Thursday, April2, 2020
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Marine Weather and Tides
Harwich Port, MA

Version 3.4
NOTICE
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:19AMSunset 7:09PM Thursday April 2, 2020 3:05 PM EDT (19:05 UTC) Moonrise 12:35PMMoonset 3:07AM Illumination 73% Phase: Waxing Gibbous; Moon at 10 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- 116 Pm Edt Thu Apr 2 2020
.storm warning in effect from late tonight through Friday evening...
This afternoon..NW winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 5 ft. Rain. Vsby 1 to 3 nm.
Tonight..N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 7 ft. Areas of fog. Rain. Vsby 1 nm or less.
Fri..NE winds 25 to 30 kt with gusts up to 45 kt. Seas 4 to 7 ft. Areas of fog. Rain. Vsby 1 to 3 nm.
Fri night..NE winds 25 to 30 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 40 kt. Seas 4 to 7 ft. Areas of fog. Rain likely. Vsby 1 to 3 nm.
Sat..NE winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 7 ft. A chance of rain.
Sat night..NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 3 to 5 ft.
Sun..E winds around 5 kt. Seas 3 to 5 ft.
Sun night..SW winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers.
Mon and Mon night..W winds 5 to 10 kt. Seas 2 to 4 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 116 Pm Edt Thu Apr 2 2020
Synopsis for massachusetts and rhode island coastal waters.. A large and intense ocean storm well east of the waters will gradually pinwheel back toward the coast through tonight before moving S the waters Fri into Fri night. This storm will bring gale to storm force winds to the waters tonight and Fri. High pres will build over the waters during the weekend. 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 021439 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1039 AM EDT Thu Apr 2 2020

SYNOPSIS. A large and intense ocean storm well southeast of New England will pinwheel back toward the coastline tonight and Friday. This storm will bring strong to possibly damaging winds and coastal flooding to east coastal Massachusetts, especially Cape Cod and the Islands. In addition, periods of rain will fall heavily at times across the area through Friday, then will linger into Saturday morning. A slow moving, weak front will bring scattered showers late Saturday night through Sunday night. Unsettled conditions will linger at times into mid week.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

Low pressure centered well south of Yarmouth Nova Scotia with a tightening pressure gradient west to Cape Cod. Upper flow shows vertical low pressure in the same position with an east flow across the Gulf of Maine and the Maine coast, turning from the north and northwest over Southern New England.

Satellite shows clouds patchy over the East Slopes and SW Hartford County, but the cloud shield continues to drift west. Radar shows light echoes over Eastern and Central MA, NE CT, and RI. Patchy but more substantial echoes over Ipswich Bay and Cape Cod Bay moving southwest.

Expect these trends to continue through the afternoon. Mostly sprinkles, but with a more substantial light rain moving ashore. Temperatures in the upper 30s and 40s will linger in this range through the afternoon.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/. Tonight into Friday .

Large ocean storm retrogrades back to the west making its closest approach to SNE Fri morning as it passes just SE of the 40N/70W benchmark before continuing to move southward during Fri. Bands of rain will continue to move from east to west from the ocean, focused across eastern MA along the nose of an intensifying low level jet. Occasional bands of heavier rainfall are likely along east coastal MA.

Strong to damaging winds will be a concern along east coastal MA and especially Cape Cod and the Islands late tonight into Fri. Low level jet 50-55 kt moves in from the Gulf of Maine to the SNE coastline. Soundings show a shallow but sufficiently mixed boundary layer suggesting much of this wind will mix down to the surface. We converted the high wind watch for the Cape/Islands to a warning for gusts to 60 mph, and issued a wind advisory for east coastal MA for gusts to 50 mph.

See coastal flooding section below for a discussion of coastal flood potential.

LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/. Highlights .

* Area of rain will linger across central and eastern areas Friday night, along with strong wind gusts, then will gradually shift offshore during Saturday

* Mainly dry conditions late Saturday into Sunday morning as weak high pressure crosses

* A weak disturbance and approaching cold front may bring scattered showers Sunday afternoon into Sunday night

* Dry, seasonable conditions briefly return Monday

* Unsettled conditions will linger at times Monday night through mid week as weak systems move across

Details .

Friday night and Saturday .

With the high amplitude blocking mid level pattern in place, the strong ocean storm well SE of Cape Cod will turn S Fri night, then will shift offshore during Saturday. Will see the strong northerly winds continue along E coastal areas with gusts up to 25 to 35 kt and potentially up to around 40 kt across the mid and outer Cape as well as on Nantucket Fri night. The tight pressure gradient starts to weaken as the storm shifts further SE during the night. So, should see winds start to gradually diminish but the higher gusts will linger across the Cape and islands, possibly up the coast to around Plymouth and Marshfield.

The 00Z models continue to show rather wide solution spread into Saturday, with some keeping the western edge of the precip lingering across eastern areas early. However, some members are trying to wrap some drier air around this fringe, including the GGEM and ECMWF. Noting some weak ridging trying to shift S out of northern New England, which could help with some subsidence and drying air to push the precip to the S and SE during Saturday. At this point, have patchy showers lingering Sat morning across E Mass into RI, but should taper off by midday. Clouds will linger into the afternoon, but may see some partial clearing well inland late in the day.

Temps on Saturday will remain chilly along the coast with highs only in the lower 40s, but could see readings reach the lower- mid 50s well across central and western areas, mildest across the CT valley.

Saturday night into Sunday .

As the ocean storm moves further offshore, will see high pressure ridge build slowly E Sat night. However, some model members try to bring another weak disturbance across the interior during the night, which may bring a few showers. As the northern stream mid level steering flow becomes nearly zonal late this weekend, another cold front will push toward the region with another round of showers.

With a generally light W-NW surface wind flow in place, could see temps begin to slowly moderate. Highs on Sunday should rise through the 50s, but will remain cooler across Cape Ann and Cape Cod. Readings could reach the upper 50s across the lower CT valley before the showers arrive later in the day.

Monday through Wednesday .

With the fast moving H5 steering flow in place, will see weather systems move across the lower 48 rather quickly. Still noting quite a bit of model solution spread, so will see a quite a bit of spread with the timing and track of individual systems.

Overall, should see dry conditions and mild temperatures on Monday as weak high pressure moves across. Highs will run up to 5 to 10 degrees above normal for early April, with readings topping off from the lower-mid 50s across the Cape and islands as well as the higher inland terrain to the lower-mid 60s across the mid and lower CT valley as well as interior E Mass into RI and NE CT.

Next system approaches Monday night into Tuesday morning, but appears best shot for showers may occur mainly south of the Mass Pike. Rather disorganized systems move along in the nearly zonal steering flow out of the Great Lakes and Ohio valley. Strong low pressure will push across central Ontario into Quebec, with a trailing front that could bring another around of precip by late Tuesday night that may linger into Wednesday.

AVIATION /14Z THURSDAY THROUGH MONDAY/. Forecaster Confidence Levels .

Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.

This afternoon . Moderate confidence.

VFR in Central and Western areas, with MVFR CIGS and sprinkles/light rain across eastern MA and part of RI. This will continue to move slowly west across SNE this afternoon, reaching the CT valley mid/late afternoon. Conditions will lower to MVFR and local IFR across E coastal areas during the afternoon. Areas of IFR across Cape/Islands. N-NW winds gusting up to 25 kt, except up to 35 kt over Cape Cod and Islands.

Tonight . Moderate confidence. Widespread MVFR in periods of rain with areas of IFR along the coast and in the high terrain. N wind gusts to 25 kt along the immediate coast and up to 35 kt over Cape/Islands, with gusts increasing to 40-45 kt toward daybreak Cape/Islands.

Friday . Moderate confidence. MVFR/IFR conditions in periods of rain. NE gusts 40-50 kt Cape/Islands and 30-40 kt east coastal MA into SE MA and coastal RI.

KBOS Terminal . Overall moderate confidence. Mainly MVFR cigs in periods of light rain although can't rule out IFR toward evening and tonight along with vsby restrictions.

KBDL Terminal . High confidence in trends, but lower confidence on exact timing. VFR trending to MVFR CIGS this evening and tonight.

Outlook /Friday Night through Monday/ .

Friday Night: MVFR/IFR conditions possible. Strong winds with areas of gusts up to 40 kt. Chance RA.

Saturday: Mainly VFR, with local IFR possible. Windy with local gusts up to 30 kt.

Saturday Night: Mainly VFR, with local IFR possible. Breezy.

Sunday: Mainly VFR, with local IFR possible. Slight chance SHRA.

Sunday Night: Mainly VFR, with areas MVFR possible. Slight chance SHRA.

Monday: VFR.

MARINE. Large ocean storm retrogrades back toward the eastern waters bringing strong winds and seas. Storm force gusts to 50 kt expected over eastern waters with gusts to 40 kt over RI coastal waters. Peak of the wind will be late tonight into Fri as the storm makes its closest approach. Storm warnings and gale warnings are in place. Seas will build to 20-25 ft east of Cape Cod and Nantucket. Vsbys reduced in period of rain and fog.

Outlook /Friday Night through Monday/ .

Friday Night: Moderate risk for gale force winds with gusts up to 40 kt. Rough seas up to 20 ft. Chance of rain, chance of rain showers.

Saturday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 16 ft. Slight chance of rain showers.

Saturday Night: Winds less than 25 kt. Rough seas up to 13 ft.

Sunday: Winds less than 25 kt. Rough seas up to 9 ft.

Sunday Night: Winds less than 25 kt. Areas of rough seas. Chance of rain showers.

Monday: Winds less than 25 kt. Local rough seas.

TIDES/COASTAL FLOODING.

This afternoon and evening . Seas subsiding after cresting near 5 feet at Nantucket during the morning. Reports of minor splashover.

Expect rising seas this evening with the secondary high tide. Total water levels are expected similar or a little lower than this morning. This suggests some more minor splashover possible at Nantucket, while the remainder of the coast remains free of these effects.

Friday . The main concern is the Friday morning high tide for all of east coastal MA as the core of strong winds and seas will occur around this time. A storm surge up to 3 ft is expected per Stevens Institute surge ensembles. In addition greater wave action expected as well with 20+ ft seas ocean waters east of Nantucket and Cape Cod and up to 15 ft around Boston Buoy. These dangerous seas will be long period/high energy waves. Based on forecast storm tide and wave action, widespread minor flooding expected along the entire east coast of MA, with risk for moderate flooding at Nantucket. As a result we issued a coastal flood warning for Nantucket with an advisory elsewhere along east coastal MA.

Tides are about a little less than a foot lower for the Fri evening high tide and surge and seas will also be a bit lower. As a result not expecting much flooding for the Fri evening high tide, except pockets of minor flooding are possible for Nantucket.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Coastal Flood Advisory from 6 AM to 10 AM EDT Friday for MAZ007-015-016-019-022-023. Wind Advisory from 5 AM to 8 PM EDT Friday for MAZ007-019-021. High Wind Warning from 5 AM to 8 PM EDT Friday for MAZ022>024. Coastal Flood Warning from 6 AM to 10 AM EDT Friday for MAZ024. Coastal Flood Advisory until 10 AM EDT this morning for MAZ024. RI . None. MARINE . Storm Warning from 5 AM to 8 PM EDT Friday for ANZ231-232-250- 254-255. Gale Warning from 5 AM Friday to 2 AM EDT Saturday for ANZ233- 234. Gale Warning from 5 AM to 8 PM EDT Friday for ANZ230-236. Gale Warning from 5 AM Friday to 6 AM EDT Saturday for ANZ235- 237. Gale Warning from 3 AM Friday to 6 AM EDT Saturday for ANZ251- 256.

SYNOPSIS . KJC/EVT NEAR TERM . WTB/KJC/EVT SHORT TERM . KJC LONG TERM . EVT AVIATION . WTB/KJC/EVT MARINE . WTB/KJC/EVT TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 13 mi265 min 3 ft
NTKM3 - 8449130 - Nantucket Island, MA 20 mi257 min N 15 G 24 42°F 44°F998.1 hPa
44090 24 mi245 min 43°F6 ft
WAXM3 - Waquoit Bay Reserve, MA 25 mi320 min WNW 8.9 42°F 999 hPa38°F
BZBM3 - 8447930 - Woods Hole, MA 33 mi257 min 44°F 44°F998.8 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 44 mi255 min NNW 25 G 29 40°F 10 ft997.5 hPa (-1.1)37°F

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA10 mi13 minNNW 9 G 256.00 miLight Rain Fog/Mist43°F39°F86%996 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA14 mi9 minNNW 15 G 286.00 miLight Rain Fog/Mist44°F39°F85%995.5 hPa
Nantucket, Nantucket Memorial Airport, MA21 mi12 minNNW 21 G 3110.00 miLight Rain and Breezy44°F41°F89%995.9 hPa

Link to 5 minute data for KCQX

Wind History from CQX (wind in knots)
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Tide / Current Tables for Monomoy Point, Cape Cod, Massachusetts
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Monomoy Point
Click for Map
Thu -- 12:47 AM EDT     0.71 feet Low Tide
Thu -- 03:07 AM EDT     Moonset
Thu -- 06:20 AM EDT     Sunrise
Thu -- 07:06 AM EDT     3.68 feet High Tide
Thu -- 12:34 PM EDT     Moonrise
Thu -- 01:30 PM EDT     0.33 feet Low Tide
Thu -- 07:07 PM EDT     Sunset
Thu -- 07:54 PM EDT     3.29 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.80.711.72.32.93.43.73.532.31.50.90.40.40.81.422.63.13.33.12.51.9

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Thu -- 01:34 AM EDT     1.44 knots Max Flood
Thu -- 03:07 AM EDT     Moonset
Thu -- 04:55 AM EDT     -0.00 knots Slack
Thu -- 06:20 AM EDT     Sunrise
Thu -- 07:32 AM EDT     -1.45 knots Max Ebb
Thu -- 10:41 AM EDT     0.00 knots Slack
Thu -- 12:34 PM EDT     Moonrise
Thu -- 02:11 PM EDT     1.74 knots Max Flood
Thu -- 05:40 PM EDT     -0.00 knots Slack
Thu -- 07:07 PM EDT     Sunset
Thu -- 08:13 PM EDT     -1.40 knots Max Ebb
Thu -- 11:25 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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1.11.41.41.20.7-0.1-0.9-1.4-1.4-1.1-0.50.211.51.71.71.30.6-0.3-1.1-1.4-1.3-0.9-0.3

Weather Map
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GEOS 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 (15,3,4,5)
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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 numerous 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.