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Marine Weather and Tides
Version 3.4 |
7/21/2018 Trying to make page Mobile Friendly |
| Sunrise 5:54AM | Sunset 7:34PM | Monday August 20, 2018 3:00 AM EDT (07:00 UTC) | Moonrise 3:44PM | Moonset 12:45AM | Illumination 64% |  |
ANZ231 Cape Cod Bay- 116 Am Edt Mon Aug 20 2018
Rest of tonight..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Patchy fog. A slight chance of showers with patchy drizzle. Vsby 1 to 3 nm.
Mon..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Mon night..NE winds 5 to 10 kt. Seas around 2 ft.
Tue..E winds 5 to 10 kt. Seas around 2 ft.
Tue night..SE winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Wed..S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Wed night..W winds 10 to 15 kt. Seas 2 to 3 ft.
Thu..NW winds 5 to 10 kt. Seas 2 to 3 ft.
Thu night..W winds around 5 kt. Seas 1 foot or less.
Fri..N winds around 5 kt. Seas 1 foot or less.
Fri night..SW winds around 5 kt. Seas 1 foot or less. Winds and seas higher in and near tstms. 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.
Rest of tonight..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Patchy fog. A slight chance of showers with patchy drizzle. Vsby 1 to 3 nm.
Mon..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
Mon night..NE winds 5 to 10 kt. Seas around 2 ft.
Tue..E winds 5 to 10 kt. Seas around 2 ft.
Tue night..SE winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Wed..S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers and tstms.
Wed night..W winds 10 to 15 kt. Seas 2 to 3 ft.
Thu..NW winds 5 to 10 kt. Seas 2 to 3 ft.
Thu night..W winds around 5 kt. Seas 1 foot or less.
Fri..N winds around 5 kt. Seas 1 foot or less.
Fri night..SW winds around 5 kt. Seas 1 foot or less. Winds and seas higher in and near tstms. 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 Edt Mon Aug 20 2018
Synopsis for massachusetts and rhode island coastal waters.. A front will remain stalled south of new england overnight. Weak waves of low pres will move along it, bringing scattered showers and patchy fog, especially across the southern waters along with gusty ne winds up to around 25 kt. High pres will build across the waters from the N through Tue, then retreating ne Tue night. Low pres with its associated fronts will approach the waters from the W on Wed, then head offshore Wed night. Dry high pres will build in from the W on Thu and Fri. 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.
Synopsis for massachusetts and rhode island coastal waters.. A front will remain stalled south of new england overnight. Weak waves of low pres will move along it, bringing scattered showers and patchy fog, especially across the southern waters along with gusty ne winds up to around 25 kt. High pres will build across the waters from the N through Tue, then retreating ne Tue night. Low pres with its associated fronts will approach the waters from the W on Wed, then head offshore Wed night. Dry high pres will build in from the W on Thu and Fri. 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 Yarmouth Port, MA
Hourly EDIT Helplocation: 41.71, -70.29 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 200310 afdbox area forecast discussion national weather service boston norton ma 1110 pm edt Sun aug 19 2018 Synopsis High pressure over the maritimes and a stalled front to the south will combine to bring a northeast flow to southern new england through Monday night. A cold front will bring showers and thunderstorms Tuesday night into Wednesday. High pressure will build over the region Thursday, bringing fair weather and comfortable humidity through the weekend. Near term until 6 am Monday morning 1030 pm update... patchy showers and drizzle was moving onshore across portions of e mass, especially from kpym southward as seen on latest observations. Noting bands of showers moving westward off mass bay, though mostly not reaching the ground from kghg northward where t TD from 5 to 8 degrees were in place from kbos through kbvy and kpsm at 02z. Will see scattered showers and patchy drizzle across eastern areas with the NE low level wind flow, along with patchy fog especially across S coastal ri and SE mass through the night. Elsewhere, conditions were dry with clear to partly cloudy skies. A few lower clouds may sneak into central areas, as well as develop across portions of the ct valley after 07z or so as temps bottom out in the upper 50s to around 60, close to the dewpoints. Have updated near term to bring conditions current and incorporated trends into the remainder of the overnight forecast. Previous discussion... widely scattered showers have developed near CAPE cod and islands this evening, which are too shallow to easily be detected by kbox radar. Most of the high-res guidance keeps this activity across SE ma tonight, although some models try to bring few showers into boston and providence which seems too aggressive. Otherwise clouds will spread inland across most of sne tonight. Short term 6 am Monday morning through Monday night High pressure remains in place over the maritimes with a resulting northeast low level flow over southern new england. Low level moisture will diminish through the day as the sun heats the air, so morning clouds should give way to more Sun in the afternoon. CAPE cod and southeast mass in general may have the toughest road to sun. Another shortwave moves overhead and may generate a light shower or sprinkle mainly along the cape and islands. Sea temps around the coast are in the upper 60s and 70s, which will influence values along the coast, with temps in the lower 70s. Inland temps will be more subject to mixing, with mixing to 900 mb suggested by the forecast data. Temps at that level are equiv to 9-10c at 850 mb... So MAX sfc temp potential would be in the mid to upper 70s. If we were to mix up to 850 mb directly, slightly warmer temperatures would support MAX sfc temps around 80f. Similar air mass Monday night, with dew points a degree or two lower. Expect min sfc temps roughly 55-65. Long term Tuesday through Sunday Highlights... * strong severe storms possible Tuesday night and Wednesday. * fair weather Thursday into the weekend with comfortable humidity. Overview... large scale pattern features upper trough over northeast through end of week before we see re-emergence of upper ridge which begins to establish itself closer to sne by end of weekend. Aside from brief return of tropical humidity Tuesday night and Wednesday ahead of cold front, this setup favors near average temperatures but more importantly brings our first stretch of more comfortable humidity (dewpoints in 50s and 60s) later this week and into weekend. It does appear that heat and humidity may very well return beyond Sunday as upper ridge becomes more dominant. Details... main concern deals with potential for strong or even severe storms Tuesday night and Wednesday. Localized wind damage flash flooding are main threats but an isolated short-lived tornado is also possible. Low CAPE high shear environment in place ahead of cold front should be favorable for strong or even severe thunderstorms late Tuesday night (after midnight) into Wednesday morning. SPC sref shows decent probabilities of more than 500 j kg of MLCAPE and 0-1km helicity of more than 100. Tropical airmass returns as GEFS shows precipitable water values climbing above 2 inches (+2-3 sd) and dewpoints rise back into 70s. 12z nam GFS support this thinking and show 30-40kt of 0-6km shear collocated with best instability. Linear convection looks to be favored but typical of these environments, we also need to be concerned with possibility of an isolated, short-lived tornado developing along line due to low lcls and high 0-500m helicity of over 100. For now, this is something to be aware of which will be refined in later forecasts. Front moves offshore around midday Wednesday. Drying and subsidence behind short wave will bring an end to showers storms by early Wednesday afternoon. A prolonged stretch of dry and more comfortable |
weather follows Thursday and into weekend as high pressure builds over region. Aviation 03z Monday through Friday Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Monday night ... Moderate confidence overnight... ifr-lifr CIGS MVFR-ifr vsbys mainly from kghg-kewb line eastward through the remainder of the night, otherwise, areas of MVFR cigs and some MVFR vsbys in patchy fog across the remainder of e coastal mass extending into E ri. May see some MVFR CIGS at times across NE ct and portions of the ct valley, mainly after 08z. Light sct showers patchy drizzle moving onshore mainly near and S of kghg and especially across CAPE cod and islands. Monday... conditions ranging fromVFR northwest to MVFR-ifr CIGS SE mass to start the day. Expect Sun heating to eat away at the sky cover, bringingVFR conditions to all areas. Exception to this could be nantucket and parts of CAPE cod, where 2000-3000 foot cigs may linger through the day. Northeast gusts to 20 knots mainly along the coastline. Monday night... vfr lingers in the west. MVFR ifr CIGS expands over eastern central mass and ri northeast ct due to marine flow. Kbos terminal... Moderate confidence in taf. MVFR cigs, around 1500 feet, across the airport, though may lower to ifr after 06z or so. May also see a few showers from time to time through the night with ifr vsbys in patchy fog. Conditions improve toVFR around 9-10 am. Kbdl terminal... High confidence in taf. MainlyVFR. May see brief MVFR CIGS after 08z through around 9 am or so. Outlook Tuesday through Friday ... Tuesday: mainlyVFR, with areas MVFR possible. Tuesday night: mainlyVFR, with areas ifr possible. Chance shra, tsra likely, patchy br. Wednesday: mainlyVFR, with local MVFR possible. Windy with local gusts to 30 kt. Chance shra, chance tsra, patchy br. Wednesday night through Friday:VFR. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Monday night ... High confidence. Ne winds through the period. Wind gusts near 25 knots slowly diminish tonight but 5-6 foot seas linger on the outer waters. A combination of wind and seas will keep small craft advisory in effect overnight mainly across the outer waters through Monday, then, then areal coverage slowly diminishes Monday night. Spotty light showers sprinkles are possible overnight into Monday morning, but coverage will be very limited. Mainly good visibility. Outlook Tuesday through Friday ... Tuesday: winds less than 25 kt. Areas of seas approaching 5 ft. Tuesday night: winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers, chance of thunderstorms, patchy fog. Wednesday: low risk for small craft advisory winds with gusts up to 25 kt. Local rough seas. Chance of rain showers, chance of thunderstorms, patchy fog. Wednesday night: winds less than 25 kt. Local rough seas. Thursday: winds less than 25 kt. Areas of seas approaching 5 ft. Thursday night through Friday: winds less than 25 kt. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... Small craft advisory until 10 pm edt Monday for anz250-256. Small craft advisory until midnight edt tonight for anz251. Small craft advisory until 6 am edt Tuesday for anz254-255. Synopsis... Wtb jwd near term... Evt jwd short term... Wtb long term... Jwd aviation... Wtb evt jwd marine... Wtb evt jwd |
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 |
| 44090 | 9 mi | 30 min | 66°F | 2 ft | ||||
| WAXM3 - Waquoit Bay Reserve, MA | 15 mi | 75 min | 1.9 | 68°F | 1018 hPa | 67°F | ||
| 44020 - NANTUCKET SOUND | 15 mi | 20 min | NE 16 G 19 | 69°F | 1017.1 hPa | 67°F | ||
| BZBM3 - 8447930 - Woods Hole, MA | 24 mi | 30 min | 66°F | 76°F | 1017.8 hPa | |||
| NTKM3 - 8449130 - Nantucket Island, MA | 31 mi | 36 min | NE 8.9 G 12 | 67°F | 75°F | 1017.1 hPa | ||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 35 mi | 70 min | NE 12 G 16 | 66°F | 5 ft | 1018.5 hPa (+0.0) | 65°F | |
| BUZM3 - Buzzards Bay, MA | 45 mi | 60 min | NE 19 G 21 | 68°F | 1018 hPa (-0.3) | |||
| FRVM3 - 8447386 - Fall River, MA | 46 mi | 36 min | 67°F | 79°F | 1019.1 hPa | |||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 47 mi | 30 min | NNE 9.9 G 14 | 67°F | 1018.5 hPa | |||
| FRXM3 | 47 mi | 30 min | 67°F | 66°F | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 48 mi | 70 min | NNE 12 G 14 | 67°F | 68°F | 4 ft | 1018.6 hPa (+0.4) | 65°F |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off) Help| 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 | 12 AM | 1 AM | 2 AM | |
| Last 24hr | NE G17 | NE G19 | NE G19 | NE G17 | NE G18 | NE G17 | NE G16 | NE G19 | NE G20 | NE G19 | NE G18 | NE G18 | N G18 | N G21 | NE G17 | NE G18 | NE G18 | NE G15 | N G15 | NE G14 | NE G17 | NE G11 | NE G13 | NE G14 |
| 1 day ago | S G12 | S G10 | SW G12 | SW G10 | SW G10 | SW G17 | SW G15 | SW G15 | SW G14 | SW G16 | SW G13 | SW G14 | W G13 | W G13 | SW G9 | SW G10 | NW G7 | N | NE | NE G6 | NE | NE G15 | NE G19 | NE G18 |
| 2 days ago | -- | SE | E | SE | SE | SW G10 | SW G10 | SW G11 | W G10 | SW G11 | SW G10 | S | SW G13 | SW G10 | S G11 | SW G8 | SW G9 | SW G10 | SW G10 | S G9 | S G11 | S G11 |
Airport Reports
EDIT (on/off) Help Click EDIT to display multiple airports| Airport | Dist | Age | Wind kt | Visibility | Sky/Weather | Temp | DewPt | Humidity | Pressure |
| Hyannis, Barnstable Municipal-Boardman Airport, MA | 2 mi | 64 min | NE 6 | 2.00 mi | Light Rain Fog/Mist | 67°F | 66°F | 100% | 1017.4 hPa |
| Otis Air National Guard Base, MA | 13 mi | 65 min | NNE 10 | 3.00 mi | Fog/Mist | 64°F | 64°F | 100% | 1018.3 hPa |
| Chatham, Chatham Municipal Airport, MA | 16 mi | 68 min | NE 9 | 2.00 mi | Fog/Mist | 66°F | 64°F | 96% | 1017.8 hPa |
| Provincetown Municipal Airport, MA | 21 mi | 64 min | NE 7 | 10.00 mi | Overcast | 66°F | 64°F | 93% | 1018.4 hPa |
Wind History from HYA (wind in knots)
| 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 | 12 AM | 1 AM | 2 AM | |
| Last 24hr | NE | NE | NE G17 | NE | NE | NE G17 | NE | NE G17 | NE G21 | NE G18 | NE G21 | NE G18 | NE G21 | N | N G18 | N | N | N | N | N | NE G16 | NE | NE | NE |
| 1 day ago | SW G18 | SW G19 | S | S | SW | SW | SW G20 | SW | SW | SW | SW G18 | SW | SW | SW | SW | NW | N | NW | Calm | N | NE | NE G18 | NE G18 | NE G17 |
| 2 days ago | Calm | Calm | Calm | Calm | NE | Calm | E | S | S | S | S | SW | S | SW | S | SW | SW | SW | SW G18 | SW G19 | SW | S |
Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of DataBarnstable Harbor
Click for Map
Mon -- 12:45 AM EDT Moonset
Mon -- 01:43 AM EDT 1.02 feet Low Tide
Mon -- 05:54 AM EDT Sunrise
Mon -- 07:40 AM EDT 8.61 feet High Tide
Mon -- 01:54 PM EDT 1.63 feet Low Tide
Mon -- 03:43 PM EDT Moonrise
Mon -- 07:33 PM EDT Sunset
Mon -- 07:58 PM EDT 9.55 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 12:45 AM EDT Moonset
Mon -- 01:43 AM EDT 1.02 feet Low Tide
Mon -- 05:54 AM EDT Sunrise
Mon -- 07:40 AM EDT 8.61 feet High Tide
Mon -- 01:54 PM EDT 1.63 feet Low Tide
Mon -- 03:43 PM EDT Moonrise
Mon -- 07:33 PM EDT Sunset
Mon -- 07:58 PM EDT 9.55 feet High Tide
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 |
| 2.6 | 1.3 | 1.1 | 1.8 | 3.1 | 5.1 | 7.1 | 8.4 | 8.6 | 8 | 6.8 | 5.3 | 3.5 | 2.1 | 1.6 | 2.2 | 3.5 | 5.3 | 7.4 | 9 | 9.5 | 9.1 | 8.1 | 6.5 |
Tide / Current Tables for Cape Cod Canal, Massachusetts Current
EDIT (on/off) Help One Week of DataCape Cod Canal
Click for Map
Mon -- 12:47 AM EDT Moonset
Mon -- 02:26 AM EDT 3.73 knots Max Flood
Mon -- 05:45 AM EDT -0.18 knots Slack
Mon -- 05:55 AM EDT Sunrise
Mon -- 08:25 AM EDT -3.82 knots Max Ebb
Mon -- 11:39 AM EDT 0.17 knots Slack
Mon -- 02:51 PM EDT 3.57 knots Max Flood
Mon -- 03:44 PM EDT Moonrise
Mon -- 06:03 PM EDT -0.18 knots Slack
Mon -- 07:34 PM EDT Sunset
Mon -- 08:52 PM EDT -3.99 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 12:47 AM EDT Moonset
Mon -- 02:26 AM EDT 3.73 knots Max Flood
Mon -- 05:45 AM EDT -0.18 knots Slack
Mon -- 05:55 AM EDT Sunrise
Mon -- 08:25 AM EDT -3.82 knots Max Ebb
Mon -- 11:39 AM EDT 0.17 knots Slack
Mon -- 02:51 PM EDT 3.57 knots Max Flood
Mon -- 03:44 PM EDT Moonrise
Mon -- 06:03 PM EDT -0.18 knots Slack
Mon -- 07:34 PM EDT Sunset
Mon -- 08:52 PM EDT -3.99 knots Max Ebb
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 |
| 2.4 | 3.3 | 3.7 | 3.7 | 3.3 | 2.4 | -1.4 | -3.1 | -3.8 | -3.7 | -3.2 | -2.1 | 1.5 | 2.9 | 3.4 | 3.6 | 3.4 | 2.7 | 0.7 | -2.8 | -3.8 | -4 | -3.7 | -2.9 |
Weather Map and Satellite Images
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GOES 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
Wind Forecast for Boston, MA (3,6,7,8)
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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. |