Monday, April23, 2018 L-36.com


Marine Weather and Tides
Harwich Port, 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 5:45AMSunset 7:32PM Monday April 23, 2018 6:59 PM EDT (22:59 UTC) Moonrise 12:36PMMoonset 2:22AM Illumination 62% 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- 326 Pm Edt Mon Apr 23 2018
Tonight..S winds 5 to 10 kt. Seas 1 foot or less.
Tue..S winds 5 to 10 kt. Seas 1 foot or less.
Tue night..SE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. A chance of rain.
Wed..SE winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Patchy fog. Rain. Vsby 1 nm or less.
Wed night..SE winds 15 to 20 kt with gusts up to 30 kt, becoming S 10 to 15 kt with gusts up to 20 kt after midnight. Seas 3 to 5 ft. Patchy fog. Rain likely. Vsby 1 nm or less.
Thu..SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Patchy fog. A chance of showers.
Thu night..SW winds 10 to 15 kt. Gusts up to 25 kt in the evening. Seas 2 to 4 ft.
Fri..SW winds 10 to 15 kt. Seas 2 to 3 ft.
Fri night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers.
Sat..SW winds 5 to 10 kt. Seas 2 to 3 ft.
Sat night..W winds 10 to 15 kt. Seas 2 to 3 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 326 Pm Edt Mon Apr 23 2018
Synopsis for massachusetts and rhode island coastal waters.. High pressure over the waters will shift east tonight and Tuesday. Low pressure will move up the eastern seaboard Tuesday night and Wednesday bringing fog and showers, then crossing the waters by Thursday morning. Another storm will be moving up along the coast Friday night. High pressure will begin to build in from the west Saturday and 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 Harwich Port, MA
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location: 41.57, -70.05     debug


Area Discussion for - Boston, MA
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Fxus61 kbox 231946
afdbox
area forecast discussion
national weather service boston norton ma
346 pm edt Mon apr 23 2018

Synopsis
High pressure remains in control through Tuesday bringing dry
weather with mild daytime temperatures. Low pressure approaches
and then passes through new england Tuesday night into
Wednesday night, bringing rain to the area. Another weak low
pressure center may bring another round of showers to the area
Friday night.

Near term until 6 am Tuesday morning
250 pm update...

the high pressure that was centered overhead today begins to
shift to the southeast of our area tonight. Clear skies continue.

With winds expected to be light, expect good radiational
cooling. Forecasting lows in the 30s for much of the area,
except for low 40s in some urban centers and portions of the
cape and islands. Patchy areas of frost are expected to develop.

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

as the surface high moves further offshore, Tuesday will bring
developing S to SW wind. A sea breeze is possible along east coastal
ma for part of the day, however as the SW flow increases some during
the afternoon, the east coastal sea breeze should come to an end.

Mostly sunny skies expected for much of the day, with increasing
clouds during the afternoon. A slightly warmer day with highs in the
60s across much of the area, some locales may reach 70 degrees. The
cooler area will be the immediate south coast of ma ri, where the
persistent S wind will keep highs in the upper 50s to near 60.

Tuesday night...

models show mid level ridging moving east of our area while deep
trough currently over the lower ohio mississippi valleys works
its way eastward. This pattern shift prompts a moisture-rich
low pressure system to track eastward towards the delmarva
coastline. Moisture well ahead of this system will result in
skies becoming cloudy during the evening, but it will take some
time to moisten the column with respect to any precipitation.

Expecting rain to become likely after midnight. Pwats during the
overnight increase to 1 to 1.3 inches, so some moderate
rainfall possible but generally thinking rainfall of a tenth to
half inch prior to 12z wed.

Cloud cover and increasing dew points will keep overnight lows
somewhat milder, lows in the low to mid 40s for much of the area.

Long term Wednesday through Monday
Highlights...

* wet weather Wednesday, diminishing Wednesday night
* another round of showers possible Friday night and late Saturday
discussion...

the 23 12z operational guidance has come into better agreement
with the details into Thursday. Fairly good overall agreement
thereafter, although the canadian model really GOES off on its
own later this weekend. Preferred a solution more like the gfs
and ECMWF camp. Further prefer an ensemble mean approach,
especially after Thursday.

Wednesday and Wednesday night...

essentially the same story from the past few days. Multiple
waves phase in the vicinity of the central appalachians, or
perhaps into the mid atlantic. Coastal low develops and tracks
north through southern new england Tuesday night into Wednesday
night. This will mean a period of wet weather for our region.

Modest elevated instability still present, so cannot dismiss the
possibility of isolated thunderstorms.

Still looking like a general one half to one inch of rainfall
when all is done. Locally heavier amounts possible in any
persistent slow-moving thunderstorms.

Thursday through Friday...

except for possibly widely scattered late Thursday afternoon or
early evening instability showers over the NW higher terrain, it
looks dry Thursday afternoon through at least most of Friday.

Confidence has increased of at least most of daytime Friday
remaining dry.

Friday night...

a weak coastal low pressure may pass by just close enough for a
risk of showers late Friday into Friday night, mainly across
southeast ma and ri. Also will have to monitor the progress of a
cold front associated with a low pressure in the st. Lawrence
valley, which could also bring a chance for showers across the
western half of southern new england late Friday night. Confidence
remains rather low on these details, so later forecasts may
change.

Rest of this weekend...

a cold front associated with a northern stream trough may
result in scattered showers Saturday, but confidence in details
remains low.

Monday... High pressure expected to build in with drier weather.

Aviation 20z Monday 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 ... High confidence.

Remainder of this afternoon...VFR with clear skies and
excellent visibility. Local sea breezes persist.

Tonight...VFR with clear skies and excellent visibility.

Tuesday...VFR. Prevailing wind out of the ssw, initially light
enough where a sea breeze may develop along east coastal ma for
a time. Then as winds aloft strengthen somewhat during the
afternoon, the winds along east coastal ma should shift back to
the ssw.

Tuesday night...VFR to start. Becoming mainly MVFR after
midnight, with local ifr possible towards daybreak. Shra
spreading into the area mainly after midnight.

Kbos terminal... High confidence in taf. Sea breeze this afternoon,
with a sea breeze probable for late morning into early afternoon
tue.

Kbdl terminal... High confidence in taf.

Outlook Wednesday through Saturday ... High confidence.

Wednesday: mainly ifr, with local MVFR possible. Windy with
local gusts to 30 kt. Ra with isolated tsra. Patchy fg.

Wednesday night: mainly ifr, with local MVFR possible. Breezy.

Ra likely, tapering off to shra. Isolated tsra possible. Patchy
fg.

Thursday: mainlyVFR, with local MVFR possible. Breezy. Slight
chance shra.

Thursday night through Friday:VFR.

Friday night through Saturday:VFR. Slight chance shra.

Marine
Forecaster confidence levels...

low - less than 30 percent.

Moderate - 30 to 60 percent.

High - greater than 60 percent.

Short term through Tuesday night ... High confidence.

Tonight...

high pressure over the waters tonight with south winds 10 kt or
less, seas 1 to 2 feet on the outer coastal waters. Good
visibility. Only concern for recreational boaters continues into
early this evening is for sea breezes along the coastline today with
15-20kt gusts and choppy seas near shore, especially when opposing
outgoing tide.

Tuesday...

south wind increasing over the course of the day to 10 to 20 kts.

Sea breeze along east coastal ma possible late morning midday, then
s winds should prevail as they strengthen. Seas 1 to 3 feet.

Tuesday night... Se winds less than 25 kt. Seas locally approaching
5 ft, especially on the southern outer coastal waters. Sca
headlines may be needed. Rain showers becoming likely towards
daybreak.

Outlook Wednesday through Saturday ... High confidence.

Wednesday: moderate risk for small craft advisory winds with
gusts up to 30 kt. Areas of rough seas. Rain, isolated
thunderstorms, patchy fog. Areas of visibility 1 nm or less.

Wednesday night: low risk for small craft advisory winds with
gusts up to 30 kt. Rough seas up to 13 ft. Rain likely, chance
of rain showers, isolated thunderstorms, patchy fog. Local
visibility 1 nm or less.

Thursday: low risk for small craft advisory winds with gusts up
to 25 kt. Rough seas up to 10 ft. Slight chance of rain
showers.

Thursday night: winds less than 25 kt. Areas of rough seas.

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

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

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

Equipment
The NOAA weather radio transmitter serving providence is out of
service due to phone line problems. The phone company has
prioritized the issues and is working to get the weather
broadcast back on the air as soon as possible. The transmitter
serving hyannis is back in service.

Box watches warnings advisories
Ct... None.

Ma... None.

Ri... None.

Marine... None.

Synopsis... Belk nmb
near term... Nmb
short term... Nmb
long term... Belk
aviation... Belk nmb
marine... Belk nmb
equipment... Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 12 mi69 min ESE 7.8 G 9.7 46°F 45°F1031.2 hPa (-0.8)41°F
NTKM3 - 8449130 - Nantucket Island, MA 20 mi41 min SSE 5.1 G 8 51°F 51°F1031.8 hPa
44090 24 mi29 min 46°F
WAXM3 - Waquoit Bay Reserve, MA 25 mi74 min 2.9 53°F 1032 hPa30°F
BZBM3 - 8447930 - Woods Hole, MA 33 mi41 min 50°F 46°F1031.7 hPa

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA10 mi67 minSSE 310.00 miFair51°F25°F36%1031.8 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA14 mi63 minSSE 710.00 miFair52°F27°F38%1030.9 hPa
Nantucket, Nantucket Memorial Airport, MA21 mi66 minSE 710.00 miFair48°F36°F63%1031.5 hPa

Wind History from CQX (wind in knots)
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Last 24hrS3S3SW4SW54SW5SW4CalmCalmCalmN4N4N3N6NE9NE8NE8NE9E9NE9E8E7SE6SE3
1 day agoSW5SW6SW7SW4SW3NW3NW3NW4CalmCalmNW4NW4NW45NW856NW7NW75E7E5S5S5
2 days agoNW4NW7
G18
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6NW6NW5NW6NW7NW7
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N8Calm5S7S7

Tide / Current Tables for Monomoy Point, Cape Cod, Massachusetts
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Monomoy Point
Click for Map
Mon -- 12:06 AM EDT     0.32 feet Low Tide
Mon -- 02:21 AM EDT     Moonset
Mon -- 05:48 AM EDT     Sunrise
Mon -- 06:28 AM EDT     4.05 feet High Tide
Mon -- 12:36 PM EDT     Moonrise
Mon -- 12:48 PM EDT     -0.04 feet Low Tide
Mon -- 07:16 PM EDT     3.67 feet High Tide
Mon -- 07:29 PM EDT     Sunset
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
0.30.51.222.83.6443.52.71.80.90.2-00.311.72.63.33.63.63.12.41.5

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Mon -- 12:40 AM EDT     1.62 knots Max Flood
Mon -- 02:21 AM EDT     Moonset
Mon -- 03:57 AM EDT     -0.00 knots Slack
Mon -- 05:48 AM EDT     Sunrise
Mon -- 06:36 AM EDT     -1.61 knots Max Ebb
Mon -- 09:48 AM EDT     0.00 knots Slack
Mon -- 12:36 PM EDT     Moonrise
Mon -- 01:22 PM EDT     1.91 knots Max Flood
Mon -- 04:45 PM EDT     -0.00 knots Slack
Mon -- 07:23 PM EDT     -1.53 knots Max Ebb
Mon -- 07:29 PM EDT     Sunset
Mon -- 10:38 PM EDT     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.
12am1am2am3am4am5am6am7am8am9am10am11am12pm1pm2pm3pm4pm5pm6pm7pm8pm9pm10pm11pm
1.61.61.40.8-0.1-1-1.5-1.6-1.2-0.60.211.61.91.91.50.7-0.3-1.1-1.5-1.5-1.1-0.50.3

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.
target = "new">Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (18,4,5,8)
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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.