Wednesday, July15, 2020
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Marine Weather and Tides
West Yarmouth, 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 5:18AMSunset 8:15PM Wednesday July 15, 2020 4:34 AM EDT (08:34 UTC) Moonrise 1:23AMMoonset 3:38PM Illumination 25% Phase: Waning Crescent; Moon at 25 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- 416 Am Edt Wed Jul 15 2020
Today..N winds 10 to 15 kt with gusts up to 20 kt. Seas around 3 ft.
Tonight..NE winds 10 to 15 kt. Seas 2 to 3 ft.
Thu..NE winds 10 to 15 kt, becoming E 5 to 10 kt in the afternoon. Seas around 2 ft.
Thu night..SE winds 5 to 10 kt. Seas around 2 ft.
Fri..S winds 5 to 10 kt. Seas around 2 ft.
Fri night..SW winds 5 to 10 kt. Seas around 2 ft. A chance of showers and tstms.
Sat..SW winds 5 to 10 kt. Seas around 2 ft.
Sat night..SW winds around 10 kt. Seas around 2 ft.
Sun..SW winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas around 2 ft.
Sun night..SW winds 10 to 15 kt. Seas around 2 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 416 Am Edt Wed Jul 15 2020
Synopsis for massachusetts and rhode island coastal waters.. High pressure nudging into the region from maine for Wednesday. The high will slide east of the waters on Thursday. A warm front approaches on Friday and moves through. Drier weather through the weekend, but will see a cold front move in early next week. 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 Yarmouth, MA
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location: 41.6, -70.27     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 150754 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 354 AM EDT Wed Jul 15 2020

SYNOPSIS.

Dry, cool, comfortable and cloudy due to onshore flow despite the high pressure building in today. The cooler and dry weather continues on Thursday. A warm front will bring a few showers and thunderstorms Friday, then hot and humid weather returns this weekend into early next week. A slow approaching cold front may trigger more showers and storms early next week.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

* Cooler, cloudy and generally dry weather across southern New England today. Isolated showers possible due to upslope across the eastern slopes of the Berkshires.

Synoptically southern New England between a trough offshore and a ridge axis over the central/eastern Great Lakes. The trough will lift offshore and the ridge will build into the eastern Great Lakes. This will keep southern England cloudy and cool due to onshore flow despite a surface high building in. May have some isolated showers across the eastern slopes of the Berkshires due to upslope and heating.

Leaned toward the GFS and high resolution guidance versus the ECWMF/GEM. This keeps the 925 hPa winds in more of an onshore component and advects the cooler air in. As a result should see more cloud cover especially during the first half of the day. There is a possibility that the July sunshine is able to work away at these clouds and break the sun out during the afternoon as indicated by high res guidance. Am skeptical given winds will still be onshore, but drier air is advecting in. Should see dew points falling into the upper 50s by late afternoon across eastern MA and RI.

Temperatures will be much cooler in comparison to the past couple of days with highs topping out in the 70s across the majority of southern New England. Still could see some low 80 degree readings across the CT River Valley.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/.

Highlights

* Isolated showers still possible across the eastern slopes of the Berkshires tonight. Rest of southern New England dry, cool and quiet.

* Dry and quiet weather persists on Thursday across southern New England.

Ridge axis builds into New England tonight. The ridge axis will build east of New England into the Gulf of Maine on Thursday. The surface high will nudge into southern New England tonight from northern Maine. The surface high will move into the Gulf of Maine on Thursday.

The position of the surface high will keep flow onshore tonight. This will continue advecting cool air into the region. This flow in combination with the low level moisture in place and upslope may bring isolated showers to the eastern slopes of the Berkshires. The rest of the region will remain dry with some cloud cover. Will be comfortable with dew points falling into the mid to upper 50s. Low temperatures will generally be in the low 60s.

As the surface high moves into the Gulf of Maine expect low level winds to shift from the east to the southeast on Thursday. Still expecting some cloudiness to the region, but not as much as today. This will result in similar, but slightly warmer temperatures across southern New England. Highs generally in the 70s across the region. Still could see some low 80 degree readings across the CT River Valley.

LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/.

Highlights .

* Chance of showers/t-storms Friday * Hot and humid this weekend into early next week * Increasing risk of showers/t-storms Mon/Tue

Thursday night into Friday night .

Northern stream shortwave tracking east from upper Lakes region will pass north of New Eng during Fri. Warm front approaches from the west with increasing moisture leading to chance of showers/t-storms during Fri. Surface based instability axis will remain to the west Fri but enough elevated instability to support a few t-storms. Focus for scattered showers/t-storms may shift to the south coast Fri night along a weak boundary. Main risk with any convection will be locally heavy rainfall as PWATs increase to 1.75-2 inches. Increasing humidity Fri as dewpoints rise into mid/upper 60s.

Saturday through Tuesday .

SNE will be on the northern periphery of the central/southern CONUS subtropical ridge this weekend which will mean a return to heat and humidity. Heat advisories may be needed for parts of SNE by Sun as high temps in the low/mid 90s combine with dewpoints 70+. Convection not expected this weekend as a cap will be in place.

Next northern stream shortwave from the upper Lakes expected to flatten the ridge across New Eng early next week. Increasing risk of showers/t-storms as a pre-frontal trough moves through Mon ahead of a cold front which approaches Tue. Heat and oppressive humidity likely continues Mon with heat advisory potential. Dewpoints may peak Mon in low/mid 70s. Some cooling possible by Tue.

AVIATION /07Z WEDNESDAY THROUGH SUNDAY/.

Forecaster Confidence Levels .

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

Thru 12Z . High confidence

MVFR to localized IFR conditions expected with onshore flow and stratus moving in. Upper low remains nearby and still could bring brief showers across eastern and northern MA. Best shot of the IFR ceilings are at ORH and ACK. Winds N to NE around 5 kt or less. Only exception is at HYA and ACK where speeds around 10 kts are possible.

Wednesday . Moderate confidence

Gradual improvement from MVFR/IFR to VFR. Do have some uncertainty on the timing and if eastern locations will improve to VFR given that flow will still be onshore. In addition, may have some isolated shower activity across the eastern slopes of the Berkshires due to orographic lifting. Not confident enough in the coverage at this point in time to include in BAF or BDL TAF. Winds shifting to the E with speeds around 5 to 10 kts.

Wednesday Night . High confidence

VFR across the majority of southern New England. Could see MVFR ceilings across the eastern slopes of the Berkshires. Winds generally less than 5 kts out of the E or SE.

Thursday . High confidence

VFR at all locations except for the higher elevations where E to SE winds will bring MVFR ceilings.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF.

Outlook /Thursday Night through Sunday/ .

Thursday Night: VFR. Breezy. Slight chance SHRA.

Friday: Mainly VFR, with local MVFR possible. Breezy. Chance SHRA, chance TSRA.

Friday Night: Mainly VFR, with local MVFR possible. Slight chance SHRA, slight chance TSRA.

Saturday through Sunday: VFR.

MARINE.

Small Craft Advisories expanded to include Mass and Ipswich Bay due to seas building to 5 ft. Small Craft Advisories continue across the eastern outer waters with seas of 5 to 6 ft. Could have a few gusts around 25 kts early this morning, but gusts will quickly diminish below 25kt as the close low moves further offshore. Did extend the Small Craft Advisory time into this evening as seas take a bit longer to subside.

Dry weather expected today into Thursday.

Outlook /Thursday Night through Sunday/ .

Thursday Night: Winds less than 25 kt.

Friday: Winds less than 25 kt. Chance of thunderstorms, slight chance of rain showers.

Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers, chance of thunderstorms.

Saturday through Sunday: Winds less than 25 kt.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Small Craft Advisory until 6 PM EDT this evening for ANZ250- 254.

SYNOPSIS . KJC/BL NEAR TERM . BL SHORT TERM . BL LONG TERM . KJC AVIATION . KJC/BL MARINE . KJC/BL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 7 mi35 min N 16 G 18 1018 hPa (+0.7)
WAXM3 - Waquoit Bay Reserve, MA 14 mi110 min WNW 1 64°F 1018 hPa63°F
44090 17 mi38 min 67°F2 ft
CHTM3 18 mi143 min 1017.7 hPa
BZBM3 - 8447930 - Woods Hole, MA 22 mi65 min 73°F
NTKM3 - 8449130 - Nantucket Island, MA 24 mi65 min 75°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 42 mi45 min NNE 18 G 21 62°F 6 ft1018.9 hPa (+0.8)57°F
BUZM3 - Buzzards Bay, MA 43 mi35 min N 11 G 12 1020 hPa (+0.4)
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 48 mi125 min 1019.2 hPa
FRVM3 - 8447386 - Fall River, MA 48 mi65 min 75°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, MA6 mi39 minN 9 G 1910.00 miMostly Cloudy68°F61°F78%1018.3 hPa
Otis Air National Guard Base, MA14 mi39 minN 510.00 miOvercast64°F62°F94%1019.3 hPa
Chatham, Chatham Municipal Airport, MA16 mi43 minVar 510.00 miMostly Cloudy64°F59°F84%1018.8 hPa
Marthas Vineyard Airport, MA23 mi42 minN 910.00 miOvercast65°F62°F90%1018.6 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
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1 day agoSW7SW5SW7SW8SW6SW5S6S6SW9S9S8SW11
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Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts
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Hyannis Port
Click for Map
Wed -- 01:22 AM EDT     Moonrise
Wed -- 02:07 AM EDT     0.42 feet Low Tide
Wed -- 05:20 AM EDT     Sunrise
Wed -- 08:54 AM EDT     2.69 feet High Tide
Wed -- 02:20 PM EDT     0.46 feet Low Tide
Wed -- 03:37 PM EDT     Moonset
Wed -- 08:13 PM EDT     Sunset
Wed -- 09:12 PM EDT     3.01 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.30.70.40.60.91.31.72.22.62.72.521.40.80.50.60.91.41.82.32.832.92.5

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Wed -- 01:21 AM EDT     Moonrise
Wed -- 03:10 AM EDT     1.74 knots Max Flood
Wed -- 05:19 AM EDT     Sunrise
Wed -- 06:12 AM EDT     -0.00 knots Slack
Wed -- 08:51 AM EDT     -1.38 knots Max Ebb
Wed -- 11:55 AM EDT     0.00 knots Slack
Wed -- 03:29 PM EDT     1.70 knots Max Flood
Wed -- 03:36 PM EDT     Moonset
Wed -- 06:29 PM EDT     -0.00 knots Slack
Wed -- 08:12 PM EDT     Sunset
Wed -- 09:16 PM EDT     -1.54 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.31.11.51.71.61.10.2-0.7-1.2-1.4-1.2-0.70.10.81.41.71.71.30.5-0.5-1.2-1.5-1.5-1.1

Weather Map
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wmap_A
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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Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (4,6,7,8)
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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 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.