Thursday, August13, 2020
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Marine Weather and Tides
Littlejohn Island, ME

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 5:40AMSunset 7:48PM Thursday August 13, 2020 1:34 PM EDT (17:34 UTC) Moonrise 12:16AMMoonset 3:34PM Illumination 27% Phase: Waning Crescent; Moon at 24 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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ANZ153 Casco Bay- 1111 Am Edt Thu Aug 13 2020
This afternoon..NE winds around 5 kt, becoming se early, then becoming S late. Seas 1 foot or less.
Tonight..SW winds around 5 kt, becoming nw after midnight. Seas 1 foot or less.
Fri..N winds around 5 kt, becoming E in the afternoon. Seas 1 foot or less.
Fri night..E winds around 5 kt, becoming N after midnight. Seas 1 foot or less, then around 2 ft after midnight.
Sat..E winds 5 to 10 kt. Seas 2 to 3 ft.
Sat night..SE winds around 5 kt, becoming N around 5 kt after midnight. Seas around 2 ft.
Sun..NE winds 5 to 10 kt, becoming se in the afternoon. Seas 2 to 3 ft.
Sun night..S winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers after midnight.
Mon..S winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers.
Mon night..S winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers.
ANZ100 1111 Am Edt Thu Aug 13 2020
Synopsis for stonington me to merrimack river ma out to 25 nm.. High pressure builds out of northern canada and into the maritimes through the weekend. A slow moving frontal system will approach the waters by early next week. &&


7 Day Forecast for Marine Location Near Littlejohn Island, ME
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location: 43.78, -70.08     debug


Area Discussion for - Gray/Portland, ME
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FXUS61 KGYX 131514 AFDGYX

Area Forecast Discussion National Weather Service Gray ME 1114 AM EDT Thu Aug 13 2020

SYNOPSIS. It'll be another warm day today, but with much less humidity. The temperature will cool off at night and then gradually cool through the weekend as high pressure builds into the Canadian Maritimes. A slow moving frontal system could bring rain early next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/. Update . Temps warming quickly along the coastal plain and so I have tweaked readings up and more quickly before sea breezes are expected to form this afternoon.

ORIGINAL DISCUSSION . High pressure to our north will remain in control of the weather today with plenty of sunshine and light winds expected. Last night's GYX sounding revealed a subsidence inversion around 700MB which has been lowering with each sounding the past few days. Expect it will be even a bit lower this morning and within range for us to mix to this afternoon. While we won't mix out this inversion, we will mix into the bottom of it. This leads us to believe that temperatures should warm up into the 87-88F range at sea level and level off right about there as any further heating would force mixing through the whole column. Within this subsidence inversion exists some very dry air, and we expect that as we mix deeply today we will tap into this drier air and see dewpoints fall into the low 50s. Typically it's hard for dewpoints to fall lower than the 50s this time of year due to foliage, but recent dry weather could challenge that. Have lowered forecast dewpoint values from guidance and favored the CMC as it tends to handle mix down scenarios better.

With light winds expected we should see a sea breeze develop along the coast this afternoon. It will be a bit delayed, though, considering water temperatures are near their annual peak and thus the temperature gradient will not be as high as earlier in the season. However, we should see this bring a shift in wind direction, slight decrease in temperature, and increase in dewpoint to the entire coastline this afternoon.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/. Mostly calm conditions overnight with dry air in place will lead to a good cool down for most. 50s should be widespread with some northern valleys dropping into the 40s. Warmer southern towns may still hold in the 60s.

Friday will be another nice day but several degrees cooler than today. Still should see widespread temperatures in the 80s. An upper trough drops south through the Canadian Maritimes extending westward into northern New England, but the lack of moisture will make it difficult for showers to form.

LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/. The ensemble and deterministic model solutions remain in good agreement on the long wave pattern through the upcoming weekend and the first half of next week. The period begins with an upper trough across New England for Saturday along with the possibility of widely scattered convection. The trough shifts offshore by late Saturday with rising heights and weak ridging for late Saturday and early Sunday. The flattening ridge is quickly replaced by an upper trough stretching from the Great Lakes through the northeast by late Sunday and the start of the new work week. A series of passing impulses and a slow-moving frontal system will bring increasingly more humid and unsettled weather to the region through the middle of next week.

AVIATION /15Z THURSDAY THROUGH MONDAY/. Short Term . VFR expected with the exception of early morning fog at Lebanon and Whitefield. Light northwest winds become variable at times today while a late sea breeze also arrives at the coast.

Long Term .

Sat - Sun . Isolated MVFR possible in -SHRA.

MARINE. Short Term . Light winds and low seas expected as high pressure is in control.

Long Term .

Sat PM - Mon . An extended period of onshore flow may produce SCA's outside the bays.

GYX WATCHES/WARNINGS/ADVISORIES. ME . None. NH . None. MARINE . None.



NEAR TERM . Legro


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CASM1 - 8418150 - Portland, ME 12 mi46 min 80°F 69°F
44007 - PORTLAND 12 NM Southeast of Portland,ME 18 mi44 min SE 3.9 G 3.9 74°F 69°F1 ft1018.8 hPa (-0.4)
44032 - Buoy E0104 - Central Maine Shelf 39 mi150 min WSW 1.9 G 3.9 74°F 71°F1 ft1017.8 hPa
WEXM1 - Wells Reserve, ME 39 mi94 min ESE 4.1 82°F 64°F
WELM1 - 8419317 - Wells, ME 41 mi46 min SSE 5.1 G 6 78°F 70°F1019.1 hPa
44030 - Buoy B0102 - Western Maine Shelf 45 mi90 min ENE 1.9 G 1.9 1 ft

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portland, Portland International Jetport, ME15 mi43 minS 610.00 miMostly Cloudy86°F57°F39%1018.8 hPa
Auburn-Lewiston, ME22 mi38 minNW 410.00 miPartly Cloudy84°F59°F43%1019.5 hPa
Wiscasset Airport, ME23 mi41 minVar 310.00 miMostly Cloudy85°F57°F39%1018.8 hPa

Link to 5 minute data for KPWM

Wind History from PWM (wind in knots)
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Last 24hrS7S8S7S6S5S6S4S4W3CalmCalmN4NW5CalmCalmCalmCalmW3NW5N7N5CalmE4S6
1 day agoS10S10S11S10
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S11S8S10S9S8S5S4S6S5S3S4S3SW5SW6W9W8NW8N7NW74
2 days agoE4SE9SE8S6S6SE5S3E3CalmCalmCalmN3N3CalmCalmCalmCalmCalmCalm5CalmE5SE8SE9

Tide / Current Tables for Chebeague Point, Great Chebeague Island, Maine
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Chebeague Point
Click for Map
Thu -- 12:15 AM EDT     Moonrise
Thu -- 12:30 AM EDT     1.55 feet Low Tide
Thu -- 05:43 AM EDT     Sunrise
Thu -- 06:48 AM EDT     7.63 feet High Tide
Thu -- 12:37 PM EDT     1.95 feet Low Tide
Thu -- 03:34 PM EDT     Moonset
Thu -- 07:02 PM EDT     8.65 feet High Tide
Thu -- 07:46 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.61.62.33.55.16.57.47.67.164.532.122.63.85.57.18.28.68.37.25.63.7

Tide / Current Tables for Upper Hell Gate (Sasanoa River, Maine) Current
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Upper Hell Gate (Sasanoa River
Click for Map
Thu -- 12:14 AM EDT     Moonrise
Thu -- 01:12 AM EDT     -0.66 knots Max Ebb
Thu -- 04:55 AM EDT     0.00 knots Slack
Thu -- 05:41 AM EDT     Sunrise
Thu -- 07:22 AM EDT     0.61 knots Max Flood
Thu -- 11:39 AM EDT     -0.00 knots Slack
Thu -- 01:32 PM EDT     -0.60 knots Max Ebb
Thu -- 03:33 PM EDT     Moonset
Thu -- 04:41 PM EDT     0.00 knots Slack
Thu -- 07:45 PM EDT     Sunset
Thu -- 07:46 PM EDT     0.78 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.4-0.7-0.6-0.3-0.200.40.60.60.50.40.3-0.2-0.5-0.6-0.3-0.10.10.40.70.80.70.60.4

Weather Map
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wmap_A
GEOS Local Image of Northeast    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 Gray/Portland, ME (13,3,4,5)
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Ground Weather Radar Station Portland, ME
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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 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.