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Marine Weather and Tides
Version 3.4 |
6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive. 5/19/2016 - There were issues with the 3 day airport observation history. I switched to another data source. Let me know if you see any issues with the data feeds. |
| Sunrise 5:24AM | Sunset 8:10PM | Friday July 21, 2017 6:52 PM EDT (22:52 UTC) | Moonrise 3:32AM | Moonset 6:32PM | Illumination 3% |  |
Marine Forecasts
EDIT (on/off) Help| ANZ232 Nantucket Sound- 332 Pm Edt Fri Jul 21 2017 Tonight..W winds 5 to 10 kt. Gusts up to 20 kt this evening. Seas around 2 ft. Sat..NW winds around 5 kt, becoming S in the afternoon. Seas 1 foot or less. Sat night..S winds around 5 kt, becoming se 10 to 15 kt after midnight. Seas 1 foot or less. A chance of showers. Sun..NE winds 10 to 15 kt with gusts up to 20 kt, becoming E 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Sun night..E winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 nm. Mon..E winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. A chance of showers. Mon night..N winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Tue..NE winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft. Tue night..N winds 5 to 10 kt. Seas 2 to 3 ft. Wed..NE winds 5 to 10 kt. Seas around 2 ft. Wed night..S winds 5 to 10 kt. Seas 1 foot or less. 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 332 Pm Edt Fri Jul 21 2017 Synopsis for massachusetts and rhode island coastal waters.. High pressure will move overhead tonight and on Saturday. Approaching warm front on Sunday with a coastal low pressure system moving through the waters on Monday and Tuesday. High pressure builds over the waters from the west on Wednesday. Another cold front will cross the waters Thursday night and Friday morning. For information on possible hazardous weather beyond the 24-36 hour forecast period, please visit www.weather.gov/boston and follow the current hazards link above the map on the left. |
7 Day Forecast for Marine Location Near New Seabury, MA
Hourly EDIT Helplocation: 41.55, -70.48 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 211942 afdbox area forecast discussion national weather service taunton ma 342 pm edt Fri jul 21 2017 Synopsis Dry weather prevails mostly through Saturday with lower humidity, but it will be hot. High pressure from canada builds over the region Sunday, then moves off to the east. Low pressure from the great lakes approaches on Monday bringing showers and scattered thunderstorms. High pressure moves in during Tuesday and Wednesday with dry weather. Another area of low pressure moves through late in the week. Near term through tonight Quiet. Scattered cumulus dissipates however mid to high level clouds continue to filter across the region in association with remnant convection upstream. A weak, shallow trough boundary pushing S with more N flow and drier air in association with a mid level vortex slightly dropping S round a deeper low over the e hudson bay region of canada, forecasting dry air advection with lower dewpoints. All in consideration, if winds become light then there is some opportunity for spot locations to drop out. As we saw last night, sheltered valleys in N W ma were able to drop into the upper 50s. Similar thinking for tonight with average lows across the region around the mid 60s. Short term Saturday through Saturday night Saturday into Saturday night... keeping it mostly dry. In brevity, the quasi-stationary boundary is bowled further S of S new england with the latest forecast suite, acting as the focus of warm-moist S inflow beneath modest w winds and shear lending to the development of thunderstorm complexes. With drier air maintained in place by N flow, have lowered pops. Think any interior activity initiated along the slopes of high terrain with whatever moisture is available will be well N W across upstate ny vt nh. Expect increasing clouds with time subsequent of cloud tops from convection S with the chance for some rain overnight into Sunday morning across ct ri SE ma, greatest chances further s. The air- mass of +17c air around h85 unchanged lending to highs around the upper 80s to low 90s, some relief along the shores given sea- breezes as winds will be light during the day, begins to filter out towards Sunday as cooler air slides slightly S with increasing n NE winds per isallobaric response of a weak wave low along the quasi-stationary boundary. Lows once again around the mid 60s. Long term Sunday through Friday Big picture... the longwave large scale pattern across the northern usa remains as it has been... Ridge west and trough east. If there is a variation in this theme, it is that the ridge should shift east to the rockies high plains later next week and the eastern trough shifts east to the maritimes. Two shortwaves in the flow will affect new england in the next seven days. One starting over alberta canada will cross our area late Monday or Tuesday. The other coming from the gulf of alaska will come ashore this weekend and reach new england late in the week. Model mass fields showed notable differences in handling the shortwaves last night, but the 12z runs have come into better agreement, especially regarding the early-week shortwave. Confidence is moderate-high for the early-week shortwave and low-moderate for the late-week shortwave. Details... Sunday... fair weather as high pressure from hudsons bay builds over maine and the maritimes. This brings an east flow to our area which should keep surface temperatures cooler than normal. All models show a low pressure wave passing south of our area. The nam12 and GFS grids show no pops and no qpf, while the ECMWF shows lingering precip over ct-ri-se mass. Based on the position of the ridge, we favor the drier solution. Sunday night through Tuesday... the early-week shortwave moves a surface low from the great lakes toward new england with increasing lift ahead of the system. Expect clouds to fill in, with increasing chance of precip, especially after midnight. We have adjusted pops to show this trend. The shortwave moves across our area Tuesday morning, so we will expect showers through that time with the highest pops during Monday. Clouds, showers and the low level east flow should keep daytime temps no higher than the 70s. Wednesday... high pressure moves overhead, bringing dry weather and dew points in the 50s. Temps at 850 mb will be 8-10c, so expect MAX temps in the 70s. Thursday-Friday... the late-week shortwave moves across our area. Current model timing would bring the shortwave and surface cold front through during |
Thursday afternoon evening, but timing has varied a little from one model run to the next, so potential exists for the system to move through a little earlier or a little later. Once it does move through, it will be followed by an area of drier weather... Probably Friday. Aviation 19z Friday through Wednesday Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Saturday night ... High confidence. Into tonight... vfr. Sct-bkn mid-high cigs. Low risk MVFR-ifr for ack. Winds diminishing, becoming light out of the nw. Saturday into Saturday night... vfr. Sct mid-high CIGS initially, lowering towards low-endVFR overnight with a low risk of a shra. Light NW winds allowing for daytime sea-breezes. Increasing by evening with breezy N NE flow. Kbos terminal... Sea-breezes forecast around 16z Saturday. As the sea-breeze comes ashore, winds are likely to be a bit stronger around 6-10 kts. Kbdl terminal...VFR. Outlook Sunday through Wednesday ... Moderate confidence. Sunday... vfr with an east wind. Ceilings vsbys lower to MVFR Sunday night. Monday-Tuesday... MVFR ceilings vsbys with areas of ifr in fog and heavier downpours. Scattered thunderstorms Monday afternoon. A cold front moves through during Monday night with winds shifting out of the north. Drier air moves in during Tuesday with conditions improving toVFR. Wednesday... vfr. Areas of ifr in early morning fog. Winds become variable with sea breezes along the coasts. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Saturday night ... into tonight... winds diminishing, becoming light out of the nw. Seas below 4 feet. A risk of lower visibility with fog over the waters S E of the immediate nantucket shore. Saturday into Saturday night... light NW winds allowing for daytime sea-breezes, increasing into evening becoming breezy out of the N NE with gusts up to 20 kts as a weak wave low passes W to E well S of the S waters. As the low passes, there is a chance of showers across all S waters. Seas below 4 feet. Outlook Sunday through Wednesday ... Moderate confidence. Low pressure south of the waters Sunday moves out to sea. Broader area of low pressure from the great lakes brings showers and scattered thunder to the waters from Sunday night through early Tuesday. East winds lead the system, then turn from the north as the weather system moves out to sea Tuesday. Winds will remain less than 25 knots through the period. Seas will be less than 5 feet on most waters through the period. Seas may reach 5 feet on the southern outer waters, where a small craft advisory may be needed. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... None. Synopsis... Wtb sipprell near term... Sipprell short term... Sipprell long term... Wtb aviation... Wtb sipprell marine... Wtb sipprell |
Weather Reporting Stations
EDIT (on/off) Help NOTE: Click on distance to see the station location on a map| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | Pressure | DewPt |
| WAXM3 - Waquoit Bay Reserve, MA | 3 mi | 67 min | 2.9 | 80°F | 1010 hPa | 71°F | ||
| BZBM3 - 8447930 - Woods Hole, MA | 10 mi | 52 min | 79°F | 74°F | 1009.5 hPa (+0.0) | |||
| 44020 - NANTUCKET SOUND | 17 mi | 62 min | 73°F | 1 ft | 1009 hPa (-0.5) | |||
| 44090 | 22 mi | 48 min | 69°F | |||||
| NTKM3 - 8449130 - Nantucket Island, MA | 27 mi | 52 min | WSW 8.9 G 13 | 78°F | 76°F | 1009.9 hPa (+0.0) | ||
| BUZM3 - Buzzards Bay, MA | 31 mi | 52 min | SW 19 G 20 | 74°F | 1009.8 hPa (-0.4) | |||
| FRXM3 | 38 mi | 52 min | 85°F | 70°F | ||||
| FRVM3 - 8447386 - Fall River, MA | 38 mi | 52 min | 85°F | 74°F | 1009.8 hPa (+0.0) | |||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 38 mi | 52 min | W 12 G 15 | 85°F | 1008.2 hPa (+0.0) | |||
| PRUR1 | 44 mi | 52 min | 84°F | 71°F | ||||
| NWPR1 - 8452660 - Newport, RI | 45 mi | 52 min | SW 13 G 15 | 76°F | 71°F | 1009.4 hPa (+0.0) | ||
| NAXR1 - Narragansett Bay Reserve, RI | 46 mi | 67 min | W 5.1 | 87°F | 1009 hPa | 69°F | ||
| PTCR1 - 8452951 - Potter Cove, Prudence Island, RI | 46 mi | 52 min | W 2.9 G 5.1 | 84°F | 1009.1 hPa (-0.3) | |||
| CPTR1 - 8452944 - Conimicut Light, RI | 47 mi | 52 min | W 12 G 20 | 86°F | 72°F | 1009.2 hPa (+0.0) | ||
| QPTR1 - 8454049 - Quonset Point, RI | 49 mi | 52 min | SW 9.9 G 12 | 83°F | 75°F | 1009.7 hPa (+0.0) |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off) Help| 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 | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | |
| Last 24hr | SW G12 | SW G11 | SW G10 | SW G10 | SW G8 | SW G9 | W G6 | SW | W G8 | W G10 | W G8 | W G7 | W G9 | NW G11 | NW G11 | W G9 | NW G11 | NW G8 | SW G10 | W G9 | SW G10 | SW G13 | SW G16 | W G13 |
| 1 day ago | SW G14 | SW G11 | SW G11 | SW G12 | SW G9 | SW G15 | W G9 | SW G9 | SW G10 | SW | W G10 | W G8 | W G7 | W | NW | W | SW G10 | W G11 | W G12 | SW G12 | SW G11 | SW G13 | SW G11 | |
| 2 days ago | S G8 | SW | SW G8 | SW G8 | SW | SW | SW | SW G8 | SW G7 | SW G9 | SW G9 | SW G9 | SW G11 | SW G12 | SW G13 | SW G12 | SW G13 | SW G14 | SW G16 | SW G18 | SW G18 | SW G16 | SW G19 | SW G13 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Otis Air National Guard Base, MA | 8 mi | 57 min | WSW 16 | 10.00 mi | Fair | 81°F | 69°F | 70% | 1009.5 hPa |
| Marthas Vineyard Airport, MA | 12 mi | 59 min | WSW 7 G 15 | 10.00 mi | Fair | 80°F | 69°F | 69% | 1009.6 hPa |
| Hyannis, Barnstable Municipal-Boardman Airport, MA | 14 mi | 56 min | SW 8 | 10.00 mi | Fair | 82°F | 71°F | 69% | 1008.8 hPa |
Wind History from FMH (wind in knots)
| 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 | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | |
| Last 24hr | SW | SW G15 | SW | SW | W | W | SW | SW | W | W | NW | NW | NW | NW | NW | W | SW | W | SW | SW | SW G16 | SW | SW G20 | |
| 1 day ago | SW G21 | SW G17 | SW | W | W | SW | W | W | W | Calm | Calm | Calm | Calm | W | W | W | W | W | W | SW | SW G18 | SW G17 | SW G17 | SW G17 |
| 2 days ago | SW | SW G13 | SW | SW | SW | SW | SW | W | SW | SW G15 | W | SW | SW | SW G15 | SW G17 | SW | SW | SW | SW G18 | SW G19 | SW G19 | SW G21 | SW G22 | SW G26 |
Tide / Current Tables for Succonnesset Point, Nantucket Sound, Massachusetts
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Succonnesset Point Click for Map Fri -- 03:32 AM EDT Moonrise Fri -- 04:20 AM EDT -0.18 feet Low Tide Fri -- 05:26 AM EDT Sunrise Fri -- 10:46 AM EDT 2.00 feet High Tide Fri -- 04:34 PM EDT -0.04 feet Low Tide Fri -- 06:32 PM EDT Moonset Fri -- 08:09 PM EDT Sunset Fri -- 11:03 PM EDT 2.35 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 1.8 | 1.3 | 0.7 | 0.2 | -0.2 | -0.1 | 0.2 | 0.6 | 1.1 | 1.6 | 1.9 | 2 | 1.8 | 1.4 | 0.9 | 0.4 | 0 | -0 | 0.3 | 0.7 | 1.3 | 1.8 | 2.2 | 2.4 |
Tide / Current Tables for Cape Cod Canal, Massachusetts Current
EDIT (on/off) Help One Week of Data| Cape Cod Canal Click for Map Fri -- 01:50 AM EDT 0.20 knots Slack Fri -- 03:32 AM EDT Moonrise Fri -- 04:57 AM EDT 4.46 knots Max Flood Fri -- 05:26 AM EDT Sunrise Fri -- 08:23 AM EDT -0.21 knots Slack Fri -- 11:10 AM EDT -4.52 knots Max Ebb Fri -- 02:14 PM EDT 0.20 knots Slack Fri -- 05:17 PM EDT 4.37 knots Max Flood Fri -- 06:33 PM EDT Moonset Fri -- 08:10 PM EDT Sunset Fri -- 08:33 PM EDT -0.14 knots Slack Fri -- 11:34 PM EDT -4.89 knots Max Ebb Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| -4.1 | -2.9 | 1.3 | 3.4 | 4.2 | 4.5 | 4.2 | 3.5 | 2 | -2.6 | -4 | -4.5 | -4.3 | -3.4 | -1.6 | 2.7 | 3.9 | 4.3 | 4.2 | 3.7 | 2.4 | -2.2 | -4 | -4.8 |
Weather Map and Satellite Images
(on/off) HelpWeather Map | IR Satellite Image from GEOS GOES Local Image of Northeast EDIT  |
Wind Forecast for Boston, MA (18,4,5,8)
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Ground Weather Radar Station Boston, MA
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Disclaimer: The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program. |