/high clouds will be increasing Thursday and Thursday night ahead of a trough in the nation's midsection. Combined with rising dew points, Thursday night lows will be a bit warmer in the mid 20s to lower 30s.

LONG TERM /FRIDAY THROUGH MONDAY/. High pressure will be moving to our north on Friday while a mid to upper level trough deepens over the central CONUS, resulting in a mid-level cut-off low. At the surface, low pressure system will develop over the Midwest followed by an ENE track and approaching our region. This will increase the chances of precipitation over our region Friday night as the low pressure moves across the Ohio Valley. This will then develop into a coastal low Saturday into Saturday night. Rain or snow are possible as this system moves across our area between Friday night and Saturday night, with the best chance of any wintry weather west of the Blue Ridge. The low will deepen offshore Saturday night into Sunday, with possible rain and/or snow showers lingering into Sunday. Upslope snow is possible into Monday and remaining dry into Tuesday.

AVIATION /09Z TUESDAY THROUGH SATURDAY/. VFR conditions will continue through Thursday night as high pressure moves across the area. Northwest to north winds will be around 10 kt or less through tonight, then light and variable through Thursday night.

VFR conditions expected Friday with high pressure in control. Sub- VFR conditions could begin Friday night with a low pressure impacting our region and remaining into Saturday night. This system could bring rain and/or snow showers over the terminals (any chance of snow is higher at MRB at this time). A few rain or snow showers could remain into Sunday as winds increase.

MARINE. There are some gusts of 20-25 kt early this morning on waters open to the NNW fetch . generally on waters south of the Bay bridge, though there are a few sporadic reports elsewhere. Should see these winds weaken by midday as the pressure pattern relaxes a bit. However, there may be enough wind in the column to combine with northerly channeling to keep some higher gusts on the wider waters south of Drum Point through tonight, so a Small Craft Advisory will remain in effect for these locations. By Wednesday morning, winds will become lighter as high pressure moves overhead, with such conditions continuing through Thursday night.

Sub-SCA conditions are expected on Friday with high pressure in control. SCA conditions possible Friday night into Sunday with low pressure moving across our area and intensifying offshore.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 1 PM EST this afternoon for ANZ532- 533-541. Small Craft Advisory until 1 AM EST Wednesday for ANZ534-537- 543.

SYNOPSIS . ADS NEAR TERM . ADS SHORT TERM . ADS LONG TERM . IMR AVIATION . ADS/IMR MARINE . ADS/IMR


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 49 mi60 min NNW 4.1 G 6 23°F 39°F1033.6 hPa
BLTM2 - 8574680 - Baltimore, MD 51 mi60 min N 8.9 G 12 25°F 39°F1033.5 hPa
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 54 mi54 min NNW 16 G 20 25°F 1033.6 hPa

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lancaster, Lancaster Airport, PA13 mi49 minWNW 710.00 miFair22°F10°F63%1033.2 hPa
Harrisburg, Harrisburg International Airport, PA21 mi1.8 hrsNW 710.00 miFair22°F10°F63%1033.1 hPa
York, York Airport, PA21 mi49 minW 610.00 miFair22°F10°F63%1034 hPa

Link to 5 minute data for KLNS

Wind History from LNS (wind in knots)
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N9NW10NW9NW6NW4W4NW5W3NW4CalmCalmNW3W4NW5W4W5W7W6W7
1 day agoW14NW11
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2 days agoSE7SE8S9SE7SE6SE8SE7SE10S8S6SW10
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S7SW7S7SW4SW3CalmCalmSW3CalmSW5W6W7NW6

Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Tue -- 03:32 AM EST     -0.08 feet Low Tide
Tue -- 04:34 AM EST     Moonrise
Tue -- 07:10 AM EST     1.11 feet High Tide
Tue -- 07:20 AM EST     Sunrise
Tue -- 02:20 PM EST     Moonset
Tue -- 02:26 PM EST     -0.88 feet Low Tide
Tue -- 05:10 PM EST     Sunset
Tue -- 08:29 PM EST     2.36 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.50.2-0-00.30.81.110.80.40-0.4-0.7-0.9-0.8-0.40.31.21.92.32.32.21.8

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Tue -- 01:48 AM EST     -0.24 feet Low Tide
Tue -- 04:33 AM EST     Moonrise
Tue -- 07:03 AM EST     1.30 feet High Tide
Tue -- 07:20 AM EST     Sunrise
Tue -- 12:57 PM EST     -0.12 feet Low Tide
Tue -- 02:20 PM EST     Moonset
Tue -- 05:11 PM EST     Sunset
Tue -- 07:10 PM EST     2.28 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.2-0.1-0.2-00.40.81.21.31.210.60.3-0-0.100.51.11.72.12.32.221.61.1

Weather Map
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wmap_A
GEOS Local Image of Mid-Atlantic    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
Wind Forecast for Baltimore, MD/Washington (9,2,3,4)
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Ground Weather Radar Station Dover AFB, DE
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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.