Tuesday, May11, 2021
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Marine Weather and Tides
Littlejohn Island, ME

Version 3.4
NOTICE
1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 5:16AMSunset 7:56PM Tuesday May 11, 2021 6:54 AM EDT (10:54 UTC) Moonrise 5:24AMMoonset 7:56PM Illumination 0% Phase: New Moon; Moon at 29 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- 334 Am Edt Tue May 11 2021
Today..W winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt late. Seas 2 to 3 ft. A slight chance of showers this afternoon.
Tonight..W winds around 10 kt with gusts up to 20 kt. Seas 2 to 3 ft, subsiding to 1 to 2 ft after midnight.
Wed..NW winds around 10 kt. Seas 1 to 2 ft.
Wed night..NW winds 5 to 10 kt. Seas 1 to 2 ft.
Thu..W winds 5 to 10 kt. Seas 1 to 2 ft.
Thu night..W winds 5 to 10 kt. Seas 1 foot or less.
Fri..W winds 5 to 10 kt, becoming sw in the afternoon. Seas 1 foot or less, then 1 to 2 ft in the afternoon.
Fri night..SW winds 5 to 10 kt, becoming nw after midnight. Seas 1 to 2 ft in the evening, then 1 foot or less.
Sat..NE winds around 5 kt, becoming se in the afternoon. Seas 1 foot or less. Scattered showers in the afternoon.
Sat night..SW winds around 5 kt. Seas 1 foot or less. Scattered showers in the evening.
ANZ100 334 Am Edt Tue May 11 2021
Synopsis for stonington me to merrimack river ma out to 25 nm.. West to northwest winds will continue over the waters through mid week with low pressure over the canadian maritimes and high pressure over the great lakes. An extended period of light winds and seas is expected late this week and weekend as high pressure moves over the waters.


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 110753 AFDGYX

Area Forecast Discussion National Weather Service Gray ME 353 AM EDT Tue May 11 2021

SYNOPSIS. Near normal temperatures are expected through the remainder of the week. Diurnally driven showers are possible today and Wednesday before drier weather arrives for the end of the week. Another disturbance will arrive this weekend with renewed shower chances.

NEAR TERM /UNTIL 6 PM THIS EVENING/. Impacts . Elevated fire weather conditions are expected this afternoon in southern NH. See the Fire Weather section below for more information.

Still seeing some showers moving through NH and northern portions of western ME at this hour. These should continue to move off to the northeast and diminish in coverage through the early morning hours.

Per satellite imagery, an upper level low is currently centered over the northern Great Lakes with a trough extending westward into northern ME. This low will push toward our region today with its core nearly overhead bye early Tuesday afternoon. Not much change in forecast thinking from the previous forecast as the low will provide some forcing for ascent and generate showers, primarily over northern areas, later this morning through this evening. Did keep slight chance of thunder in the forecast, mainly in the afternoon, as increasing lapse rates from the upper low being overhead may allow some stronger showers to grow rapidly enough to produce some lightning. Opted to leave out any mention of small hail or graupel . but would not be surprised if some of the stronger showers managed to produce either.

For southern areas . partly cloudy skies are expected with little chance for precipitation. It will be a bit breezy too as winds gust to 20-25 mph in the afternoon. Highs will range from the lower to mid 50s in the mountains to the upper 50s to mid 60s on the coastal plain.

SHORT TERM /6 PM THIS EVENING THROUGH 6 AM WEDNESDAY/. Impacts . No significant impacts anticipated.

The upper low will quickly move off to the east tonight . but we will see shower activity continue overnight as a weak surface trough linger near the international border. Those showers will generally be confined to the northernmost zones in NH and northwestern ME, and temperatures will be cold enough to support some snow mixing in with any rain. The rest of the CWA should remain dry under partly cloudy to mostly clear skies. Lows will range from the mid 30s to lower 40s.

LONG TERM /WEDNESDAY THROUGH MONDAY/. Impacts: Minimal weather impacts are expected through Tuesday.

Overview: On Wednesday and Thursday our area will be under shortwave troughing with cyclonic flow aloft as an area of low pressure sits over eastern Quebec. This will result in northwesterly winds at the surface and allow for upslope rain showers, especially across the mountains and far north. Friday will be mostly dry and warm as the flow weakens and brief shortwave riding moves in. This will then quickly be replaced by troughing for the upcoming weekend and early next week with renewed chances for scattered showers.

Forecast Details: On Wednesday shortwave troughing will be gradually moving to the east as cyclonic flow around a broad low over eastern Quebec continues to drift to the northeast. This will translate to northwesterly flow at the surface and result in upslope showers through the day, especially before sunset. There will be the potential for some of this to fall as wet snow, especially across the highest terrain as 850 mb temperatures will generally range between -2C to -5C. Surface temperatures across the mountains will generally be above freezing though and given the strong May sun angle would expect very minor if any accumulation. Downslope of the mountains it will be rather breezy with gusts up to 25 mph possible. Instability and flow will then weaken on Wednesday night, which will reduce shower chances. It will be a cool night with overnight lows ranging from the 30s across the north to the 40s in southern New Hampshire.

Another weak disturbance will move through the region on Thursday but the combination of weaker flow both at the surface and aloft along with lower 1000-500 mb RH will likely only allow for isolated shower chances with the mountains once again having the greatest potential. Temperatures at 850 mb on Thursday will be well above freezing though as surface temperatures warm into the 60s areawide. As a result, only rain is expected. Friday will likely be the pick of the week as ridging moves through from the west and upslope flow weakens, thus reducing shower chances. High temperatures will range from the lower to middle 60s across the north to the middle 70s in southern New Hampshire under partly cloudy skies. This ridging will then quickly be replaced with additional shortwave troughing for the weekend through early next week. Cool 850 mb temperatures of between 2-4C will allow for steep low-level lapse rates as surface temperatures warm into the 60s. This will likely allow for enough instability to produce scattered shower activity with some isolated thunder also possible. Given forecasted weak wind shear and very low CAPE values, not expecting this to be widespread and therefore left it out of this forecast package. The pattern then becomes a little more uncertain early next week as broad shortwave troughing continues along with weak flow.

AVIATION /07Z TUESDAY THROUGH SATURDAY/. Short Term . VFR conditions expected at all terminals through tonight. HIE and AUG have an outside chance of seeing showers this afternoon and overnight . but confidence is low enough at this time to leave out any mention in the TAF. Westerly winds will gust to 15-20 kt this afternoon before diminishing this evening.

Long Term . Scattered showers on Wednesday will allow for MVFR conditions, especially across northern terminals such as KHIE/KLEB. Northwesterly winds may gust up to 20 kts on Wednesday for terminals downslope of the mountains. VFR conditions are expected on Friday as northwest flow weakens. More numerous showers are then likely for both Saturday and Sunday along with perhaps an isolated thunderstorm.

MARINE. Short Term . Seas will remain below 5 ft through the period. Westerly winds will increase tonight over the outer waters, eventually gusting to above 20 kt. A few gusts to 25 kt are possible, especially from Cape Elizabeth south, but the expected duration of an hour or two and being right on the borderline of the criteria does not warrant a SCA.

Long Term . Borderline SCA conditions are possible for the first half of Wednesday as northwesterly winds gust between 20-25 kts with seas of 2-4 feet. Weak high pressure will then keep winds and seas below SCA through early next week.

FIRE WEATHER. Elevated fire weather conditions are expected for portions of southern New Hampshire this afternoon with winds gusting to 20-25 mph and RH values dropping into the 25-30% range. In coordination with the NH Forest Service, we will issue a special weather statement later this morning to highlight these conditions.

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



SYNOPSIS . Tubbs/Watson NEAR TERM . Watson SHORT TERM . Watson LONG TERM . Tubbs AVIATION . Tubbs/Watson MARINE . Tubbs/Watson FIRE WEATHER . Watson


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CASM1 - 8418150 - Portland, ME 12 mi60 min 51°F 49°F
44007 - PORTLAND 12 NM Southeast of Portland,ME 18 mi44 min W 3.9 G 5.8 51°F 48°F1010.8 hPa44°F
44032 - Buoy E0104 - Central Maine Shelf 39 mi110 min S 7.8 G 9.7 47°F 46°F6 ft1010.5 hPa
WEXM1 - Wells Reserve, ME 39 mi54 min W 4.1 51°F 40°F
WELM1 - 8419317 - Wells, ME 41 mi60 min WNW 8.9 G 12 51°F 51°F1011.7 hPa
44030 - Buoy B0102 - Western Maine Shelf 45 mi110 min WNW 9.7 G 14 51°F 4 ft1010.6 hPa

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portland, Portland International Jetport, ME15 mi63 minWNW 810.00 miMostly Cloudy49°F45°F86%1011 hPa
Auburn-Lewiston, ME22 mi58 minW 610.00 miLight Rain49°F42°F77%1011.8 hPa
Wiscasset Airport, ME23 mi61 minW 310.00 miOvercast47°F47°F100%1011.6 hPa

Link to 5 minute data for KPWM

Wind History from PWM (wind in knots)
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Last 24hrCalmW5NW46N6E7S4S12S7S8S10S10
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S9S8S7S6S8S6CalmSW3NW3SW4NW10W8
1 day agoW6NW9NW9NW9
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2 days agoN6N10N10NE9NE7NE8NE7NE8E66SE5CalmS7SW6SW6S4SW6W5NW6W7W6W6W8W9

Tide / Current Tables for Chebeague Point, Great Chebeague Island, Maine
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Chebeague Point
Click for Map
Tue -- 05:19 AM EDT     Sunrise
Tue -- 05:23 AM EDT     Moonrise
Tue -- 05:45 AM EDT     0.18 feet Low Tide
Tue -- 12:02 PM EDT     8.94 feet High Tide
Tue -- 03:01 PM EDT     New Moon
Tue -- 05:50 PM EDT     1.04 feet Low Tide
Tue -- 07:55 PM EDT     Sunset
Tue -- 07:56 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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9.58.46.43.91.80.50.212.8578.48.98.46.94.82.71.41.11.73.45.57.69.1

Tide / Current Tables for Upper Hell Gate (Sasanoa River, Maine) Current
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Upper Hell Gate (Sasanoa River
Click for Map
Tue -- 01:10 AM EDT     0.91 knots Max Flood
Tue -- 04:02 AM EDT     -0.00 knots Slack
Tue -- 05:17 AM EDT     Sunrise
Tue -- 05:22 AM EDT     Moonrise
Tue -- 06:08 AM EDT     -0.80 knots Max Ebb
Tue -- 09:58 AM EDT     0.00 knots Slack
Tue -- 01:50 PM EDT     0.79 knots Max Flood
Tue -- 03:01 PM EDT     New Moon
Tue -- 04:24 PM EDT     -0.00 knots Slack
Tue -- 06:20 PM EDT     -0.71 knots Max Ebb
Tue -- 07:54 PM EDT     Sunset
Tue -- 07:55 PM EDT     Moonset
Tue -- 09:53 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.90.90.90.60-0.6-0.8-0.7-0.6-0.400.50.70.80.80.70.2-0.3-0.7-0.7-0.5-0.300.5

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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