Marine Weather and Tide Forecast for Siasconset, MA
April 18, 2024 6:49 PM EDT (22:49 UTC) Change Location
 | Sunrise 5:53 AM Sunset 7:26 PM Moonrise 2:20 PM Moonset 3:51 AM |
ANZ272 Expires:202308151215;;938845 Fzus71 Kbox 151120 Mwsbox
marine weather statement national weather service boston/norton ma 720 am edt Tue aug 15 2023
anz254-255-271-272-151215- 720 am edt Tue aug 15 2023
.a strong Thunderstorm approaching the waters - .
the areas affected include - . Coastal waters extending out to 25 nm south of marthas vineyard and nantucket - . Coastal waters from provincetown ma to chatham ma to nantucket ma out 20 nm - . Ocean waters from marthas vineyard to nantucket from 25 to 45 nm offshore - . Ocean waters from provincetown to nantucket from 20 to 35 nm offshore - .
at 719 am edt, doppler radar indicated a strong Thunderstorm, capable of producing winds to around 30 knots. This Thunderstorm was located 20 nm south of the coastal waters south of nantucket, moving northeast at 30 knots.
the strong Thunderstorm will remain over mainly open waters.
precautionary/preparedness actions - .
expect gusty winds to around 30 knots - .briefly rough seas and lightning strikes. Consider heading for safe harbor until this storm passes.
frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible and keep away from ungrounded metal objects.
&&
lat - .lon 4120 6914 4102 6921 4073 6947 4064 6961 4059 6979 4103 7018 4153 6921 4147 6915
marine weather statement national weather service boston/norton ma 720 am edt Tue aug 15 2023
anz254-255-271-272-151215- 720 am edt Tue aug 15 2023
the areas affected include - . Coastal waters extending out to 25 nm south of marthas vineyard and nantucket - . Coastal waters from provincetown ma to chatham ma to nantucket ma out 20 nm - . Ocean waters from marthas vineyard to nantucket from 25 to 45 nm offshore - . Ocean waters from provincetown to nantucket from 20 to 35 nm offshore - .
at 719 am edt, doppler radar indicated a strong Thunderstorm, capable of producing winds to around 30 knots. This Thunderstorm was located 20 nm south of the coastal waters south of nantucket, moving northeast at 30 knots.
the strong Thunderstorm will remain over mainly open waters.
precautionary/preparedness actions - .
expect gusty winds to around 30 knots - .briefly rough seas and lightning strikes. Consider heading for safe harbor until this storm passes.
frequent lightning is occurring with this storm. If caught on the open water stay below deck if possible and keep away from ungrounded metal objects.
&&
lat - .lon 4120 6914 4102 6921 4073 6947 4064 6961 4059 6979 4103 7018 4153 6921 4147 6915
ANZ200 401 Pm Edt Thu Apr 18 2024
Synopsis for massachusetts and rhode island coastal waters - Ridge of high pressure builds across the region tonight and Friday. A cold front moves through late Friday and early Saturday. High pressure ridge will develop Saturday to our south and remain there into early next week.
Area Discussion for - Boston, MA
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FXUS61 KBOX 181951 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 351 PM EDT Thu Apr 18 2024
SYNOPSIS
Cool with a few showers into the evening. A more seasonable day on Friday, along with dry conditions during the daytime hours.
A cold front brings another round of showers overnight into early Saturday morning. Dry for the rest of Saturday and all day Sunday with breezy conditions both days. The dry stretch of weather continues as we head into early next week, with the next chance for unsettled weather being Wednesday.
NEAR TERM /UNTIL 6 AM FRIDAY MORNING/
345 pm update...
Highlights:
* Raw afternoon with areas of light rain, turning drier overnight, but can not rule out a spot shower across eastern Massachusetts and Rhode Island.
Southern New England stuck under a blanket of thick clouds while just to the north, people of Maine are enjoying lots of sunshine. A shortwave passing through continues to produce areas of light rain.
Most of the day has been largely dry, thanks to drier air to the northeast. This light rain continues to move east this afternoon, ending early this evening. Overall a cool and raw rest of the afternoon for southern New England with temperatures in the 40s.
Overnight, southern New England is between surface high pressure to the north over Nova Scotia and low pressure to the south over the outer waters. This set up will allows for on shore flow tonight. A few showers are possible, though do think much of tonight remains dry. A mid-level shortwave drops down out of northern New England and will help in producing scattered light rain mainly over the eastern half of the CWA Though, with this afternoon, the high pressure to the north does provide a fair amount of dry air and that will limit the coverage. This is a slight change from the previous forecast, did add slight chance POPs for the overnight period for parts of eastern Massachusetts and Rhode Island.
East/northeast winds, strongest at the south coast with gusts to 20 MPH, while further north winds are fairly light and at times variable in direction.
Night time lows are seasonable, upper 30s across the interior and low 40s by the coast.
SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/
345 pm update...
Highlights:
* Slight improvement for Friday with drier weather for the daylight hours and near seasonable temperatures.
* Unsettled overnight with another chance for light rain, especially along the south coast near daybreak on Saturday.
Some improvement weatherwise on Friday with surface high pressure expanding into southern New England, along with mid-level ridging. A warmer, more seasonable day with highs in the upper 50s and low 60s are on tap. Where temperatures may struggle are along the immediate coast as the winds are still coming off of the water. Areas of low clouds to start gives way to breaks of sunshine late morning into early afternoon, short-lived as mid and high clouds move in from west to east ahead of a cold front. Winds are more or less out of the southeast due to the flow from the surface high based in eastern Quebec and surface low well off to the south near Bermuda. The pressure gradient eases allowing for gusts less than 20 MPH at the coast.
Increasing clouds from west to east during the second-half of the day ahead of an approaching front. A prefrontal trough could set off a few showers across western Massachusetts and northern Connecticut late afternoon, but do think the bulk of any perception will come with the frontal passage overnight, then kick off shore shortly after sunrise on Saturday. That said, do not anticipate a soaking rain, much of southern New England receives a few hundredths of an inch, and the immediate south coast, Cape, and Island receive around a quarter to a third of an inch.
Wind shifts overnight from southeast to southwest, no strong gusts are expected. Overnight lows dip into the middle 40s.
LONG TERM /SATURDAY THROUGH THURSDAY/
345 pm update...
Key Point: * Fire weather concerns this weekend through Tuesday
Fairly high consistency amongst the 12z global guidance runs as well with prior runs. So that results in overall higher than average confidence. In general, most of us will consider the weather for most of the period to be pretty nice. A weak front will be moving offshore during the first part of Saturday, only bringing a few light showers. Behind the front, a much drier airmass will be spreading in. So that will result in clearing skies. Have again blended in the warmer side of guidance for temperatures and lower side of guidance for dewpoints. Forecast soundings still show excellent mixing (5000-6000ft) developing in the afternoon along with westerly winds. Being still a "pre- greenup" phase of vegetation, that usually means temperatures overachieve and humidity levels go lower than most guidance thanks to the combo of downsloping and deep boundary layer mixing. We should see widespread mid 60s for highs, perhaps making a run at 70F in the CT River Valley.
Sunday will be similar, though with 850mb temperatures slightly cooler (down around -1C vs +1C on Saturday), daytime highs will be a few degrees cooler, primarily either side of 60F. Again deep boundary layer mixing (6000-7000ft) will act to bring down some of the 25kt winds aloft along with dry air. Thus winds will be gustier than on Saturday and lower dewpoints. The combo will mean we will be flirting with some of the fire weather thresholds (RH <30%, Frequent gusts >25mph, less than 1/4" of rain in 3 days).
Monday, high pressure will move overhead and maintain the dry weather. Still a dry airmass and deep mixing, but winds will be weaker, so will still need to monitor fire weather aspects, but don't think it's as significant a concern. Tuesday will still be dry, but with high pressure moving off the east coast, winds will start to turn southerly.
Guidance showing another weak front coming through Wednesday, so stuck with NBM PoPs. Rainfall amounts again will be light. Dry weather should return for Thursday.
AVIATION /19Z THURSDAY THROUGH TUESDAY/
Forecast Confidence Levels:
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High- greater than 60 percent.
Today...High confidence.
VFR, pockets of MVFR along and west of the CT River. A few light rain showers this afternoon, temporarily reducing visibilities between 3SM and 5SM. East/northeast winds 5 to 15 knots, and gusting up to 25 knots for the south coast, Cape, and islands.
Tonight and Friday...High confidence.
VFR, pesky mid-level clouds around 050-070 ft. Low chance for an isolated rain shower across eastern MA and RI between 03z and 09z, otherwise dry. Northeast winds are 5 to 15 knots.
Friday...High confidence.
VFR and dry. Southeast wind 10 to 15 knots.
KBOS TAF...High confidence in TAF.
Low prob of a spot shower late this afternoon, generally after 21Z. Per collab with ZBW have added a TEMPO group for this risk.
KBDL TAF...High confidence in TAF.
Marginal MVFR ceilings this morning with rain showers as we head into the afternoon. Should see ceilings lift to VFR roughly 18-21Z and remain for the rest of the TAF.
Outlook /Saturday through Tuesday/...
Saturday: VFR. Breezy. Slight chance SHRA.
Saturday Night through Sunday Night: VFR. Breezy.
Monday through Monday Night: VFR.
Tuesday: VFR. Breezy.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
345pm update...
Tonight and Friday...High confidence.
Pressure gradient weakens as the wave of low pressure continues to move further southeast and away from the region. Seas will also diminish, but some 5 foot seas to linger across our southern outer- waters, extending small craft headlines in those locations through Friday late afternoon. Winds on Friday remain out of the east and less than 20 knots.
Friday Night...High confidence.
Wind direction from southeast to southwest with the passage of a frontal boundary, along with rain chances. Areas of fog is possible with reduced visibilities. Seas remain below 4 foot.
Outlook /Saturday through Tuesday/...
Saturday: Winds less than 25 kt. Chance of rain showers. Local visibility 1 to 3 nm.
Saturday Night: Winds less than 25 kt. Seas locally approaching 5 ft.
Sunday through Tuesday: Winds less than 25 kt.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 5 PM EDT this afternoon for ANZ232>235-237.
Small Craft Advisory until 7 PM EDT Friday for ANZ255-256.
Area Forecast Discussion National Weather Service Boston/Norton MA 351 PM EDT Thu Apr 18 2024
SYNOPSIS
Cool with a few showers into the evening. A more seasonable day on Friday, along with dry conditions during the daytime hours.
A cold front brings another round of showers overnight into early Saturday morning. Dry for the rest of Saturday and all day Sunday with breezy conditions both days. The dry stretch of weather continues as we head into early next week, with the next chance for unsettled weather being Wednesday.
NEAR TERM /UNTIL 6 AM FRIDAY MORNING/
345 pm update...
Highlights:
* Raw afternoon with areas of light rain, turning drier overnight, but can not rule out a spot shower across eastern Massachusetts and Rhode Island.
Southern New England stuck under a blanket of thick clouds while just to the north, people of Maine are enjoying lots of sunshine. A shortwave passing through continues to produce areas of light rain.
Most of the day has been largely dry, thanks to drier air to the northeast. This light rain continues to move east this afternoon, ending early this evening. Overall a cool and raw rest of the afternoon for southern New England with temperatures in the 40s.
Overnight, southern New England is between surface high pressure to the north over Nova Scotia and low pressure to the south over the outer waters. This set up will allows for on shore flow tonight. A few showers are possible, though do think much of tonight remains dry. A mid-level shortwave drops down out of northern New England and will help in producing scattered light rain mainly over the eastern half of the CWA Though, with this afternoon, the high pressure to the north does provide a fair amount of dry air and that will limit the coverage. This is a slight change from the previous forecast, did add slight chance POPs for the overnight period for parts of eastern Massachusetts and Rhode Island.
East/northeast winds, strongest at the south coast with gusts to 20 MPH, while further north winds are fairly light and at times variable in direction.
Night time lows are seasonable, upper 30s across the interior and low 40s by the coast.
SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/
345 pm update...
Highlights:
* Slight improvement for Friday with drier weather for the daylight hours and near seasonable temperatures.
* Unsettled overnight with another chance for light rain, especially along the south coast near daybreak on Saturday.
Some improvement weatherwise on Friday with surface high pressure expanding into southern New England, along with mid-level ridging. A warmer, more seasonable day with highs in the upper 50s and low 60s are on tap. Where temperatures may struggle are along the immediate coast as the winds are still coming off of the water. Areas of low clouds to start gives way to breaks of sunshine late morning into early afternoon, short-lived as mid and high clouds move in from west to east ahead of a cold front. Winds are more or less out of the southeast due to the flow from the surface high based in eastern Quebec and surface low well off to the south near Bermuda. The pressure gradient eases allowing for gusts less than 20 MPH at the coast.
Increasing clouds from west to east during the second-half of the day ahead of an approaching front. A prefrontal trough could set off a few showers across western Massachusetts and northern Connecticut late afternoon, but do think the bulk of any perception will come with the frontal passage overnight, then kick off shore shortly after sunrise on Saturday. That said, do not anticipate a soaking rain, much of southern New England receives a few hundredths of an inch, and the immediate south coast, Cape, and Island receive around a quarter to a third of an inch.
Wind shifts overnight from southeast to southwest, no strong gusts are expected. Overnight lows dip into the middle 40s.
LONG TERM /SATURDAY THROUGH THURSDAY/
345 pm update...
Key Point: * Fire weather concerns this weekend through Tuesday
Fairly high consistency amongst the 12z global guidance runs as well with prior runs. So that results in overall higher than average confidence. In general, most of us will consider the weather for most of the period to be pretty nice. A weak front will be moving offshore during the first part of Saturday, only bringing a few light showers. Behind the front, a much drier airmass will be spreading in. So that will result in clearing skies. Have again blended in the warmer side of guidance for temperatures and lower side of guidance for dewpoints. Forecast soundings still show excellent mixing (5000-6000ft) developing in the afternoon along with westerly winds. Being still a "pre- greenup" phase of vegetation, that usually means temperatures overachieve and humidity levels go lower than most guidance thanks to the combo of downsloping and deep boundary layer mixing. We should see widespread mid 60s for highs, perhaps making a run at 70F in the CT River Valley.
Sunday will be similar, though with 850mb temperatures slightly cooler (down around -1C vs +1C on Saturday), daytime highs will be a few degrees cooler, primarily either side of 60F. Again deep boundary layer mixing (6000-7000ft) will act to bring down some of the 25kt winds aloft along with dry air. Thus winds will be gustier than on Saturday and lower dewpoints. The combo will mean we will be flirting with some of the fire weather thresholds (RH <30%, Frequent gusts >25mph, less than 1/4" of rain in 3 days).
Monday, high pressure will move overhead and maintain the dry weather. Still a dry airmass and deep mixing, but winds will be weaker, so will still need to monitor fire weather aspects, but don't think it's as significant a concern. Tuesday will still be dry, but with high pressure moving off the east coast, winds will start to turn southerly.
Guidance showing another weak front coming through Wednesday, so stuck with NBM PoPs. Rainfall amounts again will be light. Dry weather should return for Thursday.
AVIATION /19Z THURSDAY THROUGH TUESDAY/
Forecast Confidence Levels:
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High- greater than 60 percent.
Today...High confidence.
VFR, pockets of MVFR along and west of the CT River. A few light rain showers this afternoon, temporarily reducing visibilities between 3SM and 5SM. East/northeast winds 5 to 15 knots, and gusting up to 25 knots for the south coast, Cape, and islands.
Tonight and Friday...High confidence.
VFR, pesky mid-level clouds around 050-070 ft. Low chance for an isolated rain shower across eastern MA and RI between 03z and 09z, otherwise dry. Northeast winds are 5 to 15 knots.
Friday...High confidence.
VFR and dry. Southeast wind 10 to 15 knots.
KBOS TAF...High confidence in TAF.
Low prob of a spot shower late this afternoon, generally after 21Z. Per collab with ZBW have added a TEMPO group for this risk.
KBDL TAF...High confidence in TAF.
Marginal MVFR ceilings this morning with rain showers as we head into the afternoon. Should see ceilings lift to VFR roughly 18-21Z and remain for the rest of the TAF.
Outlook /Saturday through Tuesday/...
Saturday: VFR. Breezy. Slight chance SHRA.
Saturday Night through Sunday Night: VFR. Breezy.
Monday through Monday Night: VFR.
Tuesday: VFR. Breezy.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
345pm update...
Tonight and Friday...High confidence.
Pressure gradient weakens as the wave of low pressure continues to move further southeast and away from the region. Seas will also diminish, but some 5 foot seas to linger across our southern outer- waters, extending small craft headlines in those locations through Friday late afternoon. Winds on Friday remain out of the east and less than 20 knots.
Friday Night...High confidence.
Wind direction from southeast to southwest with the passage of a frontal boundary, along with rain chances. Areas of fog is possible with reduced visibilities. Seas remain below 4 foot.
Outlook /Saturday through Tuesday/...
Saturday: Winds less than 25 kt. Chance of rain showers. Local visibility 1 to 3 nm.
Saturday Night: Winds less than 25 kt. Seas locally approaching 5 ft.
Sunday through Tuesday: Winds less than 25 kt.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 5 PM EDT this afternoon for ANZ232>235-237.
Small Craft Advisory until 7 PM EDT Friday for ANZ255-256.
| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | inHg | DewPt |
| NTKM3 - 8449130 - Nantucket Island, MA | 26 mi | 49 min | ENE 12G | 51°F | 30.14 | |||
| CHTM3 | 41 mi | 49 min | 52°F | |||||
| 44020 - NANTUCKET SOUND | 42 mi | 29 min | NE 14G | 46°F | 47°F | 3 ft | 30.14 | 43°F |
| 44008 - NANTUCKET 54NM Southeast of Nantucket | 49 mi | 39 min | ENE 21G | 44°F | 30.04 |
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 |
| KACK NANTUCKET MEMORIAL,MA | 23 sm | 56 min | NE 12G20 | 10 sm | Overcast | 45°F | 39°F | 81% | 30.12 |
Tide / Current for Davis Bank, Nantucket Shoals, Massachusetts
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Davis Bank
Click for Map
Thu -- 01:28 AM EDT 0.30 feet Low Tide
Thu -- 03:51 AM EDT Moonset
Thu -- 05:53 AM EDT Sunrise
Thu -- 08:18 AM EDT 1.25 feet High Tide
Thu -- 02:11 PM EDT 0.20 feet Low Tide
Thu -- 02:20 PM EDT Moonrise
Thu -- 07:22 PM EDT Sunset
Thu -- 09:00 PM EDT 1.19 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Thu -- 01:28 AM EDT 0.30 feet Low Tide
Thu -- 03:51 AM EDT Moonset
Thu -- 05:53 AM EDT Sunrise
Thu -- 08:18 AM EDT 1.25 feet High Tide
Thu -- 02:11 PM EDT 0.20 feet Low Tide
Thu -- 02:20 PM EDT Moonrise
Thu -- 07:22 PM EDT Sunset
Thu -- 09:00 PM EDT 1.19 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Davis Bank, Nantucket Shoals, Massachusetts, Tide feet
| 12 am |
| 0.5 |
| 1 am |
| 0.3 |
| 2 am |
| 0.3 |
| 3 am |
| 0.4 |
| 4 am |
| 0.5 |
| 5 am |
| 0.7 |
| 6 am |
| 1 |
| 7 am |
| 1.2 |
| 8 am |
| 1.2 |
| 9 am |
| 1.2 |
| 10 am |
| 1.1 |
| 11 am |
| 0.9 |
| 12 pm |
| 0.6 |
| 1 pm |
| 0.3 |
| 2 pm |
| 0.2 |
| 3 pm |
| 0.2 |
| 4 pm |
| 0.3 |
| 5 pm |
| 0.5 |
| 6 pm |
| 0.8 |
| 7 pm |
| 1 |
| 8 pm |
| 1.1 |
| 9 pm |
| 1.2 |
| 10 pm |
| 1.1 |
| 11 pm |
| 1 |
Siasconset
Click for Map
Thu -- 02:14 AM EDT 0.28 feet Low Tide
Thu -- 03:53 AM EDT Moonset
Thu -- 05:55 AM EDT Sunrise
Thu -- 08:29 AM EDT 1.16 feet High Tide
Thu -- 02:21 PM EDT Moonrise
Thu -- 02:57 PM EDT 0.18 feet Low Tide
Thu -- 07:23 PM EDT Sunset
Thu -- 09:11 PM EDT 1.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Thu -- 02:14 AM EDT 0.28 feet Low Tide
Thu -- 03:53 AM EDT Moonset
Thu -- 05:55 AM EDT Sunrise
Thu -- 08:29 AM EDT 1.16 feet High Tide
Thu -- 02:21 PM EDT Moonrise
Thu -- 02:57 PM EDT 0.18 feet Low Tide
Thu -- 07:23 PM EDT Sunset
Thu -- 09:11 PM EDT 1.10 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Siasconset, Nantucket Island, Massachusetts, Tide feet
| 12 am |
| 0.6 |
| 1 am |
| 0.4 |
| 2 am |
| 0.3 |
| 3 am |
| 0.3 |
| 4 am |
| 0.4 |
| 5 am |
| 0.6 |
| 6 am |
| 0.8 |
| 7 am |
| 1 |
| 8 am |
| 1.1 |
| 9 am |
| 1.1 |
| 10 am |
| 1.1 |
| 11 am |
| 0.9 |
| 12 pm |
| 0.7 |
| 1 pm |
| 0.4 |
| 2 pm |
| 0.2 |
| 3 pm |
| 0.2 |
| 4 pm |
| 0.2 |
| 5 pm |
| 0.4 |
| 6 pm |
| 0.6 |
| 7 pm |
| 0.8 |
| 8 pm |
| 1 |
| 9 pm |
| 1.1 |
| 10 pm |
| 1.1 |
| 11 pm |
| 1 |
Boston, MA,
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