Tuesday, January21, 2020
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Marine Weather and Tides
South Portland, 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 7:06AMSunset 4:38PM Tuesday January 21, 2020 3:43 AM EST (08:43 UTC) Moonrise 5:22AMMoonset 2:43PM Illumination 15% 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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ANZ153 Casco Bay- 318 Am Est Tue Jan 21 2020
Tonight..NW winds 10 to 15 kt, becoming 5 to 15 kt after midnight. Seas 1 foot or less. Light freezing spray.
Tue..N winds 5 to 10 kt, becoming W in the afternoon. Seas 1 foot or less. Light freezing spray in the morning.
Tue night..NW winds around 5 kt. Seas 1 foot or less.
Wed..NW winds around 5 kt, becoming sw in the afternoon. Seas 1 foot or less.
Wed night..W winds around 5 kt. Seas 1 foot or less.
Thu..W winds around 5 kt. Seas 1 foot or less.
Thu night..W winds around 5 kt, becoming N after midnight. Seas 1 foot or less.
Fri..N winds around 5 kt. Seas 2 to 3 ft.
Fri night..NE winds 5 to 10 kt. Seas 2 to 4 ft.
Sat..E winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Sat night..E winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of snow. Vsby 1 to 3 nm.
ANZ100 318 Am Est Tue Jan 21 2020
Synopsis for stonington me to merrimack river ma out to 25 nm.. High pressure will gradually build across the waters through midweek with relatively tranquil conditions expected. A weak cold front will cross the waters late in the week. Low pressure will pass near or south of the waters this weekend. &&


7 Day Forecast for Marine Location Near South Portland, ME
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location: 43.65, -70.3     debug


Area Discussion for - Gray/Portland, ME
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FXUS61 KGYX 210232 AAB AFDGYX

Area Forecast Discussion . UPDATED National Weather Service Gray ME 932 PM EST Mon Jan 20 2020

SYNOPSIS. Cold high pressure will build overhead for tonight and Tuesday providing fair but cold weather. The high will gradually move off to the east mid to late week allowing for a warm up. Low pressure may affect the region over the weekend.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/. 930 PM Update . Only a few minor changes to temperatures based on recent reports. Forecast looks on track for a cold and clear night with strong radiational cooling components.

6 PM Update . Clear and cold night in progress with high pressure building in overnight from the west. Still some light flow over the area but these will drop off as ridging shifts east and subsidence increases. Adjusted dew points based on latest near term guidance, which reflects readings from about 0 to -5F at 6 PM. Temperatures are overall on track but incorporated latest mesonet data which consistently brings temperatures crashing down to near zero along the coast and -8 to -15F across the north by morning.

Previous discussion . SFC high pressure will gradually settle over the region tonight allowing for clear skies and good conditions for radiational cooling. Most of the good radiators in the forecast area will likely find themselves below zero by sunrise. There's an outside chance that some stratocu could develop across northern NH as moisture lingering in the 1-3 kft layer may condense under the strengthening subsidence inversion. This could keep temps up somewhat in Coos County and some western ME mountain zones later tonight, but this looks like a rather low probability at this time. Temperatures should tank this evening wherever the winds go calm.

SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/. High pressure will remain over the forecast area on Tuesday providing another day of cold weather but with much less wind. Clouds should be on the increase during the afternoon as a short wave trough approaches from the northwest. Dry air in column should inhibit precipitation as the short wave passes through Tuesday evening. Skies clear at most locations overnight Tuesday night with cold temperatures expected once again.

LONG TERM /WEDNESDAY THROUGH MONDAY/. The ensemble and deterministic model solutions remain in decent agreement on the long wave pattern into the upcoming weekend. For the bulk of the forecast period a relatively low amplitude and progressive split flow will dominate. The biggest question remains handling of digging Pacific energy that moves onshore late Tuesday to become an upper low over the lower Mississippi Valley Friday evening. This upper low will move into the mid Atlantic region by Sunday . then off the New England coast by early Monday. Considerable model spread exists with the handling of the upper low track and timing as well as the developing surface storm system Deterministic GFS is most progressive. with ECMWF slowest while the CMC-Global is offering a solution somewhere in- between. Hopefully these timing/track issues will be resolved as Pacific energy is better sampled after entering the NOAM Radiosonde network For now. leaning on ECMWF ensemble which falls more in line with the deterministic CMC-Global with the potential weekend storm. Thermal profiles suggest this will be a snow event with any mixing with rain limited to coastal sections. Otherwise . it looks like a rather tranquil period with a warm front lifting across the area on Wednesday accompanied by clouds and perhaps a few snow showers across northern and mountain sections. A ridge of high pressure will be centered to our south for Thursday and Friday with fair dry weather and temperatures several degrees above average. A cold front drops south across the area late Friday as high pressure noses into the region from Quebec for Friday night into the day Saturday.

AVIATION /02Z TUESDAY THROUGH SATURDAY/. Short Term . Low probability of MVFR cigs tonight at KHIE otherwise VFR conditions for all terminals through Tuesday night with light winds.

Long Term . Wed . Sct MVFR psb in mtn -SHSN Sat PM. Areas of MVFR psb in -SN over sthrn NH.

MARINE. Short Term . Winds and seas will continue to diminish tonight right through Tuesday night with tranquil conditions expected.

Long Term . Fri PM - Sat . SCAs possible outside the bays.

HYDROLOGY. Multiple rivers continue to show evidence of ice movement. The Kennebec River at Augusta will near flood stage again overnight as the tide comes in. Have issued an FLS for these rises there due to ice for the next few hours. The Swift River at Roxbury and the Sugar River at Claremont also appear to have ice jams. Currently no impacts with these so will continue to monitor but very cold temperatures should preclude much if any ice movement.

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



NEAR TERM . Hanes SHORT TERM . Ekster LONG TERM . Schwibs


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CASM1 - 8418150 - Portland, ME 3 mi61 min 14°F 36°F
44007 - PORTLAND 12 NM Southeast of Portland,ME 12 mi53 min N 12 G 16 19°F 40°F2 ft1026.3 hPa (+1.2)5°F
WEXM1 - Wells Reserve, ME 25 mi103 min NW 2.9 9°F -2°F
WELM1 - 8419317 - Wells, ME 27 mi61 min NW 1.9 G 2.9 10°F 38°F1026.8 hPa
44030 - Buoy B0102 - Western Maine Shelf 33 mi99 min NW 16 G 19 1026.9 hPa
44073 45 mi159 min WNW 14 G 18 23°F 43°F

Wind History for Wells, ME
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portland, Portland International Jetport, ME1 mi52 minSW 310.00 miFair4°F-4°F69%1026.7 hPa

Link to 5 minute data for KPWM

Wind History from PWM (wind in knots)
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Last 24hrNW10NW9N11NW11NW9NW7NW11NW13NW10N12NW10NW9N8NW5N3CalmCalmW3W3SW5W4CalmW3SW3
1 day ago------------------------N6N6NW10NW7N11NW19
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NW9NW10NW9NW11
2 days ago------S3----W3--------------NW3N3W5----NW6N6------

Tide / Current Tables for Fore River, Maine
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Fore River
Click for Map
Tue -- 01:49 AM EST     0.53 feet Low Tide
Tue -- 04:22 AM EST     Moonrise
Tue -- 07:08 AM EST     Sunrise
Tue -- 08:10 AM EST     10.06 feet High Tide
Tue -- 01:42 PM EST     Moonset
Tue -- 02:38 PM EST     -0.37 feet Low Tide
Tue -- 04:36 PM EST     Sunset
Tue -- 08:53 PM EST     8.74 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.20.90.61.33.15.57.79.3109.78.15.83.21.1-0.1-0.30.72.7578.38.786.3

Tide / Current Tables for Cow Island, Maine
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Cow Island
Click for Map
Tue -- 01:47 AM EST     0.53 feet Low Tide
Tue -- 04:21 AM EST     Moonrise
Tue -- 07:07 AM EST     Sunrise
Tue -- 08:07 AM EST     10.06 feet High Tide
Tue -- 01:42 PM EST     Moonset
Tue -- 02:36 PM EST     -0.37 feet Low Tide
Tue -- 04:36 PM EST     Sunset
Tue -- 08:50 PM EST     8.74 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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2.10.90.61.43.25.67.89.4109.685.73.11.1-0.2-0.30.82.85.17.18.48.786.2

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 (3,6,7,8)
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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.