Thursday, August17, 2017 L-36.com


Marine Weather and Tides
Onset, 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 5:53AMSunset 7:40PM Thursday August 17, 2017 1:48 AM EDT (05:48 UTC) Moonrise 1:23AMMoonset 4:19PM Illumination 26% Phase: Waning Crescent; Moon at 25 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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ANZ234 Buzzards Bay- 116 Am Edt Thu Aug 17 2017
Rest of tonight..N winds around 5 kt. Seas around 2 ft.
Thu..NE winds around 5 kt, becoming S with gusts up to 20 kt in the afternoon. Seas 1 foot or less.
Thu night..SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 1 foot or less.
Fri..S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 1 foot or less. A chance of showers.
Fri night..S winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 3 ft. Patchy fog. Showers with a chance of tstms. Some tstms may produce heavy rainfall. Vsby 1 nm or less.
Sat..S winds 10 to 15 kt with gusts up to 25 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Patchy fog. Showers likely with a chance of tstms. Some tstms may produce heavy rainfall. Vsby 1 nm or less.
Sat night..SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Sun..W winds 5 to 10 kt. Seas 1 foot or less.
Sun night..W winds 5 to 10 kt. Seas 1 foot or less.
Mon..W winds 5 to 10 kt. Seas 1 foot or less.
Mon night..SW winds 5 to 10 kt. Seas 1 foot or less. 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 Thu Aug 17 2017
Synopsis for massachusetts and rhode island coastal waters.. High pressure returns for Thursday. A warm front will bring a chance of rain for Fri into Sat. High pressure will return on Sunday. 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 Onset, MA
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location: 41.74, -70.66     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 170532
afdbox
area forecast discussion
national weather service taunton ma
132 am edt Thu aug 17 2017

Synopsis
Dry and pleasant conditions continue into tomorrow. A weather
system moving through the great lakes region towards the end of
the workweek will bring showers and scattered thunderstorms to
southern new england during Friday and Saturday. High pressure
returns with fair seasonable weather Sunday and Monday. A cold
front approaches from the west Tuesday and Wednesday, bringing
our next chance of showers.

Near term until 6 am this morning
200 am update...

forecast remains on track for the overnight hours. Weak wave moving
through the northwest flow this morning has trigger some strato cu
per latest IR imagery. Dewpoints continue to drop with a few
locations across northeast ma in the 40s. Surface temps are
radiating out with some locations in the low to mid 60s. Metro
regions are hanging tough with temps in the 70s, but with the cooler
dewpoints anticipate them to drop over the next few hours. Overall
a very pleasant night across southern new england.

Short term 6 am this morning through 6 pm Friday
Tomorrow...

high pres crests over the region providing stout subsidence.

Despite the mostly sunny conditions this suggests, the
combination of suppressed mixing and a cooler start to the day
will lead to overall high temps a few degrees cooler than
yesterday. This is also in spite of generally W flow. Mainly
upper 70s and low 80s in the warmest spots where the downsloping
can be maximized. Overall a pleasant day especially with dwpts
remaining in the 50s.

Will still need to watch mainly exposed beaches across CAPE cod
and nantucket, as the remnants of gert continue to shift east, a
lingering swell could maintain a moderate risk for rip currents
through the day in these areas.

Tomorrow night...

a pleasant evening to start, however upper lvl wave will be
tilting and lifting through ontario and quebec with sfc wave
pushing a warm front toward new england. Pwats increase through
the overnight hours, such that by 12z fri, they near 2.00
inches (or nearly 2 std deviations above normal). Initial
overruning is weak and this moisture load is from the top of the
column to the sfc. Therefore, expecting only building clouds
through the evening, with the risk for any precipitation holding
off until the early morning hours. Indeed, timing of
measurable QPF has slowed on regional models due to this
initial lack of lift and dry column. Still could see some
wetting rainfall by sunrise mainly W of the worcester hills in
ma and thames river region of ct. Noting some QPF bullseyes,
but these are mostly likely some convective feedback. Column
remains relatively stable through 12z.

The increased moisture from w-e will limit diurnal cooling in
spite of the weak pres gradient to start. Coolest areas will
likely be across E ma ri, where some radiational cooling can
occur initially. Overnight mins range from the upper 50s in
these cooler spots to the low 60s elsewhere due to the increased
cloud cover.

Long term Friday night through Wednesday
Details...

Friday and Saturday... Moderate confidence.

During Friday and Saturday short waves move eastward thru our area,
with the upper ridge axis shifting offshore and upper trough moving
into the great lakes region, gradually approaching our area. Surface
high pressure slides further offshore while surface low churns thru
northern great lakes region, heading towards southern quebec.

On Friday a warm front associated with the great lakes surface low
lifts northward into our area. Southerly flow will bring deep
moisture to southern new england, with precipitable water values
increasing to around 2 inches by midday. This in conjunction with
short waves will allow for rain showers Friday-fri night. Lack of
surface-based CAPE on Friday, but surface lis drop to 0 to
-2 and k indices mid 30s. Should be primarily showers but can't rule
out rumbles of thunder. Could see brief heavy downpours.

During Saturday the surface low's associated cold front advances
eastward through our region, while upper trough approaches from the
west. Models also indicate a zone of upper difluence affecting our
area. While deeper moisture axis shifts offshore, we still start the
day with precipitable water 1.5 inches or so across the eastern half
of the area, somewhat less later in the day. CAPE values 500-1000
j kg. Expecting scattered showers with a chance of thunderstorms.

Max temps are expected to be mainly in the 70s on Friday. Airmass
warms several degrees Saturday with highs ranging from the upper 70s
to mid 80s. High dew points should contribute to areas of fog each
night early morning.

Anticipating a drying trend Saturday night, however models hint at
potential for a weak surface low developing along the front in
northern new england as the upper trough passes thru new england, so
this could keep some clouds and a chance for light rain in our area
at least early. Patchy fog possible.

Sunday through Wednesday...

upper trough lifts out during the Sunday with surface high pressure
building east into the area during Sunday and Monday. So
anticipating a period of mainly dry weather. Then the high moves
offshore Monday night and Tuesday, with increasing moisture later
Tuesday as another short wave and cold front approach from the west.

This could bring our next round of showers for late Tuesday-tue
night and Wednesday.

Aviation 06z Thursday through Monday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday ...

before 00z... High confidence.VFR except some very patchy
ground fog early am mainly at typically prone terminals.

Today... High confidence.VFR. Winds shift lightly W during the
day except sea breezes along coast.

Tonight and tomorrow... Moderate confidence in trends, lower
confidence on timing.VFR to start with deteriorating conditions
after 09z as widespread rain approaches. Conditions will fall to
MVFR ifr through the day as rain moves from west to east and
could be heavy at times restricting vsbys. Iso -tsra is also
possible on Friday. Southerly winds with gusts near 15 kts by
the afternoon.

Kbos terminal... High confidence in taf. Sea breeze development
expected for thu.

Kbdl terminal... High confidence in taf.

Outlook Friday night through Monday ...

Friday through Monday... Moderate confidence.

Saturday... MVFR ifr to start. Improving toVFR, except for possibly
the CAPE and islands where MVFR ifr could linger thru the day. Then
localized MVFR ifr Saturday night in patchy fog possible.

Sunday and Monday...VFR.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Friday ... High confidence.

Noting seas have reached 8-9 ft along the open ocean waters S of
s new england as hurricane gert begins its E shift. This will
allow these seas to gradually recede through the overnight
hours. Small craft advisories continue, but will be able to be
dropped as the night progresses. Otherwise, mainly quiet
boating weather continued into tomorrow night after these seas
recede.

Outlook Friday night through Monday ...

Friday...

winds seas below SCA thresholds to start, however during late
Friday Fri night may see some southerly wind gusts to 25 kts. Seas
building to 3-5 feet Friday night. Increasing chance of showers west
to east during Friday. A small craft advisory may be needed. Showers
and scattered thunderstorms Friday night and reduced visibility
in areas of fog.

Saturday...

lingering showers and scattered thunderstorms Saturday, with reduced
visibility in patchy fog. Seas 3 to 6 feet on the outer waters,
and possibly the exposed portions of the southern waters,
subsiding during Sat night. Southerly winds Saturday turn to the
west Saturday night with gusts to 25 kts possible. A small
craft advisory may be needed.

Sunday and Monday...

high pressure builds over the waters. Winds and seas expected to be
below SCA thresholds. Isolated showers possible early Sunday, but
these move off to the east during the morning.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory for hazardous seas until 8 am edt this
morning for anz254-255.

Synopsis... Doody nmb
near term... Dunten
short term... Doody
long term... Nmb
aviation... Dunten nmb
marine... Doody nmb


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WAXM3 - Waquoit Bay Reserve, MA 13 mi64 min Calm 69°F 1016 hPa67°F
BZBM3 - 8447930 - Woods Hole, MA 15 mi49 min 69°F 72°F1015.8 hPa (+0.6)
44090 19 mi45 min 69°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 27 mi49 min NNE 6 G 7 70°F 1015.6 hPa (+0.9)
FRVM3 - 8447386 - Fall River, MA 27 mi49 min 70°F 73°F1017.1 hPa (+0.9)
FRXM3 28 mi49 min 69°F 58°F
BUZM3 - Buzzards Bay, MA 31 mi49 min N 12 G 13 69°F 1016 hPa (+0.3)
44020 - NANTUCKET SOUND 33 mi59 min NE 3.9 G 3.9 68°F 69°F1 ft1015.9 hPa (+0.8)68°F
PRUR1 35 mi49 min 71°F 56°F
CPTR1 - 8452944 - Conimicut Light, RI 36 mi49 min NNE 6 G 7 69°F 74°F1016.4 hPa (+1.0)
PTCR1 - 8452951 - Potter Cove, Prudence Island, RI 37 mi49 min ENE 7 G 9.9 69°F 1016.4 hPa (+0.9)
NAXR1 - Narragansett Bay Reserve, RI 37 mi64 min NNW 8 69°F 1016 hPa61°F
PVDR1 38 mi49 min N 5.1 G 7 69°F 1016.3 hPa (+1.0)56°F
NWPR1 - 8452660 - Newport, RI 39 mi49 min NNE 4.1 G 7 71°F 69°F1016.1 hPa (+0.9)
FOXR1 - 8454000 - Providence, RI 40 mi49 min NE 4.1 G 4.1 70°F 72°F1016 hPa (+1.2)
QPTR1 - 8454049 - Quonset Point, RI 41 mi49 min NNE 9.9 G 13 72°F 73°F1016.4 hPa (+1.0)
44013 - BOSTON 16 NM East of Boston, MA 42 mi59 min N 12 G 14 69°F 68°F2 ft1015.8 hPa (+1.0)
NTKM3 - 8449130 - Nantucket Island, MA 43 mi55 min Calm G 1.9
BHBM3 - 8443970 - Boston, MA 47 mi49 min 70°F 1015.5 hPa (+0.8)

Wind History for Borden Flats Light at Fall River, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Otis Air National Guard Base, MA9 mi54 minN 510.00 miA Few Clouds66°F60°F83%1016.3 hPa
Plymouth, Plymouth Municipal Airport, MA12 mi57 minNNE 310.00 miFair63°F53°F70%1016.3 hPa
New Bedford, New Bedford Regional Airport, MA17 mi56 minN 410.00 miFair65°F60°F84%1016 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA21 mi53 minNNW 310.00 miPartly Cloudy67°F63°F87%1015.7 hPa
Taunton, Taunton Municipal Airport, MA22 mi57 minN 010.00 miA Few Clouds56°F54°F93%1016.1 hPa
Marthas Vineyard Airport, MA23 mi56 minN 66.00 miFog/Mist66°F62°F87%1015.6 hPa

Wind History from FMH (wind in knots)
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1 day agoCalmS5CalmSW3CalmSW4W5SW4SW5W6SW7SW7
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2 days agoCalmCalmCalmCalmCalmCalmNE4NE4E4S6S7S4SE5
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Tide / Current Tables for Onset Beach, Onset Bay, Buzzards Bay, Massachusetts
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Onset Beach
Click for Map
Thu -- 01:22 AM EDT     Moonrise
Thu -- 04:48 AM EDT     3.62 feet High Tide
Thu -- 05:53 AM EDT     Sunrise
Thu -- 11:03 AM EDT     0.11 feet Low Tide
Thu -- 04:19 PM EDT     Moonset
Thu -- 05:22 PM EDT     4.38 feet High Tide
Thu -- 07:39 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.50.71.42.53.43.63.32.61.60.80.30.10.30.71.52.63.74.34.33.72.91.91.10.6

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Thu -- 01:22 AM EDT     Moonrise
Thu -- 02:29 AM EDT     4.09 knots Max Flood
Thu -- 05:53 AM EDT     Sunrise
Thu -- 06:02 AM EDT     -0.03 knots Slack
Thu -- 08:51 AM EDT     -4.19 knots Max Ebb
Thu -- 11:55 AM EDT     0.18 knots Slack
Thu -- 02:56 PM EDT     3.99 knots Max Flood
Thu -- 04:18 PM EDT     Moonset
Thu -- 06:20 PM EDT     -0.19 knots Slack
Thu -- 07:39 PM EDT     Sunset
Thu -- 09:20 PM EDT     -4.46 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
2.23.5443.62.80.6-2.9-3.9-4.2-3.8-2.70.82.93.843.73.11.7-2.5-3.8-4.4-4.3-3.6

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.