Saturday, April21, 2018 L-36.com


Marine Weather and Tides
Lynn, MA

Version 3.4
What's New / NOTES
3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues.
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.

Sunrise 5:50AMSunset 7:34PM Saturday April 21, 2018 11:41 AM EDT (15:41 UTC) Moonrise 10:27AMMoonset 12:42AM Illumination 37% Phase: Waxing Crescent; Moon at 6 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- 929 Am Edt Sat Apr 21 2018
This afternoon..NW winds 5 to 10 kt. Gusts up to 20 kt early. Waves 1 foot or less.
Tonight..NW winds 5 to 10 kt. Waves 1 foot or less.
Sun..NW winds 5 to 10 kt, diminishing to around 5 kt in the afternoon. Waves 1 foot or less.
Sun night..W winds around 5 kt, becoming nw around 5 kt after midnight. Waves 1 foot or less.
Mon..N winds around 5 kt, becoming se in the afternoon. Waves 1 foot or less.
Mon night..S winds 5 to 10 kt. Waves 1 foot or less.
Tue..SW winds 5 to 10 kt. Waves 1 foot or less.
Tue night..S winds 5 to 10 kt. Waves 1 foot or less.
Wed..SE winds 5 to 10 kt. Waves 1 foot or less. Rain likely.
Wed night..E winds 5 to 10 kt. Waves 1 foot or less. Showers likely. 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 929 Am Edt Sat Apr 21 2018
Synopsis for massachusetts and rhode island coastal waters.. High pressure will build over the waters today through Monday. Then shift offshore on Tuesday. Low pressure will move north along the eastern seaboard Tuesday night and Wednesday, lifting over the waters on Thursday. 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 Lynn, MA
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location: 42.45, -70.95     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 211336
afdbox
area forecast discussion
national weather service boston norton ma
936 am edt Sat apr 21 2018

Synopsis
High pressure building over the great lakes today moves east
over new england for Sunday and Monday, then off to the east
Tuesday. This will bring our area dry weather and gradually
rising temperatures. Wet and breezy weather forecast midweek.

Perhaps a late week lull before becoming dreary again next
weekend.

Near term until 6 pm this evening
935 am update...

clear skies will give way to some fair weather CU late morning
through the afternoon given cold air aloft acting on shallow
low level moisture. Low level NW winds appear just strong
enough to keep sea breezes just offshore. 850 mb temps -2c this
afternoon with mixing depth around or a bit higher than 850 mb.

Highs will reach mid upper 50s, which is just a few degrees
below normal.

Short term 6 pm this evening through 6 pm Sunday
As the high pressure moves overhead, winds will become light and
subsidence should make our skies clear. With dew points in the
20s, except 30-35 CAPE and islands, expect some areas away from
the coast will dip below freezing, the rest will be in the 30s.

The high maintains clear skies and light winds Sunday. This will
allow sea breezes along the coast late morning through
afternoon. Mixing will support MAX temps in the mid 50s to
around 60.

Long term Sunday night through Friday
* highlights...

- warm up early week, dry, watching for seabreezes
- wet, breezy midweek
- perhaps a reprieve Friday, possibly Saturday
- return of wet, dreary weather for the following weekend
overview and model preferences...

defined ridging is expected to define the sensible wx early
this coming week, with height anomalies finally becoming
positive by early mon. H85 temps respond as well, reaching above
0c and likewise, positive anomalies. However, will need to
watch a developing trof just W of the continental divide, a
response to enhanced ridging along the W coast of the pacnw and
bc. This wave shifts rapidly E through the early portion of the
week and looks to phase with a slowly meandering S stream
cutoff. This phasing will bring about a return to longwave trof
across the e, and yield a return to unsettled and wetter wx
reinforced yet again by a secondary shortwave out of the nw
territories late week. Recent runs are struggling somewhat with
the sfc low pres development track with the leading wave. This
is likely due to the fact it will not be fully developed or
sampled until sun. Given this, will lean most heavily on
ensemble means to account for differences in final outcomes.

Details...

mon and tue...

as mentioned above, ridging remains in control. H85 temps rise
above 0c, to an average near +3c mon, then +5c on tue. This
should allow several locations to reach the 60s. Can't rule out
a stray 70f, but noting strong subsidence inversion which may
limit mixing. Also, with weak flow under cresting high pres and
ssts still in the low-mid 40s, sea breezes are likely especially
mon, but also possible tue. This will lead to strong coastal
temp gradient. Cool overnights with radiational cooling.

Wed...

low pres develops across out of the cold pool from remnant
convection across the SE conus. Depending on how quickly the
wave aloft deepens, the low will either track more n, or E with
time. This is where the uncertainty in rainfall totals on wed
reside. The E track would usurp the available moisture and shift
strongest LLJ to the S while a deeper trof would draw the
parent low moisture dynamics N toward new england. Ensemble
means still favor the former over the latter, so this update
will feature this solution, but this will need to be watched. In
either case, pwats and LLJ nearly 2 std deviation above normal
as well as a conditionally unstable profiles suggest at least a
risk for periods of moderate to heavy rain unless the E track
verifies. Low probs of QPF near 1.00 suggested.

Thu and fri...

the depth of the wave will also define sensible wx details on
thu and fri. If the trof deepens later (the low pres E track
suggested above), then Thu could feature continued wet and
unsettled wx. Otherwise a brief period of meso-ridging will
follow. Whether this occurs on Thu and Fri or Fri only is still
somewhat uncertain. With a developing longwave trof and some
moisture clouds shra possible either day, but pops will be
generally lower than wed.

Next weekend...

as mentioned in the overview, a secondary trof will be moving
across the CONUS and merging with the longwave trof, deepening
it across the e. This may lead to another round of wetter and
cooler than normal conditions, but this is of course toward the
end of most deterministic ensemble skill set.

Aviation 14z Saturday through Wednesday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ... High confidence.

No significant changes with 12z TAF update...

today...

vfr. Patchy daytime clouds this afternoon, but with bases above
4500 feet. Northwest winds with gusts around 20 knots midday
and afternoon, diminishing by evening.

Tonight and Sunday... VFR. Mainly clear skies and winds less
than 20 knots. Developing sea breezes Sunday late morning and
afternoon.

Kbos terminal... High confidence in taf. Sea breezes unlikely
today.

Kbdl terminal... High confidence in taf.

Outlook Sunday night through Wednesday ... High confidence.

Sunday night:VFR.

Monday through Tuesday:VFR.

Tuesday night: mainlyVFR. Chance ra late.

Wednesday: mainly MVFR, with local ifr possible. Breezy. Ra
likely.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Sunday ... High confidence.

Northwest winds gusting to 20 knots today, then lighter winds
tonight and Sunday. Seas remain below 5 feet through the
weekend.

Outlook Sunday night through Wednesday ... High confidence.

Sunday night through Tuesday: winds less than 25 kt and weak
seas.

Tuesday night: winds less than 25 kt and weak seas. Slight
chance of rain.

Wednesday: winds less than 25 kt. Seas locally approaching
5 ft. Rain likely, rain showers likely.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Wtb doody
near term... Kjc
short term... Wtb
long term... Doody
aviation... Wtb doody
marine... Wtb doody


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 8 mi41 min 51°F 1024.5 hPa (-0.9)
44013 - BOSTON 16 NM East of Boston, MA 17 mi51 min NW 9.7 G 12 44°F 42°F1 ft1024.9 hPa (+0.0)
44029 - Buoy A0102 - Mass. Bay/Stellwagen 21 mi97 min 43°F 42°F2 ft1024.1 hPa
IOSN3 - Isle of Shoals, NH 40 mi41 min NW 6 G 7 46°F 1024.5 hPa (+0.0)24°F
BGXN3 - Great Bay Reserve, NH 43 mi56 min W 7 51°F 1019 hPa29°F
44098 - Jeffrey's Ledge, NH (160) 48 mi35 min 41°F2 ft

Wind History for Providence, RI
(wind in knots)    EDIT      (on/off)   Help
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N12
G21
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G26
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N10
G20
NE6
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NW13
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G11
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NE4
E9
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G10

Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA6 mi47 minNW 9 G 1810.00 miA Few Clouds50°F24°F36%1025.5 hPa
Beverly, Beverly Municipal Airport, MA9 mi48 minNNW 13 G 1810.00 miFair51°F26°F38%1024.7 hPa
Bedford, Hanscom Field, MA18 mi1.8 hrsNW 10 G 1810.00 miA Few Clouds49°F21°F35%1027 hPa
East Milton, MA19 mi1.8 hrsNW 9 G 23 mi46°F23°F40%1026.3 hPa
Lawrence Municipal Airport, MA21 mi47 minNW 9 G 1710.00 miFair52°F24°F34%1025.7 hPa
Norwood, Norwood Memorial Airport, MA21 mi48 minWNW 10 G 1510.00 miFair52°F25°F35%1025.6 hPa

Wind History from BOS (wind in knots)
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Last 24hrNW15
G23
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G25
NW19
G30
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G25
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NW10W9NW10W10W10W12W11W11W10NW13W11NW10
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1 day agoN3NW55W6W4W6W8NW14NW10W8NW12NW9NW11W13NW16
G20
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2 days agoW13
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W18--W15
G23
W15
G21
W14
G21
W11W13W13
G21
W10W9W9W9W6W8SW6SW6S3W6SW8SW9NW5CalmW7

Tide / Current Tables for Lynn, Lynn Harbor, Massachusetts
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Lynn
Click for Map
Sat -- 12:41 AM EDT     Moonset
Sat -- 03:47 AM EDT     10.67 feet High Tide
Sat -- 05:53 AM EDT     Sunrise
Sat -- 10:10 AM EDT     -0.65 feet Low Tide
Sat -- 10:27 AM EDT     Moonrise
Sat -- 04:30 PM EDT     9.43 feet High Tide
Sat -- 07:32 PM EDT     Sunset
Sat -- 10:29 PM EDT     0.52 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
4.26.58.710.310.69.77.75.22.60.5-0.6-0.11.63.8689.39.38.16.34.12.10.70.7

Tide / Current Tables for Marblehead Channel, Massachusetts Current
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Marblehead Channel
Click for Map
Sat -- 12:41 AM EDT     Moonset
Sat -- 12:56 AM EDT     0.48 knots Max Flood
Sat -- 04:32 AM EDT     -0.00 knots Slack
Sat -- 05:52 AM EDT     Sunrise
Sat -- 07:39 AM EDT     -0.39 knots Max Ebb
Sat -- 10:26 AM EDT     Moonrise
Sat -- 11:22 AM EDT     0.00 knots Slack
Sat -- 01:26 PM EDT     0.43 knots Max Flood
Sat -- 05:06 PM EDT     -0.00 knots Slack
Sat -- 07:32 PM EDT     Sunset
Sat -- 08:04 PM EDT     -0.32 knots Max Ebb
Sat -- 11:41 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.40.50.40.30.1-0.1-0.3-0.4-0.4-0.3-0.3-0.10.20.40.40.40.20-0.2-0.3-0.3-0.3-0.3-0.2

Weather Map and Satellite Images
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wmap_A
GOES Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Wind Forecast for Boston, MA (11,2,3,4)
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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.