Wednesday, July26, 2017 L-36.com


Marine Weather and Tides
South Portland, ME

Version 3.4
What's New / NOTES
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported.
5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive.
5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds.

Sunrise 5:23AMSunset 8:11PM Wednesday July 26, 2017 12:46 AM EDT (04:46 UTC) Moonrise 9:04AMMoonset 10:17PM Illumination 7% Phase: Waxing Crescent; Moon at 3 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- 647 Pm Edt Tue Jul 25 2017
Rest of tonight..NW winds 5 to 10 kt. Seas 2 to 3 ft, subsiding to 1 to 2 ft.
Wed..NW winds around 5 kt, becoming S in the afternoon. Seas 1 to 2 ft.
Wed night..S winds 5 to 10 kt. Seas 1 to 2 ft.
Thu..S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers in the afternoon.
Thu night..SW winds 5 to 10 kt with gusts up to 20 kt, becoming W after midnight. Seas 2 to 3 ft. A chance of showers.
Fri..NW winds around 5 kt, becoming se in the afternoon. Seas 1 to 2 ft. A chance of showers.
Fri night..N winds 5 to 10 kt. Seas 1 foot or less.
Sat..N winds 5 to 10 kt. Seas 1 foot or less.
Sat night..NW winds around 5 kt. Seas 1 to 2 ft.
Sun..W winds around 5 kt. Seas 1 to 2 ft.
Sun night..W winds around 5 kt. Seas 1 to 2 ft.
ANZ100 647 Pm Edt Tue Jul 25 2017
Synopsis for stonington me to merrimack river ma out to 25 nm.. High pressure remains in control of the waters through Wednesday. Southerly flow will develop late Wednesday as high pressure drifts eastward. A cold front and associated showers and Thunderstorms will approach the waters Thursday and Friday.

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 260221
afdgyx
area forecast discussion
national weather service gray me
1021 pm edt Tue jul 25 2017

Synopsis
High pressure will continue to build into the region tonight and
will bring drier weather and clearing skies. It will shift
offshore on Wednesday... Allowing some warmer air back into the
region. A cold front pushes toward the area on Thursday. High
pressure will attempt to build into the region Friday and
Saturday as low pressure forms south of new england.

Near term tonight
1015pm update...

have updated the forecast to adjust hourly temperature and
dewpoint forecasts toward latest observed values. Already seeing
many automated observing sites with temperatures at their
dewpoints, so each additional degree of cooling from here on out
will contribute to deposition (dew) and condensation (fog).

Still think the most likely fog areas will be the valleys, with
temperatures broadly on track to reach forecast lows. No
significant changes were needed.

7pm update...

have updated the forecast based on latest observations and
expected conditions overnight. High pressure nestling down into
our area tonight will bring calm winds with sky cover
increasingly becoming clear. This has already been observed in
the late afternoon visible satellite as earlier cloud cover
over new hampshire is rapidly dispersing. This will set the
stage for an excellent radiational cooling night, with low
temperatures reaching a base of about 50 degrees, with typical
cold spots in valleys getting significantly colder, and urban
warm spots staying slightly warmer. Expect a good deal of
radiation fog to develop overnight, with much of this
accumulating in the valley locations, becoming dense in the
sharper valleys by daybreak. Given the spotty and localized
nature of the dense fog, will not issue a dense fog advisory,
however, we do expect many valley locations to have very low
visibility by morning.

Original discussion...

clouds will continue to dissipate as drier air builds into the
region from the northeast. High pressure will continue to allow
for clearing during the overnight period with southwestern new
hampshire being the last to clear.

With high pressure overhead and light winds, some radiational
cooling will take hold. Overnight low temperatures will drop
into the 40s in many areas. As temperatures fall towards the
dew points, patchy fog will form. Inland valleys will have the
lowest visibilities.

Short term Wednesday and Wednesday night
Patchy fog will gradually mix out Wednesday morning across
maine and new hampshire. There will be ample sunshine when
compared to today. With modest warming aloft, surface
temperatures will climb through the 70s with many communities
topping out at 80 degrees away from the shoreline. As usual, the
midcoast region will be the coolest location as a weak gradient
will allow for onshore sea breezes to form.

A cold front will approach from the west Wednesday night. A
southwest gradient will develop, allowing for a breeze to
develop late at night. Increasing cloud cover may prevent as
much fog compared to what is expected tonight.

Long term Thursday through Tuesday
The extended forecast will be characterized by large scale
troughing over the eastern CONUS which will move southeast from
northern canada Thursday into Friday. The system will then stall
over the region due to downstream blocking through at least the
weekend. Several spokes of short wave energy rotating around the
upper low as well as a significant southern stream short wave
will bring clouds and at least one shot of showers and
thunderstorms to northern new england.

Pacific na teleconnection has recently been in a negative phase
corresponding to negative temperature anomalies at both 500mb
and and the surface. The good news is temperatures will be just
a few degrees above normal for highs Thursday and Friday with a
warming trend thereafter.

The main concern for the Thursday through early next week time
frame will be the short wave and surface boundary affecting the
region Thursday. The boundary should enter the northern zones
Thursday morning triggering numerous showers and thunderstorms.

This airmass does not look particularly moist so not expecting
any particular hydro issues with this boundary, but localized
heavy rain is possible. The front should clear the coast late
Thursday night.

Instability will be mostly concentrated in southern nh where we
may get more SBCAPE depending on antecedent clouds and showers.

Have included thunderstorms but not any particular enhanced
wording at this time. It is noted a portion of nh is under a
marginal risk of thunderstorms while the remainder of the area
is in general thunder per spc. Baroclinic zone will shift south
on Friday as secondary cyclogenesis occurs over the mid atlantic
region. Some rain showers could brush southern sections early
but dense canadian high pressure building in from the northwest
will suppress precipitation quickly during the day.

Sunday through early next week look tranquil with a weak system
possible for Tuesday Wednesday.

Aviation 00z Wednesday through Sunday
Short term... Patchy fog tonight, mainly across the inland
valleys. A few locations will drop all the way down to lifr
conditions, namely leb and possibly hie and con. Conditions
improving shortly after sunrise on Wednesday.

Long term... Areas of MVFR conditions are possible at all
terminals in areas of heavy rain tsra Thursday into early
Friday morning. BecomingVFR Friday midday into Saturday.

Marine
Short term... Winds becoming calm overnight as high pressure
builds in. Wave heights will continue to diminish as well.

Long term... Seas and winds remain below small craft advisory
levels Wednesday through the extended. Heavy rain fog poor
visibilities are likely over the waters Thursday into Saturday.

Gyx watches warnings advisories
Me... None.

Nh... None.

Marine... None.

Near term update... Kimble
short term... Cannon
long term... Hanes


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CASM1 - 8418150 - Portland, ME 3 mi47 min 65°F 59°F1022.2 hPa (+0.5)
44007 - PORTLAND 12 NM Southeast of Portland,ME 12 mi57 min WSW 12 G 14 62°F 64°F4 ft1021.8 hPa (+0.0)56°F
WEXM1 - Wells Reserve, ME 25 mi47 min WSW 1.9 58°F 56°F
WELM1 - 8419317 - Wells, ME 27 mi47 min W 6 G 8 60°F 64°F1022.5 hPa (+0.3)
44030 - Buoy B0102 - Western Maine Shelf 33 mi103 min WSW 12 G 14 64°F 65°F4 ft1022.3 hPa

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Portland, Portland International Jetport, ME1 mi56 minN 010.00 miFair58°F55°F90%1022.5 hPa

Wind History from PWM (wind in knots)
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Last 24hrN8N7555N66N6NE8N9NE9NE10E7
G17
5CalmS4SE8S7S5SW6SW5SW5SW3Calm
1 day agoSE3CalmCalmCalmCalm5E7E9SE7SE6SE11--E8NE11NE8N8NE8NE9E13
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2 days agoN8NE6NE12NE9NE7NE8NE9NE8NE10NE9SE6E6SE8S7S8S8S8SW8S7S4S3SW3W3Calm

Tide / Current Tables for Fore River, Maine
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Fore River
Click for Map
Wed -- 01:41 AM EDT     11.22 feet High Tide
Wed -- 05:24 AM EDT     Sunrise
Wed -- 08:01 AM EDT     -1.23 feet Low Tide
Wed -- 09:03 AM EDT     Moonrise
Wed -- 02:18 PM EDT     10.28 feet High Tide
Wed -- 08:10 PM EDT     Sunset
Wed -- 08:19 PM EDT     -0.27 feet Low Tide
Wed -- 10:17 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
9.410.911.2107.74.51.6-0.5-1.2-0.61.44.37.19.210.2108.45.93.10.9-0.201.64.1

Tide / Current Tables for Cow Island, Maine
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Cow Island
Click for Map
Wed -- 01:38 AM EDT     11.22 feet High Tide
Wed -- 05:23 AM EDT     Sunrise
Wed -- 07:59 AM EDT     -1.23 feet Low Tide
Wed -- 09:03 AM EDT     Moonrise
Wed -- 02:15 PM EDT     10.28 feet High Tide
Wed -- 08:10 PM EDT     Sunset
Wed -- 08:17 PM EDT     -0.27 feet Low Tide
Wed -- 10:17 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
9.510.911.1107.54.41.5-0.5-1.2-0.51.54.47.29.310.29.98.35.830.8-0.20.11.74.2

Weather Map and Satellite Images
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Weather Map
wmap_A
IR Satellite Image from GEOS
east_satellite

GOES Local Image of Northeast    EDIT
Geos

Wind Forecast for Gray/Portland, ME (0,6,7,8)
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Ground Weather Radar Station Portland, ME
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weather_mapweather_map weather_map

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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 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.