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Marine Weather and Tides
Version 3.4 |
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it. 8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue. 12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed. 10/9/2019 Updated the Marine Zones. 9/4/2019 Fixed the weather maps due to NOAA moving them. 7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. |
Sunrise 7:02AM | Sunset 4:39PM | Sunday January 17, 2021 3:59 AM EST (08:59 UTC) | Moonrise 10:59AM | Moonset 10:27PM | Illumination 16% | ![]() |
ANZ231 Cape Cod Bay- 116 Am Est Sun Jan 17 2021
.gale warning in effect through this evening...
Rest of tonight..W winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft.
Sun..W winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 6 ft.
Sun night..W winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft.
Mon..W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Mon night through Tue night..W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Wed and Wed night..NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft.
Thu and Thu night..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of snow 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.
.gale warning in effect through this evening...
Rest of tonight..W winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft.
Sun..W winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 6 ft.
Sun night..W winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft.
Mon..W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Mon night through Tue night..W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Wed and Wed night..NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft.
Thu and Thu night..W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of snow 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.
ANZ200 116 Am Est Sun Jan 17 2021
Synopsis for massachusetts and rhode island coastal waters.. A strong area of low pressure departs from southern new england overnight Saturday. A cold front will cross the waters Sunday morning. High pressure builds across the waters for Monday into Tuesday. Another areas of low pressure moves over the waters Wednesday into Thursday. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo.
Synopsis for massachusetts and rhode island coastal waters.. A strong area of low pressure departs from southern new england overnight Saturday. A cold front will cross the waters Sunday morning. High pressure builds across the waters for Monday into Tuesday. Another areas of low pressure moves over the waters Wednesday into Thursday. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo.
7 Day Forecast for Marine Location Near Province, MA
Hourly EDIT Help
location: 41.99, -70.06 debug
Area Discussion for - Boston, MA
  (on/off)  Help NOTE: mouseover dotted underlined text for definitionFXUS61 KBOX 170842 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 342 AM EST Sun Jan 17 2021
SYNOPSIS. Strong low pressure over Maine will continue to strengthen as it lifts into Quebec today, bringing dry & but windy weather. Above normal temperatures today and Monday, will be replaced by seasonably cool temperatures beginning Tuesday and continuing through the workweek. Several opportunities for light snow showers in the week ahead, especially across the higher elevation of the interior. Snow showers may be a bit more widespread Thursday into Friday.
NEAR TERM /UNTIL 6 PM THIS EVENING/.
4 AM Update .
Today .
Strong, vertically stacked cyclone over Maine this morning slowly exits northeast into the Maritimes. The main sensible weather impacts here in Southern New England, will be strong and gusty west winds, as low drops below 980 mb today. Model soundings indicate a deep boundary layer extending up to 800 mb courtesy of cold air advection. Gust potential up to 40 kt/45 mph or so across Northern MA including Boston. Will be close to wind advisory criteria, but given it's marginal will hold off for now. Elsewhere west winds 15 to 25 mph with gusts up to 40 mph. Confluent flow aloft across Southern New England will promote dry weather. The exception will be over northwest-northern MA, where upslope flow combined with some lake effect moisture is resulting in persistent snow showers over the Berkshires and spilling into northern Worcester county. Expect this to continue much of the day.
Post frontal airmass not very cold so expecting highs to remain above normal. Model soundings suggest mixing up to 800-850 mb, this combined downsloping west winds, sided with the warmer guid to derive today's high temps. Highs in the low to mid 40s will be common, with upper 40s possible in the coastal plain of Eastern MA and RI, upper 30s for high terrain. Normal high is 31-37, thus another day running above normal.
More clouds in the high terrain, more Sunshine in the coastal plain of MA/RI.
SHORT TERM /6 PM THIS EVENING THROUGH 6 PM MONDAY/.
400 AM update .
Tonight .
Weak short wave moves across the region. Not much deep layer moisture associated with this feature, thus other than a passing snow shower/flurry, mainly dry weather should prevail. Gusty west winds slowly slacken as deep cyclone moves farther away from the region. Another night of temps above normal, with lows in the upper 20s and lower 30s.
Monday .
Another short wave trough traverses the area. Moisture is once again limited, but may be sufficient for a few scattered snow showers/flurries well inland, few scattered rain showers/sprinkles elsewhere. Otherwise a dry day. One more day of above normal temps with highs in the 40s, upper 30s high terrain. Once again leaned toward the warmer guidance given well mixed boundary layer and downsloping winds.
LONG TERM /MONDAY NIGHT THROUGH SATURDAY/.
Highlights .
* Mostly dry with periods of light snow showers early Wednesday and Thursday night/Friday
* Seasonably cool temperatures generally in the 30s and 40s
Details .
A largely quiet and dry week and weekend is expected with a few disturbances that will bring the chance for light snow showers; first early Wednesday then a bit more substantial late Thursday and Thursday night. At the synoptic scale the broad mid level trough remains situated over the eastern half of the U.S. with periodic shortwaves rotating through the base of the trough. Considering the source region and shallow nature of these waves, each fails to tap into a significant source of deep layer moisture, so only light snow/rain showers are expected.
Tuesday heights will be rising as a mid level bridge builds in drying things out and allowing for more breaks of sun. Even so, it will feel quite a bit colder than Monday under cold NW flow. CAA promotes mixing up to near 850 mb where temps are around -8C, allowing for highs in the mid to upper 30s. Winds continue to be breezy under a lingering low level jet at well. The first in the series of shortwaves then approaches Tuesday night bringing increasing cloudcover, but only widely scattered light snow showers. The frontal passage Wednesday does bring colder temperatures, though, so highs will be closer to the low to mid 30s; 20s in the highest elevations.
Drying out with clearing skies then Wednesday night and early Thursday as a weak ridge builds overhead. This allows for good radiational cooling and the coldest night of the week. Forecast lows have thus favored the MOS guidance, down into the teens and even single digits in NW Massachusetts. The only thing that would hinder us reaching those coldest temps will be if the pressure gradient remeains too strong to allow the boudary layer to decouple; something to watch.
A bit of a better chance at some light accumulating snow (coating to an inch) late Thursday into Friday thanks to some more favorable dynamics including a stronger sfc low and secondary low that forms off the coast, and a 150 kt jet at 300 mb. By the weekend the trend is drier with building high pressure.
AVIATION /09Z SUNDAY THROUGH THURSDAY/. Forecaster Confidence Levels.
Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.
06z update .
Through 12Z . High confidence
VFR with marginal MVFR across western MA in scattered snow showers. Otherwise, dry weather prevails but W winds steadily increase courtesy of strengthening low pressure over Maine. Gusts increasing towards 30 kt by sunrise, strongest winds high terrain and Cape Cod/Islands.
After 12z . High confidence
VFR, except marginal MVFR northwest MA with possible scattered snow showers. Otherwise dry weather prevails but gusty W winds up to 35-40 kt possible at times.
Sunday Night . High confidence
VFR and WSW winds slowly diminish. Low risk of leftover MVFR conditions in northwest MA from scattered snow showers early, but then improving.
Monday . High confidence.
VFR and mainly dry weather other than a brief snow shower. Western MA likely MVFR in scattered snow showers. Modest west winds 15-20 kt, gusts up to 25 kt possible Cape Cod and the Islands.
KBOS TAF . High confidence in TAF.
KBDL TAF . High confidence in TAF.
Outlook /Monday Night through Thursday/ .
Monday Night through Wednesday Night: VFR. Breezy.
Thursday: VFR. Breezy. Slight chance SHSN.
MARINE.
Today/Tonight/Monday . High Confidence.
Westerly gales into this evening. Then winds diminishing later this evening as sub 980 mb low over the Maritimes slowly exits. As for freezing spray, airmass not cold enough to support any issues. Modest west winds continue tonight into Monday. Mainly dry weather with good vsby.
Outlook /Monday Night through Thursday/ .
Monday Night: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas.
Tuesday: Winds less than 25 kt. Local rough seas.
Tuesday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas.
Wednesday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Slight chance of snow showers.
Wednesday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Chance of freezing spray.
Thursday: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of snow showers.
BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Gale Warning until 10 PM EST this evening for ANZ231>235-237- 250-251-254>256. Gale Warning from 8 AM this morning to 6 PM EST this evening for ANZ230-236.
SYNOPSIS . Nocera/BW NEAR TERM . Nocera SHORT TERM . Nocera LONG TERM . BW AVIATION . Nocera/BW MARINE . Nocera/BW
Weather Reporting Stations
EDIT (on/off)  Help NOTE: Click on distance to see the station location on a mapStations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
44018 - SE Cape Cod 30NM East of Nantucket, MA | 16 mi | 39 min | WSW 27 G 35 | 39°F | 45°F | 990.6 hPa | 31°F | |
44090 | 18 mi | 62 min | 41°F | 3 ft | ||||
CHTM3 | 22 mi | 59 min | W 8.9 G 18 | 38°F | 43°F | 993.6 hPa (+2.7) | ||
44020 - NANTUCKET SOUND | 36 mi | 39 min | WSW 23 G 27 | 41°F | ||||
WAXM3 - Waquoit Bay Reserve, MA | 37 mi | 194 min | WSW 4.1 | 39°F | 992 hPa | 33°F | ||
44013 - BOSTON 16 NM East of Boston, MA | 40 mi | 39 min | WSW 25 G 33 | 39°F | 43°F | 991.9 hPa | 30°F | |
44029 - Buoy A0102 - Mass. Bay/Stellwagen | 46 mi | 115 min | WSW 23 G 31 | 40°F | 9 ft | 988.7 hPa | ||
BZBM3 - 8447930 - Woods Hole, MA | 46 mi | 59 min | 38°F | 40°F | 995.2 hPa (+2.7) | |||
NTKM3 - 8449130 - Nantucket Island, MA | 49 mi | 59 min | W 14 G 23 | 40°F | 41°F | 995.4 hPa (+2.9) |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off)  Help4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | |
Last 24hr | E G26 | E G24 | E G23 | E G23 | SE G24 | SE G25 | SE G18 | S | SE G13 | SW G18 | SW G14 | SW G17 | SW G14 | SW G11 | SW | SW G12 | SW G11 | SW G10 | W G12 | W G16 | W G11 | W G17 | W G18 | W G23 |
1 day ago | N G7 | NE G9 | NE | NE G9 | N G9 | N | NE | NE G10 | NE G11 | NE | E G13 | NE G9 | E | E | E | E | SE | E | E | E G12 | E G17 | E G22 | E G24 | E G23 |
2 days ago | SW | S | S G6 | S G6 | SE | SE G7 | S G8 | S | SE | S G7 | SE | SE | N | -- | -- | -- | N | N G7 | NE | NE | N G10 | N G9 | N |
Airport Reports
EDIT (on/off)  Help Click EDIT to display multiple airports. Follow links for more data.Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
Chatham, Chatham Municipal Airport, MA | 20 mi | 67 min | WSW 12 G 22 | 10.00 mi | Fair | 37°F | 27°F | 67% | 994.3 hPa |
Hyannis, Barnstable Municipal-Boardman Airport, MA | 24 mi | 63 min | WSW 17 G 22 | 10.00 mi | Fair | 37°F | 28°F | 70% | 993.5 hPa |
Link to 5 minute data for KPVC
Wind History from PVC (wind in knots)
11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | |
Last 24hr | E | NE | NE | E | NE | E | E | E | E | Calm | SE | E | E | SE | SE | SE G23 | SE G17 | E G17 | E G25 | E G20 | E G28 | E G31 | E G28 | SE G23 |
1 day ago | W | NW | Calm | Calm | E | E | NE | NE | NE | NE | NE | NE | NE | N | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE |
2 days ago | NW | W | W | S | S | S | SW | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | S | S | Calm | NW |
Tide / Current Tables for Cape Cod Lighthouse, SE of, Cape Cod, Massachusetts
EDIT Weekend mode (on/off) (on/off)  Help One Week of DataCape Cod Lighthouse
Click for Map
Sun -- 02:11 AM EST 7.58 feet High Tide
Sun -- 07:04 AM EST Sunrise
Sun -- 08:07 AM EST 0.50 feet Low Tide
Sun -- 09:58 AM EST Moonrise
Sun -- 02:21 PM EST 8.08 feet High Tide
Sun -- 04:36 PM EST Sunset
Sun -- 08:38 PM EST 0.01 feet Low Tide
Sun -- 09:27 PM EST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 02:11 AM EST 7.58 feet High Tide
Sun -- 07:04 AM EST Sunrise
Sun -- 08:07 AM EST 0.50 feet Low Tide
Sun -- 09:58 AM EST Moonrise
Sun -- 02:21 PM EST 8.08 feet High Tide
Sun -- 04:36 PM EST Sunset
Sun -- 08:38 PM EST 0.01 feet Low Tide
Sun -- 09:27 PM EST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
5.3 | 6.9 | 7.6 | 7.3 | 6.2 | 4.7 | 2.9 | 1.3 | 0.5 | 0.9 | 2.1 | 3.8 | 5.6 | 7.2 | 8 | 7.9 | 6.9 | 5.3 | 3.4 | 1.6 | 0.3 | 0.1 | 0.9 | 2.3 |
Tide / Current Tables for Provincetown, Massachusetts (2)
EDIT (on/off)  Help One Week of DataProvincetown
Click for Map
Sun -- 02:15 AM EST 9.00 feet High Tide
Sun -- 07:05 AM EST Sunrise
Sun -- 08:14 AM EST 0.59 feet Low Tide
Sun -- 09:59 AM EST Moonrise
Sun -- 02:25 PM EST 9.60 feet High Tide
Sun -- 04:36 PM EST Sunset
Sun -- 08:45 PM EST 0.01 feet Low Tide
Sun -- 09:28 PM EST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 02:15 AM EST 9.00 feet High Tide
Sun -- 07:05 AM EST Sunrise
Sun -- 08:14 AM EST 0.59 feet Low Tide
Sun -- 09:59 AM EST Moonrise
Sun -- 02:25 PM EST 9.60 feet High Tide
Sun -- 04:36 PM EST Sunset
Sun -- 08:45 PM EST 0.01 feet Low Tide
Sun -- 09:28 PM EST Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
12 am | 1 am | 2 am | 3 am | 4 am | 5 am | 6 am | 7 am | 8 am | 9 am | 10 am | 11 am | 12 pm | 1 pm | 2 pm | 3 pm | 4 pm | 5 pm | 6 pm | 7 pm | 8 pm | 9 pm | 10 pm | 11 pm |
6.1 | 8.1 | 9 | 8.7 | 7.5 | 5.7 | 3.6 | 1.7 | 0.6 | 1 | 2.4 | 4.3 | 6.4 | 8.4 | 9.5 | 9.4 | 8.3 | 6.5 | 4.3 | 2.1 | 0.4 | 0 | 0.9 | 2.5 |
Weather Map
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GEOS Local Image of EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific Contential US Full GOES-East
Ground Weather Radar Station
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