Marine Weather and Tides
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.
3/12/2015 - Added section for Gulf current for users in the GMZ marine zones.
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|Sunrise 6:32AM||Sunset 7:04PM||Sunday March 26, 2017 7:10 AM EDT (11:10 UTC)||Moonrise 5:56AM||Moonset 5:30PM||Illumination 1%|
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|ANZ154 Coastal Waters From Cape Elizabeth, Me To Merrimack River, Ma Out 25 Nm- 349 Am Edt Sun Mar 26 2017 |
Today..NE winds 10 to 15 kt with gusts up to 20 kt... Becoming E 5 to 10 kt this afternoon. Seas 2 to 3 ft.
Tonight..SE winds 5 to 10 kt...becoming 5 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. A chance of rain and sleet after midnight with vsby 1 to 3 nm.
Mon..SE winds 10 to 15 kt...becoming 5 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 4 to 6 ft. Rain. Vsby 1 to 3 nm in the afternoon.
Mon night..NW winds 5 to 10 kt. Seas 4 to 6 ft. Rain...mainly in the evening with vsby 1 to 3 nm.
Tue..N winds 5 to 10 kt...becoming ne in the afternoon. Seas 3 to 4 ft.
Tue night..E winds 5 to 10 kt...becoming ne after midnight. Seas 3 to 5 ft. A chance of showers.
Wed..N winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers.
Wed night..NW winds 10 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Thu..NW winds 10 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft.
Thu night..N winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft.
|ANZ100 349 Am Edt Sun Mar 26 2017 |
Synopsis for stonington me to merrimack river ma out to 25 nm.. High pressure shifts east toward nova scotia today with an easterly flow developing over the waters. Low pressure will track east through southern new england and into the gulf of maine on Monday. Another low will follow a similar track Tuesday night. High pressure then builds in out of the northwest through the end of the week.
7 Day Forecast for Marine Location Near York Harbor, MEHourly EDIT Help
Area Discussion for - Gray/Portland, ME  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kgyx 260839|
area forecast discussion
national weather service gray me
439 am edt Sun mar 26 2017
High pressure crosses the region today. A warm front will
approach from the southwest on Sunday before a weak wave of low
pressure forms and passes through the gulf of maine Monday. This
will provide a round of mixed wintry precipitation Sunday night
into Monday. Low pressure moves north of the region on Tuesday
and drags a cold front through on Wednesday. High pressure will
build in from canada for the end of the week.
Near term /today/
High pressure over western maine this morning is allowing some
cold and very dry air to filter down into the area. Dewpoints in
eastern maine are solidly subzero early this morning with
temperatures in the teens and single digits even into western
maine and northern new hampshire. As high pressure moves east
today, expect an easterly pressure gradient to develop which
will promote the damming of this cold, dry air up against the
mountains of new hampshire and western maine. After a cold
start, temperatures will rebound a bit due to a fair amount of
sun early in the day. But increasing clouds and continued cold
air damming should keep temperatures from rising out of the low
to mid 30s for most areas. The GFS model is the most aggressive
at developing a period of drizzle/freezing drizzle within the
easterly upslope area of new hampshire this afternoon, but this
seems a little overdone and is not supported by most models. The
gfs is also the coldest model perhaps in part due to the clouds
and light precipitation it develops.
Short term /tonight and Monday/
Wave of low pressure ejecting out of the middle mississippi
valley today will move toward our area tonight. Expect an
initial round of light precipitation, probably snow, to move
through the area during the evening as warm advection begins
aloft. More persistent precipitation will begin arriving later
in the night. At this point, temperatures aloft will be warming
to above freezing for at least part of the area, while low level
temperatures remain near or below freezing. This will cause
precipitation type to change to freezing rain over southern and
western parts of the area. Expect ice accumulations from just a
light glaze to as much as a quarter of an inch by morning across
central, southern, and western new hampshire.
Models are now indicating the development of a secondary surface
low over southern new england on Monday, tracking east into the
gulf of maine. This development will have the effect of keeping
the cold air locked in place across western maine and eastern
new hampshire. In fact, this cold air could be deep enough for
some sleet across interior western maine which will limit total
ice accumulations there a bit. As the low and parent trough move
east on Monday, expect precipitation to come to an end from west
to east during the afternoon or evening, possibly lingering a
little longer in the western maine mountains.
A mix of winter weather advisories and freezing rain advisories
have been issued for the area to draw attention to the expected
wintry conditions. The freezing rain will be the primary hazard
here considering its impact on travel. The advisories were
structured so that winter weather advisories were used for areas
which are expected to get an inch or more of sleet and snow in
addition to the freezing rain, while areas expected to get less
than an inch of snow and sleet were given a freezing rain
advisory to highlight the more significant hazard.
There is still a lot of uncertainty with regard to
precipitation type. It is late march after all, and this is not
a climatologically favored time for freezing rain, especially
during the day. However, it's also not that common to see such a
dry/cold air mass either. The model forecast easterly flow will
serve to pile up this cold air against the north-south mountain
ranges of new hampshire, locking the cold air in place and
allowing it to drain southward. The development of a secondary
surface low tracking to the south of the area serves to increase
confidence in the low level cold air damming, but also raises
the possibility that precipitation may fall as more snow/sleet
as deeper cold air is pulled in to the north of the low. This is
a particularly challenging forecast and it will be worth it for
users to monitor the forecast for updates and changes as the
Long term /Monday night through Saturday/
500 mb flow trends from weakly to more moderately amplified
during the extended range, and will be highly dependent on|
stream of closed lows moving to the western and southwestern
united states before lifting NE toward the great lakes and
northeast. These will ultimately determine how amplified flow
becomes and timing of troughing and ridging. Blocking over
europe should allow for deepening troughs to our east. The one
positive is that this will allow the coldest air to shift back
toward the pole, and while we may not see too much in above
normal temps, they will shift more toward normal thru the
Monday night remains tricky, mainly in the northeast where
temps may remain below freezing through the night with some
freezing rain expected, although mounts should be light. Could
also see some snow or sleet mix in at times, given some colder
air moving in aloft as the low intensifies a little over the
gulf of maine. Elsewhere precip may see a break late Monday
night as warm sector aloft moves in, but onshore flow may allow
some drizzle to persist on the coastal plain.
Tuesday will see another weak low shift south of the region, further
offshore than than the previous low. It will drag a cold front
across the region, which could produce another round of showers
Tuesday afternoon/evening. Could see some spots in southern nh
break out into the warm sector before this front comes thru, in
which case they may see temps 50 or higher. Once the front goes
thru Tuesday night, will see colder air aloft and some snow
showers will be possible. The front will wipe out the occlusion
and marine layer, so Wednesday will be warmer than Tuesday in
many spots with highs in the 40s to low 50s.
Thursday will be a little cooler than Wednesday, but coldest
air aloft will have moved through already. Temps warm up a
little bit more on Friday, with next system approaching Friday
night and bringing a chance for precip Friday night and Saturday.
May start as some wet snow in some places, but should be rain
during the day Saturday.
Aviation /08z Sunday through Thursday/
Short term... Conditions startVFR today with very light winds.
But expect increasing clouds from southwest to northeast as the
day GOES on, and by evening ceilings will begin lowering to
MVFR. Light snow changing to sleet and freezing rain from
southwest to northeast is expected tonight into the day Monday
with ifr conditions expected. There is still a great amount of
uncertainty on precipitation type, but freezing rain is possible
at all terminals for at least some time, possibly lingering
into the afternoon on Monday at augusta. Eventually temperatures
will warm above freezing and cause precipitation to change to
Long term... Ifr or lower Monday night and Tuesday with
ra/fg/dz. May see some improvement to MVFR during the day
Tuesday at kmht/kcon. Some improvement to MVFR everywhere
Tuesday night withVFR Wednesday-Thursday. May see NW wind
gusts to 25 kt at times on Wednesday.
Short term... Light winds and low seas are expected over the gulf
of maine as high pressure crosses the waters today. A southeast
flow will develop ahead of a developing surface low on Monday,
and this flow could bring some higher seas and possibly some
wind gusts to 25 kt late Monday.
Long term... Seas could reach 5-6 feet in swell from coastal lows
Monday night and Tuesday. Winds will reach SCA levels in nw
flow behind a cold front Wednesday, perhaps lasting into
Me... Winter weather advisory from 8 pm this evening to 5 pm edt
Monday for mez007>009-012>014-018>022.
Winter weather advisory from 8 pm this evening to 10 am edt
Monday for mez023>028.
Nh... Winter weather advisory from 8 pm this evening to 5 pm edt
Monday for nhz001>004-006-009-010.
Freezing rain advisory from 8 pm this evening to 10 am edt
Monday for nhz005-007-008-011>015.
Long term... Cempa
Weather Reporting StationsEDIT (on/off)  Help NOTE: Click on distance to see the station location on a map
|Stations||Dist||Age||Wind||Air Temp||Water Temp||Waves||Pressure||DewPt|
|IOSN3 - Isle of Shoals, NH||11 mi||70 min||NNE 17 G 18||34°F||1033.1 hPa (+2.0)||17°F|
|BGXN3 - Great Bay Reserve, NH||11 mi||85 min||Calm||22°F||1034 hPa||21°F|
|44030 - Buoy B0102 - Western Maine Shelf||12 mi||66 min||NE 16 G 19||35°F||39°F||3 ft||1033.2 hPa|
|WELM1 - 8419317 - Wells, ME||14 mi||40 min||N 6 G 7||27°F||37°F||1034.5 hPa|
|WEXM1 - Wells Reserve, ME||15 mi||70 min||NNW 5.1||27°F||12°F|
|44098 - Jeffrey's Ledge, NH (160)||34 mi||34 min||41°F||5 ft|
|44007 - PORTLAND 12 NM Southeast of Portland,ME||38 mi||80 min||NNE 18 G 21||33°F||38°F||2 ft||1033.1 hPa (+1.1)||16°F|
|CASM1 - 8418150 - Portland, ME||42 mi||40 min||30°F||36°F||1034.5 hPa|
|44029 - Buoy A0102 - Mass. Bay/Stellwagen||42 mi||66 min||NE 18 G 19||38°F||39°F||4 ft||1031.6 hPa|
Wind History for Wells, ME(wind in knots) EDIT (on/off)  Help
Airport ReportsEDIT (on/off)  Help Click EDIT to display multiple airports
|Pease Air Force Base / Portsmouth, NH||10 mi||72 min||NW 3||10.00 mi||A Few Clouds||24°F||18°F||82%||1033.5 hPa|
|Rochester - Skyhaven Airport, NH||18 mi||19 min||NNW 5||10.00 mi||Fair||23°F||12°F||65%||1033.6 hPa|
|Sanford, Sanford Regional Airport, ME||19 mi||14 min||N 0||10.00 mi||Fair||11°F||9°F||92%||1035.7 hPa|
Wind History from PSM (wind in knots)
|1 day ago||Calm||Calm||S||S||S|
|2 days ago||W||NW||NW|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Fort Point |
Click for Map
Sun -- 04:26 AM EDT 0.24 feet Low Tide
Sun -- 05:55 AM EDT Moonrise
Sun -- 06:34 AM EDT Sunrise
Sun -- 10:25 AM EDT 9.45 feet High Tide
Sun -- 04:53 PM EDT -0.32 feet Low Tide
Sun -- 05:30 PM EDT Moonset
Sun -- 07:02 PM EDT Sunset
Sun -- 10:52 PM EDT 9.31 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Portsmouth Harbor Entrance |
Click for Map
Sun -- 12:02 AM EDT -0.00 knots Slack
Sun -- 02:43 AM EDT -1.85 knots Max Ebb
Sun -- 05:55 AM EDT Moonrise
Sun -- 06:33 AM EDT 0.00 knots Slack
Sun -- 06:35 AM EDT Sunrise
Sun -- 08:33 AM EDT 1.30 knots Max Flood
Sun -- 12:16 PM EDT -0.00 knots Slack
Sun -- 03:06 PM EDT -2.08 knots Max Ebb
Sun -- 05:30 PM EDT Moonset
Sun -- 06:59 PM EDT 0.00 knots Slack
Sun -- 07:02 PM EDT Sunset
Sun -- 09:00 PM EDT 1.41 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Weather Map and Satellite Images(on/off)  Help
|Weather Map ||IR Satellite Image from GEOS|
GOES Local Image of Northeast EDIT
Wind Forecast for Gray/Portland, ME (7,2,3,4)(on/off)  Help
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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.