Marine Weather and Tide Forecast for Plymouth, MA
May 5, 2024 6:14 PM EDT (22:14 UTC) Change Location
 | Sunrise 5:31 AM Sunset 7:48 PM Moonrise 4:07 AM Moonset 5:00 PM |
ANZ231 Cape Cod Bay- 403 Pm Edt Sun May 5 2024
Tonight - S winds around 10 kt. Seas around 2 ft. Wave detail: E 2 ft at 7 seconds and S 1 ft at 2 seconds. Patchy fog. Showers. Vsby 1 nm or less after midnight.
Mon - SW winds around 10 kt. Gusts up to 20 kt in the morning. Seas around 2 ft. Wave detail: E 2 ft at 9 seconds and sw 1 ft at 3 seconds. Patchy fog. Showers likely in the morning. Vsby 1 nm or less, increasing to 1 to 3 nm in the afternoon.
Mon night - SW winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft. Wave detail: E 2 ft at 10 seconds and sw 1 ft at 2 seconds. A chance of showers in the evening. Patchy fog after midnight with vsby 1 to 3 nm.
Tue - N winds around 5 kt, becoming E in the afternoon. Seas around 2 ft. Wave detail: E 2 ft at 10 seconds and nw 1 ft at 2 seconds. Patchy fog in the morning with vsby 1 to 3 nm.
Tue night - S winds 5 to 10 kt. Seas 1 foot or less. Wave detail: S 1 ft at 2 seconds and E 1 ft at 9 seconds. A chance of showers after midnight.
Wed and Wed night - N winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft. Wave detail: S 1 ft at 2 seconds and E 1 ft at 7 seconds. A chance of showers.
Thu - NE winds around 10 kt. Seas around 2 ft. A chance of showers.
Thu night - E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Showers likely.
Fri and Fri night - E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 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 403 Pm Edt Sun May 5 2024
Synopsis for massachusetts and rhode island coastal waters - High pressure begins to move east tonight, but dry weather remains through Sunday morning. Weak low pressure and its attending cold front brings rain Sunday afternoon through Monday morning. Dry weather returns Monday evening through Tuesday. Then a frontal boundary sets up over or just south of new england Wednesday into next weekend. A series of lows will likely traverse this front, bringing periods of rain, fog and onshore flow.
Area Discussion for - Boston, MA
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FXUS61 KBOX 051936 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 336 PM EDT Sun May 5 2024
SYNOPSIS
A period of widespread showers impacts the region tonight with the focus for them this evening. Partial sunshine develops on Monday with much warmer temperatures. A brief band of scattered showers is expected Monday afternoon/evening...but the majority of the time will feature dry weather. Tuesday will be the pick of the week with abundant sunshine and above normal temperatures. Unsettled pattern develops for Wednesday and beyond with below normal temperatures. Some uncertainty revolves around the weekend forecast.
NEAR TERM /UNTIL 6 AM MONDAY MORNING/
335 PM Update...
* Period of widespread showers tonight with the focus this evening * Low temps between 45 and 50 with areas of fog developing
Approaching shortwave/mid level warm front was inducing a modest southwest low level jet this afternoon. This has allowed a band of widespread showers to overspread areas northwest of I-95. This band of showers will gradually sink southeast and impact the Boston to Providence corridor by late afternoon/early evening. Once the steady showers arrive they should generally last between 3 and 6 hours. The bulk of the showers will come to an end northwest of I-95 near or shortly after midnight...but linger towards the Cape and Islands.
Overnight low temps should only drop a few degrees from their current readings...mainly in the 45 to 50 degree range. We do expect some fog to develop overnight given increasing low level moisture with light southerly flow.
SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/
Key Points...
* Partial sunshine developing away from south coast Monday * Turning much warmer with highs well into the 70s for most on Monday * Scattered brief showers Mon PM, but most of the time it will be dry
Details...
Monday and Monday night...
Any lingering showers towards the Cape/Islands should come to an end Monday morning as the shortwave departs. Subsidence and enough westerly flow aloft should allow for partial sunshine to develop.
Temperatures will quickly respond give 850T near +10C. It will be much warmer than today with highs well up into the 70s. May even feel a tad humid given dewpoints in the upper 50s to near 60...so quite the change. It will be cooler near the south coast, Cape and Islands where low clouds and fog patches may linger.
The vast majority of Monday will feature dry weather
However
a cold front dropping south will probably result in a band of brief scattered showers dropping south Monday afternoon and evening. There probably will be a few hundred J/KG of Cape developing...but mid level dry air advecting in from the west will limit potential. So while a rumble or two of thunder is possible...opted to keep out of the forecast for now. Later shifts may have to take another look.
Low temps Monday night will mainly be in the upper 40s to the middle 50s. There may be some patchy fog development too.
LONG TERM /TUESDAY THROUGH SUNDAY/
* Dry and Mild on Tuesday
* Persistent period of cool temps and heightened rain chances Wednesday through early next week.
Tuesday continues to be the pick of the week, and while heights begin to fall as more zonal flow develops aloft, west/northwest downsloping boundary layer flow will support well above normal temps with 850mb temps between 7 and 9C and 925mb temps around 13C. Weak pressure gradient will lead to a seabreeze along the immediate coastline, so while temperatures soar into the mid and upper 70s across the interior, coastal localities will likely see peak temps in the late morning before temps drop back into the upper 50s/low 60s by late afternoon.
Synoptic shift towards a more zonal pattern on Wednesday and Thursday with a few shortwaves enhancing shower chances across southern New England. Robust trough develops over the eastern CONUS by Friday, allowing very unsettled pattern to persist through much of the weekend as low pressure remains nearly stationary over southern Ontario. Fortunately, the weak shortwaves wont bring tremendous rain chances to the region, with 7 Day QPF ensemble probabilities of 1" ranging between 40, SE MA, and 80, NW MA, percent through next Monday. While still a week out, the persistence of the pattern into late next weekend is a bit uncertain, with some global guidance, like the CMC and GFS, shifting the trough offshore late Saturday/early Sunday, which could yield improving conditions for the second half of the weekend.
Aside from scattered rain chances later this week, temperatures will be stuck below to well below normal thanks to aforementioned stalled front and very persistent onshore flow. Temps will be stuck in the 50s most days across the eastern half of the CWA Frontal boundary placement will make temperature forecasting a bit tricky for CT and western MA, where there are few opportunities late week for temps to climb into the 60s in that region.
AVIATION /20Z SUNDAY THROUGH FRIDAY/
Forecast Confidence Levels:
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update...
This afternoon through tonight...High Confidence.
Mainly lower end MVFR/IFR conditions will tend more towards IFR cigs/vsbys tonight with even localized LIFR conditions with the cooling boundary layer. Showers were currently working into interior MA & CT at mid afternoon and will overspread the coastal plain by late afternoon/early evening. Generally expect a 3 to 6 hour period of showers working from northwest to southeast into tonight. Light SE winds will tend to shift more to a S direction tonight. A period of LLWS will also impact areas to near the south coast toward daybreak with a modest SW low level jet.
Monday and Monday night...High Confidence.
MVFR-IFR conditions Monday morning will tend to improve to mainly VFR thresholds by mid afternoon and persist Mon night outside localized patchy ground fog
However
MVFR-IFR conditions in low clouds and fog may persist near the south coast well into Monday night with moist light SW low level flow ahead of a slow moving cold front. Bulk of the showers will exit the Cape/Islands Monday morning. Dry weather should then dominate later Monday into Monday night...but a round of scattered brief showers will work southward along a slow moving cold front Monday afternoon and evening but they will not last long in a give location. Light SW winds Monday will shift to a light NW wind Monday night behind a weak cold front.
KBOS TAF...High Confidence in TAF.
KBDL TAF...High Confidence in TAF.
Outlook /Tuesday through Friday/...
Tuesday: VFR. Slight chance SHRA.
Tuesday Night: Mainly VFR, with local MVFR possible. Chance SHRA.
Wednesday: Mainly MVFR, with areas IFR possible. Breezy. SHRA likely, isolated TSRA.
Wednesday Night: Mainly VFR, with local IFR possible. Breezy.
Chance SHRA.
Thursday: Mainly VFR, with areas MVFR possible. Breezy. Chance SHRA, isolated TSRA.
Thursday Night: MVFR/IFR conditions possible. Breezy. SHRA likely, isolated TSRA.
Friday: MVFR/IFR conditions possible. Breezy. Chance SHRA.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Tonight through Monday night...High Confidence.
A mid level warm front will cross the region tonight this will be followed by the passage of a weak cold front Monday night.
However...the pressure gradient will remain relatively weak...keeping winds/seas below small craft advisory thresholds. We may have enough of a LLJ for some southerly wind gusts of around 20+ knots to develop very late tonight into Monday morning. Winds gradually shift to more of a W direction Monday afternoon and then NW Monday night...but well below small craft advisory thresholds.
The main issue for mariners will be areas of fog developing overnight and persisting at times through Monday evening...until the cold frontal passage brings drier air and scours out the remaining fog.
Outlook /Tuesday through Friday/...
Tuesday: Winds less than 25 kt. Slight chance of rain showers.
Tuesday Night: Winds less than 25 kt. Chance of rain showers.
Wednesday: Winds less than 25 kt. Chance of rain showers, isolated thunderstorms.
Wednesday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers.
Thursday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers, isolated thunderstorms.
Thursday Night: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers, isolated thunderstorms.
Friday: Winds less than 25 kt. Seas up to 5 ft. 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 336 PM EDT Sun May 5 2024
SYNOPSIS
A period of widespread showers impacts the region tonight with the focus for them this evening. Partial sunshine develops on Monday with much warmer temperatures. A brief band of scattered showers is expected Monday afternoon/evening...but the majority of the time will feature dry weather. Tuesday will be the pick of the week with abundant sunshine and above normal temperatures. Unsettled pattern develops for Wednesday and beyond with below normal temperatures. Some uncertainty revolves around the weekend forecast.
NEAR TERM /UNTIL 6 AM MONDAY MORNING/
335 PM Update...
* Period of widespread showers tonight with the focus this evening * Low temps between 45 and 50 with areas of fog developing
Approaching shortwave/mid level warm front was inducing a modest southwest low level jet this afternoon. This has allowed a band of widespread showers to overspread areas northwest of I-95. This band of showers will gradually sink southeast and impact the Boston to Providence corridor by late afternoon/early evening. Once the steady showers arrive they should generally last between 3 and 6 hours. The bulk of the showers will come to an end northwest of I-95 near or shortly after midnight...but linger towards the Cape and Islands.
Overnight low temps should only drop a few degrees from their current readings...mainly in the 45 to 50 degree range. We do expect some fog to develop overnight given increasing low level moisture with light southerly flow.
SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/
Key Points...
* Partial sunshine developing away from south coast Monday * Turning much warmer with highs well into the 70s for most on Monday * Scattered brief showers Mon PM, but most of the time it will be dry
Details...
Monday and Monday night...
Any lingering showers towards the Cape/Islands should come to an end Monday morning as the shortwave departs. Subsidence and enough westerly flow aloft should allow for partial sunshine to develop.
Temperatures will quickly respond give 850T near +10C. It will be much warmer than today with highs well up into the 70s. May even feel a tad humid given dewpoints in the upper 50s to near 60...so quite the change. It will be cooler near the south coast, Cape and Islands where low clouds and fog patches may linger.
The vast majority of Monday will feature dry weather
However
a cold front dropping south will probably result in a band of brief scattered showers dropping south Monday afternoon and evening. There probably will be a few hundred J/KG of Cape developing...but mid level dry air advecting in from the west will limit potential. So while a rumble or two of thunder is possible...opted to keep out of the forecast for now. Later shifts may have to take another look.
Low temps Monday night will mainly be in the upper 40s to the middle 50s. There may be some patchy fog development too.
LONG TERM /TUESDAY THROUGH SUNDAY/
* Dry and Mild on Tuesday
* Persistent period of cool temps and heightened rain chances Wednesday through early next week.
Tuesday continues to be the pick of the week, and while heights begin to fall as more zonal flow develops aloft, west/northwest downsloping boundary layer flow will support well above normal temps with 850mb temps between 7 and 9C and 925mb temps around 13C. Weak pressure gradient will lead to a seabreeze along the immediate coastline, so while temperatures soar into the mid and upper 70s across the interior, coastal localities will likely see peak temps in the late morning before temps drop back into the upper 50s/low 60s by late afternoon.
Synoptic shift towards a more zonal pattern on Wednesday and Thursday with a few shortwaves enhancing shower chances across southern New England. Robust trough develops over the eastern CONUS by Friday, allowing very unsettled pattern to persist through much of the weekend as low pressure remains nearly stationary over southern Ontario. Fortunately, the weak shortwaves wont bring tremendous rain chances to the region, with 7 Day QPF ensemble probabilities of 1" ranging between 40, SE MA, and 80, NW MA, percent through next Monday. While still a week out, the persistence of the pattern into late next weekend is a bit uncertain, with some global guidance, like the CMC and GFS, shifting the trough offshore late Saturday/early Sunday, which could yield improving conditions for the second half of the weekend.
Aside from scattered rain chances later this week, temperatures will be stuck below to well below normal thanks to aforementioned stalled front and very persistent onshore flow. Temps will be stuck in the 50s most days across the eastern half of the CWA Frontal boundary placement will make temperature forecasting a bit tricky for CT and western MA, where there are few opportunities late week for temps to climb into the 60s in that region.
AVIATION /20Z SUNDAY THROUGH FRIDAY/
Forecast Confidence Levels:
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update...
This afternoon through tonight...High Confidence.
Mainly lower end MVFR/IFR conditions will tend more towards IFR cigs/vsbys tonight with even localized LIFR conditions with the cooling boundary layer. Showers were currently working into interior MA & CT at mid afternoon and will overspread the coastal plain by late afternoon/early evening. Generally expect a 3 to 6 hour period of showers working from northwest to southeast into tonight. Light SE winds will tend to shift more to a S direction tonight. A period of LLWS will also impact areas to near the south coast toward daybreak with a modest SW low level jet.
Monday and Monday night...High Confidence.
MVFR-IFR conditions Monday morning will tend to improve to mainly VFR thresholds by mid afternoon and persist Mon night outside localized patchy ground fog
However
MVFR-IFR conditions in low clouds and fog may persist near the south coast well into Monday night with moist light SW low level flow ahead of a slow moving cold front. Bulk of the showers will exit the Cape/Islands Monday morning. Dry weather should then dominate later Monday into Monday night...but a round of scattered brief showers will work southward along a slow moving cold front Monday afternoon and evening but they will not last long in a give location. Light SW winds Monday will shift to a light NW wind Monday night behind a weak cold front.
KBOS TAF...High Confidence in TAF.
KBDL TAF...High Confidence in TAF.
Outlook /Tuesday through Friday/...
Tuesday: VFR. Slight chance SHRA.
Tuesday Night: Mainly VFR, with local MVFR possible. Chance SHRA.
Wednesday: Mainly MVFR, with areas IFR possible. Breezy. SHRA likely, isolated TSRA.
Wednesday Night: Mainly VFR, with local IFR possible. Breezy.
Chance SHRA.
Thursday: Mainly VFR, with areas MVFR possible. Breezy. Chance SHRA, isolated TSRA.
Thursday Night: MVFR/IFR conditions possible. Breezy. SHRA likely, isolated TSRA.
Friday: MVFR/IFR conditions possible. Breezy. Chance SHRA.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Tonight through Monday night...High Confidence.
A mid level warm front will cross the region tonight this will be followed by the passage of a weak cold front Monday night.
However...the pressure gradient will remain relatively weak...keeping winds/seas below small craft advisory thresholds. We may have enough of a LLJ for some southerly wind gusts of around 20+ knots to develop very late tonight into Monday morning. Winds gradually shift to more of a W direction Monday afternoon and then NW Monday night...but well below small craft advisory thresholds.
The main issue for mariners will be areas of fog developing overnight and persisting at times through Monday evening...until the cold frontal passage brings drier air and scours out the remaining fog.
Outlook /Tuesday through Friday/...
Tuesday: Winds less than 25 kt. Slight chance of rain showers.
Tuesday Night: Winds less than 25 kt. Chance of rain showers.
Wednesday: Winds less than 25 kt. Chance of rain showers, isolated thunderstorms.
Wednesday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers.
Thursday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers, isolated thunderstorms.
Thursday Night: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers, isolated thunderstorms.
Friday: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
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 |
| KGHG MARSHFIELD MUNI GEORGE HARLOW FIELD,MA | 10 sm | 19 min | var 06 | 10 sm | Overcast | 50°F | 46°F | 87% | 30.22 | |
| KPYM PLYMOUTH MUNI,MA | 12 sm | 22 min | S 07G15 | 10 sm | Overcast | 50°F | 45°F | 82% | 30.22 | |
| KPVC PROVINCETOWN MUNI,MA | 18 sm | 18 min | S 11G15 | 10 sm | Overcast | 48°F | 46°F | 93% | 30.25 | |
| KFMH CAPE COD COAST GUARD AIR STATION,MA | 24 sm | 29 min | S 12 | 10 sm | Overcast | 48°F | 45°F | 87% | 30.26 |
Gurnet Point
Click for Map
Sun -- 03:22 AM EDT -0.10 feet Low Tide
Sun -- 04:08 AM EDT Moonrise
Sun -- 05:32 AM EDT Sunrise
Sun -- 09:29 AM EDT 9.99 feet High Tide
Sun -- 03:45 PM EDT -0.31 feet Low Tide
Sun -- 05:00 PM EDT Moonset
Sun -- 07:46 PM EDT Sunset
Sun -- 09:56 PM EDT 10.63 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 03:22 AM EDT -0.10 feet Low Tide
Sun -- 04:08 AM EDT Moonrise
Sun -- 05:32 AM EDT Sunrise
Sun -- 09:29 AM EDT 9.99 feet High Tide
Sun -- 03:45 PM EDT -0.31 feet Low Tide
Sun -- 05:00 PM EDT Moonset
Sun -- 07:46 PM EDT Sunset
Sun -- 09:56 PM EDT 10.63 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Gurnet Point, Massachusetts, Tide feet
| 12 am |
| 5.9 |
| 1 am |
| 3.5 |
| 2 am |
| 1.3 |
| 3 am |
| 0 |
| 4 am |
| 0.2 |
| 5 am |
| 1.7 |
| 6 am |
| 3.8 |
| 7 am |
| 6.3 |
| 8 am |
| 8.5 |
| 9 am |
| 9.8 |
| 10 am |
| 9.8 |
| 11 am |
| 8.7 |
| 12 pm |
| 6.7 |
| 1 pm |
| 4.4 |
| 2 pm |
| 2 |
| 3 pm |
| 0.2 |
| 4 pm |
| -0.3 |
| 5 pm |
| 0.8 |
| 6 pm |
| 2.9 |
| 7 pm |
| 5.5 |
| 8 pm |
| 8.1 |
| 9 pm |
| 10 |
| 10 pm |
| 10.6 |
| 11 pm |
| 9.9 |
Cape Cod Canal
Click for Map
Sun -- 01:28 AM EDT 0.19 knots Slack
Sun -- 04:08 AM EDT Moonrise
Sun -- 04:31 AM EDT 4.20 knots Max Flood
Sun -- 05:33 AM EDT Sunrise
Sun -- 07:45 AM EDT -0.14 knots Slack
Sun -- 10:42 AM EDT -4.62 knots Max Ebb
Sun -- 01:52 PM EDT 0.19 knots Slack
Sun -- 05:00 PM EDT Moonset
Sun -- 05:01 PM EDT 4.49 knots Max Flood
Sun -- 07:45 PM EDT Sunset
Sun -- 08:21 PM EDT -0.21 knots Slack
Sun -- 11:13 PM EDT -4.65 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 01:28 AM EDT 0.19 knots Slack
Sun -- 04:08 AM EDT Moonrise
Sun -- 04:31 AM EDT 4.20 knots Max Flood
Sun -- 05:33 AM EDT Sunrise
Sun -- 07:45 AM EDT -0.14 knots Slack
Sun -- 10:42 AM EDT -4.62 knots Max Ebb
Sun -- 01:52 PM EDT 0.19 knots Slack
Sun -- 05:00 PM EDT Moonset
Sun -- 05:01 PM EDT 4.49 knots Max Flood
Sun -- 07:45 PM EDT Sunset
Sun -- 08:21 PM EDT -0.21 knots Slack
Sun -- 11:13 PM EDT -4.65 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Cape Cod Canal, Massachusetts Current, knots
| 12 am |
| -3.5 |
| 1 am |
| -2.1 |
| 2 am |
| 2.2 |
| 3 am |
| 3.6 |
| 4 am |
| 4.1 |
| 5 am |
| 4.1 |
| 6 am |
| 3.7 |
| 7 am |
| 2.6 |
| 8 am |
| -1.6 |
| 9 am |
| -3.6 |
| 10 am |
| -4.4 |
| 11 am |
| -4.6 |
| 12 pm |
| -4.1 |
| 1 pm |
| -2.9 |
| 2 pm |
| 1.2 |
| 3 pm |
| 3.3 |
| 4 pm |
| 4.2 |
| 5 pm |
| 4.5 |
| 6 pm |
| 4.3 |
| 7 pm |
| 3.6 |
| 8 pm |
| 1.9 |
| 9 pm |
| -2.7 |
| 10 pm |
| -4.1 |
| 11 pm |
| -4.6 |
Boston, MA,
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