Monday, March25, 2019 L-36.com


Marine Weather and Tides
Nantucket, 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 6:34AMSunset 6:59PM Monday March 25, 2019 8:45 PM EDT (00:45 UTC) Moonrise 12:00AMMoonset 9:37AM Illumination 75% 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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ANZ255 Coastal Waters Extending Out To 25 Nm South Of Marthas Vineyard And Nantucket- 716 Pm Edt Mon Mar 25 2019
.small craft advisory in effect from 4 am edt Tuesday through Tuesday afternoon...
Tonight..E winds 5 to 10 kt, becoming ne 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. A slight chance of showers this evening.
Tue..N winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
Tue night..N winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Wed..NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 3 to 5 ft.
Wed night..SE winds 5 to 10 kt. Seas 2 to 4 ft.
Thu..S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft.
Thu night..S winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Fri..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft.
Fri night..S winds around 10 kt. Seas 3 to 5 ft.
Sat..S winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft.
Sat night..S winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 7 ft. 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 Mon Mar 25 2019
Synopsis for massachusetts and rhode island coastal waters.. A coastal storm will track east near our southern waters tonight while high pres over the great lakes builds e. High pres will continue to build E over the waters Tue and Wed, shifting offshore Wed night. A weak cold front approaches the waters Thu night, becoming nearly stationary over the northern portion of the waters on Fri and Fri night. Low pres will approach from the W on Sat then traverse the S coast on Sun. 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 Nantucket, MA
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location: 41.27, -70.06     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 252326
afdbox
area forecast discussion
national weather service boston norton ma
726 pm edt Mon mar 25 2019

Synopsis
A coastal storm will track well out to sea tonight. High
pressure builds in from the west Tuesday into Wednesday with
cool and 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 through Tuesday
715 pm update...

the back edge of the cloud shield associated with the low
passing to our south is approaching western ma ct this
evening... Should start to see clearing from northwest to
southeast between about 9pm and 3am. Light seabreeze noted along
the east coast late this evening should switch back to NW over
the next few hours.

Previous discussion...

mid level shortwave moves to the mid atlc coast
tonight with coastal low pres tracking well south of new eng.

This shortwave will keep mid level cloud shield near the south
coast for at least the first half of tonight and it may even
push a bit to the north, before moving offshore late tonight.

However, northern stream shortwave dropping into northern new
eng with W NW flow aloft will keep deeper moisture to the south.

There is a low risk for a few sprinkles or light showers this
evening from bid to ack, otherwise dry.

Good radiational cooling, especially north of the pike where
clear skies will prevail. Lows will drop into the teens and low
20s here. More clouds along the south coast where expected lows
will be in the upper 20s.

Short term Tuesday night
Tuesday...

mid level shortwave moves south across sne, but airmass is bone
dry as high pres builds in from the west. Pwats dropping to less
than 0.1" with dewpoints down into the single numbers. Other
than a few high clouds, a sunny day expected but chilly with
temps 5-10 degrees below normal. High upper 30s to lower 40s.

Tuesday night...

high pres moves into new eng setting the stage for a cold night
with clear skies and light winds. Lows away from the immediate
coast will drop into the teens, with 20s along the coast.

Long term Wednesday through Monday
Highlights...

* dry weather prevails much of this time period
* gradual warming trend Wed & Thu then 60s possible fri-sun
* low risk of showers Thu ngt Fri am then again Sat night sun
Wednesday...

pleasant day on Wednesday as a 1034mb surface high moves over the
region. Winds back to the southwest behind the low bringing
moderating temperatures, into the mid-upper 40s (less along the
south coast). Light winds and sunny skies will make it feel spring
like.

Thursday and Friday...

Thursday the high exits to the east and we'll be sandwiched between
it and a passing surface low mid-level shortwave over southeast
canada. This increases the pressure gradient and makes for a breezy
but warm day Thursday as southerly winds continue to advect warmer
air northward. Highs should reach into the 50s save for the south
coast CAPE cod where strong onshore flow over the cold ocean waters
keeps temps in the 40s. As this low moves east it drags a cold front
across northern new england. Given the northward placement of the
parent low and recent model trends, there looks to be less of a
chance that we see the front hold together through much if any
of southern new england. Thus, not expecting widespread rains,
but more scattered shower chances Thursday night, best in nw
mass. Neither will we see much of a temperature drop; lows
remain quite warm in the upper 30s to near 40.

Friday attention turns to a low which forms in the lee of the
rockies early Friday and moves through the ohio valley to the great
lakes region by Saturday morning. We'll stay dry under a brief, weak
high pressure, keeping the warming trend going. Highs on Friday
reach into the upper 50s to near 60, except, again, along the south
coast where onshore flow holds temps in the upper 40s low 50s.

Saturday and Sunday...

strong WAA Friday night through at least Saturday. With 925mb temps
approaching 12c, temps should reach well into the 60s, and even
touch 70, especially in northeast ma. As the low approaches, the
pressure gradient tightens and southwest winds will be breezy
through the day. Good surface heating should make for a well mixed
bl and with a 35-40kt LLJ we could see gusts 25-35 mph mixing down.

Big question will be timing of the cold front rain chances. Trending
the forecast to the slower ec solution which has been more
consistently showing a late Sunday early Monday passage. Overall the
better of the two weekend days right now looks to be Saturday, with
increasing rain chances during the day on Sunday ahead of that cold
front. However, at this time period, still plenty of room for
changes.

Aviation 00z Tuesday through Saturday
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday night ...

vfr through the period. Some mid high clouds clearing from north
to south through the evening into the overnight then skc.

Kbos terminal... High confidence in taf.

Kbdl terminal... High confidence in taf
outlook Wednesday through Saturday ...

Wednesday through Wednesday night:VFR.

Thursday:VFR. Breezy.

Thursday night through Friday:VFR. Breezy. Slight chance ra.

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

Saturday:VFR. Breezy. Slight chance ra.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday night ...

a period of N gusts to 25 kt expected on the south coastal
waters late tonight into Tue morning as low pres tracks well to
the south. SCA for south coastal waters. Winds diminish tue
afternoon and evening. Another period of marginal SCA northerly
wind gusts possible late Tue night over eastern waters. A few
showers possible this evening over the southern outer waters,
south of the islands.

Outlook Wednesday through Saturday ...

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

Wednesday night: winds less than 25 kt.

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

Thursday night: low risk for small craft advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Slight chance of rain.

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

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

Saturday: low risk for small craft advisory winds with gusts up
to 25 kt. Seas up to 5 ft.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... Small craft advisory from 4 am to 2 pm edt Tuesday for anz255-
256.

Small craft advisory from 4 am to 11 am edt Tuesday for anz235-
237.

Synopsis... Kjc bw
near term... Kjc bw
short term... Kjc
long term... Kjc
aviation... Kjc bw
marine... Kjc bw


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
NTKM3 - 8449130 - Nantucket Island, MA 2 mi33 min 37°F 42°F1017.9 hPa
44020 - NANTUCKET SOUND 19 mi35 min ESE 12 G 14 38°F 40°F1017.9 hPa28°F
WAXM3 - Waquoit Bay Reserve, MA 33 mi60 min E 1.9 37°F 1018 hPa30°F
BZBM3 - 8447930 - Woods Hole, MA 37 mi33 min 38°F 40°F1017.7 hPa
44090 42 mi45 min 39°F1 ft

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Nantucket, Nantucket Memorial Airport, MA1 mi52 minE 610.00 miFair36°F28°F73%1017.6 hPa

Wind History from ACK (wind in knots)
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Last 24hrSW15SW14SW17W15W15W13W12W10W9SW8SW11W6NW6NW7N11N11N13NE16N13NE12NE9NE8E7E6
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Tide / Current Tables for Nantucket, Nantucket Island, Nantucket Island, Massachusetts
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Nantucket Harbor Entrance Channel, Massachusetts Current
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Nantucket Harbor Entrance Channel
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Mon -- 03:22 AM EDT     -0.00 knots Slack
Mon -- 06:35 AM EDT     Sunrise
Mon -- 08:08 AM EDT     -1.56 knots Max Ebb
Mon -- 09:37 AM EDT     Moonset
Mon -- 10:23 AM EDT     0.00 knots Slack
Mon -- 12:22 PM EDT     1.28 knots Max Flood
Mon -- 04:00 PM EDT     -0.00 knots Slack
Mon -- 06:57 PM EDT     Sunset
Mon -- 08:37 PM EDT     -1.53 knots Max Ebb
Mon -- 10:53 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.310.50.1-0.1-0.4-0.8-1.2-1.6-1.3-0.40.61.21.20.70.30-0.2-0.5-1-1.4-1.5-0.90.1

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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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.