Wednesday, June28, 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 5:07AMSunset 8:26PM Wednesday June 28, 2017 1:28 AM EDT (05:28 UTC) Moonrise 10:20AMMoonset 11:49PM Illumination 18% 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- 116 Am Edt Wed Jun 28 2017
Rest of tonight..W winds around 5 kt. Seas 1 foot or less.
Wed..W winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas 1 foot or less.
Wed night..W winds around 5 kt. Seas 1 foot or less.
Thu..SW winds around 5 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft.
Thu night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers and tstms.
Fri..SW winds around 10 kt. Seas around 2 ft. A chance of showers and tstms.
Fri night..SW winds 5 to 10 kt. Seas 1 foot or less.
Sat..SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
Sat night..S winds 5 to 10 kt. Seas 1 foot or less. A chance of showers and tstms.
Sun..SW winds 5 to 10 kt. Seas 1 foot or less. A chance of showers and tstms.
Sun night..W winds 5 to 10 kt. Seas 1 foot or less. A chance of showers and tstms. Winds and seas higher in and near tstms. 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 116 Am Edt Wed Jun 28 2017
Synopsis for massachusetts and rhode island coastal waters.. Showers and Thunderstorms exiting the north shore waters before midnight. Otherwise a cold front sweeps across the waters overnight with winds shifting to west. Dry weather returns as high pressure builds S of the waters Wed. A warm front will lift N through new england Thu with gusty sw winds developing late Thu into Fri and lasting through Sat. 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 280147
afdbox
area forecast discussion
national weather service taunton ma
947 pm edt Tue jun 27 2017

Synopsis
A frontal passage will usher in drier air across the region
overnight. High pressure builds fair and dry weather for
Wednesday. A warming trend begins for the latter half of the
week. Expect summer heat and humidity from Friday through the
weekend. A warm front passes Thursday night, bringing scattered
showers and thunderstorms. More showers and thunderstorms are
possible from Friday through the weekend. A cold front tries to
shift toward the region early next week.

Near term until 6 am Wednesday morning
10 pm update...

convection now offshore with frontal passage wind shift back
from ore-bdl-hfd and will continue moving east ushering in drier
air across the region overnight. More of a early fall airmass
tonight with lows in the upper 40s across northwest ma with 50s
elsewhere.

Previous discussion...

once the convection dies down, expect dry weather the remainder
of the night. Light winds and mostly clear skies will allow fog
to form in some spots, especially parts of the ct valley.

Dew points in the upper 40s and 50s should leave room for temps
to cool down into the 50s most places by early morning.

Short term 6 am Wednesday morning through Wednesday night
The upper trough is overhead along with its cold pool. So
continued support for lift. But the airmass will be much drier
with a moist layer limited to the 750-850 mb layer. Expect
diurnal clouds but precip is unlikely. Temps aloft will be
equivalent to 8-10c at 850 mb, supporting MAX temps 75-80.

High pressure maintains mostly clear skies and light wind should
allow overnight temps to reach the 50s, with lower 60s in the
urban areas.

Long term Thursday through Tuesday
Highlights...

* scattered showers thunderstorms from Thursday night through
Sunday night
* very warm, humid conditions return Friday, lasting through
the weekend
overview...

12z medium range models and ensembles continue same theme for
summer conditions. Active northern stream in place with a broad
mid level fast flow that looks to continue through the upcoming
weekend at least.

H5 short wave cutoff low moves out of saskatchewan and manitoba
on Thursday, which will push across southern canada into the
northern great lakes through this weekend, then into quebec
Monday. Weak short waves will move along in the general w-sw
steering flow around the base of the cutoff low through the
broad trough to its S and sw. Will see rounds of scattered
showers thunderstorms as each short wave moves across. Very
sultry airmass in place thanks to bermuda high sitting off the
carolina coast. Will see dewpts rising to the mid-upper 60s late
this week through the weekend. The offshore high and western
atlantic mid level ridging will cause an approaching cold front
to stall west of the region.

Question will be when the h5 trough will move across the region
early next week. Model solution spread leading to lower
confidence on timing of cold front that may approach around
Monday or the 4th of july.

Details...

Thursday-Thursday night...

high pressure off the mid atlantic SE u.S. Coast will keep dry
conditions across the region through about midday Thursday. A
warm front will start to approach, with some showers that may
develop across N and W mass, mainly N of the mass pike around or
after 21z. Will see some more instability start to work into w
mass N central ct Thu night as the warm front moves across, so
have included chance thunder from w-e.

Highs Thursday will mainly be in the lower-mid 80s away from
the S coast, only in the 70s along the S coast. Overnight lows
will be in the mid-upper 60s.

Friday through Sunday...

with the ridge in place off the coast, continued SW flow
through this period. Typical summertime airmass in place, with
dewpts up to the mid and upper 60s with a few spots that may
touch 70, along with h85 temps rising to +16c to +18c fri-sat.

With the soupy airmass, will likely see nighttime fog develop
mainly around or after midnight as temps fall back close to the
higher dewpts.

Will see scattered showers and thunderstorms from the midday
through evening hours each day, especially across the interior.

Looks like best shot for convection will occur Friday
afternoon evening, then again Saturday especially over western
areas. The ridge offshore may allow for somewhat drier air and
subsidence to move into coastal areas on Saturday, so could be
drier during the daylight hours. Approaching cold front on
Sunday will trigger another round of convection as well.

Will likely see some brief heavy downpours in some activity
thanks to pwats increasing to 1.5 to 1.8 inches, especially
Friday afternoon evening and again Sat night-Sunday.

Some question as to whether some stronger storms will develop
during this timeframe. Will continue to monitor this aspect.

One other issue is possible heat headlines on Fri and sat, due
to combination of high temps (lower 90s) and dewpts (up to 70
degs). Could reach high indices close to 95, which would trigger
possible advisories. Current forecast suggests lower 90s. Will
monitor this as well.

Monday-Tuesday...

low confidence on this portion of the forecast due to model
solution spread, mainly with frontal passage. Some question on
frontal passage late Sun night or Mon morning which will wash
out rather quickly as winds shift back to SW during mon
afternoon. Another front may approach during Tue which may
trigger more convection.

Aviation 02z Wednesday through Sunday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday night ... High confidence.

Tonight...

updated 10 pm...

t-storms now offshore with frontal passage wind shift to the wnw
from ore- bdl-hfd and continuing to move east, ushering in
dry stable airmass overnight. Earlier discussion below.

=====================================================================
areas of fog possible after midnight with the best chance in
the ct river valley north of springfield.

Wednesday...

vfr and drier weather. Showers tstms will fire again north of
mass, but all quiet in southern new england. West-northwest
winds.

Wednesday night...

vfr. Light winds and clearing skies. Patchy fog possible late at
night.

Kbos terminal... High confidence in taf. Showers and t-storms
likely this evening. A few of the stronger storms may contain
small hail and gusty winds.

Kbdl terminal... High confidence in taf. Showers and t-storms
diminish this evening.

Outlook Thursday through Sunday ...

Thursday... High confidence.

MainlyVFR. Dry through midday, then scattered afternoon
evening showers across N and W mass mainly N of the mass pike.

Showers thunderstorms possible entire region Thu night. Gusty
sw winds to 20- 30 kt developing along the S coast late Thu thu
night.

Friday through Sunday... Moderate confidence.

Patchy early morning fog each day with local MVFR-ifr
conditions. Otherwise mainlyVFR. Local MVFR-ifr in possible
strong thunderstorms, mainly during the midday through evening
hours.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday night ... High confidence.

Tonight...

updated 750 pm...

showers and thunderstorms over land will move over parts of the
waters this evening. Best chance will be along the massachusetts
north shore.

Have ended the small craft for the nearshore waters as s-sw
winds have diminished. Expect gusts up to 20 kt through around
04z or so. Seas generally 3 feet or less.

Wednesday and Wednesday night...

winds become wnw at modest speeds. Seas 3 feet or less.

Outlook Thursday through Sunday ...

Thursday... Moderate confidence.

Small craft advisories will likely be needed. SW winds will
increase, with gusts to 25-30 kt highest across the southern
outer waters. Seas build to 6 to 8 ft over southern waters thu
night.

Friday... Moderate confidence.

Sw winds continue, gusting to around 25 kt, diminishing after
midnight Fri night. Seas up to 5 to 7 ft. Scattered
thunderstorms, some with reduced visibilities and strong gusty
winds. Patchy late night fog.

Saturday-Sunday... Moderate confidence.

Sw winds continue, though diminishing. Seas around 5 ft on the
outer waters sat, then slowly subside. Patchy late night fog
each night with reduced visibilities. Chance of
showers thunderstorms.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Wtb evt
near term... Wtb nocera evt
short term... Wtb
long term... Evt
aviation... Wtb nocera evt
marine... Wtb evt


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 8 mi40 min 61°F 1014.2 hPa
44013 - BOSTON 16 NM East of Boston, MA 17 mi38 min SW 7.8 G 9.7 59°F 60°F1 ft1014.5 hPa (-0.8)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 21 mi84 min WSW 7.8 G 7.8 60°F 60°F1 ft1014.2 hPa
IOSN3 - Isle of Shoals, NH 40 mi28 min SW 12 G 15 59°F 1014 hPa (-0.0)55°F
BGXN3 - Great Bay Reserve, NH 43 mi103 min SSW 1 55°F 1015 hPa54°F
44098 - Jeffrey's Ledge, NH (160) 48 mi52 min 58°F2 ft

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA6 mi34 minW 610.00 miMostly Cloudy61°F53°F75%1015.2 hPa
Beverly, Beverly Municipal Airport, MA10 mi35 minSW 39.00 miFair56°F55°F97%1014.3 hPa
East Milton, MA18 mi32 minno data mi55°F53°F93%1016 hPa
Bedford, Hanscom Field, MA19 mi92 minWSW 510.00 miFair55°F52°F90%1016 hPa
Norwood, Norwood Memorial Airport, MA21 mi35 minN 01.00 miFog/Mist56°F55°F97%1015.2 hPa
Lawrence Municipal Airport, MA22 mi34 minSSW 410.00 miFair58°F55°F90%1015.4 hPa

Wind History from BOS (wind in knots)
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Last 24hrS3S3CalmSW5SW5S5SE5SE45W8SE5SE6S6
G16
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G29
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NW7W19
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SW10SW24
G34
SW5W5SE3W6
1 day agoW8W8W9W9W9W9W7W12W13
G19
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S10SW14NE5NW9N6S5
2 days agoW10W6W8W8W8W10W8W8W10
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G25
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W7SW13SW15SW11W9NW9W7W7

Tide / Current Tables for Lynn, Lynn Harbor, Massachusetts
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Lynn
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Wed -- 03:00 AM EDT     11.07 feet High Tide
Wed -- 05:09 AM EDT     Sunrise
Wed -- 09:16 AM EDT     -1.06 feet Low Tide
Wed -- 10:20 AM EDT     Moonrise
Wed -- 03:41 PM EDT     10.11 feet High Tide
Wed -- 08:25 PM EDT     Sunset
Wed -- 09:37 PM EDT     0.11 feet Low Tide
Wed -- 11:49 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
5.78.310.311.110.48.663.10.4-1-0.70.93.15.88.29.810.19.17.24.82.20.40.21.4

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Wed -- 02:36 AM EDT     -0.00 knots Slack
Wed -- 05:09 AM EDT     Sunrise
Wed -- 06:59 AM EDT     -1.34 knots Max Ebb
Wed -- 09:16 AM EDT     0.00 knots Slack
Wed -- 10:20 AM EDT     Moonrise
Wed -- 12:34 PM EDT     1.27 knots Max Flood
Wed -- 03:14 PM EDT     -0.00 knots Slack
Wed -- 07:34 PM EDT     -1.23 knots Max Ebb
Wed -- 08:24 PM EDT     Sunset
Wed -- 09:41 PM EDT     0.00 knots Slack
Wed -- 11:49 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.31.10.4-0.3-0.7-1.1-1.3-1.3-1.1-0.30.71.11.21.20.80.1-0.4-0.8-1.1-1.2-1.2-0.70.30.9

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 (1,6,7,8)
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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.