Marine Weather and Tides
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 5:22AM||Sunset 8:16PM||Friday July 21, 2017 6:41 PM EDT (22:41 UTC)||Moonrise 3:30AM||Moonset 6:38PM||Illumination 3%|
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|ANZ154 Coastal Waters From Cape Elizabeth, Me To Merrimack River, Ma Out 25 Nm- 250 Pm Edt Fri Jul 21 2017 |
Tonight..SW winds 5 to 10 kt, becoming nw after midnight. Seas around 2 ft.
Sat..SW winds 5 to 10 kt. Seas around 2 ft.
Sat night..SW winds 5 to 10 kt, becoming ne after midnight. Seas 2 to 3 ft.
Sun..E winds 5 to 10 kt. Seas 2 to 3 ft.
Sun night..E winds 5 to 10 kt. Seas around 2 ft. A chance of showers. Patchy fog after midnight with vsby 1 to 3 nm.
Mon..NE winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 4 ft. Patchy fog in the morning. Showers likely. Vsby 1 to 3 nm in the morning.
Mon night..NE winds around 10 kt. Seas around 3 ft. A chance of tstms. Showers likely, mainly in the evening. Some tstms may produce heavy rainfall.
Tue..NE winds around 10 kt with gusts up to 20 kt. Seas around 3 ft. A chance of showers.
Tue night..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Wed..NE winds 5 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
Wed night..SW winds around 5 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms.
|ANZ100 250 Pm Edt Fri Jul 21 2017 |
Synopsis for stonington me to merrimack river ma out to 25 nm.. A weak cold front will cross the gulf of maine tonight and Saturday. Low pressure is expected to track to the south of cape cod on Sunday with another area of low pressure tracking toward the region on Monday.
7 Day Forecast for Marine Location Near Newfields, NHHourly EDIT Help
Area Discussion for - Gray/Portland, ME  (on/off)  Help NOTE: mouseover dotted underlined text for definition
|Fxus61 kgyx 212218|
area forecast discussion
national weather service gray me
618 pm edt Fri jul 21 2017
A weak front drops south across the area tonight and Saturday
before stalling over southern new england. Several areas of low
pressure will track through southern new england along this
front late this weekend and into early next week, providing a
chance of rain while keeping temperatures cool.
Near term until 6 am Saturday morning
615 pm... Bets dynamics and thermodynamics staying N of the cwa,
and as convection drifts SE into the CWA it will weaken. Still
may see an isolated tsra or two along the intl border and into
central somerset county through about sunset. Otherwise look
for a mostly clear and warm evening, as westerly flow will be
slow to wind down, and decoupling will likely not happen to
Previously... NWS doppler radar mosaic shows scattered
convection has developed over quebec, northern maine, and into
new brunswick as surface heating... A series of weak
boundaries... And an approaching shortwave work in tandem.
Modified raobs show capes of 1000 to 1500 j kg with a few storms
across our far northern and eastern maine zones capable of
strong wind gusts and hail through early evening. Otherwise... A
dry night as a surface cold front settles southward into the
region. Lows will range from the upper 50s to mid 60s.
Short term 6 am Saturday morning through Saturday night
On Saturday... A blend of clouds and sunshine as the cold front
continues to settle south across the area. There could be an
isolated afternoon shower over the southern half of new hampshire
into adjacent southwest maine... Otherwise a dry and warm summer
day with highs ranging from 75 to 80 along the international
border to the 80s elsewhere. The front will continue to press
south Saturday night... With mostly clear skies from northern new
hampshire through central maine and partly cloudy skies for the
remainder of the area as high pressure noses in from eastern
canada. Lows will range from around 50 near the international
border with 50s to near 60 elsewhere.
Long term Sunday through Friday
On Sunday the large upper low over eastern canada and northern
maine will begin moving east as a short wave kicker approaches
in the mid level flow in the vicinity of the northern great
lakes. This short wave opens up as it digs south into new
england Monday and Tuesday. Ridging fills in briefly on
Wednesday before another stronger upper low follows a similar
path for the end of the work week. This active pattern looks to
continue keeping precipitation chances in the forecast.
As far as temperatures, the hot air is suppressed southward
with naefs showing negative temperature anomalies at 925mb
Monday through Wednesday. Highs only warm into the 60s and 70s
each day due to cloud cover and rain (this is several degrees
below normal for this time of year for pwm and con). Overnight
lows will generally be in the 50s with a few 60s creeping back
in (right around normal).
At the surface, a chain of weak low pressure centers develop
along a baroclinic zone that will be initially centered to our
south and west Sunday. Precipitation will spread from west to
east Sunday night into the Monday as the system shifts
northeast. This slow moving, vertically stacked system will have
high pwat air to work with (although it will be higher to the
south) as well as moderately deep warm cloud depths...
especially Monday night into Tuesday. Mean specific humidity
anomalies will be +2-3 standard deviations above normal
according to the naefs. Therefore heavy rain and localized
flooding will be a prime concern for the 48 hr period. Current
model timing for Sunday night into Monday's precipitation
(arriving after dark) would preclude any real severe weather
threats at this time.
Thunderstorms chances increase Monday into Tuesday morning
however as lapse rates increase, reaching around 7 c km Monday
night preceding the short wave passage. A cold front sweeps
through during this time and should help focus storms. Depending
on how much heating we get there may be marginally severe
storms with damaging wind and hail early on but again antecedent
cloud cover will be an issue.
Wednesday high pressure crosses the area. Another cold front
marches through Thursday night into Friday, but parent forcing
is so far forecasted to be well displaced in canada.
Aviation 22z Friday through Wednesday
Short term...VFR with isold MVFR in tsra psb vicinity of
international border through early evening. LCL ifr conditions
are psb Sat am and again Sun am in valley stratus and fog.
Long term... Cool and unsettled weather returns with showers and
MVFR ceilings being the norm for the daytime and ifr in fog
and stratus returning into the overnight from Sunday through
Tuesday as moisture pools along frontal boundaries. Llws may be
a concern Sunday with near calm winds at the surface and an
increasing LLJ near leb and hie.
Short term through Saturday night ... Winds and seas are
expected to remain below SCA threshold through the period.
Long term... Winds and seas remain below SCA criteria through the
end of the weekend and into next week. A frontal boundary
stalled over or near the waters will keep winds light and
stratus and dense fog over the waters.
Gyx watches warnings advisories
near term... Cempa schwibs
short term... Schwibs
long term... Hanes
marine... Hanes schwibs
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|
|BGXN3 - Great Bay Reserve, NH||4 mi||56 min||WSW 6||88°F||1008 hPa||63°F|
|IOSN3 - Isle of Shoals, NH||16 mi||41 min||S 13 G 14||78°F||1007.1 hPa (-1.0)||62°F|
|WELM1 - 8419317 - Wells, ME||26 mi||41 min||WSW 7 G 11||87°F||72°F||1007 hPa (-1.3)|
|44030 - Buoy B0102 - Western Maine Shelf||27 mi||97 min||S 12 G 14||73°F||70°F||1 ft||1007.5 hPa|
|WEXM1 - Wells Reserve, ME||28 mi||41 min||WSW 2.9||89°F||60°F|
|44029 - Buoy A0102 - Mass. Bay/Stellwagen||41 mi||97 min||S 7.8 G 9.7||73°F||65°F||1 ft||1007.5 hPa|
|44098 - Jeffrey's Ledge, NH (160)||43 mi||35 min||68°F||1 ft|
|BHBM3 - 8443970 - Boston, MA||49 mi||41 min||88°F||1007 hPa (-0.6)|
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||6 mi||43 min||WSW 5||10.00 mi||Partly Cloudy||88°F||60°F||39%||1007.2 hPa|
|Rochester - Skyhaven Airport, NH||16 mi||50 min||Var 6||10.00 mi||Fair||87°F||59°F||39%||1006.9 hPa|
Wind History from PSM (wind in knots)
|1 day ago||W||W||W||W||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||W||SW||SW||SW||NW||W||SW||SW||S||SE||E||SE|
|2 days ago||S||SE||SE||E||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||Calm||SE||E||SE||SE||SE||E||Calm|
EDIT RT Ports Option Weekend mode (on/off) (on/off)  Help One Week of Data
|Squamscott River RR. Bridge |
Click for Map
Fri -- 03:30 AM EDT Moonrise
Fri -- 05:23 AM EDT Sunrise
Fri -- 06:11 AM EDT -0.58 feet Low Tide
Fri -- 12:02 PM EDT 7.17 feet High Tide
Fri -- 06:22 PM EDT -0.12 feet Low Tide
Fri -- 06:38 PM EDT Moonset
Fri -- 08:16 PM EDT Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
EDIT (on/off)  Help One Week of Data
|Portsmouth Harbor Entrance |
Click for Map
Fri -- 01:51 AM EDT -2.23 knots Max Ebb
Fri -- 03:29 AM EDT Moonrise
Fri -- 05:22 AM EDT Sunrise
Fri -- 05:48 AM EDT 0.00 knots Slack
Fri -- 07:45 AM EDT 1.31 knots Max Flood
Fri -- 11:29 AM EDT -0.00 knots Slack
Fri -- 02:13 PM EDT -2.04 knots Max Ebb
Fri -- 05:56 PM EDT 0.00 knots Slack
Fri -- 06:37 PM EDT Moonset
Fri -- 08:08 PM EDT 1.65 knots Max Flood
Fri -- 08:15 PM EDT Sunset
Fri -- 11:56 PM EDT -0.00 knots Slack
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 (18,4,5,8)(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.