Marine Weather and Tide Forecast for Chelsea, MA
April 22, 2025 1:54 AM EDT (05:54 UTC) Change Location
 | Sunrise 5:49 AM Sunset 7:35 PM Moonrise 3:19 AM Moonset 1:23 PM |
ANZ230 Boston Harbor- 104 Am Edt Tue Apr 22 2025
Rest of tonight - S winds 10 to 15 kt. Waves around 2 ft. Showers.
Tue - SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves around 2 ft. Patchy fog in the morning. A chance of showers in the morning with vsby 1 nm or less.
Tue night - W winds 10 to 15 kt. Gusts up to 20 kt after midnight. Waves around 2 ft.
Wed - W winds 5 to 10 kt. Waves 1 foot or less.
Wed night - N winds 5 to 10 kt. Waves 1 foot or less.
Thu and Thu night - SW winds 5 to 10 kt. Waves 1 foot or less.
Fri - S winds 5 to 10 kt. Waves around 2 ft.
Fri night - S winds 10 to 15 kt. Waves around 2 ft. A chance of showers.
Sat and Sat night - S winds 10 to 15 kt, becoming n. Gusts up to 20 kt. Waves around 2 ft. Showers.
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.
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 104 Am Edt Tue Apr 22 2025
Synopsis for massachusetts and rhode island coastal waters - Warm front moves through tonight into Tue. Cold front moves through Tue night with another high pres arriving for Wed. High pres maintains control through Thu. Periodic chances for rainfall Fri through next weekend.
7 Day Forecast for Marine Location Near Chelsea, MA
NEW! Add second zone forecast
| Charles River Dam Click for Map Mon -- 02:48 AM EDT Moonrise Mon -- 05:53 AM EDT Sunrise Mon -- 05:54 AM EDT 9.21 feet High Tide Mon -- 12:09 PM EDT Moonset Mon -- 12:23 PM EDT 1.14 feet Low Tide Mon -- 06:42 PM EDT 8.28 feet High Tide Mon -- 07:33 PM EDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |
Charles River Dam, Charles River, Massachusetts, Tide feet
| 12 am |
| 2.2 |
| 1 am |
| 3.1 |
| 2 am |
| 4.7 |
| 3 am |
| 6.3 |
| 4 am |
| 7.7 |
| 5 am |
| 8.8 |
| 6 am |
| 9.2 |
| 7 am |
| 8.6 |
| 8 am |
| 7.2 |
| 9 am |
| 5.5 |
| 10 am |
| 3.7 |
| 11 am |
| 2.2 |
| 12 pm |
| 1.2 |
| 1 pm |
| 1.4 |
| 2 pm |
| 2.5 |
| 3 pm |
| 4 |
| 4 pm |
| 5.5 |
| 5 pm |
| 7 |
| 6 pm |
| 8 |
| 7 pm |
| 8.2 |
| 8 pm |
| 7.5 |
| 9 pm |
| 6.2 |
| 10 pm |
| 4.7 |
| 11 pm |
| 3.3 |
| Boston Harbor Click for Map Mon -- 01:56 AM EDT 1.04 knots Max Flood Mon -- 02:48 AM EDT Moonrise Mon -- 05:27 AM EDT -0.00 knots Slack Mon -- 05:53 AM EDT Sunrise Mon -- 08:45 AM EDT -0.97 knots Max Ebb Mon -- 12:08 PM EDT Moonset Mon -- 12:26 PM EDT 0.00 knots Slack Mon -- 02:32 PM EDT 1.02 knots Max Flood Mon -- 06:07 PM EDT -0.00 knots Slack Mon -- 07:32 PM EDT Sunset Mon -- 09:23 PM EDT -0.85 knots Max Ebb Tide / Current data from XTide NOT FOR NAVIGATION |
Boston Harbor, Massachusetts Current, knots
| 12 am |
| 0.1 |
| 1 am |
| 0.8 |
| 2 am |
| 1 |
| 3 am |
| 0.9 |
| 4 am |
| 0.7 |
| 5 am |
| 0.3 |
| 6 am |
| -0.3 |
| 7 am |
| -0.7 |
| 8 am |
| -0.9 |
| 9 am |
| -1 |
| 10 am |
| -0.9 |
| 11 am |
| -0.8 |
| 12 pm |
| -0.3 |
| 1 pm |
| 0.4 |
| 2 pm |
| 1 |
| 3 pm |
| 1 |
| 4 pm |
| 0.9 |
| 5 pm |
| 0.6 |
| 6 pm |
| 0.1 |
| 7 pm |
| -0.4 |
| 8 pm |
| -0.7 |
| 9 pm |
| -0.8 |
| 10 pm |
| -0.8 |
| 11 pm |
| -0.8 |
FXUS61 KBOX 220511 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 111 AM EDT Tue Apr 22 2025
SYNOPSIS
A warm front will spread increased cloudiness into Southern New England through tonight, with passing showers around and after midnight. Rain showers then taper off early on Tuesday with decreasing cloudiness in most areas toward mild temperatures in the 60s to low 70s, but cloud cover may linger into the afternoon for the southern coast with cooler temperatures. Mild and dry weather for the rest of the workweek, before our weather pattern turns more unsettled again around the weekend.
NEAR TERM /UNTIL 6 AM THIS MORNING/
Key Messages:
* Turning overcast tonight, with periods of rain showers around and after midnight.
* Rain showers taper off overnight in western New England, but may linger into the pre-dawn hours in eastern New England.
* Lows mid 40s to around 50.
Details:
Although we started the day with full sunshine with coastal seabreezes, we're starting to see increased cloud cover in most areas west of I-495 in MA. This is associated with increased moisture from a warm front which trails from northern VT through western RI; warm sector regime currently confined to much of the eastern Gt Lakes, central/southern NY and western MA/CT precedes a cold front now working its way through the Ohio Valley.
Cloud cover will only continue to gradually increase through tonight and overnight, although many areas to remain dry thru midnight. Rain showers then move into western New England around midnight, then slowly progressing eastward into eastern MA and RI toward the pre- dawn hours. Precipitable water values increase to around 1.2" with the increased SW flow aloft; wouldn't rule out some very brief downpours in a few showers but they're expected to pass through with little overall fanfare. Through early Tuesday morning we should see areal-average rain amts of up to a quarter-inch. Rain showers should be coming to an end west of Worcester close to daybreak while continuing into eastern MA, RI and the Cape and Islands. With the warm advection (925 mb temps warm to around +12C) and increased cloud cover, sided low temps toward milder side of guidance into the mid to upper 40s.
SHORT TERM /6 AM THIS MORNING THROUGH 6 PM WEDNESDAY/
Key Messages:
* Overcast to start Tue; improvement away from the coastlines by mid morning, but it may take until the afternoon before peeks of sun break out for the South Coast, Cape and Islands. Temps range from mid 60s to low 70s away from the southern coast, but only in the 50s to low 60s south coast, Cape/Islands.
* Dry cold frontal passage Tue night, with modest NW breezes.
Seasonable lows in the mid 40s.
Tuesday and Tuesday Night:
Rain showers from the overnight will be progressing off to the east and offshore thru the early to mid morning hours. So while we start off the day with overcast conditions, expect decreasing cloud cover and warming temperatures away from the coasts into the 60s to low 70s. Forecast challenge for Tuesday resides along the south coast, Cape and Islands; very limited mixing is progged given the cooler marine boundary layer with moisture trapped beneath the warm airmass aloft. This is visualized in forecast soundings at New Bedford, Westerly, Falmouth/Hyannis and Nantucket. It could be quite a while, potentially into the afternoon, before low clouds begin to erode given those profiles. and that would cut into how warm temperatures may get for the southern coast, with cooler SWly onshore flow for these locations as well. Thus opted for highs only in the 50s, perhaps near 60. If cloud cover does scatter out earlier, then temps would be too cool and could reach up into low to mid 60s.
We then get a dry cold frontal passage for Tuesday evening, with increased NWly breezes and falling dewpoint temps. However dry weather is expected to accompany the front and in the intervening hours behind its passage. Lows mainly in the 40s.
LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/
Key Messages:
* Warmer and drier Wednesday and Thursday with mostly clear skies.
* Pattern becomes more unsettled Friday through the weekend with periodic chances for precipitation.
Wednesday through Weekend:
A cold front moves through Tuesday night into early Wednesday morning, bringing a slightly cooler and drier airmass to southern New England. Wednesday trends slightly cooler than Tuesday, although still warmer than normal overall. Highs range in the 50s for the Cape/Island and high 60s for the interior. Light NW winds expected under broad high pressure with localized sea breezes in the afternoon for the coastal areas.
A similar pattern stays in place through the end of the week with zonal flow and 850mb temperature anomalies signaling at slightly above normal temperatures. Ensemble guidance shows a transition to a more unsettled pattern Friday into the weekend.
Heights fall across the region ahead of an upper level trough moving over the Great Lakes. A weaker leading shortwave moves through Friday evening with the main trough moving through by the end of the weekend. This will bring a few rounds of spotty showers to the area; however, still need to iron out the details with the timing/chances of the first wave of showers on Friday. A more consistent round of rain moves in overnight through Saturday. Slightly cooler for the weekend as temperatures range around normal. Conditions gradually drying out for Sunday.
AVIATION /05Z TUESDAY THROUGH SATURDAY/
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
06z TAF Update:
Through 12Z: Moderate confidence.
VFR east to start. Categories then continue to deteriorate to MVFR, potentially IFR through 08z from W to E, in 4-6 SM -SHRA and ceilings 010-020. Confidence in IFR is low. -SHRA should be ongoing from ORH east by end of this period, while trending dry for BAF/BDL. S winds around 10 kt, with areas of low level shear as SW jet of 40 kt moves overhead.
Today: High confidence in trends but moderate on timing.
MVFR/IFR cigs early, quickly scattering out to VFR 13-16z. It may take longer for south-coastal/Cape airports to scatter out to VFR and showed MVFR-IFR ceilings thru at least 18z before trending to VFR. SW winds around 5-10 kt then shift to WSW/W around 10 kt, with occasional gusts to 20 kt for the interior.
Tonight: High confidence.
VFR. WNW winds around 5-10 kt.
Wednesday: High confidence.
VFR. Light NW winds 5-10 kts.
KBOS TAF...High confidence in TAF. VFR thru 07z, then categories trend to MVFR with light showers. Improvement to VFR anticipated by 15-16z.
KBDL TAF...High confidence in TAF. Improvement to VFR anticipated by 12-13z.
Outlook /Wednesday Night through Saturday/...
Tuesday Night: VFR. Breezy.
Wednesday through Thursday Night: VFR.
Friday: VFR. Breezy.
Friday Night: Mainly VFR, with local MVFR possible. Breezy.
Chance SHRA.
Saturday: Mainly MVFR, with local VFR possible. Breezy. SHRA likely.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Tonight through Tuesday Night: High confidence.
Generally tranquil boating conditions through early tonight with SE to S winds around 10-15 kt and seas 2-3 ft. Winds then become S/SW around 15-20 kt tonight into Tuesday with passing rain showers. SW gusts could reach near 25 kt over the far southeast offshore waters, before becoming west late Tuesday night.
Seas also begin to build to around 4 ft overnight tonight, perhaps near 5 ft over the southern offshore waters. Seas continue around that range through Tuesday night.
With the potential for limited mixing over the waters as a mild airmass moves overhead, it will be close but felt conditions were borderline for SCAs and refrained from hoisting at this time. Later shifts could consider one to cover the Tuesday timeframe if winds or seas increase further, but this does not seem likely.
Outlook /Wednesday Night through Saturday/...
Tuesday Night: Winds less than 25 kt. Seas locally approaching 5 ft.
Wednesday through Friday: Winds less than 25 kt.
Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers.
Saturday: Low risk for Small Craft Advisory winds with gusts up to 20 kt. Seas up to 5 ft. Rain showers likely.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
Area Forecast Discussion National Weather Service Boston/Norton MA 111 AM EDT Tue Apr 22 2025
SYNOPSIS
A warm front will spread increased cloudiness into Southern New England through tonight, with passing showers around and after midnight. Rain showers then taper off early on Tuesday with decreasing cloudiness in most areas toward mild temperatures in the 60s to low 70s, but cloud cover may linger into the afternoon for the southern coast with cooler temperatures. Mild and dry weather for the rest of the workweek, before our weather pattern turns more unsettled again around the weekend.
NEAR TERM /UNTIL 6 AM THIS MORNING/
Key Messages:
* Turning overcast tonight, with periods of rain showers around and after midnight.
* Rain showers taper off overnight in western New England, but may linger into the pre-dawn hours in eastern New England.
* Lows mid 40s to around 50.
Details:
Although we started the day with full sunshine with coastal seabreezes, we're starting to see increased cloud cover in most areas west of I-495 in MA. This is associated with increased moisture from a warm front which trails from northern VT through western RI; warm sector regime currently confined to much of the eastern Gt Lakes, central/southern NY and western MA/CT precedes a cold front now working its way through the Ohio Valley.
Cloud cover will only continue to gradually increase through tonight and overnight, although many areas to remain dry thru midnight. Rain showers then move into western New England around midnight, then slowly progressing eastward into eastern MA and RI toward the pre- dawn hours. Precipitable water values increase to around 1.2" with the increased SW flow aloft; wouldn't rule out some very brief downpours in a few showers but they're expected to pass through with little overall fanfare. Through early Tuesday morning we should see areal-average rain amts of up to a quarter-inch. Rain showers should be coming to an end west of Worcester close to daybreak while continuing into eastern MA, RI and the Cape and Islands. With the warm advection (925 mb temps warm to around +12C) and increased cloud cover, sided low temps toward milder side of guidance into the mid to upper 40s.
SHORT TERM /6 AM THIS MORNING THROUGH 6 PM WEDNESDAY/
Key Messages:
* Overcast to start Tue; improvement away from the coastlines by mid morning, but it may take until the afternoon before peeks of sun break out for the South Coast, Cape and Islands. Temps range from mid 60s to low 70s away from the southern coast, but only in the 50s to low 60s south coast, Cape/Islands.
* Dry cold frontal passage Tue night, with modest NW breezes.
Seasonable lows in the mid 40s.
Tuesday and Tuesday Night:
Rain showers from the overnight will be progressing off to the east and offshore thru the early to mid morning hours. So while we start off the day with overcast conditions, expect decreasing cloud cover and warming temperatures away from the coasts into the 60s to low 70s. Forecast challenge for Tuesday resides along the south coast, Cape and Islands; very limited mixing is progged given the cooler marine boundary layer with moisture trapped beneath the warm airmass aloft. This is visualized in forecast soundings at New Bedford, Westerly, Falmouth/Hyannis and Nantucket. It could be quite a while, potentially into the afternoon, before low clouds begin to erode given those profiles. and that would cut into how warm temperatures may get for the southern coast, with cooler SWly onshore flow for these locations as well. Thus opted for highs only in the 50s, perhaps near 60. If cloud cover does scatter out earlier, then temps would be too cool and could reach up into low to mid 60s.
We then get a dry cold frontal passage for Tuesday evening, with increased NWly breezes and falling dewpoint temps. However dry weather is expected to accompany the front and in the intervening hours behind its passage. Lows mainly in the 40s.
LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/
Key Messages:
* Warmer and drier Wednesday and Thursday with mostly clear skies.
* Pattern becomes more unsettled Friday through the weekend with periodic chances for precipitation.
Wednesday through Weekend:
A cold front moves through Tuesday night into early Wednesday morning, bringing a slightly cooler and drier airmass to southern New England. Wednesday trends slightly cooler than Tuesday, although still warmer than normal overall. Highs range in the 50s for the Cape/Island and high 60s for the interior. Light NW winds expected under broad high pressure with localized sea breezes in the afternoon for the coastal areas.
A similar pattern stays in place through the end of the week with zonal flow and 850mb temperature anomalies signaling at slightly above normal temperatures. Ensemble guidance shows a transition to a more unsettled pattern Friday into the weekend.
Heights fall across the region ahead of an upper level trough moving over the Great Lakes. A weaker leading shortwave moves through Friday evening with the main trough moving through by the end of the weekend. This will bring a few rounds of spotty showers to the area; however, still need to iron out the details with the timing/chances of the first wave of showers on Friday. A more consistent round of rain moves in overnight through Saturday. Slightly cooler for the weekend as temperatures range around normal. Conditions gradually drying out for Sunday.
AVIATION /05Z TUESDAY THROUGH SATURDAY/
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
06z TAF Update:
Through 12Z: Moderate confidence.
VFR east to start. Categories then continue to deteriorate to MVFR, potentially IFR through 08z from W to E, in 4-6 SM -SHRA and ceilings 010-020. Confidence in IFR is low. -SHRA should be ongoing from ORH east by end of this period, while trending dry for BAF/BDL. S winds around 10 kt, with areas of low level shear as SW jet of 40 kt moves overhead.
Today: High confidence in trends but moderate on timing.
MVFR/IFR cigs early, quickly scattering out to VFR 13-16z. It may take longer for south-coastal/Cape airports to scatter out to VFR and showed MVFR-IFR ceilings thru at least 18z before trending to VFR. SW winds around 5-10 kt then shift to WSW/W around 10 kt, with occasional gusts to 20 kt for the interior.
Tonight: High confidence.
VFR. WNW winds around 5-10 kt.
Wednesday: High confidence.
VFR. Light NW winds 5-10 kts.
KBOS TAF...High confidence in TAF. VFR thru 07z, then categories trend to MVFR with light showers. Improvement to VFR anticipated by 15-16z.
KBDL TAF...High confidence in TAF. Improvement to VFR anticipated by 12-13z.
Outlook /Wednesday Night through Saturday/...
Tuesday Night: VFR. Breezy.
Wednesday through Thursday Night: VFR.
Friday: VFR. Breezy.
Friday Night: Mainly VFR, with local MVFR possible. Breezy.
Chance SHRA.
Saturday: Mainly MVFR, with local VFR possible. Breezy. SHRA likely.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Tonight through Tuesday Night: High confidence.
Generally tranquil boating conditions through early tonight with SE to S winds around 10-15 kt and seas 2-3 ft. Winds then become S/SW around 15-20 kt tonight into Tuesday with passing rain showers. SW gusts could reach near 25 kt over the far southeast offshore waters, before becoming west late Tuesday night.
Seas also begin to build to around 4 ft overnight tonight, perhaps near 5 ft over the southern offshore waters. Seas continue around that range through Tuesday night.
With the potential for limited mixing over the waters as a mild airmass moves overhead, it will be close but felt conditions were borderline for SCAs and refrained from hoisting at this time. Later shifts could consider one to cover the Tuesday timeframe if winds or seas increase further, but this does not seem likely.
Outlook /Wednesday Night through Saturday/...
Tuesday Night: Winds less than 25 kt. Seas locally approaching 5 ft.
Wednesday through Friday: Winds less than 25 kt.
Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers.
Saturday: Low risk for Small Craft Advisory winds with gusts up to 20 kt. Seas up to 5 ft. Rain showers likely.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| BHBM3 - 8443970 - Boston, MA | 1 mi | 55 min | 49°F | 30.05 | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 22 mi | 45 min | SSE 7.8G | 45°F | 43°F | 30.08 | 40°F | |
| 44029 - Buoy A0102 - Mass. Bay/Stellwagen | 28 mi | 111 min | S 12G | 44°F | 2 ft | 30.08 | ||
| FOXR1 - 8454000 - Providence, RI | 43 mi | 55 min | S 8.9G | 49°F | 47°F | 30.08 | ||
| PVDR1 | 44 mi | 55 min | S 12G | 49°F | 30.09 | |||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 46 mi | 55 min | SSW 5.1G | 51°F | 30.09 | |||
| FRVM3 - 8447386 - Fall River, MA | 46 mi | 55 min | 51°F | 51°F | 30.09 | |||
| FRXM3 | 47 mi | 55 min | 51°F | 38°F | ||||
| IOSN3 - Isle of Shoals, NH | 47 mi | 55 min | SSE 13G | 44°F | 30.06 | 35°F | ||
| CPTR1 - 8452944 - Conimicut Light, RI | 48 mi | 55 min | S 15G | 47°F | 50°F | 30.08 | ||
| BGXN3 - Great Bay Reserve, NH | 49 mi | 70 min | ESE 1.9 | 47°F | 34°F |
Wind History for Providence, RI
toggle option: (graph/table)
| Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Air | DewPt | RH | inHg |
| KBOS GENERAL EDWARD LAWRENCE LOGAN INTL,MA | 3 sm | 60 min | SSW 09 | 10 sm | Overcast | 48°F | 37°F | 66% | 30.06 | |
| KBED LAURENCE G HANSCOM FLD,MA | 14 sm | 63 min | S 03 | 10 sm | Overcast | 48°F | 36°F | 62% | 30.05 | |
| KOWD NORWOOD MEMORIAL,MA | 14 sm | 61 min | SSW 05 | 10 sm | Overcast | 50°F | 37°F | 62% | 30.06 | |
| KBVY BEVERLY RGNL,MA | 16 sm | 61 min | S 07 | 10 sm | Overcast | 48°F | 36°F | 62% | 30.06 | |
| KLWM LAWRENCE MUNI,MA | 24 sm | 60 min | S 05 | 10 sm | Overcast | 48°F | 34°F | 57% | 30.07 |
Link to 1 hour of 5 minute data for KBOS
Terminal Aerodrome Forecast (TAF) for KBOS
Wind History Graph: BOS
(wind in knots)
GEOS Local Image of north east
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Boston, MA,
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