Saturday, December7, 2019
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Marine Weather and Tides
Washington Boro, PA

Version 3.4
NOTICE
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.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 7:12AMSunset 4:41PM Saturday December 7, 2019 4:21 AM EST (09:21 UTC) Moonrise 2:22PMMoonset 2:23AM Illumination 79% Phase: Waxing Gibbous; Moon at 10 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- 338 Am Est Sat Dec 7 2019
Rest of the overnight..NW winds 10 kt. Waves 1 ft.
Today..NW winds 5 to 10 kt. Waves 1 ft.
Tonight..NE winds 5 kt. Waves flat.
Sun..SE winds 5 kt. Waves less than 1 ft.
Sun night..S winds 5 kt. Waves less than 1 ft. A chance of showers.
Mon..S winds 5 to 10 kt. Waves 1 ft or less. Rain.
Mon night..SW winds 10 to 15 kt. Waves 2 ft. Rain.
Tue..SW winds 10 to 15 kt...becoming nw 5 to 10 kt. Waves 1 to 2 ft. Showers.
Wed..NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the day.
ANZ500 338 Am Est Sat Dec 7 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure will build across the region through the weekend. A strong area of low pressure will then develop over the mid- mississippi valley and track northeastward toward the eastern great lakes early next week. Small craft advisories may be needed Monday night through Tuesday.


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 070902 CCA AFDLWX

Area Forecast Discussion . corrected National Weather Service Baltimore MD/Washington DC 400 AM EST Sat Dec 7 2019

SYNOPSIS. High pressure will build across the region through the weekend. A strong area of low pressure will then develop over the Mid- Mississippi Valley and track northeastward toward the eastern Great Lakes early next week, with warm and wet weather enveloping the region. Cold Canadian high pressure will follow that system later in the week.

NEAR TERM /THROUGH TONIGHT/. High pressure currently located over the Midwest will move east and will be centered overhead this evening. Light winds and dry conditions are expected today and into tonight. Cold air advection, light winds and clear skies will allow for radiational cooling tonight and temperatures will be in the 20s over most of our CWA.

SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/. High pressure will be moving offshore on on Sunday which will cause winds to become southerly. This will allow for warm and moist air advection while temperatures will climb into the mid to upper 40s over most of our area.

Clouds will be increasing late on Sunday as a weak wave of low pressure over the Carolinas moves north into Sunday night. This will increase the chance of showers over our area, especially late Sunday night. This wave of low pressure will continue to move north into our are on Monday while another low pressure system pushes NE from the ArkLaTex region into the Great Lakes as it deepens. Aloft, a digging trough will be pushing into the central CONUS and then east into Monday.

Deep moisture ahead of this system and its associated cold front, along with lift from a low and upper level jet will combine to bring rain over our area Monday into Monday night. PWAT values are between half and 1.25 inches during this period.

LONG TERM /TUESDAY THROUGH FRIDAY/. Cold front will likely be just west of the region early Tuesday, but will be heading eastward through the day and night, crossing our region by late Tuesday night. There may be some dry time before the front arrives, and southerly flow may elevate temperatures into the 60s, so there is a window of some relatively good weather possible. Timing this far out remains highly uncertain.

The front appears to be of an anafront nature, which means that most precipitation will end up falling behind the boundary in the cooler air, and some of the rain may linger into early Wednesday. That having been said, the hints of a change to snow on the back side are rather meager, so have kept any mention of snow well northwest of the I-95 corridor on Tuesday night and Wednesday.

Canadian high pressure will then build across the region for the remainder of the week, resulting in chilly but dry weather. Temperatures will be below normal, but not exceptionally so. Just a reminder that it is meteorological winter.

AVIATION /09Z SATURDAY THROUGH WEDNESDAY/. Winds have diminished over the terminals and clouds have dissipated at this time. VFR conditions are expected to continue through Sunday with high pressure in control. Sub-VFR conditions possible late Sunday night into Monday night with rain moving over the terminals associated to a low pressure system and its cold front.

Sub-VFR conditions will be likely at times Tuesday into Tuesday night as a cold front crosses the region with rain showers. VFR conditions likely return behind the system on Wednesday. Winds may gust 20-30 knots through Tuesday and Wednesday, starting out more southerly Tuesday but ending up northwesterly by Wednesday.

MARINE. A Small Craft Advisory is in effect through Saturday morning. Winds will be on the decrease Saturday as high pressures moves east and builds into our area. Winds will remain below criteria through Sunday night as high pressure remains in control. Another Small Craft May be needed on Monday as gradient tightens over the waters.

Small Craft Advisories look possible Tuesday as southerly flow increases ahead of an approaching cold front. They are likely by Wednesday as northwest winds pick up behind the front.

LWX WATCHES/WARNINGS/ADVISORIES. DC . None. MD . None. VA . None. WV . None. MARINE . Small Craft Advisory until 6 AM EST early this morning for ANZ531-532-535-536-538>540. Small Craft Advisory until noon EST today for ANZ533-534-537- 541>543.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHCM2 - 8573927 - Chesapeake City, MD 49 mi51 min NNW 5.1 G 8
BLTM2 - 8574680 - Baltimore, MD 51 mi51 min N 5.1 G 8
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 54 mi51 min NNW 12 G 14 40°F 1025.6 hPa

Wind History for Chesapeake City, MD
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Lancaster, Lancaster Airport, PA13 mi28 minWNW 410.00 miFair32°F18°F56%1025.6 hPa
Harrisburg, Harrisburg International Airport, PA21 mi25 minN 310.00 miA Few Clouds27°F19°F72%1025.7 hPa
York, York Airport, PA21 mi28 minN 010.00 miA Few Clouds26°F19°F75%1026 hPa

Link to 5 minute data for KLNS

Wind History from LNS (wind in knots)
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Last 24hrCalmCalmS3E3CalmSW8SW10SW6SW8SW8SW4SW6W3W9W5NW10NW13
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2 days agoW6W7SW5W3W4SW5SW8SW9W10W7SW7SW7SW5SW7W4SW4W6W5W8W8W9W8W10W11

Tide / Current Tables for Port Deposit, Susquehanna River, Maryland
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Port Deposit
Click for Map
Sat -- 01:49 AM EST     0.54 feet Low Tide
Sat -- 02:21 AM EST     Moonset
Sat -- 06:27 AM EST     1.86 feet High Tide
Sat -- 07:11 AM EST     Sunrise
Sat -- 02:01 PM EST     -0.04 feet Low Tide
Sat -- 02:20 PM EST     Moonrise
Sat -- 04:40 PM EST     Sunset
Sat -- 07:30 PM EST     2.03 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.70.60.50.71.11.61.81.81.71.410.60.30-00.10.61.21.7221.91.61.3

Tide / Current Tables for Havre de Grace, Susquehanna River, Maryland
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Havre de Grace
Click for Map
Sat -- 12:26 AM EST     0.27 feet Low Tide
Sat -- 02:21 AM EST     Moonset
Sat -- 06:02 AM EST     1.57 feet High Tide
Sat -- 07:11 AM EST     Sunrise
Sat -- 12:16 PM EST     0.10 feet Low Tide
Sat -- 02:20 PM EST     Moonrise
Sat -- 04:40 PM EST     Sunset
Sat -- 06:33 PM EST     1.99 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.30.50.81.21.51.61.51.20.90.60.30.10.20.40.91.31.7221.81.51.10.7

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 (4,6,7,8)
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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 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.