Wednesday, May23, 2018 L-36.com


Marine Weather and Tides
Popponesset, MA

Version 3.4
What's New / NOTES
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 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.

Sunrise 5:12AMSunset 8:03PM Wednesday May 23, 2018 8:20 PM EDT (00:20 UTC) Moonrise 1:54PMMoonset 2:21AM Illumination 67% Phase: Waxing Gibbous; Moon at 9 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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ANZ232 Nantucket Sound- 716 Pm Edt Wed May 23 2018
Tonight..W winds 5 to 10 kt, becoming N after midnight. Seas 1 to 2 ft.
Thu..N winds 5 to 10 kt, becoming se in the afternoon. Seas 1 to 2 ft.
Thu night..SW winds 10 to 15 kt. Gusts up to 25 kt after midnight. Seas 2 to 3 ft.
Fri..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft.
Fri night..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft.
Sat..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Sat night..SW winds 10 to 15 kt with gusts up to 20 kt, becoming S 5 to 10 kt after midnight. Seas 2 to 3 ft. Areas of fog. A chance of showers. Vsby 1 to 3 nm.
Sun..E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 nm.
Sun night..E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 nm.
Mon..E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 nm.
Mon night..W winds around 5 kt. Seas around 2 ft. A chance of showers. Vsby 1 to 3 nm. 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 716 Pm Edt Wed May 23 2018
Synopsis for massachusetts and rhode island coastal waters.. High pressure will build over the waters on Thursday and will settle south of the waters on Friday. A cold front will slowly settle across the waters from the north on Saturday. This front will become mainly stationary over the waters for Sunday and Monday. 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 Popponesset, MA
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location: 41.44, -70.38     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 232338
afdbox
area forecast discussion
national weather service boston norton ma
738 pm edt Wed may 23 2018

Synopsis
Other than a few brief showers possible this evening across
eastern ma, dry weather will continue for the remainder of the
work week with very warm temperatures for Friday afternoon.

Warm and humid conditions continue on Saturday ahead of an
approaching cold front from northern new england, bringing
scattered showers and isolated thunderstorms late Saturday into
Saturday night. The front stalls south of the region, with
patchy showers lingering through the remainder of the holiday
weekend.

Near term until 6 am Thursday morning
725 pm update...

areas of quick moving showers ahead of an approaching cold front
moving across the route 2 area of N central and NE mass will
push offshore and weaken through around 02z or so, clipping
along E coastal mass and outer CAPE cod. Should see brief precip
as these showers pass. Noting the remnants of the southerly
sea breeze across N ct into interior SE mass, which may enhance
some of the showers as they pass. Elsewhere, dry conditions in
place.

Will see wind shift to w-nw as the front passes, and may see
brief gusts up to 15-20 kt. Clouds will linger across E and
central mass into E ri, while skies will average out mostly
clear further w.

Have updated near term to reflect current conditions and
incorporated into the evening forecast.

Previous discussion...

a secondary cold front across northern new england will drop
southward into our region this evening. Limited moisture in any
showers and diminishing instability will keep any of this
activity short lived and isolated.

From the late evening onward, expect dry weather with overnight
lows bottoming out in the upper 40s to the middle 50s.

Short term 6 am Thursday morning through Thursday night
Thursday...

large high pressure in control will result in plenty of
sunshine and a beautiful day. Somewhat cooler mid level temps
behind tonight S cold front will keep high temps mainly in the
70s. However... Weak pressure gradient will allow for sea breezes
holding high temperatures in the 60s along the coast.

Thursday night...

high pressure will move off the coast Thu night allowing for a
return south to southwest flow of milder air. Initially
boundary layer may decouple enough to allow for overnight lows
to drop into the upper 40s to the lower 50s near or just after
midnight in some locations. However... Some boundary layer
mixing may occur resulting in rising temps toward daybreak in
locations that are able to decouple for a time.

Long term Friday through Wednesday
Overview...

12z model suite continues to signal the flattening of the
northern stream h5 ridge across the great lakes into southern
ontario by this weekend. A broad, nearly zonal steering flow
will take over through the holiday weekend into early next week.

Short wave in the northern stream flow will shift E late
sat Sat night, which looks to merge with another short wave
working s-sw out of northern new england as a backdoor cold
front moves across. SW winds ahead of this front will bring
moisture up the eastern seaboard, along with the moisture
associated with the southward bound cold front.

The front should clear the S coast Sunday morning, bringing
cooler temperatures, then stalls in the zonal flow off the s
coast early next week. This may mean a continued unsettled
pattern with patchy showers until later Tuesday as another front
pushes SE out of central canada. Medium range models continue
to signal drier conditions with near normal temperatures by the
middle of next week.

Details...

Friday and Friday night...

high pressure off the mid atlantic coast will bring a warm w-sw
wind flow across most of the region. However, it will be cooler
along the S coast with the onshore wind. Excellent mixing in
place through h85 with lapse rates at 8c km or higher, so
expect temps to rise to the mid and upper 80s away from the s
coast. May also see w-sw winds gusting up to 20-25 kt along the
immediate S coast, CAPE cod and the islands.

Dewpts slowly increase Fri night with the SW wind flow, so
temps will only fall back to the upper 50s to mid 60s, coolest
along the immediate S coast.

Saturday and Sunday...

clouds increase from n-s as a backdoor cold front works s-sw
out of northern new england. Noting dewpoint pooling, up to the
lower-mid 60s by late Sat or Sat night, highest across n
ct ri SE mass. Pwats increase to around 1.5 to 1.7 inches sat
night, highest along the S coast. Best instability moves in as
the front approaches, with total totals from 48-50, k indices up
to 30-35 and tq values in the upper teens. So, have mentioned
slight chance for thunderstorms starting across NE mass around
21z or so sat, then spreading S Sat night. Highs will again
reach the 80s away from the S coast.

The front should slowly push across the region through around
12z sun, then stall just off the S coast as it becomes parallel
to the mid level steering flow. Spotty showers may linger
through Sunday as moisture continues to feed up the coast and
along the stalled front. Easterly winds set up, so cooler temps
will prevail. Expect readings to only reach the lower 60s along
the immediate E coast, ranging to the lower 70s across the ct
valley.

Monday through Wednesday...

expect continued unsettled conditions Monday into Tuesday with
the stalled front remaining off the S coast. May see a weak wave
move along the front during Monday, which may enhance some of
the scattered showers. Then, another front pushes SE out of
central canada during Tuesday. This should push the moisture s
of the region, though a few showers may still linger especially
around the route 2 area of N mass.

Medium range in fairly good agreement in pushing another large
high pressure center out of southern ontario into the northeast
u.S. By next Wednesday. This should bring dry conditions and
near seasonal temperatures.

Aviation 00z Thursday through Monday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday night ...

tonight through Thursday night... High confidence in mainlyVFR
conditions right through Thursday night. A quick moving, few
brief showers this evening across eastern mass which should move
off the outer CAPE by 03z. Otherwise, the main issue will be
timing the arrival departure of diurnal sea breezes along
portions of the coast during Thursday.

Kbos terminal... High confidence inVFR conditions. Sea breeze
should develop around 15z-17z Thursday.

Kbdl terminal... High confidence inVFR conditions.

Outlook Friday through Monday ... Moderate confidence.

Friday through Friday night:VFR. Breezy.

Saturday: mainlyVFR, with local MVFR possible. Breezy. Chance
shra.

Saturday night: mainly MVFR, with local ifr possible. Chance
shra, slight chance tsra.

Sunday through Sunday night: mainly MVFR, with local ifr
possible. Chance shra.

Memorial day: chance shra.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Thursday night ...

tonight and Thursday... High confidence. A weak pressure gradient
with high pressure in control will keep winds and seas below
small craft advisory thresholds.

Thursday night... Moderate to high confidence. High pressure
moving off the coast will result in southwest winds developing.

Enough of a low level jet may result in marginal small craft
conditions with southwest wind gusts of 20 to 25 knots and
marginal 3 to 5 foot seas across the outer-waters.

Outlook Friday through Monday ... Moderate confidence.

Friday: moderate risk for small craft advisory winds with local
gusts up to 30 kt. Areas of seas approaching 5 ft.

Friday night: moderate risk for small craft advisory winds with
gusts up to 30 kt. Local rough seas.

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

Saturday night: winds less than 25 kt. Seas locally approaching
5 ft. Chance of rain showers, areas fog, slight chance of
thunderstorms. Local visibility 1 to 3 nm.

Sunday: winds less than 25 kt. Seas locally approaching 5 ft.

Chance of rain showers.

Sunday night: winds less than 25 kt. Local rough seas. Chance
of rain showers, areas fog. Local visibility 1 to 3 nm.

Memorial day: winds less than 25 kt. Areas of seas approaching
5 ft. Chance of rain showers.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Frank evt
near term... Frank evt
short term... Frank
long term... Evt
aviation... Frank evt
marine... Frank evt


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 6 mi40 min SSW 9.7 G 12 58°F 57°F1011.9 hPa56°F
WAXM3 - Waquoit Bay Reserve, MA 12 mi95 min 1.9 66°F 1012 hPa59°F
BZBM3 - 8447930 - Woods Hole, MA 16 mi50 min 59°F 58°F1012.2 hPa
NTKM3 - 8449130 - Nantucket Island, MA 18 mi62 min WSW 6 G 9.9 61°F 60°F1012.4 hPa
44090 28 mi50 min 55°F
BUZM3 - Buzzards Bay, MA 35 mi80 min SW 17 G 17 60°F 1012.5 hPa (-0.0)
FRVM3 - 8447386 - Fall River, MA 45 mi56 min 74°F 59°F1012.3 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi50 min SSW 11 G 15 71°F 1011.6 hPa
FRXM3 46 mi50 min 73°F 58°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Marthas Vineyard Airport, MA13 mi27 minSSW 610.00 miFair60°F57°F90%1012.5 hPa
Otis Air National Guard Base, MA17 mi25 minWSW 1010.00 miFair64°F59°F83%1012.5 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA17 mi24 minSW 910.00 miFair66°F59°F78%1011.7 hPa
Nantucket, Nantucket Memorial Airport, MA21 mi27 minSW 77.00 miFair54°F54°F100%1012.6 hPa

Wind History from MVY (wind in knots)
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Last 24hrS6S8CalmCalmCalmCalmCalmCalmW3SW3SW3W7W7W6W9SW86NW7SW10S10S9SW8SW7SW6
1 day agoSW8SW7SW5SW5SW5SW6SW4SW4SW3SW4SW3S5S6S9S6S10S9S11SW9S7SW6S6S6S6
2 days agoW45W3N4N4N5N4N9N7N9N8N7N7NE7E8E7--S8S11SW12S13SW13SW10SW7

Tide / Current Tables for Cape Poge, Chappaquiddick Island, Massachusetts
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Cape Poge
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Wed -- 12:30 AM EDT     0.18 feet Low Tide
Wed -- 02:21 AM EDT     Moonset
Wed -- 05:16 AM EDT     Sunrise
Wed -- 07:24 AM EDT     2.40 feet High Tide
Wed -- 01:05 PM EDT     0.03 feet Low Tide
Wed -- 01:54 PM EDT     Moonrise
Wed -- 08:01 PM EDT     Sunset
Wed -- 08:06 PM EDT     2.38 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.20.20.50.91.21.72.12.42.321.50.80.300.20.50.81.31.82.22.42.31.81.3

Tide / Current Tables for Nantucket Harbor Entrance Channel, Massachusetts Current
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Nantucket Harbor Entrance Channel
Click for Map
Wed -- 01:36 AM EDT     0.00 knots Slack
Wed -- 02:20 AM EDT     Moonset
Wed -- 03:19 AM EDT     0.92 knots Max Flood
Wed -- 05:14 AM EDT     Sunrise
Wed -- 06:26 AM EDT     -0.00 knots Slack
Wed -- 11:45 AM EDT     -1.43 knots Max Ebb
Wed -- 01:53 PM EDT     Moonrise
Wed -- 01:57 PM EDT     0.00 knots Slack
Wed -- 03:49 PM EDT     1.07 knots Max Flood
Wed -- 07:59 PM EDT     Sunset
Wed -- 08:53 PM EDT     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
-1.3-0.60.40.90.80.40.1-0-0.1-0.3-0.8-1.3-1.4-0.900.91.10.80.40.20.2-0-0.5-1.1

Weather Map and Satellite Images
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wmap_A
GOES Local Image of Northeast    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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (20,4,5,8)
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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.