


Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
Versions:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
496 FZUS51 KBOX 032007 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 407 PM EDT Thu Jul 3 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-040900- 407 PM EDT Thu Jul 3 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... Weak cold front moves though tonight. High presbuilds over the region Fri and Sat, then settles south of the region Sun into next week. $$ ANZ250-040900- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 407 PM EDT Thu Jul 3 2025 .TONIGHT...W winds around 10 kt. Seas 2 to 3 ft. Wave Detail: W 2 ft at 3 seconds and SE 2 ft at 7 seconds. A chance of showers and tstms this evening. Some tstms may produce damaging winds, small hail, frequent lightning, and heavy rainfall this evening. .FRI...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NW 2 ft at 3 seconds and SE 2 ft at 7 seconds. .FRI NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 8 seconds and NW 1 foot at 3 seconds. .SAT...W winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds and NW 1 foot at 3 seconds. .SAT NIGHT AND SUN...S winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 4 seconds and NW 1 foot at 3 seconds. .SUN NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 8 seconds. .MON AND MON NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .TUE AND TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-040900- Massachusetts Bay and Ipswich Bay- 407 PM EDT Thu Jul 3 2025 .TONIGHT...W winds around 10 kt. Seas around 2 ft. Wave Detail: SW 1 foot at 3 seconds and E 1 foot at 8 seconds. A chance of showers and tstms this evening. Some tstms may produce damaging winds, small hail, frequent lightning, and heavy rainfall this evening. .FRI...NW winds around 10 kt. Seas around 2 ft. Wave Detail: NW 1 foot at 3 seconds and S 1 foot at 5 seconds. .FRI NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW 1 foot at 3 seconds and S 1 foot at 4 seconds. .SAT...W winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 6 seconds and NW 1 foot at 3 seconds. .SAT NIGHT THROUGH SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and NW 1 foot at 3 seconds. .MON...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 E 1 foot at 8 seconds. .MON NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .TUE AND TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming W. Seas around 2 ft. A chance of showers and tstms. Vsby 1 to 3 NM. 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. $$ ANZ231-040900- Cape Cod Bay- 407 PM EDT Thu Jul 3 2025 .TONIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and W 1 foot at 2 seconds. A chance of showers and tstms this evening. Some tstms may produce damaging winds, small hail, frequent lightning, and heavy rainfall this evening. .FRI...NW winds around 10 kt, becoming NE in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at 3 seconds. .FRI NIGHT...S winds 5 to 10 kt, becoming NW after midnight. Seas 1 foot or less. Wave Detail: NW 1 foot at 3 seconds and SE 1 foot at 5 seconds. .SAT...W winds around 5 kt, becoming S in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: NW 1 foot at 3 seconds and E 1 foot at 7 seconds. .SAT NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 1 foot at 3 seconds and NW 1 foot at 3 seconds. .SUN AND SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 8 seconds. .MON AND MON NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .TUE AND TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-040900- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 407 PM EDT Thu Jul 3 2025 .TONIGHT...W winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 8 seconds and W 1 foot at 3 seconds. Areas of fog. A slight chance of showers and tstms this evening. Some tstms may produce damaging winds, small hail, frequent lightning, and heavy rainfall this evening. Vsby 1 NM or less. .FRI...NW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 8 seconds and NW 1 foot at 3 seconds. .FRI NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: S 2 ft at 8 seconds and SE 2 ft at 8 seconds. .SAT...W winds 5 to 10 kt, becoming SW in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and SE 2 ft at 8 seconds. .SAT NIGHT THROUGH SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 5 seconds and NW 1 foot at 4 seconds. .MON AND MON NIGHT...SW winds around 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 8 seconds. .TUE AND TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. 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. $$ ANZ255-040900- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 407 PM EDT Thu Jul 3 2025 .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds and W 1 foot at 3 seconds. Areas of fog. A slight chance of showers and tstms this evening. Some tstms may be severe with damaging winds, small hail, frequent lightning, and heavy rainfall. Vsby 1 NM or less. .FRI...W winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds and SE 2 ft at 8 seconds. .FRI NIGHT...W winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and W 1 foot at 3 seconds. .SAT...NW winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at 3 seconds. .SAT NIGHT THROUGH SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 4 seconds and SE 1 foot at 8 seconds. .MON AND MON NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 8 seconds. .TUE AND TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas 3 to 4 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-040900- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 407 PM EDT Thu Jul 3 2025 .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds and W 1 foot at 3 seconds. Areas of fog this evening. A slight chance of showers with isolated tstms this evening. Some tstms may be severe with damaging winds, small hail, frequent lightning, and heavy rainfall. Vsby 1 to 3 NM this evening. .FRI...NW winds around 10 kt, becoming W in the afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at 8 seconds and NW 1 foot at 3 seconds. .FRI NIGHT...W winds 10 to 15 kt, becoming N 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and W 1 foot at 3 seconds. .SAT...NW winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at 2 seconds. .SAT NIGHT THROUGH SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 8 seconds. .MON...SW winds around 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 8 seconds. .MON NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. A chance of showers. .TUE AND TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. A chance of showers. 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. $$ ANZ232-040900- Nantucket Sound- 407 PM EDT Thu Jul 3 2025 .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: W 2 ft at 3 seconds and S 2 ft at 7 seconds. Areas of fog this evening. A chance of showers with a slight chance of tstms this evening. Some tstms may be severe with damaging winds, small hail, frequent lightning, and heavy rainfall. Vsby 1 to 3 NM this evening. .FRI...NW winds 10 to 15 kt, becoming SW in the afternoon. Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and S 1 foot at 7 seconds. .FRI NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and S 1 foot at 7 seconds. .SAT...W winds around 5 kt, becoming SW in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at 2 seconds. .SAT NIGHT THROUGH SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. .MON AND MON NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. .TUE AND TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-040900- Vineyard Sound- 407 PM EDT Thu Jul 3 2025 .TONIGHT...W winds 10 to 15 kt. Gusts up to 20 kt this evening. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 6 seconds and W 1 foot at 3 seconds. A chance of showers with isolated tstms this evening. Some tstms may produce damaging winds, small hail, frequent lightning, and heavy rainfall this evening. .FRI...NW winds around 10 kt, becoming SW in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 7 seconds and NW 1 foot at 3 seconds. .FRI NIGHT...W winds 5 to 10 kt, becoming N after midnight. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and W 1 foot at 3 seconds. .SAT...NW winds around 5 kt, becoming SW in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at 3 seconds. .SAT NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. .SUN AND SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. .MON AND MON NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. .TUE AND TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. 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. $$ ANZ234-040900- Buzzards Bay- 407 PM EDT Thu Jul 3 2025 ...SEVERE THUNDERSTORM WATCH 484 IN EFFECT UNTIL 10 PM EDT THIS EVENING... .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. A chance of showers with isolated tstms this evening. Some tstms may produce damaging winds, small hail, frequent lightning, and heavy rainfall this evening. .FRI...NW winds around 10 kt, becoming SW in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 7 seconds and NW 1 foot at 3 seconds. .FRI NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 6 seconds and W 1 foot at 3 seconds. .SAT...W winds around 5 kt, becoming SW 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 6 seconds and NW 1 foot at 3 seconds. .SAT NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. .SUN AND SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. .MON AND MON NIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt. Gusts up to 25 kt. Seas 2 to 4 ft. .TUE AND TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-040900- Rhode Island Sound- 407 PM EDT Thu Jul 3 2025 ...SEVERE THUNDERSTORM WATCH 484 IN EFFECT UNTIL 10 PM EDT THIS EVENING... .TONIGHT...W winds 10 to 15 kt. Gusts up to 20 kt this evening. Seas 2 to 4 ft. Wave Detail: S 4 ft at 8 seconds and W 1 foot at 3 seconds. A slight chance of showers with isolated tstms this evening. Some tstms may produce damaging winds, small hail, frequent lightning, and heavy rainfall this evening. .FRI...NW winds around 10 kt, becoming SW in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and NW 1 foot at 3 seconds. .FRI NIGHT...W winds around 10 kt, becoming N after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and W 1 foot at 3 seconds. .SAT...NW winds around 5 kt, becoming SW in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at 3 seconds. .SAT NIGHT THROUGH SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 4 seconds and SE 1 foot at 8 seconds. .MON...SW winds around 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 8 seconds. .MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. .TUE AND TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. 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. $$ ANZ237-040900- Block Island Sound- 407 PM EDT Thu Jul 3 2025 ...SEVERE THUNDERSTORM WATCH 484 IN EFFECT UNTIL 10 PM EDT THIS EVENING... .TONIGHT...W winds 10 to 15 kt, becoming NW 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and W 1 foot at 3 seconds. A chance of showers with isolated tstms this evening. Some tstms may produce damaging winds, small hail, frequent lightning, and heavy rainfall this evening. .FRI...NW winds around 10 kt, becoming SW in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and W 1 foot at 3 seconds. .FRI NIGHT...W winds 5 to 10 kt, becoming N after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and W 1 foot at 3 seconds. .SAT...NW winds around 5 kt, becoming SW in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at 2 seconds. .SAT NIGHT THROUGH SUN NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. .MON...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 8 seconds. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-040900- Boston Harbor- 407 PM EDT Thu Jul 3 2025 ...SEVERE THUNDERSTORM WATCH 484 IN EFFECT UNTIL 10 PM EDT THIS EVENING... .TONIGHT...W winds around 10 kt. Waves around 2 ft this evening, then 1 foot or less. A chance of showers and tstms this evening. Some tstms may be severe with damaging winds, small hail, frequent lightning, and heavy rainfall. .FRI...NW winds around 10 kt. Waves around 2 ft. .FRI NIGHT...NW winds 5 to 10 kt. Waves around 2 ft in the evening, then 1 foot or less. .SAT...W winds around 5 kt, becoming S in the afternoon. Waves 1 foot or less, then around 2 ft in the afternoon. .SAT NIGHT THROUGH SUN NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves around 2 ft. .MON...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. A chance of showers. .TUE AND TUE NIGHT...SW winds around 10 kt, becoming W. Waves around 2 ft, then 1 foot or less. A chance of showers and tstms. Winds and waves 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. $$ ANZ236-040900- Narragansett Bay- 407 PM EDT Thu Jul 3 2025 ...SEVERE THUNDERSTORM WATCH 484 IN EFFECT UNTIL 10 PM EDT THIS EVENING... .TONIGHT...W winds 5 to 10 kt. Waves around 2 ft. A slight chance of showers with isolated tstms this evening. Some tstms may be severe with damaging winds, small hail, frequent lightning, and heavy rainfall. .FRI...W winds 5 to 10 kt. Waves around 2 ft. .FRI NIGHT...NW winds 5 to 10 kt. Waves around 2 ft. .SAT...NW winds around 5 kt, becoming SW 10 to 15 kt in the afternoon. Waves around 2 ft. .SAT NIGHT THROUGH SUN NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. .MON...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers. .TUE AND TUE NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt. Waves around 2 ft. A chance of showers and tstms. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ For the latest updates...please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/NWSBoston You can follow us on Twitter at @NWSBoston