Tuesday, March26, 2019 L-36.com


Marine Weather and Tides
Siasconset, MA

Version 3.4
What's New / NOTES
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome.
10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name.

Sunrise 6:36AMSunset 7:04PM Tuesday March 26, 2019 5:55 AM EDT (09:55 UTC) Moonrise 12:15AMMoonset 10:23AM Illumination 71% Phase: Waning Gibbous; Moon at 20 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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7 Day Forecast for Marine Location Near Siasconset, MA
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location: 38.84, -69.85     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 260749
afdbox
area forecast discussion
national weather service boston norton ma
349 am edt Tue mar 26 2019

Synopsis
Building high pressure through Wednesday with seasonable, dry
weather. A weak cold front may bring a few showers Thursday
night, otherwise moderating temperatures Thursday into Friday.

Mild weather next weekend, but low pressure may bring a period
of rain sometime late Sunday into Monday with much cooler
weather possible by Monday.

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

chilly start. Cloud shield continues to erode s. Where winds are
onshore with higher dewpoint, rather than a drier N wind, seeing
some low clouds develop as the boundary layer cools, condenses,
mainly over SE new england with scattered to broken ceilings
around 2-3 kft agl. Will see N winds uptick W to E through this
morning making it feel colder with lows around the 20s for the
bus stop, roughly about 5 to 10 degrees. Cloud shield continuing
to erode s, expect plenty of sunshine at sunrise. Sunglasses
advised with morning solar glare.

Today ...

dry. Near-seasonable. Influential dome of high pressure beneath
a mid-level sweeping h5 trof axis and attendant vortmax. Overall
dry column as N winds persist in wake of aforementioned dynamics
and as mid-atlantic surface low pressure ejects out to sea, winds
that diminish with time allowing onshore sea-breezes along E ma
later in the day. Well-mixed to h8, dropped dewpoints considerably
into the single digits. Highs around the low to mid 40s. Mostly
clear conditions, abundant sunshine.

Short term 6 pm this evening through 6 pm Wednesday
Tonight ...

chilly again. Dome of high pressure more influential, light winds
and mostly clear conditions, leaned with coldest forecast guidance
mainly consisting of MOS guidance that has undergone bias correction.

Looking at lows around 20 degrees for most of S new england.

Wednesday ...

beautiful day. Beneath high pressure, light winds becoming s, abundant
sunshine, slightly warmer aloft, looking at highs around the mid to
upper 40s with another day of very dry conditions, dewpoints back
down into the single digits with boundary-layer mixing. Keep the
lip balm on hand.

Long term Wednesday night through Monday
Highlights...

* dry weather prevails much of this time period
* warming trend from Thursday through Saturday
* low risk of showers Thu night Fri morning, then again
sometime Saturday night into Monday morning
Thursday through Saturday...

high pressure should move farther out to sea Thursday, which will
permit a cold front to approach southern new england towards
daybreak Friday. Above normal temperatures expected during this
time. Rainfall chances will be scattered at best and mainly confined
towards northwest massachusetts, at least until a low pressure moves
through the great lakes Saturday. It is possible a secondary low
pressure develops more towards our region Saturday night as this
system passes by. This would lead to a more widespread, but still
light, rainfall. Have only moderate confidence in the timing of
rainfall chances during this portion of the forecast.

Sunday into Monday...

expecting Sunday to be another transition day, not atypical of
spring. As a weak low pressure passes by, our warming trend is
snapped and we start trending toward lower temperatures. Still
thinking temperatures will be above normal, but noticeably colder
conditions by Monday when compared to the warmth of Saturday. High
pressure building in from the west should mean drier weather
developing from west to east on Monday.

Aviation 08z Tuesday through Saturday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday ...

today ...

vfr. Morning sct-bkn MVFR 2-3 kft over SE ma eroding quick. N
winds persisting however E ma sea-breezes developing around 15z.

Tonight ...

vfr. Light N winds. Skc.

Wednesday ...

vfr. Light winds becoming s. Skc.

Kbos terminal ...

n winds this morning, watching for sea-breeze development around
15z.

Kbdl terminal ...

high confidence in taf
outlook Wednesday night through Saturday ...

Wednesday night:VFR.

Thursday:VFR. Breezy.

Thursday night:VFR. Breezy. Chance shra.

Friday:VFR.

Friday night: mainlyVFR, with local MVFR possible. Slight
chance shra.

Saturday:VFR. Breezy.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Wednesday ...

today ...

mid-atlantic surface low pressure ejecting out to sea as high
pressure builds into the waters, a brief period of 25 kt gusts
and 5 foot seas for the S SE outer waters especially, concluding
by sunset.

Tonight and Wednesday ...

beneath high pressure, light winds prevailing, seas diminishing,
good boating weather prevails.

Outlook Wednesday night through Saturday ...

Wednesday night: winds less than 25 kt.

Thursday: winds less than 25 kt. Areas of seas approaching
5 ft.

Thursday night: winds less than 25 kt. Seas up to 5 ft. Slight
chance of rain showers.

Friday: winds less than 25 kt. Seas up to 5 ft.

Friday night: winds less than 25 kt. Areas of seas approaching
5 ft.

Saturday: winds less than 25 kt. Seas up to 5 ft.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory until 8 pm edt this evening for anz255.

Small craft advisory from 8 am this morning to 8 pm edt this
evening for anz254.

Small craft advisory until 11 am edt this morning for anz235-
237.

Small craft advisory until 2 pm edt this afternoon for anz256.

Synopsis... Belk sipprell
near term... Sipprell
short term... Sipprell
long term... Belk
aviation... Belk sipprell
marine... Belk sipprell


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Nantucket, Nantucket Memorial Airport, MA168 mi63 minNNE 610.00 miFair30°F25°F82%1019.4 hPa

Wind History from ACK (wind in knots)
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Last 24hrSW8SW11W6NW6NW7N11N11N13NE16N13NE12NE9NE8E7E6E7E5E3E4E3E4NE4NE5NE6
1 day agoW8W7W14W16W15
G20
W18W19
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SW16
G24
SW21
G28
SW20SW21SW22
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SW18SW16SW12SW15SW14SW17W15W15W13W12W10W9
2 days agoW25
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W15
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W18
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W12
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W17
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W14
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W16
G26
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G26
NW13
G20
W15
G21
W12NW12NW13

Tide / Current Tables for
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Weather Map and Satellite Images
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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 (5,6,7,8)
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Ground Weather Radar Station Upton, NY
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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.