Sunday, September24, 2017 L-36.com


Marine Weather and Tides
Groton, MA

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 6:36AMSunset 6:41PM Sunday September 24, 2017 10:28 PM EDT (02:28 UTC) Moonrise 10:53AMMoonset 9:24PM Illumination 20% Phase: Waxing Crescent; Moon at 4 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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ANZ230 Boston Harbor- 1014 Pm Edt Sun Sep 24 2017
Overnight..S winds around 5 kt. Waves 1 foot or less.
Mon..SE winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less. Patchy fog. Vsby 1 nm or less.
Mon night..S winds around 5 kt. Waves 1 foot or less. Patchy fog. Vsby 1 nm or less.
Tue..SE winds around 5 kt. Waves 1 foot or less. Patchy fog. Vsby 1 nm or less.
Tue night..S winds around 5 kt. Waves 1 foot or less. Patchy fog. Vsby 1 to 3 nm.
Wed..SE winds around 5 kt. Waves 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Wed night..S winds around 5 kt. Waves 1 foot or less. A chance of showers.
Thu..W winds around 5 kt. Waves 1 foot or less.
Thu night..N winds 5 to 10 kt. Waves 1 foot or less.
Fri..N winds 5 to 10 kt. Waves 1 foot or less.
Fri night..N winds 5 to 10 kt. Waves 1 foot or less. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.
ANZ200 1014 Pm Edt Sun Sep 24 2017
Synopsis for massachusetts and rhode island coastal waters.. High pressure over the eastern usa will bring light wind and dry weather to the waters through Tuesday. Southerly swell from hurricane maria will continue to move north into the waters and linger for much of the week. A cold front from canada will cross the waters later Wednesday or early Thursday. Mariners should Monitor the latest forecasts from the national hurricane center at www.nhc.noaa.gov. For information on possible hazardous weather beyond the 24-36 hour forecast period, please visit www.weather.gov/boston and follow the current hazards link above the map on the left.

7 Day Forecast for Marine Location Near Groton, MA
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location: 42.6, -71.63     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 250212
afdbox
area forecast discussion
national weather service taunton ma
1012 pm edt Sun sep 24 2017

Synopsis
High pressure covering much of the eastern usa will bring warm and
dry weather to southern new england the first part of this week.

Cold front approaches southern new england during Wednesday
afternoon and triggers scattered showers. Cold front slowly moves
through southern new england on Thursday and offshore Thursday
night. Maria will bring swells to the south coast, but the center is
expected to pass well southeast of new england late this week.

Near term until 6 am Monday morning
As per observations and goes16 fog product, fog and stratus are
advecting onshore across CAPE cod vineyard nantucket. There
have been a couple of reports of 1 4 mile vsbys, but most spots
show 2-4 miles at most. There is still a reasonable chance of
widespread dense fog developing by midnight, but not enough to
go to an advisory at this time. We will continue to monitor.

Fog product also shows increasing fog potential all along the
eastern mass waters with light east to southeast winds in place
to move any fog onshore. With this as well, no observed fog
reports at this time.

Patchy light fog also showing up in a couple of traditional fog
spots, due to radiation fog.

To sum up... Fog forecast remains likely and the forecast will
continue in this direction with both advection and radiation fog
in play.

Otherwise, high pressure brings clear skies and light wind. Fari
dry weather overnight with min temps mainly in the low to mid
60s.

Short term 6 am Monday morning through Monday night
Monday...

strong subtropical ridge remains in control across new eng with
sunshine and unseasonably warm conditions. However, stratus may
linger through the morning across CAPE islands. Similar
850 925 mb temps suggest temps close to today with upper 80s to
around 90 interior but cooler along the immediate coast where
sea breezes are likely.

Monday night...

as maria lifts north across SE us waters, higher pwat air and
ki values will approach sne from the east along with increasing
elevated instability. This will lead to a risk of showers across
se new eng and have chc pops for CAPE islands. Otherwise, the
guidance is indicating stratus and fog may be more expansive
across sne as higher dewpoints move in. Low temps will be in the
60s.

Long term Tuesday through Sunday
Highlights...

* very warm temperatures persist into Wednesday
* scattered showers Wednesday afternoon through Thursday night
* maria will bring swells to the south coast but will sharply
recurve out to sea southeast of new england late in the week
a weakening high pressure ridge should linger across southern
new england Tuesday into the first part of Wednesday. Light flow
will likely mean seabreezes, with lower temperatures along the
immediate coast.

A surface cold front should cross our region Wednesday night
into Thursday. Given the summer-like warmth ahead of this
front, some isolated thunderstorms are not out of the question.

The increasing southwest flow ahead of this cold front might
also be strong enough to tap into some tropical moisture from
maria. If this moisture is available, it could lead to locally
heavy downpours. Some question as to how quickly this cold front
will move offshore, particularly once it reaches the coastal
plain of ri and southeast ma.

High pressure should build in from the west Friday into
Saturday. Besides a chance of some lingering showers Friday
morning across the CAPE and islands, much of this period will be
dry. It will also be noticeably cooler, with below normal
temperatures expected.

Aviation 02z Monday through Friday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Monday night ...

tonight... Fog and low clouds will linger through the night.

Most likely on CAPE cod and islands, and may spread to parts of
bristol and plymouth counties. Areas of 1 4 mile vsbys or less
expected.VFR elsewhere with patchy fog in the traditional fog
spots.

Monday... High confidence.VFR, but areas of ifr stratus and
patchy fog may linger over CAPE and islands into the afternoon.

Uncertain timing of improving conditions over the CAPE and
islands.

Monday night. Moderate confidence. Ifr stratus and patchy fog
may become more expansive across sne but areal extent
uncertain.

Kbos taf... High confidence. Seabreeze redevelops by 16z mon.

Kbdl taf... High confidence in taf.

Outlook Tuesday through Friday ...

confidence... High.

Tuesday... MostlyVFR except for patchy early morning fog.

Wednesday... MostlyVFR but scattered MVFR ceilings visibilities
in showers, main during the afternoon.

Wednesday night through Thursday... MVFR ceilings and areas of
ifr ceilings and visibilities in scattered showers and fog.

Friday... MainlyVFR. Lingering MVFR in scattered showers across
the CAPE and islands in the morning.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Monday night ... High confidence.

Winds will remain light through Mon night with high pressure
over the waters. However, increasing long period south swell
from hurricane maria will be moving into the waters with
potential for 7 to 8 ft seas over southern waters Mon min night.

Sca for seas will continue. In addition, areas of fog will
result in poor vsbys at times, especially south and east of cape
cod.

Outlook Tuesday through Friday ... Confidence... High
relatively light winds are expected through this period. However,
swells from maria will propagate into the southern coastal waters,
beginning late Sunday night or Monday. Small craft advisories will
likely need to be extended due to rough seas for the waters south of
the ma and ri coast for all of this period.

The swells from maria will likely produce another round of high surf
and dangerous rip currents.

Outlook... Monday night through Friday
confidence... High
relatively light winds are expected through Friday. However,
swells from maria will impact the south coastal marine zones,
and small craft advisories will likely be needed due to rough
seas for much of this week.

The swells from maria will likely produce continuing high surf and
dangerous rip currents, probably lasting most of this week.

Tides coastal flooding
Long period swell from hurricane maria will be moving north
into the south coastal waters. Wnawave guidance indicating
increasing swell to 7-8 ft with a period of 15 seconds moving
into the south coastal waters Mon into Mon night and up to 9 ft
on Tuesday. This will result in increasing high surf and
dangerous rip currents. High surf advisory will continue and
will extend through tue, and it is likely the high surf will
continue through the week even as maria likely recurves out to
sea well southeast of new england.

Climate
Record high today was broken at bdl with a temp of 92 degrees.

Record high today was broken at orh with a temp of 86 degrees.

Two of four climate sites broke MAX temp records today. Another
chance for record high temps Monday, when records are 85-90.

Records jump up Tuesday to 89-95, while less mixing will lead to
lower MAX temps. So the chance for new records diminishes
Tuesday. The current record MAX temps for the three
days... Today, Monday, Tuesday... Are:
bos 90 1959 89 1926 95 1881
orh 85 2010 85 1970 91 1930
bdl 89 1959 90 2007 93 2007
pvd 87 1959 89 1920 89 2007
also, dew points in the 60s, while high for this time of year,
are not unprecedented. The daily extreme high values for dew
points are still in the low 70s, except for a couple of 68 and
69 values at worcester.

Box watches warnings advisories
Ct... None.

Ma... High surf advisory until 6 pm edt Tuesday for maz020-022>024.

Ri... High surf advisory until 6 pm edt Tuesday for riz006>008.

Marine... Small craft advisory for hazardous seas until 6 pm edt Tuesday
for anz235-237-254>256.

Synopsis... Belk kjc
near term... Wtb belk kjc
short term... Kjc
long term... Belk
aviation... Wtb belk kjc
marine... Wtb belk kjc
tides coastal flooding...

climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 35 mi40 min 76°F 1016.2 hPa
BGXN3 - Great Bay Reserve, NH 53 mi103 min ENE 1.9 65°F 1017 hPa65°F
44013 - BOSTON 16 NM East of Boston, MA 55 mi38 min SSE 5.8 G 7.8 65°F 64°F2 ft1017.1 hPa (+0.8)

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Fitchburg, Fitchburg Municipal Airport, MA8 mi36 minN 010.00 miFair72°F70°F94%1017.6 hPa
Nashua - Boire Field Airport, NH14 mi32 minN 010.00 miFair71°F70°F96%1018.2 hPa
Bedford, Hanscom Field, MA20 mi32 minN 010.00 miFair69°F64°F84%1017.8 hPa
Jaffrey Airport-Silver Ranch, NH24 mi36 minN 010.00 miFair69°F68°F96%1018.9 hPa

Wind History from FIT (wind in knots)
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Last 24hrCalmCalmCalmN3N3CalmCalmCalmCalmN4CalmNE5NE4NE4NE6E6E4E4E4SE4CalmCalmCalmCalm
1 day agoN5NE3NW6N8N6N4CalmCalmCalmNW3NW3N8N6--NE7E5--N4NE4CalmCalmNW3N3N3
2 days agoN7N8N8N7N7N7N6N10N10N11
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Tide / Current Tables for Riverside, Merrimack River, Massachusetts
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Riverside
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Sun -- 04:21 AM EDT     5.86 feet High Tide
Sun -- 06:34 AM EDT     Sunrise
Sun -- 10:51 AM EDT     Moonrise
Sun -- 11:58 AM EDT     0.20 feet Low Tide
Sun -- 04:35 PM EDT     5.98 feet High Tide
Sun -- 06:37 PM EDT     Sunset
Sun -- 09:21 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.11.12.94.85.85.85.34.43.32.11.10.40.20.92.64.55.85.95.64.83.72.51.40.6

Tide / Current Tables for Amelia Earhart Dam, Mystic River, Boston Harbor, Massachusetts
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Amelia Earhart Dam
Click for Map
Sun -- 02:33 AM EDT     9.98 feet High Tide
Sun -- 06:34 AM EDT     Sunrise
Sun -- 08:38 AM EDT     0.55 feet Low Tide
Sun -- 10:50 AM EDT     Moonrise
Sun -- 02:48 PM EDT     10.23 feet High Tide
Sun -- 06:37 PM EDT     Sunset
Sun -- 09:05 PM EDT     0.31 feet Low Tide
Sun -- 09:22 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
6.18.49.89.98.874.82.50.90.71.83.75.98.29.810.29.47.75.63.31.20.30.92.4

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 Boston, MA (22,6,7,8)
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Ground Weather Radar Station Boston, MA
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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.