Thursday, April26, 2018 L-36.com


Marine Weather and Tides
South Portland, ME

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:38AMSunset 7:39PM Thursday April 26, 2018 2:00 AM EDT (06:00 UTC) Moonrise 4:01PMMoonset 4:19AM Illumination 83% Phase: Waxing Gibbous; Moon at 11 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- 1043 Pm Edt Wed Apr 25 2018
.small craft advisory in effect until 8 am edt Thursday...
Overnight..E winds 15 to 25 kt, diminishing to 5 to 15 kt. Seas 4 to 6 ft. Rain with isolated tstms. Areas of fog. Vsby 1 to 3 nm.
Thu..SW winds 5 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Areas of fog in the morning. Rain in the morning, then a chance of showers in the afternoon. Vsby 1 to 3 nm in the morning.
Thu night..W winds 10 to 15 kt with gusts up to 20 kt, becoming sw 5 to 10 kt after midnight. Seas 3 to 5 ft.
Fri..SW winds 5 to 10 kt, becoming S in the afternoon. Seas 2 to 4 ft. A chance of showers in the afternoon.
Fri night..SE winds 5 to 10 kt. Seas 3 to 5 ft. Showers likely.
Sat..S winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers in the morning.
Sat night..SW winds 5 to 10 kt, becoming W after midnight. Seas 2 to 4 ft.
Sun..W winds 5 to 10 kt. Seas 2 to 4 ft.
Sun night..NW winds around 10 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Mon..W winds around 10 kt. Seas around 2 ft.
Mon night..W winds 5 to 10 kt. Seas 1 to 2 ft. Winds and seas higher in and near tstms.
ANZ100 1043 Pm Edt Wed Apr 25 2018
Synopsis for stonington me to merrimack river ma out to 25 nm.. Low pressure moves north toward new england today. As the low moves through northern new england on Thursday it will send a cold front eastward across the gulf of maine with high pressure building behind it through Friday morning. The next low may track up the east coast and toward the gulf of maine as early as Friday night with a stronger cold front arriving on Saturday.

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 260245
afdgyx
area forecast discussion
national weather service gray me
1045 pm edt Wed apr 25 2018

Synopsis
Low pressure over the mid atlantic coast will move north through
the area overnight and early Thursday with a good soaking rain.

This system will slowly exit the region late Thursday allowing
clearing Thursday night into early Friday. Another area of low
pressure will move into the region late Fri and Friday night.

Some instability showers are possibly mainly in the afternoon
and evening Saturday. A cold front with cooler drier air arrives
on Sunday. A warming trend is expected to begin early next
week.

Near term until 6 am Thursday morning
1045 pm update... Based on the more showery appearance of echoes
across southern new england, isolated strikes in western ma, and
modeled weak elevated instability developing overnight, have
added isolated thunder to southern zones for the overnight
hours. No changes otherwise.

10 pm update... Rain continues to push northward across the
forecast area at this time. It will taper off from south to
north over the next couple of hours leaving light rain showers,
drizzle and fog for a couple of hours. Thereafter another
resurgence of heavier rain should take place as a short wave
trough approaches from the west. This activity will continue
into or through the morning hours Thursday. As such, the flood
watches remain up for the mountains and foothills. In addition,
a rumble or two of thunder will be possible tonight into
Thursday morning as mid level lapse rates steepen with the
approach of the upper low.

6 pm update... Have updated pops and winds a little bit based on
latest observations as well as mesoscale model output. Heaviest
slug of rain is moving into southern zones now, and should
mainly be north and east of the forecast area around or just
after midnight (except for the mid coast of maine). Fog and
drizzle should end up filling in behind this slug of rain and
last through the overnight. As the main short wave trough
impinges on the area early Thursday morning, showery
precipitation should develop and sweep across the forecast area,
as the air mass becomes weakly unstable. Cannot rule out
isolated thunder at that time.

Previously...

most of the precip with this event will fall through this
evening as decent slug of rain, currently congealing over SE ma,
will move nne across areas along and just inland of the coast.

This is in response to tightening WAA at mid-lvls, which is also
developing a low level jet in the region. Models are in some
agreement that some places near the coast could see close to an
inch of rain or so between 22-06z or so. So, the +ra wording was
put into the forecast for the evening. Could see some localized
areas of urban and poor drainage flooding, but overall not
anticipating anything significant. The surge of decent se
upslope flow overnight, will also produce enhanced amounts in
these areas of the mtns, and this will drain into some rivers
and tributaries that are already running high due to snowmelt,
so, the flood watch will be held as it is. The rain will lighten
up some after midnight, but should continue thru most of the
night before it tapers off to showers anywhere but maybe SRN nh.

Temps will fall off a little bit tonight, but lows will mostly
be in the mid to upper 40s.

Short term 6 am Thursday morning through Thursday night
Could see another surge of steady rain move across ERN zones thu
morning, but other areas will be more showery, although clouds
and fog will linger through at least the first part of the
morning, until winds shift to the west. Should see showers end
around midday in SRN nh and far SW me, but clouds will linger
through a good part of the day, with some breaks of Sun late.

Most everywhere else will see a chance of showers thru the
afternoon, with mainly cloudy skies. Highs will generally be in
the mid to upper 50s in the mtns and eastern zones, where
clouds and rain will hang around longer, to 60-65 in SW me and
srn nh, where it will be drier, with a greater chance of some
sun, and downslope W flow.

Should see showers ending early Thu evening everywhere with clearing
overnight. Winds will diminish a bit and allow temps to cool,
with lows upper 30s to mid 40s.

Long term Friday through Wednesday
Models indicate another short wave trof moving across the
southern jet stream will lift northeast to the mid atlantic
region Fri forming another area of low pres along the mid
atlantic coast that will move north into the area with a similar
track as its predecessor. This will mean another round of rain
or showers will overspread the area late Fri through Fri night.

Qpf amounts may be in the 1 2-1 inch range. The system will be a
fast mover and move into the maritimes by Sat with a dry slot
of air to arrive for Sat with a cyclonic flow aloft remaining.

The combination of some heating on Sat with the cyclonic flow
aloft may allow some scattered afternoon showers to develop. On
Sunday the cold trof aloft over the great lakes progresses east
and allows a cooler northwest flow to develop Sunday with more
instability showers expected due to steepening lapse rates with
any daytime surface heating. Winds may become gusty due to the
strong northwest winds aloft mixing down to the surface. Temps
will be cool through Sunday.

Early next week a progressive large upper ridge will build east
and become further amplified by Wed with a much warmer southwest
flow to develop with dry conditions. Bottom line is a major
warm up is looking like a reality beginning early next week and
continuing through at least mid week. With a broad west to
southwest flow expected tue-wed, guidance temps will likely be
forecast too low for days 6-7. For now stayed close to guidance
temps to match surrounding forecast areas.

Aviation 03z Thursday through Monday
Short term... Conds will drop to ifr or lower everywhere this
evening and stay there into early thu. Some improvement toVFR
possible by afternoon at kcon kmht kpsm kpwm, with MVFR
lingering thru the afternoon elsewhere.VFR expected everywhere
thu night.

Long term...VFR early Fri with conditions lowering to MVFR ifr
late Fri into Sat in rain showers.VFR conditions return Sunday
with gusty NW winds in the afternoon.

Marine
Short term... SCA up for both winds and seas tonight, as SE winds
gust to 30 kts or so. Seas stay up Thu into Thu night, although
winds will shift to W and diminish, so will likely need to
convert SCA to haz seas versions during the day thu, and extend
it thru at least Thu night.

Long term... Seas over the outer waters will remain AOA 5 ft f
fri into Sat so sca's for seas will likely be needed even
though winds will remain light for that time frame. On Sun winds
shift to westerly and continue into early next week and should
remain generally below SCA conditions.

Hydrology
Expect continued snow melt to combine with about
an inch or so of rainfall to bring further rises to all rivers,
but especially the headwaters that drain eastward out of the
mountains toward the atlantic. These are the areas most likely
to see minor flooding, and some locations are currently forecast
by the RFC to reach minor flooding. Because of this, we have
kept a flood watch going covering the most likely impacted
areas, including the upper saco river as well as tributaries of
the androscoggin river. Flooding cannot be ruled out on the
upper pemigewasset river as well as along the kennebec.

Gyx watches warnings advisories
Me... Flood watch through Thursday afternoon for mez007>009-012>014-
021.

Nh... Flood watch through Thursday afternoon for nhz001>006.

Marine... Small craft advisory until 8 am edt Thursday for anz151-153.

Small craft advisory until 8 pm edt Thursday for anz150-152-
154.

Near term update... Ekster


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CASM1 - 8418150 - Portland, ME 3 mi42 min 48°F 43°F1005.4 hPa
44007 - PORTLAND 12 NM Southeast of Portland,ME 12 mi70 min SSE 7.8 G 9.7 46°F 42°F6 ft1005.4 hPa (-2.8)46°F
WEXM1 - Wells Reserve, ME 25 mi60 min NE 1.9 46°F 46°F
WELM1 - 8419317 - Wells, ME 27 mi42 min ENE 1.9 G 2.9 46°F 45°F1004.9 hPa
44030 - Buoy B0102 - Western Maine Shelf 33 mi116 min SE 12 G 16 45°F 43°F6 ft1004.5 hPa

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 mi69 minno data4.00 miLight Rain Fog/Mist48°F48°F100%1006 hPa

Wind History from PWM (wind in knots)
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Last 24hrS4CalmCalmS4S3SE3SE5SE6SE4S10
G17
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1 day agoCalmSW4S5S6SW5S6SW6S6S8S11
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2 days agoCalmW3W4W5W65NW636NW7S14
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S11S10S6S53CalmSW4

Tide / Current Tables for Fore River, Maine
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Fore River
Click for Map
Thu -- 02:49 AM EDT     0.35 feet Low Tide
Thu -- 04:18 AM EDT     Moonset
Thu -- 05:40 AM EDT     Sunrise
Thu -- 09:05 AM EDT     9.88 feet High Tide
Thu -- 03:20 PM EDT     -0.17 feet Low Tide
Thu -- 04:00 PM EDT     Moonrise
Thu -- 07:37 PM EDT     Sunset
Thu -- 09:39 PM EDT     9.97 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.32.10.70.41.235.57.79.39.99.47.85.32.80.9-0.10.11.53.96.48.59.79.98.8

Tide / Current Tables for Cow Island, Maine
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Cow Island
Click for Map
Thu -- 02:47 AM EDT     0.35 feet Low Tide
Thu -- 04:18 AM EDT     Moonset
Thu -- 05:40 AM EDT     Sunrise
Thu -- 09:02 AM EDT     9.88 feet High Tide
Thu -- 03:18 PM EDT     -0.17 feet Low Tide
Thu -- 04:00 PM EDT     Moonrise
Thu -- 07:37 PM EDT     Sunset
Thu -- 09:36 PM EDT     9.97 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.22.10.70.41.23.15.67.89.39.99.37.75.22.70.8-0.10.11.646.58.59.89.98.8

Weather Map and Satellite Images
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wmap_A
GOES 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.
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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Gray/Portland, ME (2,6,7,8)
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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 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.