Friday, April10, 2020
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Marine Weather and Tides
West Chatham, 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 6:06AMSunset 7:17PM Friday April 10, 2020 3:33 PM EDT (19:33 UTC) Moonrise 10:39PMMoonset 7:56AM Illumination 91% Phase: Waning Gibbous; Moon at 18 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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ANZ254 Coastal Waters From Provincetown Ma To Chatham Ma To Nantucket Ma Out 20 Nm- 116 Pm Edt Fri Apr 10 2020
.gale warning in effect through late tonight...
This afternoon..W winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft, except 10 to 14 ft S and E of nantucket. A slight chance of showers.
Tonight..NW winds 20 to 25 kt with gusts up to 40 kt, diminishing to 15 to 20 kt with gusts up to 30 kt after midnight. Seas 6 to 9 ft, except 8 to 13 ft S and E of nantucket.
Sat..W winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft.
Sat night..W winds 10 to 15 kt with gusts up to 25 kt, diminishing to 5 to 10 kt after midnight. Seas 3 to 5 ft.
Sun..SW winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft.
Sun night..S winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 4 to 7 ft.
Mon..S winds 25 to 30 kt with gusts up to 55 kt. Seas 8 to 11 ft. Showers with a chance of tstms.
Mon night..SW winds 30 to 35 kt with gusts up to 55 kt. Seas 9 to 14 ft. Showers likely with a chance of tstms.
Tue..W winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 9 ft, except 9 to 13 ft S and E of nantucket.
Tue night..W winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 8 ft. 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 Pm Edt Fri Apr 10 2020
Synopsis for massachusetts and rhode island coastal waters.. Powerful low pressure over nova scotia Friday will slowly lift north farther inland through Saturday. High pressure moves south of new england Sunday. Then Monday another powerful low enters the great lakes with southerly gales likely and possibly storm force gusts over the ma and ri waters. 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 West Chatham, MA
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location: 41.73, -69.97     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 101742 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 142 PM EDT Fri Apr 10 2020

SYNOPSIS. Powerful low pressure over Nova Scotia will maintain cool and blustery weather across southern New England this afternoon, along with scattered showers. Dry weather Saturday but remaining cool and brisk. High pressure south of New England provides milder temperatures for Sunday with highs 55-60. Powerful low pressure then tracks thru the Great Lakes Monday with heavy showers and strong winds to impact southern New England. Dry and seasonable weather returns Tuesday.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

130 pm update .

Considerable cloudiness across the area with scattered rain showers across the area, except more numerous rain/snow showers extending over the Berkshires into the east slopes. Have increased POPs to chance for most of the area, except likely to categorical pops along the east slopes of the Berkshires and far NW Hartford County. Some showers in the area may produce a brief period of small graupel. In the highest terrain of NW MA, we could still have some snow showers, though accumulations are expected to be limited to a few tenths of an inch or less.

The cold pool aloft, wrap around moisture, and lake effect moisture will allow this weather to persist thru the remainder of this afternoon, starting to diminish towards sunset.

Wind gusts 25 to 40 mph expected to continue through this afternoon, just shy of Wind Advisory. Exception is over Block Island, Nantucket and Martha's Vineyard, where a Wind Advisory continues for gusts to 50 mph.

Early Morning Discussion follows .

Today .

Mainly dry conditions this morning with just some lake effect rain/snow showers from NY state spilling over the Berkshires and Litchfield Hills into the CT river valley. Impressive cold pool of -36C at 500 mb streaming S-SW of New England and yielding scattered rain showers currently across northern NJ/NYC into western LI. This activity will track south of New England this morning. As this cold pool moves offshore, wrap around moisture and warmer air aloft (TROWAL) pivoting cyclonically around mid level low into southern New England this afternoon. Thus expect morning sunshine to give way to afternoon clouds and scattered rain showers with scattered snow showers over the high terrain. Not a wash out but definitely have to dodge a few chilly showers/sprinkles this afternoon and early evening.

Cool temps aloft (-5C at 850 mb) combined with mostly cloudy conditions this afternoon will limit highs to 45-50, low 40s in the high terrain. Normal high for April 10th is 52-58, so a few degs cooler than normal but it will feel even cooler given brisk west winds today sustained 15 mph but gusting 25-35 mph at times. Strongest winds will be across the Islands given stronger wind fields aloft and deeper boundary layer with gusts up to 50 mph at times. Therefore have posted a Wind Advisory for Block Island, Marthas Vineyard and Nantucket.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/. Tonight .

Any leftover sprinkles/light rain showers (light snow showers high terrain) during the early evening will move offshore and give way to dry weather. CAA continues with 850 mb temps lowering to about -7C. Lows will be in the 30s but a NW breeze will yield wind chills in the 20s. Strongest NW winds over Cape Cod and Islands with gusts up to 30 mph.

Saturday .

Another northern stream trough moves across the area in the morning but its cold pool remains north of region over northern VT/NH into ME. Thus column not as cold and drier than today. As a result more sunshine Saturday than today yielding temperatures a few degs warmer with highs in the low 50s. Not quite as windy as well with WNW winds 10-15 mph with gusts up to 25 mph. So overall some improvement and more pleasant than today.

LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/. Highlights .

* Temperatures running near to below normal Saturday, then a warm up Sunday-Tuesday

* Rain, thunderstorms, and gusty winds on Monday

* Drier and cooler through mid week

Details .

Saturday night and Sunday .

The ridge axis moves overhead Saturday night bringing light winds, clear skies, and efficient radiational cooling. MOS guidance has been given more weight with the low temperatures for this reason; we're looking at most interior locations dipping to near or below freezing.

By Sunday on the back side of the ridge warm SW flow advects in milder air and mid/upper level moisture. So, while clouds will be on the increase through the day, temperatures will be quite a bit warmer than Saturday, in the upper 50s . closer to the low 60s for the CT Valley. The exception, as per usual, will be the Cape and islands where southerly flow off the ocean keeps temps in the low 50s. Also on Sunday a modest 25-35 kt LLJ moves overhead. Given WAA at the sfc, the BL should be well mixed to near 800 mb leading to wind gusts of 25 to 35 mph at the surface. Overall, a mild, partly cloudy, and breezy end to the weekend.

Sunday night and Monday .

Late Sunday night and Monday our next strong storm system will impact southern New England bringing widespread heavy rain, strong winds, and thunderstorms. At the synoptic scale we see the merging to two distinct disturbances; one, a cutoff low spinning over the desert southwest all weekend which is finally pulled into the steering flow Sunday and eventually phases with a digging trough over the northern Plains, lifting through the Great Lakes on Monday. This will be a very strong and expansive system. Global guidance progs the sfc MSLP around 992 mb at 00Z Monday and by 00Z Tuesday its around or sub 970 mb. Jet dynamics are very strong as a result . 850mb jet of 80-90 kts! GEFS ensemble guidance shows v (southerly) component of the jet at 5-6 standard deviations above normal. The EC isn't quite as bullish, but still very strong. Regardless of the exact values, this together with a large moisture plume (PWATs near 1.5" and dewpoints in the upper 50s) and cold frontal forcing will bring widespread heavy rain to the region starting Monday morning and exiting by the early hours of Tuesday. While model soundings show enough of a slight inversion to keep the very strong winds aloft as a whole, heavy downpours could bring strong to damaging winds from aloft down to the surface. Convection likely makes a return as well, with modest elevated instability (200- 500 J/kg CAPE) and strong shear (50-60 kts 0-6 km bulk shear). Thunderstorm chances increase late Monday morning in western MA/CT and move east through the day. The cold front then moves through Monday night into Tuesday morning ushering in a drier and cooler airmass. Rainfall totals look to be from 0.5-1.0" with locally higher amounts possible under heavy downpours.

Tuesday through Thursday .

The low pressure exits into Quebec by daybreak on Tuesday leaving us under a broad east coast trough through mid week. At the surface high pressure edges its way east into the areas helping keep precip away, and suppressing a storm system to our south over the Atlantic on Wednesday. Overall a dry period is expected with the return of cooler temperatures, down into the low 50s by Wednesday. Tuesday will be dry but windy as CAA aids in mixing down some gusty west winds, generally 20-30 mph. By Thursday another trough brings our next shot of rain to the region.

AVIATION /18Z FRIDAY THROUGH WEDNESDAY/. Forecaster Confidence Levels .

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

18z update .

Today .

Mainly VFR BKN this afternoon, with scattered light rain showers (snow showers interior high terrain). Patchy MVFR CIGs/VSBYs in light rain showers possible. Some locales may see a brief period of small graupel. W/WNW winds 15-25 kts with gusts up to 35 kts, except up to 40 kts across the Islands.

Tonight .

Marginal MVFR/VFR with scattered evening rain showers (snow showers western high terrain) then drying trend late evening and overnight. NW winds 10-15 kt gusting to 25kt then diminishing overnight except remaining windy over Cape Cod and Islands.

Saturday .

WNW winds 10-15 kt gusting to 25 kt. Dry with VFR diurnal clouds.

KBOS Terminal . high confidence in the TAF.

KBDL Terminal . high confidence in the TAF.

Outlook /Saturday Night through Tuesday/ .

Saturday Night: VFR.

Sunday: VFR. Breezy.

Sunday Night: Mainly VFR, with local MVFR possible. Breezy. Chance SHRA.

Monday: Mainly VFR, with local IFR possible. Strong winds with gusts up to 50 kt. SHRA likely, chance TSRA.

Monday Night: Mainly VFR, with local MVFR possible. Strong winds with gusts up to 50 kt. Chance SHRA.

Tuesday: VFR. Breezy.

MARINE. Today thru Saturday .

*** Gale Warnings Remain Posted ***

Powerful low pressure over Nova Scotia slowly weakens and moves farther inland with time. NW winds 15-20 kt with gusts 30 to 40 kt then not quite as strong tonight and Saturday, perhaps subgale force. Other than a few scattered rain showers this afternoon and evening, mainly dry weather and good vsby prevail.

Outlook /Saturday Night through Tuesday/ .

Saturday Night through Sunday: Winds less than 25 kt. Seas locally approaching 5 ft.

Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Chance of rain showers.

Monday: Low risk for storm force winds with gusts up to 50 kt. Rough seas up to 18 ft. Rain showers, chance of thunderstorms.

Monday Night: Low risk for gale force winds with gusts up to 45 kt. Rough seas up to 18 ft. Chance of rain showers.

Tuesday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 12 ft.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Wind Advisory until 8 PM EDT this evening for MAZ023-024. RI . Wind Advisory until 8 PM EDT this evening for RIZ008. MARINE . Gale Warning until 8 PM EDT this evening for ANZ231-232-251. Gale Warning until 3 AM EDT Saturday for ANZ233>235-237-250- 254>256. Gale Warning until 7 PM EDT this evening for ANZ230-236.

SYNOPSIS . Nocera/BW NEAR TERM . Nocera/BW/NMB SHORT TERM . Nocera LONG TERM . BW AVIATION . Nocera/BW/NMB MARINE . Nocera/BW/NMB


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTM3 3 mi75 min W 8.9 G 22 48°F 49°F987.8 hPa
44090 20 mi33 min 43°F3 ft
44020 - NANTUCKET SOUND 23 mi53 min 4 ft
NTKM3 - 8449130 - Nantucket Island, MA 31 mi45 min W 11 G 24 44°F 46°F990.2 hPa
WAXM3 - Waquoit Bay Reserve, MA 31 mi108 min WSW 8 47°F 989 hPa24°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 34 mi43 min WSW 18 G 21 44°F 5 ft986.4 hPa (+0.3)28°F
BZBM3 - 8447930 - Woods Hole, MA 40 mi45 min 46°F 46°F989.7 hPa

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA2 mi41 minW 12 G 2610.00 miMostly Cloudy49°F24°F38%988.5 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA17 mi37 minW 16 G 2610.00 miOvercast49°F25°F39%988 hPa
Provincetown Municipal Airport, MA23 mi37 minW 18 G 2310.00 miOvercast and Breezy49°F32°F52%987.7 hPa

Link to 5 minute data for KCQX

Wind History from CQX (wind in knots)
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1 day agoN8NE11NE5N3CalmSE4CalmS3CalmCalmSE4S4S55S5S7S5S10
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2 days agoSE7SE7S5SW5SW6SW4SW6SW6SW4SW4SW4SW5S4NW5CalmCalmNE3NE3NE4NE7NE5NE56NE7

Tide / Current Tables for Pleasant Bay, Quonset Pont, Massachusetts
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Pleasant Bay
Click for Map
Fri -- 03:58 AM EDT     4.06 feet High Tide
Fri -- 06:07 AM EDT     Sunrise
Fri -- 07:55 AM EDT     Moonset
Fri -- 10:54 AM EDT     -0.69 feet Low Tide
Fri -- 04:29 PM EDT     3.73 feet High Tide
Fri -- 07:15 PM EDT     Sunset
Fri -- 10:39 PM EDT     Moonrise
Fri -- 11:13 PM EDT     -0.33 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.41.52.73.74.13.732.21.30.4-0.4-0.7-0.30.61.833.63.73.22.41.70.90.1-0.3

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Fri -- 02:13 AM EDT     -2.19 knots Max Ebb
Fri -- 05:21 AM EDT     0.00 knots Slack
Fri -- 06:07 AM EDT     Sunrise
Fri -- 07:56 AM EDT     Moonset
Fri -- 08:40 AM EDT     2.43 knots Max Flood
Fri -- 11:56 AM EDT     -0.00 knots Slack
Fri -- 02:39 PM EDT     -2.16 knots Max Ebb
Fri -- 05:50 PM EDT     0.00 knots Slack
Fri -- 07:15 PM EDT     Sunset
Fri -- 09:05 PM EDT     2.27 knots Max Flood
Fri -- 10:39 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.7-1.7-2.2-2-1.4-0.40.81.82.32.421.2-0.1-1.3-2-2.1-1.7-0.90.21.322.32.11.4

Weather Map
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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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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.