Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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482 FZUS51 KBOX 151205 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 704 AM EST Sat Nov 15 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-160100- 704 AM EST Sat Nov 15 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... High pres moves S of the waters today. A warm front will move into the waters tonight followed by a cold front Sun morning. Behind the front, gale force W-NW winds expected to develop Sun into Mon as low pres strengthens in the Maritimes. A weak low pres will move E off the mid Atlc coast Wed as high pres moves from the Gt Lakes into New Eng Wed and Thu. $$ ANZ250-160100- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...W winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 5 seconds and E 1 foot at 9 seconds. .TONIGHT...SW winds 10 to 15 kt, becoming S 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 4 seconds and SE 2 ft at 8 seconds. Rain. Vsby 1 NM or less after midnight. .SUN...W winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Gusts up to 40 kt. Seas 3 to 4 ft, building to 4 to 6 ft in the afternoon. Wave Detail: W 4 ft at 4 seconds and SE 2 ft at 6 seconds, becoming W 5 ft at 5 seconds and SE 1 foot at 7 seconds. .SUN NIGHT...W winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 8 ft. Wave Detail: W 7 ft at 6 seconds and S 1 foot at 7 seconds. .MON AND MON NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 8 ft. Wave Detail: W 7 ft at 6 seconds and SW 1 foot at 11 seconds. .TUE...W winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: W 5 ft at 5 seconds. .TUE NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .WED AND WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-160100- Massachusetts Bay and Ipswich Bay- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...W winds 10 to 15 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds. .TONIGHT...SW winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and NE 1 foot at 5 seconds. Rain. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .SUN...W winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Gusts up to 35 kt. Seas around 3 ft. Wave Detail: W 3 ft at 3 seconds and SE 2 ft at 6 seconds. .SUN NIGHT...W winds 25 to 30 kt. Seas 3 to 4 ft. Wave Detail: W 4 ft at 4 seconds and SW 3 ft at 8 seconds. .MON AND MON NIGHT...W winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: NW 4 ft at 5 seconds and SW 3 ft at 10 seconds. .TUE THROUGH WED NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 5 seconds. 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. $$ ANZ231-160100- Cape Cod Bay- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 10 to 15 kt, becoming W this afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 5 seconds and E 1 foot at 9 seconds. .TONIGHT...SW winds 10 to 15 kt, becoming S 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 2 ft at 3 seconds and N 2 ft at 5 seconds. Rain. Vsby 1 to 3 NM. .SUN...W winds 15 to 20 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: W 4 ft at 5 seconds and SW 3 ft at 8 seconds. .SUN NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 3 to 5 ft. Wave Detail: W 5 ft at 5 seconds and SW 3 ft at 9 seconds. .MON AND MON NIGHT...W winds 25 to 30 kt. Seas 3 to 5 ft. Wave Detail: NW 5 ft at 6 seconds and SW 3 ft at 10 seconds. .TUE AND TUE NIGHT...W winds 15 to 20 kt, diminishing to 10 to 15 kt. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: NW 4 ft at 6 seconds and S 1 foot at 10 seconds. .WED AND WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft, then 1 foot or less. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-160100- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: N 3 ft at 6 seconds and E 1 foot at 9 seconds. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt, becoming S 20 to 25 kt with gusts up to 30 kt after midnight. Seas 2 to 3 ft, building to 4 to 6 ft after midnight. Wave Detail: SW 2 ft at 4 seconds and N 2 ft at 6 seconds, becoming S 5 ft at 6 seconds and N 2 ft at 6 seconds. A chance of rain in the evening, then rain after midnight with vsby 1 NM or less. .SUN...W winds 15 to 20 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt in the afternoon. Seas 5 to 7 ft. S and E of Nantucket, seas 6 to 9 ft, building to 8 to 11 ft in the afternoon. Wave Detail: W 5 ft at 5 seconds and S 4 ft at 8 seconds. .SUN NIGHT...W winds 25 to 30 kt with gusts up to 40 kt. Seas 7 to 10 ft, except 11 to 15 ft S and E of Nantucket. Wave Detail: W 7 ft at 6 seconds and S 4 ft at 10 seconds. A chance of showers after midnight. .MON...W winds 25 to 30 kt with gusts up to 35 kt. Seas 7 to 10 ft. S and E of Nantucket, seas 11 to 15 ft, subsiding to 9 to 13 ft in the afternoon. Wave Detail: W 7 ft at 6 seconds and SW 3 ft at 11 seconds. .MON NIGHT...W winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Seas 6 to 9 ft. Wave Detail: NW 6 ft at 6 seconds and SW 2 ft at 11 seconds. .TUE...W winds 20 to 25 kt. Seas 4 to 6 ft. .TUE NIGHT AND WED...NW winds 15 to 20 kt, diminishing to 5 to 10 kt. Seas 2 to 4 ft. .WED NIGHT...N 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. $$ ANZ255-160100- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 10 to 15 kt, becoming W this afternoon. Seas 2 to 4 ft. Wave Detail: N 3 ft at 6 seconds and E 1 foot at 9 seconds. .TONIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Gusts up to 30 kt. Seas 2 to 4 ft, building to 4 to 6 ft after midnight. Wave Detail: SW 3 ft at 5 seconds and NE 1 foot at 7 seconds, becoming S 6 ft at 7 seconds and NE 1 foot at 8 seconds. Rain. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .SUN...W winds 25 to 35 kt with gusts up to 40 kt. Seas 6 to 9 ft, building to 8 to 11 ft in the afternoon. Wave Detail: SW 9 ft at 8 seconds and NE 1 foot at 7 seconds, becoming SW 11 ft at 9 seconds and NE 1 foot at 7 seconds. A chance of rain in the morning. .SUN NIGHT...W winds 35 to 40 kt with gusts up to 45 kt. Seas 10 to 14 ft. Wave Detail: W 13 ft at 9 seconds and E 1 foot at 14 seconds. A chance of showers after midnight. .MON...W winds 30 to 35 kt, diminishing to 25 to 30 kt in the afternoon. Seas 10 to 14 ft, subsiding to 9 to 12 ft in the afternoon. Wave Detail: W 13 ft at 9 seconds and E 1 foot at 14 seconds, becoming W 11 ft at 9 seconds and E 1 foot at 14 seconds. .MON NIGHT...NW winds 25 to 35 kt. Seas 9 to 12 ft, subsiding to 7 to 10 ft after midnight. Wave Detail: W 10 ft at 9 seconds and E 1 foot at 14 seconds, becoming W 9 ft at 8 seconds and SW 2 ft at 9 seconds. .TUE...W winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. .TUE NIGHT...NW winds 15 to 20 kt. Seas 3 to 5 ft. .WED AND WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-160100- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 10 to 15 kt, becoming W this afternoon. Seas 2 to 3 ft. Wave Detail: N 3 ft at 4 seconds. .TONIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Gusts up to 30 kt. Seas 2 to 4 ft, building to 5 to 7 ft after midnight. Wave Detail: SW 3 ft at 4 seconds and N 1 foot at 3 seconds, becoming S 7 ft at 8 seconds and E 1 foot at 15 seconds. Rain. Vsby 1 to 3 NM. .SUN...W winds 25 to 35 kt with gusts up to 40 kt. Seas 6 to 8 ft, building to 8 to 11 ft in the afternoon. Wave Detail: W 8 ft at 7 seconds and SW 5 ft at 8 seconds, becoming W 9 ft at 7 seconds and SW 7 ft at 9 seconds. .SUN NIGHT...W winds 30 to 40 kt with gusts up to 45 kt. Seas 9 to 13 ft. Wave Detail: W 11 ft at 7 seconds and SW 8 ft at 9 seconds. .MON...W winds 30 to 35 kt, diminishing to 25 to 30 kt in the afternoon. Seas 9 to 12 ft. Wave Detail: W 10 ft at 7 seconds and SW 7 ft at 9 seconds. .MON NIGHT...NW winds 25 to 35 kt. Seas 7 to 10 ft. Wave Detail: NW 9 ft at 7 seconds and SW 5 ft at 9 seconds. .TUE...W winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. .TUE NIGHT AND WED...NW winds 15 to 20 kt, diminishing to 5 to 10 kt. Seas 2 to 4 ft. .WED NIGHT...N 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. $$ ANZ232-160100- Nantucket Sound- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 10 to 15 kt, becoming W this afternoon. Seas around 2 ft. Wave Detail: NW 2 ft at 3 seconds and NE 1 foot at 6 seconds. .TONIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt with gusts up to 30 kt after midnight. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and S 2 ft at 8 seconds. Rain. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .SUN...W winds 20 to 25 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt in the afternoon. Seas 4 to 6 ft. Wave Detail: W 5 ft at 5 seconds and SW 3 ft at 9 seconds. .SUN NIGHT...W winds 30 to 35 kt with gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: W 6 ft at 5 seconds and SW 4 ft at 10 seconds. .MON AND MON NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 ft. Wave Detail: W 6 ft at 5 seconds and SW 3 ft at 10 seconds. .TUE...W winds 20 to 25 kt. Seas 3 to 5 ft. Wave Detail: NW 4 ft at 5 seconds and SW 1 foot at 9 seconds. .TUE NIGHT THROUGH WED NIGHT...N winds 15 to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-160100- Vineyard Sound- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 10 to 15 kt, becoming W this afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 5 seconds. .TONIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Gusts up to 30 kt. Seas 2 to 3 ft, building to 3 to 5 ft after midnight. Wave Detail: SW 2 ft at 4 seconds and NE 1 foot at 6 seconds, becoming S 5 ft at 7 seconds and NE 1 foot at 7 seconds. Rain. Vsby 1 to 3 NM. .SUN...W winds 20 to 25 kt, increasing to 25 to 30 kt in the afternoon. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and E 1 foot at 15 seconds. .SUN NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 ft. Wave Detail: SW 7 ft at 9 seconds and W 4 ft at 6 seconds. .MON...W winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 ft. Wave Detail: SW 6 ft at 9 seconds and W 4 ft at 6 seconds. .MON NIGHT...W winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Seas 4 to 6 ft. Wave Detail: W 5 ft at 8 seconds. .TUE AND TUE NIGHT...W winds 15 to 20 kt, becoming NW 10 to 15 kt. Gusts up to 25 kt. Seas 2 to 4 ft. .WED AND WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft, then 1 foot or less. 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. $$ ANZ234-160100- Buzzards Bay- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 10 to 15 kt, becoming W this afternoon. Seas around 2 ft this morning, then 1 foot or less. Wave Detail: N 1 foot at 4 seconds, becoming W 1 foot at 3 seconds and N 1 foot at 4 seconds. .TONIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt with gusts up to 30 kt after midnight. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and S 2 ft at 8 seconds. Rain. Vsby 1 to 3 NM. .SUN...W winds 20 to 25 kt, increasing to 25 to 30 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and E 1 foot at 6 seconds. .SUN NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 9 seconds and W 5 ft at 6 seconds. .MON AND MON NIGHT...W winds 25 to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 9 seconds and W 4 ft at 6 seconds. .TUE THROUGH WED NIGHT...N winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft at 5 seconds and SW 1 foot at 9 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-160100- Rhode Island Sound- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 10 to 15 kt, becoming W this afternoon. Seas around 2 ft. Wave Detail: N 2 ft at 5 seconds. .TONIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Gusts up to 30 kt. Seas 2 to 3 ft, building to 4 to 6 ft after midnight. Wave Detail: SW 3 ft at 4 seconds and NE 1 foot at 3 seconds, becoming SW 6 ft at 6 seconds and S 4 ft at 9 seconds. Rain. Vsby 1 to 3 NM. .SUN...W winds 20 to 25 kt, increasing to 25 to 30 kt in the afternoon. Gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: SW 7 ft at 7 seconds and E 1 foot at 15 seconds. .SUN NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 6 to 9 ft. Wave Detail: SW 8 ft at 9 seconds and W 6 ft at 6 seconds. .MON AND MON NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 ft. Wave Detail: SW 7 ft at 9 seconds and W 6 ft at 6 seconds. .TUE...W winds 20 to 25 kt. Seas 3 to 5 ft. Wave Detail: W 5 ft at 6 seconds and SW 1 foot at 9 seconds. .TUE NIGHT THROUGH WED NIGHT...N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 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. $$ ANZ237-160100- Block Island Sound- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 5 to 10 kt, becoming W this afternoon. Seas around 2 ft. Wave Detail: N 1 foot at 3 seconds. .TONIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Gusts up to 30 kt. Seas 2 to 3 ft, building to 3 to 5 ft after midnight. Wave Detail: SW 2 ft at 3 seconds, becoming SW 4 ft at 5 seconds and S 3 ft at 8 seconds. Rain. Vsby 1 to 3 NM. .SUN...W winds 20 to 25 kt, increasing to 25 to 30 kt in the afternoon. Seas 5 to 7 ft. Wave Detail: W 5 ft at 5 seconds and S 4 ft at 8 seconds. .SUN NIGHT...W winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 8 ft. Wave Detail: W 6 ft at 6 seconds and S 4 ft at 9 seconds. .MON...W winds 25 to 30 kt with gusts up to 35 kt. Seas 5 to 7 ft. Wave Detail: W 5 ft at 5 seconds and SW 3 ft at 9 seconds. .MON NIGHT...W winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: W 5 ft at 5 seconds and SW 3 ft at 9 seconds. .TUE AND TUE NIGHT...W winds 15 to 20 kt, becoming NW 10 to 15 kt. Gusts up to 25 kt. Seas 2 to 4 ft. .WED AND WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft, then 1 foot or less. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-160100- Boston Harbor- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...W winds around 10 kt. Waves 1 foot or less. .TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Waves around 2 ft. Rain. Vsby 1 to 3 NM. .SUN...W winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Gusts up to 30 kt. Waves around 2 ft. .SUN NIGHT...W winds 20 to 25 kt with gusts up to 30 kt. Waves around 2 ft. .MON AND MON NIGHT...W winds 20 to 25 kt with gusts up to 30 kt. Waves around 2 ft. .TUE THROUGH WED NIGHT...NW winds 15 to 20 kt. Waves 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. $$ ANZ236-160100- Narragansett Bay- 704 AM EST Sat Nov 15 2025 ...GALE WATCH IN EFFECT FROM SUNDAY MORNING THROUGH MONDAY EVENING... .TODAY...NW winds 5 to 10 kt, becoming W this afternoon. Waves 1 foot or less. .TONIGHT...SW winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 25 kt. Waves 2 to 3 ft. Rain. Vsby 1 to 3 NM. .SUN...W winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Gusts up to 35 kt. Waves 2 to 3 ft. .SUN NIGHT...W winds 20 to 25 kt with gusts up to 30 kt. Waves around 3 ft, except 4 to 6 ft at the bay entrance. .MON AND MON NIGHT...W winds 20 to 25 kt with gusts up to 30 kt. Waves 2 to 3 ft. .TUE THROUGH WED NIGHT...N winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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