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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 6:31AM | Sunset 6:33PM | Monday September 25, 2017 2:51 PM EDT (18:51 UTC) | Moonrise 11:44AM | Moonset 9:58PM | Illumination 26% |  |
Marine Forecasts
EDIT (on/off) Help| ANZ232 Nantucket Sound- 116 Pm Edt Mon Sep 25 2017 This afternoon..E winds around 5 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 nm or less. Tonight..SE winds around 5 kt. Seas 2 to 3 ft. Areas of fog. Vsby 1 nm or less. Tue..E winds around 5 kt, becoming se around 5 kt in the afternoon. Seas 2 to 4 ft. Areas of fog. Vsby 1 nm or less. Tue night..SE winds around 5 kt. Seas 2 to 4 ft. Patchy fog. Vsby 1 to 3 nm. Wed..SE winds 5 to 10 kt. Seas 2 to 4 ft. Patchy fog. Vsby 1 to 3 nm. Wed night..S winds around 5 kt. Seas 2 to 4 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm. Thu..NW winds 5 to 10 kt. Seas 2 to 4 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm. Thu night..N winds 10 to 15 kt with gusts up to 30 kt. Seas 3 to 5 ft. A chance of showers. Fri..N winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Fri night..N winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. 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 Pm Edt Mon Sep 25 2017 Synopsis for massachusetts and rhode island coastal waters.. High pressure over the eastern usa will bring light wind and fair weather to the waters through Tuesday. Southerly swell from hurricane maria will continue to move north into the waters and linger for much of the week. A cold front from canada will cross the waters later Wednesday or early Thursday. Mariners should Monitor the latest forecasts from the national hurricane center at www.nhc.noaa.gov. 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 251839 afdbox area forecast discussion national weather service taunton ma 239 pm edt Mon sep 25 2017 Synopsis High pressure covering the northeast u.S. Will bring fair, warm weather to southern new england through Wednesday. A cold front combined with moisture from maria may impact the region with possibly scattered showers Wednesday into Thursday. Behind the front, turning much cooler and lower humidity later Thursday and continuing into the weekend. Hurricane maria will bring dangerous rough surf and rip currents to the south coast this week, before passing well southeast of new england late this week. Near term until 7 pm this evening 150 pm update... noting the low clouds and patchy fog are confined to nantucket and portions of nantucket sound on latest goes-16 non-op prelim satellite imagery and 17z observations. However, noting some clouds pushing n-nw into ri and bi sounds and near the mouth of buzzards bay and S end of vineyard sound, but tending to thin as they shift into the S coasts of ri and mass. Elsewhere, noting diurnal clouds developing across interior areas, mainly across central W mass into N ct. With light e-ne winds, skies remain mainly clear across eastern mass and most of ri. Not seeing any shower activity developing across the region as of 1750z, but do see some spotty showers across northern nh and the mountains of me as well as northern cheshire county nh. Will continue to monitor for possible spot showers, but at this point expect to be very limited and short lived. Temps as of 17z were mainly in the mid-upper 80s across the ct and merrimack valleys, up to 90 degrees at kowd, with readings in the upper 70s to lower 80s along the immediate coast with local sea breezes. With the light or calm winds in place, could see temps go up another few degrees but, with the clouds inland it may hold them down a bit. Will continue to monitor. Short term 7 pm this evening through 6 pm Tuesday High pressure means light wind will continue. This means fair weather with patchy fog inland. Meanwhile, the coastal fog and stratus should again advect up across CAPE cod and islands. There is a low risk that the fog could advance farther northwest into southeast mass. High pressure remains in control Tuesday, with a light wind inland and light southeast wind at the shore. The NAM and ggem show showers moving into south coastal ma and ri tonight. The ggem then spreads showers across all of southern new england Tuesday. Dynamic features show no support for this, and convective parameters are stable through the period. We will favor the GFS and ECMWF which keep any showers offshore, and will show slight chance pops along the south coast late in the day. With dew points in the 60s, min temps should also be in the 60s. Sunshine and mixing on Tuesday will again bring the layer up to about 850 mb, where temps are forecast at 16c-17c. This favors mid 80s inland and cooler toward the shore. Long term Tuesday night through Sunday Highlights... * very warm and humid weather persist into Wednesday * scattered showers possible Wednesday into Thursday * pattern change to much cooler and less humid weather late thu into the weekend overall good model agreement on the large scale flow between the ec, gfs, their ensembles, the UKMET and nam. Thus above average forecast confidence this period. Ridge lingers across the region into Wed and will result in warm (highs 80-85) and humid conditions (dew pts 65-70!). Despite hurricane maria remaining well south of new england mid level moisture advects (k indices on the rise) northward into our area beginning Wed and continuing into thu. Not much forcing for ascent Wed given ridge axis lingers across the area. Thus perhaps dry weather prevails wed. However by Wed night and especially into Thu approaching short wave and attending cold front will act on pwats of +2 std from maria and provide a focus for showers late Wed into thu. Some signs this could take the form of a pre - predecessor rainfall event given frontal boundary and upper level jet streak. Thus looks like a small window of opportunity for a period of heavy rain over southeast ma Thu especially CAPE cod and the islands. Will have to watch closely given tropical airmass. Then big improvement with a noticeable cool down late Thu into the weekend as low level flow becomes n-ne behind departing fropa and maria. Seasonable for this time of year with highs 65-70 Fri Sat Sun and lows in the 40s along with low humidity. A touch of fall for sure. Mainly dry too with the exception of a few isolated brief diurnal showers possible Sat with cold pool aloft and cyclonic flow. Aviation 18z Monday through Saturday Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Tuesday night ... through 00z... High confidence. Vfr and mainly dry weather today, other than a spot shower over the high terrain this afternoon. Light sea breezes develop along immediate E coast, and calm or light variable winds elsewhere. Patchy ifr-lifr CIGS continue off and on from kcqx- kack with mainlyVFR vsbys. May see MVFR-ifr vsbys return to kack around 23z or 00z in fog. |
Tonight... Moderate confidence. MainlyVFR inland with patchy fog after 04z-05z. Expect low stratus clouds and areas of fog with ifr-lifr conditions to return to CAPE cod and the islands from 02z-04z. The low cigs and fog may push n-nw into ri SE mass, and possibly as far N as kbos, though lower confidence reaching there. Light variable or calm winds. Tuesday... Moderate to high confidence. MainlyVFR. Areas of ifr-lifr early across CAPE cod and the islands due to fog, with some improvement to MVFR by around midday. Light s-se winds. Tuesday night... Moderate confidence. Vfr to start, then MVFR-ifr conditions moving in again. Lifr conditions possible across CAPE cod and the islands. Kbos taf... High confidence in taf. Light sea breeze shifts to light S from 00z-02z. Light s-se wind during tue. Kbdl taf... High confidence in taf. Outlook Wednesday through Friday ... High confidence. Wed... Marginal MVFR-vfr with very low risk of rain. Thu... Marginal MVFR-vfr southeast ma along with risk of showers. Elsewhere improving toVFR and mainly dry. Fri...VFR, dry weather and light winds. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Tuesday ... High confidence. Light e-ne winds will continue through Tuesday with high pressure nearby. Meanwhile, increasing long period south swell from hurricane maria will be moving into the waters with potential for 5 to 7 foot seas over southern waters tonight and 7 to 9 feet on Tuesday. SCA for hazardous seas will continue. In addition, areas of fog will result in poor vsbys at times, especially south and east of CAPE cod and into nantucket and vineyard sounds. Outlook Tuesday night through Friday ... High confidence. Tue night and wed... Light winds with ridge overhead however increasing large southerly swells from hurricane maria. Low risk of scattered showers especially southern waters. Given moist airmass rounds of fog expected. Wed night into thu... Some heavy rain possible southeast ma waters as moisture from maria combine with approaching cold front. In addition areas of dense fog may be an issue. Friday... Big improvement with front offshore and high pres building in. Tides coastal flooding Long period swell from hurricane maria will be moving north into the south coastal waters. Wnawave guidance indicating increasing swell of 5-7 feet with a period of 15 seconds moving reaching the south coastal waters tonight and up to 9 ft on Tuesday. This will result in increasing high surf and dangerous rip currents. High surf advisory will continue and will extend through tue. It is likely the high surf will continue through the week even as maria likely recurves out to sea well southeast of new england. Climate So far, the high temp has reached 91 degrees at kbdl, setting the record high for today's date. Record report has been sent, but will be updated once final high has been reached. Max readings so far are 84 degrees at both korh and kpvd, only a degree off of tying the record at korh. Will continue to monitor for possible record tying or setting readings through the remainder of the afternoon. Records jump up Tuesday to 89-95, while less mixing will lead to lower MAX temps. So the chance for record highs diminishes Tuesday. The current record MAX temps for the two days... Today and Tuesday... Are: bos 89 1926 95 1881 orh 85 1970 91 1930 bdl 90 2007 93 2007 pvd 89 1920 89 2007 also, dew points in the 60s, while high for this time of year, are not unprecedented. The daily extreme high values for dew points are still in the low 70s, except for a couple of 68 and 69 values at worcester. Box watches warnings advisories Ct... None. Ma... High surf advisory until 6 pm edt Tuesday for maz020-022>024. Ri... High surf advisory until 6 pm edt Tuesday for riz006>008. Marine... Small craft advisory for hazardous seas until 6 pm edt Tuesday for anz235-237. Small craft advisory for hazardous seas until 7 am edt Wednesday for anz254>256. Synopsis... Wtb nocera near term... Evt short term... Wtb long term... Nocera aviation... Nocera evt marine... Wtb nocera evt tides coastal flooding... Staff climate... Staff |
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 | 4.1 | 75°F | 1019 hPa | 69°F | ||
| BZBM3 - 8447930 - Woods Hole, MA | 10 mi | 52 min | 70°F | 67°F | 1018.3 hPa (-0.5) | |||
| 44020 - NANTUCKET SOUND | 17 mi | 62 min | NE 5.8 G 5.8 | 62°F | 62°F | 1 ft | 1018.6 hPa (+0.0) | 62°F |
| 44090 | 22 mi | 48 min | 66°F | |||||
| NTKM3 - 8449130 - Nantucket Island, MA | 27 mi | 52 min | NE 4.1 G 6 | 67°F | 66°F | 1018.5 hPa (+0.0) | ||
| BUZM3 - Buzzards Bay, MA | 31 mi | 52 min | NW 4.1 G 4.1 | 66°F | 1018.6 hPa (-0.4) | |||
| FRXM3 | 38 mi | 52 min | 77°F | 67°F | ||||
| FRVM3 - 8447386 - Fall River, MA | 38 mi | 52 min | 78°F | 68°F | 1018.6 hPa (-0.4) | |||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 38 mi | 52 min | SW 11 G 12 | 71°F | 1017.1 hPa (-0.5) | |||
| PRUR1 | 44 mi | 52 min | 70°F | 66°F | ||||
| NWPR1 - 8452660 - Newport, RI | 45 mi | 52 min | SW 5.1 G 7 | 68°F | 66°F | 1018.2 hPa (+0.0) | ||
| NAXR1 - Narragansett Bay Reserve, RI | 46 mi | 67 min | SW 5.1 | 77°F | 68°F | |||
| PTCR1 - 8452951 - Potter Cove, Prudence Island, RI | 46 mi | 52 min | WSW 4.1 G 9.9 | 74°F | 1018.1 hPa (-0.3) | |||
| CPTR1 - 8452944 - Conimicut Light, RI | 47 mi | 52 min | S 12 G 12 | 71°F | 69°F | 1017.8 hPa (-0.5) | ||
| QPTR1 - 8454049 - Quonset Point, RI | 49 mi | 52 min | S 13 G 14 | 67°F | 68°F | 1018.2 hPa (-0.4) |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off) Help| 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 | 11 AM | 12 PM | 1 PM | 2 PM | |
| Last 24hr | NE G7 | N | N | NE | NE | N | NE | NE | SE | SE | S | NW | NW | N | NE | NE | NE | NE | E | NE | NE G7 | NE | NE | NE |
| 1 day ago | N G16 | N G20 | N G14 | N G13 | N G13 | N G12 | N G10 | N | N G8 | N G6 | N G8 | N | N G12 | NE | N G8 | N | N G9 | N G7 | NE | NE G9 | N | N | NE | NE |
| 2 days ago | NE G24 | NE G26 | NE G24 | NE G27 | NE G27 | NE G24 | NE G26 | NE G26 | NE G26 | NE G22 | NE G20 | NE G20 | N G20 | NE G19 | N G19 | NE G18 | NE G20 | NE G18 | NE G13 | NE G14 | N G17 | N G15 | N G15 | N G17 |
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 | E 7 | 10.00 mi | Fair | 81°F | 69°F | 70% | 1018.6 hPa |
| Marthas Vineyard Airport, MA | 12 mi | 59 min | NE 7 | 10.00 mi | Mostly Cloudy | 75°F | 68°F | 79% | 1018.2 hPa |
| Hyannis, Barnstable Municipal-Boardman Airport, MA | 14 mi | 56 min | E 5 | 10.00 mi | A Few Clouds | 77°F | 70°F | 79% | 1018.2 hPa |
Wind History from FMH (wind in knots)
| 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 | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | |
| Last 24hr | S | S | SE | SE | Calm | Calm | Calm | Calm | Calm | NW | Calm | SW | Calm | Calm | Calm | SE | Calm | Calm | Calm | E | SE | SE | SE | SE |
| 1 day ago | N G13 | N | N G15 | N | NE | NE | NE | N | NE | Calm | N | Calm | Calm | N | N | Calm | NE | N | NE | NE | E | NE | ||
| 2 days ago | N G29 | NE G25 | N G20 | N G24 | N G22 | N G27 | N G26 | NE G25 | NE G21 | NE G24 | NE G21 | N G21 | N G21 | N G22 | N | N G19 | N | NE G23 | N G19 | N G19 | N G17 | N G17 | N | N G18 |
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 Mon -- 04:11 AM EDT 1.89 feet High Tide Mon -- 06:32 AM EDT Sunrise Mon -- 09:58 AM EDT 0.20 feet Low Tide Mon -- 11:43 AM EDT Moonrise Mon -- 04:26 PM EDT 1.97 feet High Tide Mon -- 06:33 PM EDT Sunset Mon -- 09:57 PM EDT Moonset Mon -- 10:30 PM EDT 0.14 feet Low 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 |
| 0.6 | 1 | 1.4 | 1.7 | 1.9 | 1.8 | 1.5 | 1.2 | 0.7 | 0.4 | 0.2 | 0.3 | 0.6 | 1 | 1.4 | 1.7 | 1.9 | 1.9 | 1.7 | 1.3 | 0.9 | 0.5 | 0.2 | 0.2 |
Tide / Current Tables for Cape Cod Canal, Massachusetts Current
EDIT (on/off) Help One Week of Data| Cape Cod Canal Click for Map Mon -- 01:33 AM EDT -0.19 knots Slack Mon -- 04:22 AM EDT -4.29 knots Max Ebb Mon -- 06:33 AM EDT Sunrise Mon -- 07:27 AM EDT 0.18 knots Slack Mon -- 10:23 AM EDT 3.96 knots Max Flood Mon -- 11:44 AM EDT Moonrise Mon -- 01:48 PM EDT -0.18 knots Slack Mon -- 04:43 PM EDT -4.26 knots Max Ebb Mon -- 06:34 PM EDT Sunset Mon -- 07:47 PM EDT 0.19 knots Slack Mon -- 09:58 PM EDT Moonset Mon -- 10:47 PM EDT 3.98 knots Max Flood 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 |
| 3.4 | 2.2 | -2 | -3.6 | -4.2 | -4.2 | -3.4 | -2 | 2.1 | 3.4 | 3.9 | 3.9 | 3.4 | 2.4 | -1.3 | -3.2 | -4.1 | -4.2 | -3.7 | -2.6 | 1.3 | 3.1 | 3.8 | 4 |
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 (14,3,4,5)
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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. |