Sunday, September24, 2017 L-36.com


Marine Weather and Tides
Nahant, 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 6:33AMSunset 6:37PM Sunday September 24, 2017 4:45 AM EDT (08:45 UTC) Moonrise 10:50AMMoonset 9:21PM Illumination 14% 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- 400 Am Edt Sun Sep 24 2017
Today..N winds around 5 kt, becoming E this afternoon. Waves 1 foot or less. Areas of fog this morning with vsby 1 nm or less.
Tonight..S winds around 5 kt. Waves 1 foot or less.
Mon..E winds around 5 kt. Waves 1 foot or less.
Mon night..SE winds around 5 kt, becoming S after midnight. Waves 1 foot or less. Areas of fog. Vsby 1 to 3 nm.
Tue..SE winds around 5 kt. Waves 1 foot or less. Areas of fog. Vsby 1 to 3 nm.
Tue night..S winds around 5 kt. Waves 1 foot or less.
Wed..S winds around 5 kt. Waves 1 foot or less. Areas of fog. Vsby 1 to 3 nm.
Wed night..S winds around 5 kt. Waves 1 foot or less. Areas of fog. A chance of showers. Vsby 1 to 3 nm.
Thu..W winds around 5 kt. Waves 1 foot or less. A chance of showers.
Thu night..N winds 5 to 10 kt. Waves 1 foot or less. A chance of showers. 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 400 Am Edt Sun Sep 24 2017
Synopsis for massachusetts and rhode island coastal waters.. Locally dense fog on the waters surrounding cape cod and the islands will slowly thin and lift this morning. High pressure over the eastern usa will bring light wind and dry weather to the waters today through at least Tuesday. Southerly swell from hurricane maria will move north into the waters late today 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 Nahant, MA
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location: 42.44, -70.94     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 240755
afdbox
area forecast discussion
national weather service taunton ma
355 am 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 in the week.

Near term until 6 pm this evening
Fog lingers early today, both as a broad area over southeast mass
including the CAPE and islands and as smaller patches inland. The
fog will dissipate during the morning. All areas will either start
clear or become clear this morning. Expect sunny skies through the
afternoon.

A weak shortwave is projected to move across northern new england,
and could spread a few clouds our way. Subsidence under the ridge is
likely to diminish any clouds and favor the mostly sunny forecast.

Full Sun will mean deep mixing, with the layer expected to reach to
at least the 850 mb pressure level. The models have been known to
underestimate this depth, so mixing above that level is a reasonable
scenario, and would mean surface temperatures warmer than our
estimates. Both the GFS and ECMWF project 850 mb temps of 17-19c,
the NAM and ggem 18-19c. This suggests inland areas will reach max
sfc temps in the upper 80s and lower 90s. Light wind under the high
pressure will allow sea breezes to develop later this morning. This
will buffer temps, so expect lower MAX temps in eastern mass and ri
especially along the coast.

Interior climate sites are expected to reach MAX temps at or near
record levels. The sea breeze at boston should keep logan airport
below its record.

We do expect coolest temps to be found on CAPE cod. Should the fog
linger longer than anticipated, temperatures may be a few degrees
cooler still.

Short term 6 pm this evening through 6 pm Monday
High pressure remains over the region tonight and Monday. That means
mostly clear skies and light winds. Dew points will mostly be in the
60s much of this time, so min temps tonight will be in the upper 50s
and 60s. Expect a similar mixed layer Monday, with temps at 850 mb
of 17-18c. So MAX temps should be similar to today, upper 80s and
low 90s inland and cooler near the shore. Light flow will again
allow sea breezes to form, buffering temperatures along the
coastline.

Patchy fog will again be possible overnight and early morning,
favoring the usual inland fog spots as well as the south coast.

Long term Monday night through Saturday
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
Tuesday... H85 temperatures 16c to 18c will support very warm
temperatures into Tuesday with surface temperatures reaching well
into the 80s throughout most of the region. The light gradient flow,
however, will set the stage for sea breezes along the coastal plain.

Wednesday through Thursday night... A surface cold front and upper
short wave trough will approach southern new england Wednesday
afternoon. We anticipate scattered showers to develop ahead of the
front Wednesday afternoon in moist, marginally unstable air mass.

Model guidance suggests showalters near zero and k indices abov 30.

Models have been giving a signal that tropical moisture from maria
may become entrained in the air mass just ahead of the front and
increase the risk of a few heavy downpours, although there is
uncertainty in the timing duration of maria's moisture entrainment.

The air mass appears to be unstable enough to support isolated
thunder at least for Wednesday afternoon evening. Due to the upper
shortwave trough having to erode a very strong upper level ridge,
the surface cold front will probably move slowly across southern new
england and may not pass offshore until Thursday night. Thus, we
anticipate scattered showers to persist Wednesday night into
Thursday night. With tropical moisture from maria and precipitable
waters 1.7 to 2 inches, some the showers could contain very heavy
downpours anytime late Wednesday to Thursday night.

The air mass remains mild Wednesday into Thursday, but clouds will
likely temper the high temperatures some. May still experience 70s
to near 80 on Wednesday and probably mid to upper 70s on Thursday.

Friday... Model consensus has the cold front passing offshore to the
southeast of new england Friday morning, and maria passing well
southeast of our region. This will result in drier and cooler air
moving into southern new england, although showers may linger into
the morning for a while in southeast sections. Maria will become
embedded in the westerlies on the leading edge of the mid latitude
upper trough and likely pass out to sea well southeast of new
england. H85 temperatures drop about 10c, and Friday's high
temperatures will be noticably cooler, albeit just closer to normal,
even with plenty of sunshine and downsloping winds. Dewpoints in the
upper 60s and 70s for most of the week will drop into the 40s most
locations during Friday.

Saturday... For now Saturday looks to be dry with near normal
temperatures and very low humidity.

Aviation 08z Sunday through Thursday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Monday ...

today... Moderate-high confidence.

Lingering MVFR ceilings in western and central sections while
eastern mass and ri show ifr CIGS and MVFR ifr vsbys in fog and a
few early morning showers. Drier air is moving in, so we expect
clearing skies andVFR conditions arriving from west to east during
the day. Low clouds may linger on CAPE cod and the islands. North
winds will diminish through the day, although some 20 knot gusts may
linger this morning along the CAPE islands south coast.

Tonight... High confidence.

Diminishing wind.VFR to start in most spots. Southeast mass and ri
will trend to ifr lifr in fog and low clouds. Areas of fog will also
develop across the interior with ifr lifr conditions.

Sunday... High confidence.

Fog burns off during the morning. Most of the day will beVFR with
light winds. Sea breezes expected along the coastlines, including
bos.

Kbos taf... Moderate confidence. Ifr CIGS and potential 4sm vsbys in
low clouds and drizzle fog early. Conditions should improve toVFR
late this morning with clearing during mid to late afternoon. North
to northeast winds will diminish through the day.

Kbdl taf... High confidence in taf. Borderline MVFRVFR CIGS will
improve as clearing skies over the berkshires sweep east this
morning. Areas of fog may develop 06z-12z, although the chance of
this is stronger over valley locations north of springfield.

Outlook Monday night through Thursday ...

confidence... High.

Monday night through Tuesday... MostlyVFR except for patchy
late night 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.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Today... High confidence.

High pressure over the eastern usa will bring light wind to the
waters. The remnants of jose well south of our area may favor a
light east wind over our waters. Daytime heating of land areas will
favor a sea breeze along the immediate coast.

Locally dense fog may start the day over the waters around CAPE cod
and islands. This will mean a period of poor visibility to start the
day. This fog should thin and dissipate over most waters by midday
or early afternoon.

Most seas are at 2-3 feet with a period of 10-15 seconds. This is
leftover swell from jose. Higher seas are found on the southern
outer waters, and an additional south swell of 3-4 feet leading
north from maria will start showing itself in our southern waters
later in the day. A high surf advisory remains in place in
anticipation of this swell.

Tonight and Monday...

light wind continues under high pressure. Seas will continue to
build through the period as increasing swell moves north from maria.

South swell should reach 6-8 feet by Monday afternoon, affecting all
of our exposed southern shoreline and possibly the southern beaches
of the outer CAPE late Monday. Expect high surf and dangerous rip
currents as a result of this swell.

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

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

Tides coastal flooding
High surf advisories remain in effect through Monday along the south
coast and the outer CAPE east coast. Swells from maria will likely
increase the surf and associated rip current risk across our ocean-
exposed south coast starting later this afternoon and continuing
through the week. This will be true even though maria may eventually
recurves out to sea well southeast of new england.

Climate
Best chance for record high temps will be today and 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
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... Dense fog advisory until 9 am edt this morning for maz022>024.

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

Ri... Dense fog advisory until 9 am edt this morning for riz008.

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

Marine... Small craft advisory for hazardous seas from 2 pm this
afternoon to 6 pm edt Monday for anz235-237.

Small craft advisory for hazardous seas until 6 pm edt Monday
for anz254>256.

Synopsis... Wtb thompson
near term... Wtb
short term... Wtb
long term... Thompson
aviation... Wtb thompson
marine... Wtb thompson
tides coastal flooding...

climate...



Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 8 mi46 min 65°F 1015.9 hPa (-0.0)
44013 - BOSTON 16 NM East of Boston, MA 17 mi56 min Calm G 1.9 60°F 61°F3 ft1016.5 hPa (-0.0)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 21 mi102 min SW 1.9 G 1.9 60°F 61°F3 ft1015.7 hPa
IOSN3 - Isle of Shoals, NH 40 mi46 min WNW 7 G 7 64°F 1016.4 hPa (-0.0)62°F
BGXN3 - Great Bay Reserve, NH 43 mi61 min Calm 57°F 1017 hPa57°F
44098 - Jeffrey's Ledge, NH (160) 48 mi70 min 62°F4 ft

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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Last
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NE8
G18
NE11
G15
NE11
G15
NE9
G16
NE8
G14
NE11
G15
NE12
G16
NE7
G13
E11
NE12
G16
NE9
G14
NE9
G14
E8
G11
E8
E3
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NE3
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N1
N5
N2
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E1
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1 day
ago
NE15
G27
NE17
G24
NE15
G20
NE20
G26
NE14
G24
NE17
G23
NE16
G26
NE12
G22
NE16
G21
NE15
G25
NE16
G25
NE17
G24
NE15
G27
NE14
G23
NE13
G22
NE11
G25
NE15
G20
NE14
G18
NE12
G18
NE13
G18
NE12
G22
NE9
G15
NE14
G21
NE13
G20
2 days
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NE12
G21
NE18
G24
NE17
G26
NE18
G28
NE21
G28
NE17
G28
NE18
G23
NE17
G25
NE19
G29
NE19
G31
NE20
G29
NE17
G26
NE18
G25
NE16
G22
NE13
G21
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G18
NE13
G18
NE21
G26
NE24
G32
NE22
G33
NE20
G32
NE17
G25
NE18
G29
NE18
G27

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA6 mi52 minN 010.00 miFair62°F61°F96%1016.8 hPa
Beverly, Beverly Municipal Airport, MA10 mi53 minN 010.00 miFair60°F59°F96%1015.8 hPa
East Milton, MA18 mi50 minNNW 8 mi66°F60°F81%1017.8 hPa
Bedford, Hanscom Field, MA19 mi1.8 hrsN 010.00 miFair59°F55°F90%1017.5 hPa
Norwood, Norwood Memorial Airport, MA21 mi53 minN 04.00 miFog/Mist57°F55°F93%1016.7 hPa
Lawrence Municipal Airport, MA22 mi52 minN 010.00 miFair64°F61°F90%1017.3 hPa

Wind History from BOS (wind in knots)
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Last 24hrN12N12N9N11N11N9N12NE9E8E11E11E7E6SE6CalmNE3S4S3CalmCalmCalmCalmCalmCalm
1 day agoN18
G31
N20
G30
N21
G26
N19
G25
N22
G28
N19
G27
N19
G29
N21
G32
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N16N15
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N14N14N15
2 days agoN21
G30
N23
G30
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G30
NE21
G30
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G33
N23
G30
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G31
N25
G34
N23
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--NE21
G33
NE20N18
G24
N16
G21
N14N11N15NE17
G25
NE18
G26
N19
G27
NE25
G30
N21
G32
N21
G30
N21
G30

Tide / Current Tables for Lynn, Lynn Harbor, Massachusetts
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Lynn
Click for Map
Sun -- 02:33 AM EDT     9.58 feet High Tide
Sun -- 06:33 AM EDT     Sunrise
Sun -- 08:33 AM EDT     0.56 feet Low Tide
Sun -- 10:50 AM EDT     Moonrise
Sun -- 02:48 PM EDT     9.82 feet High Tide
Sun -- 06:37 PM EDT     Sunset
Sun -- 09:00 PM EDT     0.32 feet Low Tide
Sun -- 09:21 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
68.19.49.58.46.74.52.30.80.71.93.75.87.99.49.897.45.331.10.312.4

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sun -- 02:12 AM EDT     -0.00 knots Slack
Sun -- 06:33 AM EDT     Sunrise
Sun -- 06:35 AM EDT     -1.15 knots Max Ebb
Sun -- 08:41 AM EDT     0.00 knots Slack
Sun -- 10:49 AM EDT     Moonrise
Sun -- 11:57 AM EDT     1.17 knots Max Flood
Sun -- 02:33 PM EDT     -0.00 knots Slack
Sun -- 06:37 PM EDT     Sunset
Sun -- 07:04 PM EDT     -1.22 knots Max Ebb
Sun -- 09:13 PM EDT     0.00 knots Slack
Sun -- 09:21 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.10.80.1-0.4-0.8-1-1.1-1.1-0.60.311.11.210.4-0.2-0.7-1-1.1-1.2-1-0.20.61

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 (4,6,7,8)
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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.