Monday, August3, 2020
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Marine Weather and Tides
Yarmouth 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 5:36AMSunset 7:57PM Monday August 3, 2020 2:01 PM EDT (18:01 UTC) Moonrise 8:23PMMoonset 5:15AM Illumination 100% Phase: Full Moon; Moon at 14 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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ANZ231 Cape Cod Bay- 123 Pm Edt Mon Aug 3 2020
.tropical storm warning in effect...
This afternoon..SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Tonight..SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft.
Tue..S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft.
Tue night..S winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. A chance of showers. Vsby 1 to 3 nm.
Wed..SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers.
Wed night..SW winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft.
Thu through Fri night..SE winds 5 to 10 kt. Seas around 2 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 123 Pm Edt Mon Aug 3 2020
Synopsis for massachusetts and rhode island coastal waters.. With high pressure sitting east of the waters our main focus will turn to tropical storm isaias as our region remains in the cone of uncertainty Tue into early Wed. Mariners are urged to visit www.nhc.noaa.gov for the latest forecasts regarding this storm. High pres will build back across the waters Wed into Thu. 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 Yarmouth Port, MA
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location: 41.71, -70.29     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 031751 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 151 PM EDT Mon Aug 3 2020

SYNOPSIS. Dry, quiet and warm across southern New England today. Showers and a few thunderstorms developing early Tuesday from southwest to northeast ahead of Isaias. Isaias is expected to impact southern New England Tuesday night with heavy rain in western areas and gusty winds in eastern areas. Heading into late week, temperatures remain warm, but more comfortable with lowering dewpoints.

NEAR TERM /UNTIL 6 PM THIS EVENING/. 145 pm update .

quiet day -- but warm and a bit on the humid side. A bit of a low level jet that we've tapped into, so the winds are a bit gusty out there as well. Temperatures well into the 80s and lower 90s. Otherwise, really no concerns for the rest of the afternoon.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/. As of 145 pm .

Will talk more in a later AFD, but in general not seeing anything major in the way of changes as Isaias makes it's way up the coast. Primary thing for tonight will be the development of fog and low clouds across the Cape and Islands as a very humid airmass continues to move into the region. Otherwise since we are within 30 hours of Isaias, the Watches were converted to Warnings a little bit earlier.

Previous discussion below .

Monday night through Tuesday morning .

Moisture advecting into southern New England ahead of Isaias as the mid level ridge axis builds into the Gulf of Maine. This will shift flow from southwest to south southwest. Will see PWATS increase to roughly 1.5 to 2 in depending on the forecast guidance. This will also be roughly in the RRQ of a 250 hPa 95+ kt jet and the stalled out front over the region. This will bring showers and perhaps a few thunderstorms. Best shot for thunderstorms is along the south coast of RI/CT. The thunderstorm risk spreads northward into northern CT, RI, central and eastern MA Tuesday morning. Some of these showers/storm could be heavy at times given the tropical airmass advecting in.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/. Highlights .

* Tropical Storm Isaias will move into the New England region around Tuesday night into early Wednesday bringing rain and gusty winds. Minor coastal flooding is possible along with increased rip current risk and high surf.

* The biggest rain threat will be in western MA/CT or even west of New England, in eastern NY. Main threat would be urban flooding. Strong winds are possible with gusts 45-55 mph and localized gusts up to 60 mph. Axis of heavy rain and winds will be contingent on the eventual track of the system.

* High pressure and dry weather move in for the latter half of the week into the weekend with seasonable temperatures.

Details .

Tropical Storm Isaias is currently spinning off the coast of Florida, but should be arriving in/near southern New England around Tuesday afternoon/Tuesday night. 00Z ECMWF guidance has come in with a track further west and in agreement with the GFS/NAM solution taking the low center up the MA/NY border. Should this outcome materialize, the change in impacts would be 1) a further shift west in the heaviest rainfall/urban flooding risk - into eastern NY but potentially as far east as the Berkshires 2) potential for those 45- 60 mph wind gusts over most all of southern New England. Fortunately, the storm will be accelerating and weakening as it moves up the east coast so it won't be a long duration event. However, as it undergoes a transition to an extratropical system the wind fields will be expanding. Another concern during the evening into overnight Tuesday will be the potential for isolated tornadoes. Timing of course would change if the storm's arrival time changes. Several hundred J/kg CAPE will provide plenty of instability together with a ton of 0-6 km effective shear for sustained updrafts. Add on top of it some serious low level spinning (0-1 km shear of 50 kts and 0-1 km SRH over 500[!] m2s2) and we'll have to keep an eye on any storms that get going. The storm lifts out and a dry slot moves in bringing a quick end to the rain on Wednesday, though the rough seas will linger into Thursday. The latter half of the week is much drier as high pressure moves in under rising mid level heights. Highs remain in the 80s through the weekend.

Impacts of Isaias .

Of course the magnitude of any impacts at this point remains+ uncertain, depending on the eventual track and strength over southern New England. At this point the main concern for potential heavy rain in MA/CT (2-4", locally 6") is over the the Berkshires. Whether the axis of heaviest rainfall sets up here or further west into NY will determine if we deal with any urban flooding issues. Winds gusting 45-55 mph with localized gusts to 60 mph are possible which, given the leaves on our trees (compared to, say, a Noreaster in January) could cause some serious power outage issues from downed trees and wires. A much less likely but real threat is damage from tornadoes, especially late Tuesday into Tuesday night based on current timing. At this point, expecting that any coastal flooding would be minor, along the south coast. High surf and rip current risk will be elevated Tuesday and Wednesday. Wednesday may see the highest impact when it comes to rip current risk given that it would be the better beach day, post Isaias.

AVIATION /18Z MONDAY THROUGH SATURDAY/. Forecaster Confidence Levels .

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

18Z update .

Rest of Today . High confidence

VFR with WSW to W winds. Winds become gusty during the afternoon.

Tonight . Moderate confidence

VFR initially. IFR expected to develop across the Cape and Islands due to low ceilings and fog. Potential for scattered showers to develop after 06z or so across far western MA and northern CT. Kept to mainly VCSH in the TAFs.

Tuesday . Moderate confidence

Expecting ceilings to lower throughout the day, with MVFR becoming common at most TAF sites. Chances for showers or thunderstorms increase, especially western sections (eg: BDL, BAF). Isaias will be rapidly approaching in the 18z-00z timeframe, and expecting the winds to quickly ramp up during that period.

KBOS Terminal . Moderate confidence in TAF.

KBDL Terminal . Moderate confidence in TAF.

Outlook /Tuesday Night through Friday/ .

Tuesday Night: MVFR/IFR conditions possible. Strong winds with gusts up to 50 kt. SHRA, TSRA likely.

Wednesday: VFR. Breezy. Chance SHRA, slight chance TSRA.

Wednesday Night through Friday: VFR.

MARINE. As of 145 pm .

Have raised Tropical Storm Warnings for all coastal waters, but the primary time period for those conditions will be from mid- day Tuesday through Tuesday night. Prior to then, southwest winds will continue the rest of today and overnight.

Seas building in association with Isaias Tuesday into Wednesday.

Outlook /Tuesday Night through Friday/ .

Tuesday Night: Low risk for gale force winds with gusts up to 45 kt. Rough seas up to 11 ft. Chance of rain showers, slight chance of thunderstorms.

Wednesday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Slight chance of rain showers, isolated thunderstorms.

Wednesday Night: Winds less than 25 kt. Seas up to 5 ft.

Thursday: Winds less than 25 kt. Seas locally approaching 5 ft.

Thursday Night through Friday: Winds less than 25 kt.

BOX WATCHES/WARNINGS/ADVISORIES. CT . Tropical Storm Warning for CTZ002>004. MA . Tropical Storm Warning for MAZ002>024-026. RI . Tropical Storm Warning for RIZ001>008. MARINE . Tropical Storm Warning for ANZ230>237-250-251-254>256.

SYNOPSIS . BL/BW NEAR TERM . Nash SHORT TERM . BL/BW/Nash LONG TERM . BW AVIATION . Nash MARINE . BL/BW/JWD/Nash


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 9 mi34 min 70°F2 ft
44020 - NANTUCKET SOUND 15 mi21 min SW 16 G 19 78°F1014.6 hPa
WAXM3 - Waquoit Bay Reserve, MA 15 mi76 min SSE 2.9 84°F 1015 hPa74°F
CHTM3 18 mi163 min SW 8 G 17 82°F 1015.2 hPa
BZBM3 - 8447930 - Woods Hole, MA 24 mi43 min 80°F 76°F
NTKM3 - 8449130 - Nantucket Island, MA 31 mi43 min 80°F 78°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 35 mi71 min SSW 14 G 16 76°F 2 ft1013.5 hPa (+0.0)66°F
BUZM3 - Buzzards Bay, MA 45 mi61 min SW 16 G 17 1016.7 hPa (+0.5)
FRVM3 - 8447386 - Fall River, MA 46 mi43 min 89°F 80°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi43 min 85°F
FRXM3 47 mi43 min 88°F 66°F
44013 - BOSTON 16 NM East of Boston, MA 48 mi71 min W 12 G 14 78°F 72°F2 ft1011.7 hPa (+0.0)66°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA2 mi65 minSW 18 G 2410.00 miFair and Breezy90°F69°F50%1014.5 hPa
Otis Air National Guard Base, MA13 mi76 minSW 19 G 2610.00 miFair and Breezy88°F64°F46%1015.2 hPa
Chatham, Chatham Municipal Airport, MA16 mi69 minSW 8 G 1810.00 miFair87°F75°F70%1015.8 hPa
Provincetown Municipal Airport, MA21 mi65 minSSW 17 G 2110.00 miFair87°F70°F57%1014 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
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1 day ago4CalmSW9S7S5S6S5S5SW6SW8S5S5S5SW8SW5CalmCalmS45S9S8S11S9S12
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2 days agoN5NW3N6N7N5N3--CalmCalmCalmCalmCalmCalmN4CalmCalmCalmN4N5N7N6N7NE8N6

Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
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Barnstable Harbor
Click for Map
Mon -- 05:14 AM EDT     Moonset
Mon -- 05:37 AM EDT     Sunrise
Mon -- 06:12 AM EDT     -0.41 feet Low Tide
Mon -- 11:59 AM EDT     Full Moon
Mon -- 12:08 PM EDT     9.46 feet High Tide
Mon -- 06:18 PM EDT     0.60 feet Low Tide
Mon -- 07:56 PM EDT     Sunset
Mon -- 08:23 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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10.79.77.95.52.80.6-0.401.53.96.58.69.49.17.96.13.91.80.712.54.87.49.7

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Mon -- 12:31 AM EDT     -4.70 knots Max Ebb
Mon -- 03:49 AM EDT     0.13 knots Slack
Mon -- 05:16 AM EDT     Moonset
Mon -- 05:39 AM EDT     Sunrise
Mon -- 07:08 AM EDT     4.50 knots Max Flood
Mon -- 10:22 AM EDT     -0.22 knots Slack
Mon -- 11:59 AM EDT     Full Moon
Mon -- 01:02 PM EDT     -4.33 knots Max Ebb
Mon -- 04:10 PM EDT     0.02 knots Slack
Mon -- 07:16 PM EDT     4.16 knots Max Flood
Mon -- 07:57 PM EDT     Sunset
Mon -- 08:24 PM EDT     Moonrise
Mon -- 10:20 PM EDT     -0.04 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-4.6-4.6-4.1-2.91.33.44.24.54.33.72-2.6-3.9-4.3-4.1-3.2-1.32.73.84.143.41.9-2.7

Weather Map
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wmap_A
GEOS Local Image of    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 (14,3,4,5)
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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.