South Yarmouth, MA Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for South Yarmouth, MA

June 18, 2024 7:35 AM EDT (11:35 UTC) Change Location
Sunrise 5:04 AM   Sunset 8:20 PM
Moonrise 5:15 PM   Moonset 2:21 AM 
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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- 704 Am Edt Tue Jun 18 2024

Today - SW winds around 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave detail: sw 2 ft at 3 seconds and S 1 foot at 6 seconds.

Tonight - SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave detail: S 2 ft at 5 seconds and se 1 foot at 11 seconds.

Wed - SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave detail: sw 2 ft at 3 seconds and S 1 foot at 6 seconds.

Wed night - SW winds around 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave detail: sw 2 ft at 4 seconds and S 1 foot at 9 seconds.

Thu and Thu night - SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave detail: sw 3 ft at 4 seconds and se 1 foot at 9 seconds.

Fri through Sat - SE winds 10 to 15 kt. Seas around 2 ft. Wave detail: sw 2 ft at 4 seconds and ne 1 foot at 3 seconds. A chance of showers.

Sat night - S winds around 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 704 Am Edt Tue Jun 18 2024

Synopsis for massachusetts and rhode island coastal waters - High pres remains anchored over the far eastern outer waters through the rest of the workweek. This will maintain ssw wind gusts 20-25 knots on most waters through the workweek. Dry weather is expected until later Fri.


7 Day Forecast for Marine Location Near South Yarmouth, MA
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Area Discussion for - Boston, MA
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FXUS61 KBOX 181106 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 706 AM EDT Tue Jun 18 2024

SYNOPSIS
Dangerous heat and humidity arrive Tuesday away from the south coast and then peaks in the Wednesday through Friday time frame. Near to record breaking high temperatures are possible.
Heat peaks on Thursday before more seasonable temperatures return for the weekend. Showers and thunderstorms possible each afternoon and evening Friday thru Sunday.

NEAR TERM /UNTIL 6 PM THIS EVENING/

7 AM Update...

Hazy, humid, and hot are the key words for today's forecast with most ASOS locations making a run at 70F at the 7 AM observation.
As mentioned by the previous forecaster, isolated showers are possible this afternoon but will likely be constrained to the high terrain given lack of forcing and rising heights.

345 AM update...

* Dangerous heat and humidity ramps up away from the south coast * Low risk for an isolated t-storm in the interior

Subtropical ridge continues to build across the region today with 500 mb heights rising to 594+ dam. This will be accompanied by a warm sector airmass with lots of sunshine across the area, along with dew pts rising to 65-70 and a anomalous warm airmass, with 925 mb temps of +23C to +25C and +18C at 850 mb. This supports highs of 90-95 across much of northern MA, including the city of Boston and into northern CT and northern RI. These air temps combined with high dew pts will yield heat indices in the mid to upper 90s this afternoon. Hence, day 1 of our expected heat wave this week. Heat advisories remain posted.

Not as hot along the south coast with highs in in the 80s, except mid to upper 70s across the Cape and Islands, with S-SW winds 10-15 mph, gusting up to 20 mph at times, streaming across SSTs only in the 60s. Hence, some relief along the south coast. The east coast of MA may have a brief seabreeze develop from approximately 15z-19z, when winds briefly turn to the SE, but should veer back to the SW after 19z, yielding highs in the upper 80s and lower 90s.

Weak short wave currently across northern NY state is triggering some isolated to scattered showers in that region. Given height rises across SNE today, forcing for ascent will be weak and the atmosphere will likely be capped. Thus, only than an isolated shower/t-storm across western-central MA this afternoon, dry weather prevails elsewhere.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/
345 AM update...

* Not much relief tonight with lows 65-70 * Dangerous heat and humidity continue Wed away from the south coast * Other than a spot shower/T-storm northwest MA, dry weather prevails

Tuesday night...

Mainly clear to partly cloudy conditions along with dry weather prevail beneath building ridge across New England. Lows will be mostly in the mid-upper 60s.

Wednesday...

595 dam ridge remains over SNE, providing mainly dry and hot weather. Airmass warms slightly and combined with mostly sunny conditions, this will support highs in the low to mid 90s from northern portions of CT/RI and into northern MA. These air temps will combine with dew pts of 65-70 to yield heat indices from 95- 100. Some relief south coast and islands, as SSW winds 10-15 mph with gusts up to 20 mph at times, will provide somewhat of refreezing breeze off the cooler ocean with SSTs in the low to mid 60s. As for precip, high amplitude anticyclone over SNE should provide a mid level cap and keep our region mainly dry. Only area for a low risk of an isolated shower/t-storm is across northwest MA

LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/
345 AM update...

* Heat peaks on Thursday with high temperatures in the upper 90s likely for the interior

* Temperatures on Friday remain uncertain with cold front nearby

* Cooler, but still muggy, conditions Saturday and Sunday with chances for afternoon showers and thunderstorms

Very persistent and anomolously strong ridge peaks in intensity on Thursday with 500mb heights making a run at 600mb associated with 850mb temperatures around 20C by afternoon. Given a more NW/W wind component as ridge axis crests, will have some downslope enhancement driving temperatures a few degrees warmer compared to Wednesday. Will note that the overnight guidance trended a bit cooler compared to previous model runs, with highs now projected to remain just below 100F, though still cant rule out a run at the triple digits in the southern CT and Merrimack River Valleys. A Excessive Heat Watch remains in place for Thursday with a determination on an advisory vs warning to be made during later shifts. Shower activity "riding the ridge" looks to remain to our north Thursday afternoon/evening, though it is possible a stray shower develops along the MA/NH border.

Ridge begins to collapse south on Friday as a cold front drops south from NH/ME into our region, increasing shower and t-storm chances during the afternoon. There remains uncertainty in how fast the front will drop south from northern New England, which leads to a wide range in guidance regarding high temps, with an earlier frontal passage yielding cooler daytime highs especially across the eastern half of the CWA For now, elected to follow the NBM for highs on Friday, noting that future updates may need to blend in cooler guidance.

More seasonable airmass remains in place through the weekend though humidity remains high, which will introduce the chance for afternoon and early evening t-storms each day through Sunday. While surface instability wanes with sunset each evening, some storms could continue into the early overnight hours. Cold frontal passage sometime late Sunday-late Monday brings our next chance for more widespread, stratiform precip before another prolonged period of dry conditions.

AVIATION /11Z TUESDAY THROUGH SATURDAY/
Forecast Confidence Levels:

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

12z TAF Update...

High confidence for VFR, SSW winds 10-15 kt, gusts up to 20 kt at times along the south coast and Islands. Low risk for an isolated shower or T-storm this afternoon across western-central MA. Low to moderate risk of brief seabreeze 15z-19z along eastern MA coast, including KBOS, with winds become SE.

Tuesday night...High confidence for VFR, S-SW winds 5-10 kt along with dry weather.

Wednesday...almost a rinse and repeat forecast, VFR, mainly dry weather along with SW winds 10-15 kt with gusts up to 20 kt at times.

KBOS TAF...High confidence in TAF. Only wrinkle is duration of seabreeze today. Winds remain below 10 kt thru the column until about 18z, then increase steadily after 18z. Hence, a southeast seabreeze likely 15z-19z approximately, then shifting back to SSW thereafter.

KBDL TAF...High confidence in TAF.

Outlook /Wednesday Night through Saturday/...

Juneteenth through Wednesday Night: VFR. Breezy.

Thursday through Thursday Night: Breezy. Slight chance SHRA.

Friday through Friday Night: Chance SHRA, isolated TSRA.

Saturday: Slight chance SHRA.

MARINE
Forecaster Confidence Levels:

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

345 AM update...

* Fairly tranquil boating weather

Tuesday...

Clear conditions with increasing southerly winds gusting up to 20 knots at times. Seas 2-4 ft

Tonight and Wed...SSW winds and dry weather.

Outlook /Wednesday Night through Saturday/...

Juneteenth: Winds less than 25 kt.

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

Thursday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers.

Friday through Friday Night: Winds less than 25 kt. Chance of rain showers.

Saturday: Winds less than 25 kt. Slight chance of rain showers.

CLIMATE
All Time June High Temperature Record (Daily)

BOS - 100 F (06/06/1925, 06/26/1952 and 06/30/2021)
BDL - 100 F (06/26/1952, 06/30/1964)
PVD - 98 F (06/25/1943, 06/15/1945 and 06/30/1945)
ORH - 98 F (06/26/1952)

Most recent day of 100 F (or greater)

BOS - 100 F (07/24/2022)
BDL - 100 F (07/21/2019)
PVD - 100 F (07/28/2020)
ORH - 102 F (07/04/1911)*

* For ORH this is the only 100+ degree day in its period of record.

Daily High Temperature Records...

June 18th

BOS - 94 F (1907 and 1929)
BDL - 95 F (1957 and 1994)
PVD - 94 F (1929)
ORH - 93 F (1907 and 1929)

June 19th

BOS - 96 F (1923)
BDL - 95 F (1995)
PVD - 94 F (1923)
ORH - 93 F (1923)

June 20th

BOS - 98 F (1953)
BDL - 97 F (2012)
PVD - 95 F (1941)
ORH - 93 F (1953)

June 21st

BOS - 96 F (2012)
BDL - 96 F (1953 and 2012)
PVD - 96 F (1941)
ORH - 91 F (Multi-Years)

Daily Warmest Low Temperatures Records...

June 18th

BOS - 72 F (1929)
BDL - 70 F (1905)
PVD - 72 F (1929)
ORH - 69 F (1905 and 1994)

June 19th

BOS - 73 F (1995)
BDL - 72 F (1929)
PVD - 70 F (1995)
ORH - 72 F (1929)

June 20th

BOS - 78 F (1931)
BDL - 74 F (1931)
PVD - 74 F (1931)
ORH - 72 F (1931)

June 21st

BOS - 80 F (2012)
BDL - 73 F (1923 and 2012)
PVD - 75 F (2012)
ORH - 74 F (1923 and 2012)

BOX WATCHES/WARNINGS/ADVISORIES
CT...Air Quality Alert from 11 AM this morning to 11 PM EDT this evening for CTZ002.
Heat Advisory from noon today to 7 PM EDT this evening for CTZ002-003.
Excessive Heat Watch from Wednesday afternoon through Friday evening for CTZ002-003.
Heat Advisory from noon today to 7 PM EDT Friday for CTZ004.
MA...Air Quality Alert from 11 AM this morning to 11 PM EDT this evening for MAZ005>007-010>012.
Heat Advisory from noon today to 7 PM EDT this evening for MAZ003-005-006-010-011-013-014.
Excessive Heat Watch from Wednesday afternoon through Friday evening for MAZ003-005-006-010-011-013-014.
Heat Advisory from noon today to 7 PM EDT Friday for MAZ002- 004-007>009-012-015-016-026.
Heat Advisory from noon Wednesday to 7 PM EDT Friday for MAZ017>019.
RI...Heat Advisory from noon today to 7 PM EDT Friday for RIZ001.
Heat Advisory from noon Wednesday to 7 PM EDT Friday for RIZ002>005.
MARINE...None.




Weather Reporting Stations
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Stations Dist Age Wind AirWater WavesinHgDewPt
44020 - NANTUCKET SOUND 11 mi35 minSW 14G16 68°F 68°F30.2366°F
CHTM3 14 mi47 min 86°F 30.23
44090 15 mi65 min 63°F2 ft
NTKM3 - 8449130 - Nantucket Island, MA 25 mi47 minSW 8G12 66°F 69°F30.25
BZBM3 - 8447930 - Woods Hole, MA 26 mi47 min 67°F 67°F30.24
NBGM3 37 mi47 minWSW 7G9.9 70°F 30.24
44018 - SE Cape Cod 30NM East of Nantucket, MA 39 mi55 min 62°F2 ft
44085 47 mi65 min 67°F 64°F3 ft
BUZM3 - Buzzards Bay, MA 47 mi35 minSW 18G19 66°F 30.25


Wind History for Nantucket Island, MA
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Airport Reports
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Link to 1 hour of 5 minute data for KHYA
   
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Wind History graph: HYA
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Tide / Current for South Yarmouth, Bass River, Nantucket Sound, Massachusetts
   
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South Yarmouth
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Tue -- 02:21 AM EDT     Moonset
Tue -- 04:55 AM EDT     0.31 feet Low Tide
Tue -- 05:06 AM EDT     Sunrise
Tue -- 11:09 AM EDT     2.50 feet High Tide
Tue -- 05:02 PM EDT     0.46 feet Low Tide
Tue -- 05:15 PM EDT     Moonrise
Tue -- 08:18 PM EDT     Sunset
Tue -- 11:19 PM EDT     2.90 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

South Yarmouth, Bass River, Nantucket Sound, Massachusetts, Tide feet
12
am
2.5
1
am
2.1
2
am
1.5
3
am
0.9
4
am
0.5
5
am
0.3
6
am
0.5
7
am
0.8
8
am
1.3
9
am
1.8
10
am
2.3
11
am
2.5
12
pm
2.4
1
pm
2.1
2
pm
1.6
3
pm
1.1
4
pm
0.7
5
pm
0.5
6
pm
0.6
7
pm
1
8
pm
1.5
9
pm
2.1
10
pm
2.6
11
pm
2.9


Tide / Current for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
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Tue -- 01:04 AM EDT     0.00 knots Slack
Tue -- 02:20 AM EDT     Moonset
Tue -- 04:38 AM EDT     1.81 knots Max Flood
Tue -- 05:05 AM EDT     Sunrise
Tue -- 07:41 AM EDT     -0.00 knots Slack
Tue -- 10:22 AM EDT     -1.40 knots Max Ebb
Tue -- 01:24 PM EDT     0.00 knots Slack
Tue -- 04:53 PM EDT     1.70 knots Max Flood
Tue -- 05:13 PM EDT     Moonrise
Tue -- 07:52 PM EDT     -0.00 knots Slack
Tue -- 08:16 PM EDT     Sunset
Tue -- 10:39 PM EDT     -1.58 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

Pollock Rip Channel, Massachusetts Current, knots
12
am
-0.8
1
am
-0.1
2
am
0.8
3
am
1.4
4
am
1.7
5
am
1.8
6
am
1.4
7
am
0.7
8
am
-0.3
9
am
-1
10
am
-1.4
11
am
-1.3
12
pm
-1
1
pm
-0.3
2
pm
0.5
3
pm
1.2
4
pm
1.6
5
pm
1.7
6
pm
1.5
7
pm
0.8
8
pm
-0.1
9
pm
-1
10
pm
-1.5
11
pm
-1.6


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Boston, MA,




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