Marine Weather and Tide Forecast for Chelsea, MA
May 4, 2024 11:41 AM EDT (15:41 UTC) Change Location
 | Sunrise 5:32 AM Sunset 7:49 PM Moonrise 3:47 AM Moonset 3:45 PM |
ANZ230 Boston Harbor- 1004 Am Edt Sat May 4 2024
This afternoon - E winds around 10 kt. Waves 1 foot or less.
Tonight - E winds 5 to 10 kt. Waves 1 foot or less.
Sun - SE winds 5 to 10 kt. Waves 1 foot or less. A chance of rain in the afternoon.
Sun night - S winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. Patchy fog. Showers. Vsby 1 to 3 nm after midnight.
Mon - SW winds around 10 kt. Waves 1 foot or less. Showers likely, mainly in the morning. Patchy fog in the morning with vsby 1 nm or less.
Mon night - SW winds around 10 kt, becoming nw after midnight. Waves 1 foot or less.
Tue and Tue night - NE winds 5 to 10 kt, becoming s. Waves 1 foot or less.
Wed and Wed night - SE winds 5 to 10 kt. Waves around 2 ft. A chance of 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 1004 Am Edt Sat May 4 2024
Synopsis for massachusetts and rhode island coastal waters - High pressure remains anchored over new england and the nearby coastal waters through Sunday. A weak cold front then moves across new england Monday and offshore Monday night. Weak high pressure builds back over the area Tuesday. A series of weak lows then pass over or just south of new england mid to late next week.
Area Discussion for - Boston, MA
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FXUS61 KBOX 041300 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 900 AM EDT Sat May 4 2024
SYNOPSIS
High pressure brings dry weather with cooler onshore breezes Saturday. A slow-moving frontal boundary brings widespread showers Sunday into early Monday. Then gradual clearing Monday afternoon along with warming temperatures. Tuesday looks to be the pick of the week, with abundant sunshine and highs in the 70s to near 80, although significantly cooler near the coast with afternoon seabreezes. Then lots of clouds Wed, Thu and Fri along with periodic showers possible.
NEAR TERM /UNTIL 6 PM THIS EVENING/
9 AM Update
* Partly Sunny with some increasing clouds into the afternoon * Highs lower 50s coast, 60+ inland and near 70 lower CT Rvr
Previous forecast is on track. High pressure across the Canadian Maritimes will continue to generate a low level easterly flow of air across southern New England
Therefore
we will have a large range in temperatures across the region. Highs should range from the lower 50s along the immediate coast...but 60+ not too far inland and near 70 in the lower CT River Valley.
Dry weather with partly sunny skies are anticipated through the afternoon with upper level ridging in control. We do expect some lower clouds to invade areas near the coast and some higher clouds to overspread the region from the west through the afternoon.
SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/
Tonight
Overcast skies fill back in overnight as the boundary layer cools.
This will limit temperatures from falling to far, so expect seasonable low temps in the low to mid 40s across much of the region. High pressure drops to the southeast which will result in easterly winds gradually shifting to the southeast as we approach the dawn hours.
Tomorrow
Winds shift from southeast to south during the day tomorrow allowing for a surge of moisture across the region. This will support increasing moisture with PWATs rising close to an inch across the region. Precip chances increase gradually from west to east across the region as northern stream short wave energy traverses over The Northeast. Latest suite of model guidance suggests shower chances will peak during the mid-afternoon hours with the steadiest precipitation taking place tomorrow night (see long-term AFD). Skies will be overcast for much of the day tomorrow which will support cooler temperature sin the mid to upper 50s across the region.
LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/
Highlights:
* Cool with rain Sunday into early Mon, then gradual clearing Monday afternoon, although clouds may linger over southeast MA
* Tue looks to be the pick of the week, with abundant sunshine and highs in the 70s to near 80, although much cooler at the coast
* Lots of clouds Wed, Thu & Fri along with the risk of periodic showers and cooler
Temperatures...
Warm westerly flow aloft Monday with 850 mb temps well above normal, about +11C at 18z. Timing of clearing will be crucial to temp forecast. Ensembles supporting 80-100% probability of 70+ highs Monday in the CT River Valley and Merrimack River Valley. More uncertainty southeast across RI and southeast MA given departure timing of clouds. Not quite as warm aloft Tue, but still above normal with +8C to +9C at 850 mb, but warmer blyr temps of +16 to +17C at 925 mb, along with NW winds providing downslope flow. This results in ensembles offering 90-100% probabilities of 70+ highs away from the coastline, where afternoon seabreezes will yield cooler temps. Farther inland, not out of the question a few towns make a run at 80 degs! This combined with abundant sunshine, low dew pts/low RH likely results in Tue being the pick of the week.
Not as warm Wed, Thu and Fri with frontal boundary getting hung up over or near SNE, along with possible waves of low pressure tracking south of the region. Highs likely in the 60s, except 50s along the coast, including Cape Cod and the Islands.
Precipitation...
Height falls and associated cold front will combine with good moisture advection (PWATs +2 sigma) to yield widespread showers Sunday afternoon thru Monday morning across southeast MA. High probability for 0.10 to 0.25 inches of rainfall during this time, with low probs up to 0.50 inches. Clearing develops NW to SE during Monday afternoon (last across SE MA) as the dry slot overspreads the region. With diurnal heating, weak cyclonic flow aloft and surface front lingering over the region, low probability of a few showers and/or an isolated thunderstorm late in the day across the interior, where duration of heating/sunshine will be greatest.
Dry weather Tuesday with PWATs only about 60% of normal. Then becoming unsettled Wed, Thu and possibly Fri, along with a low confidence forecast. Negative height anomaly downstream over Newfoundland keeps a ridge axis with above normal heights from the Mid Atlantic into New England. Meanwhile, a positive tilt trough over the high plains ejects multiple plumes of moisture towards New England. Models struggling with the large scale flow, specifically how much of this moisture advects east into SNE, or dampens out running into the ridge or is shunted southeast of New England? Nonetheless, chance of showers both Wed, Thu and Fri. Although, there will also be periods of dry weather during this time period.
AVIATION /13Z SATURDAY THROUGH WEDNESDAY/
Forecast Confidence Levels:
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
12z TAF Update:
Through 12Z: High confidence, only low confidence for the immediate eastern MA coast, as low clouds come onshore this morning. Thining marginal IFR/MVFR clouds will be confined to the immediate coast, then lift to VFR cloud bases farther inland away from the coast. Earlier discussion below.
-----------------------------------------------------------------
VFR conditions persist through 12Z with light and variable winds becoming more steady out of the east/northeast by sunrise.
Today...Moderate confidence
MVFR level cloud bases move onshore this morning from the east, but there is a bit of uncertainty with respect to sky cover.
Humidity in the low levels is choppy, so coverage may range from SCT to BKN at times. So expect intermittent periods of MVFR ceilings for the first half of the day until the skies fill into BKN/OVC buy mid-afternoon/evening. Steady east/northeast winds from 5 to 10 knots.
Tonight...High Confidence
MVFR/IFR ceilings return overnight with continued light easterly winds. Winds becoming more east/southeasterly by 12Z Sunday.
Tomorrow...High Confidence
MVFR borderline IFR ceilings for most of the day tomorrow with -RA spreading from west to east during the day. Southeast winds becoming more southerly by the afternoon.
KBOS TAF...Moderate Confidence
High confidence in MVFR cloud bases, but less confidence in coverage. There may be intermittent periods of SCT/BKN VFR/MVFR ceilings.
KBDL TAF...High confidence in TAF.
Outlook /Sunday Night through Wednesday/...
Sunday Night: MVFR/IFR conditions possible. SHRA likely.
Monday: Mainly VFR, with local IFR possible. Chance SHRA.
Monday Night through Tuesday: VFR. Slight chance SHRA.
Tuesday Night: VFR. Chance SHRA.
Wednesday: Mainly VFR, with areas MVFR possible. Breezy. Chance SHRA, isolated TSRA.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Marine
Today through Tomorrow
Conditions remain on the calm and quiet side across the coastal waters through the weekend with high pressure largely in control.
Easterly winds today become more southeasterly overnight and eventually southerly by Sunday. Seas generally in the 1 to 3 foot range.
Outlook /Sunday Night through Wednesday/...
Sunday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Rain showers likely.
Monday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers.
Monday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers.
Tuesday: Winds less than 25 kt. Slight chance of rain showers.
Tuesday Night through Wednesday: Winds less than 25 kt. Chance of rain showers.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
Area Forecast Discussion National Weather Service Boston/Norton MA 900 AM EDT Sat May 4 2024
SYNOPSIS
High pressure brings dry weather with cooler onshore breezes Saturday. A slow-moving frontal boundary brings widespread showers Sunday into early Monday. Then gradual clearing Monday afternoon along with warming temperatures. Tuesday looks to be the pick of the week, with abundant sunshine and highs in the 70s to near 80, although significantly cooler near the coast with afternoon seabreezes. Then lots of clouds Wed, Thu and Fri along with periodic showers possible.
NEAR TERM /UNTIL 6 PM THIS EVENING/
9 AM Update
* Partly Sunny with some increasing clouds into the afternoon * Highs lower 50s coast, 60+ inland and near 70 lower CT Rvr
Previous forecast is on track. High pressure across the Canadian Maritimes will continue to generate a low level easterly flow of air across southern New England
Therefore
we will have a large range in temperatures across the region. Highs should range from the lower 50s along the immediate coast...but 60+ not too far inland and near 70 in the lower CT River Valley.
Dry weather with partly sunny skies are anticipated through the afternoon with upper level ridging in control. We do expect some lower clouds to invade areas near the coast and some higher clouds to overspread the region from the west through the afternoon.
SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/
Tonight
Overcast skies fill back in overnight as the boundary layer cools.
This will limit temperatures from falling to far, so expect seasonable low temps in the low to mid 40s across much of the region. High pressure drops to the southeast which will result in easterly winds gradually shifting to the southeast as we approach the dawn hours.
Tomorrow
Winds shift from southeast to south during the day tomorrow allowing for a surge of moisture across the region. This will support increasing moisture with PWATs rising close to an inch across the region. Precip chances increase gradually from west to east across the region as northern stream short wave energy traverses over The Northeast. Latest suite of model guidance suggests shower chances will peak during the mid-afternoon hours with the steadiest precipitation taking place tomorrow night (see long-term AFD). Skies will be overcast for much of the day tomorrow which will support cooler temperature sin the mid to upper 50s across the region.
LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/
Highlights:
* Cool with rain Sunday into early Mon, then gradual clearing Monday afternoon, although clouds may linger over southeast MA
* Tue looks to be the pick of the week, with abundant sunshine and highs in the 70s to near 80, although much cooler at the coast
* Lots of clouds Wed, Thu & Fri along with the risk of periodic showers and cooler
Temperatures...
Warm westerly flow aloft Monday with 850 mb temps well above normal, about +11C at 18z. Timing of clearing will be crucial to temp forecast. Ensembles supporting 80-100% probability of 70+ highs Monday in the CT River Valley and Merrimack River Valley. More uncertainty southeast across RI and southeast MA given departure timing of clouds. Not quite as warm aloft Tue, but still above normal with +8C to +9C at 850 mb, but warmer blyr temps of +16 to +17C at 925 mb, along with NW winds providing downslope flow. This results in ensembles offering 90-100% probabilities of 70+ highs away from the coastline, where afternoon seabreezes will yield cooler temps. Farther inland, not out of the question a few towns make a run at 80 degs! This combined with abundant sunshine, low dew pts/low RH likely results in Tue being the pick of the week.
Not as warm Wed, Thu and Fri with frontal boundary getting hung up over or near SNE, along with possible waves of low pressure tracking south of the region. Highs likely in the 60s, except 50s along the coast, including Cape Cod and the Islands.
Precipitation...
Height falls and associated cold front will combine with good moisture advection (PWATs +2 sigma) to yield widespread showers Sunday afternoon thru Monday morning across southeast MA. High probability for 0.10 to 0.25 inches of rainfall during this time, with low probs up to 0.50 inches. Clearing develops NW to SE during Monday afternoon (last across SE MA) as the dry slot overspreads the region. With diurnal heating, weak cyclonic flow aloft and surface front lingering over the region, low probability of a few showers and/or an isolated thunderstorm late in the day across the interior, where duration of heating/sunshine will be greatest.
Dry weather Tuesday with PWATs only about 60% of normal. Then becoming unsettled Wed, Thu and possibly Fri, along with a low confidence forecast. Negative height anomaly downstream over Newfoundland keeps a ridge axis with above normal heights from the Mid Atlantic into New England. Meanwhile, a positive tilt trough over the high plains ejects multiple plumes of moisture towards New England. Models struggling with the large scale flow, specifically how much of this moisture advects east into SNE, or dampens out running into the ridge or is shunted southeast of New England? Nonetheless, chance of showers both Wed, Thu and Fri. Although, there will also be periods of dry weather during this time period.
AVIATION /13Z SATURDAY THROUGH WEDNESDAY/
Forecast Confidence Levels:
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
12z TAF Update:
Through 12Z: High confidence, only low confidence for the immediate eastern MA coast, as low clouds come onshore this morning. Thining marginal IFR/MVFR clouds will be confined to the immediate coast, then lift to VFR cloud bases farther inland away from the coast. Earlier discussion below.
-----------------------------------------------------------------
VFR conditions persist through 12Z with light and variable winds becoming more steady out of the east/northeast by sunrise.
Today...Moderate confidence
MVFR level cloud bases move onshore this morning from the east, but there is a bit of uncertainty with respect to sky cover.
Humidity in the low levels is choppy, so coverage may range from SCT to BKN at times. So expect intermittent periods of MVFR ceilings for the first half of the day until the skies fill into BKN/OVC buy mid-afternoon/evening. Steady east/northeast winds from 5 to 10 knots.
Tonight...High Confidence
MVFR/IFR ceilings return overnight with continued light easterly winds. Winds becoming more east/southeasterly by 12Z Sunday.
Tomorrow...High Confidence
MVFR borderline IFR ceilings for most of the day tomorrow with -RA spreading from west to east during the day. Southeast winds becoming more southerly by the afternoon.
KBOS TAF...Moderate Confidence
High confidence in MVFR cloud bases, but less confidence in coverage. There may be intermittent periods of SCT/BKN VFR/MVFR ceilings.
KBDL TAF...High confidence in TAF.
Outlook /Sunday Night through Wednesday/...
Sunday Night: MVFR/IFR conditions possible. SHRA likely.
Monday: Mainly VFR, with local IFR possible. Chance SHRA.
Monday Night through Tuesday: VFR. Slight chance SHRA.
Tuesday Night: VFR. Chance SHRA.
Wednesday: Mainly VFR, with areas MVFR possible. Breezy. Chance SHRA, isolated TSRA.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Marine
Today through Tomorrow
Conditions remain on the calm and quiet side across the coastal waters through the weekend with high pressure largely in control.
Easterly winds today become more southeasterly overnight and eventually southerly by Sunday. Seas generally in the 1 to 3 foot range.
Outlook /Sunday Night through Wednesday/...
Sunday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Rain showers likely.
Monday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers.
Monday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers.
Tuesday: Winds less than 25 kt. Slight chance of rain showers.
Tuesday Night through Wednesday: Winds less than 25 kt. Chance of rain showers.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | inHg | DewPt |
| BHBM3 - 8443970 - Boston, MA | 1 mi | 53 min | 50°F | 30.38 | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 22 mi | 41 min | ENE 9.7G | 47°F | 47°F | 30.39 | 42°F | |
| 44029 - Buoy A0102 - Mass. Bay/Stellwagen | 28 mi | 97 min | E 12G | 47°F | 47°F | 2 ft | 30.37 | |
| FOXR1 - 8454000 - Providence, RI | 43 mi | 53 min | ENE 7G | 56°F | 49°F | 30.35 | ||
| PVDR1 | 44 mi | 53 min | NE 7G | 59°F | 30.36 | 46°F | ||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 46 mi | 53 min | NE 6G | 56°F | 30.35 | |||
| FRVM3 - 8447386 - Fall River, MA | 46 mi | 53 min | 56°F | 52°F | 30.36 | |||
| FRXM3 | 47 mi | 53 min | 55°F | 46°F | ||||
| IOSN3 - Isle of Shoals, NH | 47 mi | 41 min | ENE 7G | 47°F | 30.37 | 39°F | ||
| CPTR1 - 8452944 - Conimicut Light, RI | 48 mi | 53 min | NNE 7G | 56°F | 54°F | 30.35 | ||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 49 mi | 61 min | 48°F | 3 ft | ||||
| BGXN3 - Great Bay Reserve, NH | 49 mi | 116 min | ENE 5.1 | 52°F | 30.39 | 43°F |
toggle option: (graph/table)
Airport Reports
EDIT (hide/show) Help Click EDIT to display multiple airports. Follow links for more data.| Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Temp | DewPt | RH | inHg |
| KBOS GENERAL EDWARD LAWRENCE LOGAN INTL,MA | 3 sm | 47 min | E 10 | 10 sm | Mostly Cloudy | 52°F | 45°F | 76% | 30.38 | |
| KBED LAURENCE G HANSCOM FLD,MA | 14 sm | 50 min | SE 09 | 10 sm | Overcast | 54°F | 45°F | 71% | 30.35 | |
| KOWD NORWOOD MEMORIAL,MA | 14 sm | 40 min | NE 08 | 10 sm | Overcast | 57°F | 45°F | 63% | 30.37 | |
| KBVY BEVERLY RGNL,MA | 16 sm | 19 min | NE 08 | 10 sm | Overcast | 52°F | 45°F | 76% | 30.38 | |
| KLWM LAWRENCE MUNI,MA | 24 sm | 26 min | ENE 07 | 10 sm | Overcast | 54°F | 43°F | 67% | 30.39 |
Tide / Current for Charlestown Bridge, Charles River, Massachusetts
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Charlestown Bridge
Click for Map
Sat -- 02:17 AM EDT 0.59 feet Low Tide
Sat -- 03:47 AM EDT Moonrise
Sat -- 05:34 AM EDT Sunrise
Sat -- 08:29 AM EDT 10.16 feet High Tide
Sat -- 02:47 PM EDT -0.07 feet Low Tide
Sat -- 03:45 PM EDT Moonset
Sat -- 07:47 PM EDT Sunset
Sat -- 09:03 PM EDT 10.41 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 02:17 AM EDT 0.59 feet Low Tide
Sat -- 03:47 AM EDT Moonrise
Sat -- 05:34 AM EDT Sunrise
Sat -- 08:29 AM EDT 10.16 feet High Tide
Sat -- 02:47 PM EDT -0.07 feet Low Tide
Sat -- 03:45 PM EDT Moonset
Sat -- 07:47 PM EDT Sunset
Sat -- 09:03 PM EDT 10.41 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Charlestown Bridge, Charles River, Massachusetts, Tide feet
| 12 am |
| 3.8 |
| 1 am |
| 1.8 |
| 2 am |
| 0.7 |
| 3 am |
| 1 |
| 4 am |
| 2.4 |
| 5 am |
| 4.5 |
| 6 am |
| 6.7 |
| 7 am |
| 8.8 |
| 8 am |
| 10 |
| 9 am |
| 10 |
| 10 am |
| 8.8 |
| 11 am |
| 6.9 |
| 12 pm |
| 4.6 |
| 1 pm |
| 2.2 |
| 2 pm |
| 0.4 |
| 3 pm |
| -0 |
| 4 pm |
| 1 |
| 5 pm |
| 2.9 |
| 6 pm |
| 5.3 |
| 7 pm |
| 7.7 |
| 8 pm |
| 9.7 |
| 9 pm |
| 10.4 |
| 10 pm |
| 9.9 |
| 11 pm |
| 8.3 |
Boston Harbor
Click for Map
Sat -- 02:16 AM EDT 0.00 knots Slack
Sat -- 03:46 AM EDT Moonrise
Sat -- 05:09 AM EDT 1.10 knots Max Flood
Sat -- 05:34 AM EDT Sunrise
Sat -- 08:02 AM EDT -0.00 knots Slack
Sat -- 12:11 PM EDT -1.17 knots Max Ebb
Sat -- 02:42 PM EDT 0.00 knots Slack
Sat -- 03:44 PM EDT Moonset
Sat -- 05:48 PM EDT 1.23 knots Max Flood
Sat -- 07:47 PM EDT Sunset
Sat -- 08:39 PM EDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 02:16 AM EDT 0.00 knots Slack
Sat -- 03:46 AM EDT Moonrise
Sat -- 05:09 AM EDT 1.10 knots Max Flood
Sat -- 05:34 AM EDT Sunrise
Sat -- 08:02 AM EDT -0.00 knots Slack
Sat -- 12:11 PM EDT -1.17 knots Max Ebb
Sat -- 02:42 PM EDT 0.00 knots Slack
Sat -- 03:44 PM EDT Moonset
Sat -- 05:48 PM EDT 1.23 knots Max Flood
Sat -- 07:47 PM EDT Sunset
Sat -- 08:39 PM EDT -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Boston Harbor, Massachusetts Current, knots
| 12 am |
| -1.1 |
| 1 am |
| -0.9 |
| 2 am |
| -0.2 |
| 3 am |
| 0.6 |
| 4 am |
| 1 |
| 5 am |
| 1.1 |
| 6 am |
| 1 |
| 7 am |
| 0.7 |
| 8 am |
| 0 |
| 9 am |
| -0.5 |
| 10 am |
| -0.9 |
| 11 am |
| -1.1 |
| 12 pm |
| -1.2 |
| 1 pm |
| -1.1 |
| 2 pm |
| -0.6 |
| 3 pm |
| 0.3 |
| 4 pm |
| 1 |
| 5 pm |
| 1.2 |
| 6 pm |
| 1.2 |
| 7 pm |
| 1 |
| 8 pm |
| 0.4 |
| 9 pm |
| -0.2 |
| 10 pm |
| -0.7 |
| 11 pm |
| -1 |
Boston, MA,
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