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Marine Weather and Tides
Version 3.4 |
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports. 6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen |
| Sunrise 5:59AM | Sunset 7:26PM | Monday August 26, 2019 5:13 AM EDT (09:13 UTC) | Moonrise 1:18AM | Moonset 4:47PM | Illumination 18% |  |
ANZ231 Cape Cod Bay- 342 Am Edt Mon Aug 26 2019
Today..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Tonight..NE winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 2 to 3 ft.
Tue..N winds around 5 kt, becoming se in the afternoon. Seas 2 to 3 ft.
Tue night..S winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 2 to 3 ft.
Wed..SE winds 5 to 10 kt. Seas 1 foot or less. A chance of showers.
Wed night..E winds 5 to 10 kt. Seas 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu..N winds around 5 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu through Fri..SW winds 5 to 10 kt. Seas around 2 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.
Today..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft.
Tonight..NE winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 2 to 3 ft.
Tue..N winds around 5 kt, becoming se in the afternoon. Seas 2 to 3 ft.
Tue night..S winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 2 to 3 ft.
Wed..SE winds 5 to 10 kt. Seas 1 foot or less. A chance of showers.
Wed night..E winds 5 to 10 kt. Seas 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu..N winds around 5 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu through Fri..SW winds 5 to 10 kt. Seas around 2 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 342 Am Edt Mon Aug 26 2019
Synopsis for massachusetts and rhode island coastal waters.. High pressure over the maritimes will build south over the waters early this week. This will bring slowly diminishing wind and seas during that time. A tropical depression may form off the coast of florida early this week. If the tropical system tracks close enough to our waters it could bring elevated seas by mid week. A cold front will approach the waters from the west on Thursday. 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.. High pressure over the maritimes will build south over the waters early this week. This will bring slowly diminishing wind and seas during that time. A tropical depression may form off the coast of florida early this week. If the tropical system tracks close enough to our waters it could bring elevated seas by mid week. A cold front will approach the waters from the west on Thursday. 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 Province, MA
Hourly EDIT Helplocation: 41.99, -70.06 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 260828 afdbox area forecast discussion national weather service boston norton ma 428 am edt Mon aug 26 2019 Synopsis High pressure over the maritimes will build over southern new england today and maintain dry pleasant weather through Tuesday. Scattered showers Wednesday and Thursday ahead of a cold front. A potential tropical system may track well southeast of nantucket late Wednesday or early Thursday, which may produce high surf and dangerous rip currents along the immediate shoreline. Mainly dry conditions late this week into next weekend. Near term until 6 pm this evening High pressure centered over the maritimes is building south across new england. This is diminishing the wind over southern new england and decreasing the onshore flow of moist air and resulting clouds. It is also increasing the subsidence and resulting drying of the air. Most of the low clouds that lingered over ri and SE mass had dissipated by 230 am. Another area of clouds was becoming uncovered over georges bank... This was trending west and the current trend would bring it to the outer CAPE and nantucket around 930 am. That assumes it doesn't dissipate from subsidence along the way. Aside from the question of clouds over the CAPE this morning, the overall trend for southern new england is subsidence sunny skies dry air courtesy of the northern high pressure. Gusty east-northeast winds will be strongest on the islands, weakest in northern massachusetts. Gusts on the CAPE and islands may reach 20-25 mph. Solar mixing is expected to reach near 850-mb, where temperatures will be 8-10c. That suggests MAX sfc temperatures today will be in the 70s. Along the eastern mass coastline, a few spots may top out in the upper 60s. Short term 6 pm this evening through 6 pm Tuesday High pressure remains in control tonight and Tuesday. Light winds will allow temperatures to radiate tonight. Dew points will be 45 to 55, so min temps should range from the mid 40s inland through the 50s. The radiational cooling may also bring areas of fog. Favored areas include the ct river valley of mass, and the normal fog-developing spots region-wide. Subsidence should maintain clear or mostly clear skies during the day Tuesday. Deeper subsidence may limit the mixed layer to just 925-mb. Temps at 925 mb will be about 16c, equiv to 8-9c at 850 mb. That would support MAX sfc temps in the 70s. Long term Tuesday night through Sunday Highlights... * temperatures will moderate to near and above normal by late this week * scattered showers will move across the region Wednesday afternoon through midday Thursday as a cold front passes * high pressure will bring mainly dry conditions into next weekend details... Tuesday night... high pressure ridge across the region will slowly shift offshore. Skies should remain partly cloudy through the night, but clouds will slowly increase across western areas. With light and variable or calm winds, expecting temperatures to fall to near normal levels, mainly in mid to upper 50s except around 60 along the coast. Wednesday through Friday... still quite a few questions about the timing and track of the potential tropical system that will slowly push ne, along with the exit of the western periphery of the ridge moving offshore. At this point, appears the low should pass well SE of nantucket, seaward of the 40n 70w benchmark late Wed night or Thu morning. Best chance for showers will occur after 18z Wed through wed night. An approaching cold front will also slowly push east as the system moves ne. Rather stable airmass across the region should preclude any convection. However, the most likely impact from this coastal system would be a period of rough surf along ocean exposed beaches. As the low exits to the open atlantic Thursday, the cold front shifts e, moving offshore by Thu evening. Will see leftover showers through midday or early afternoon across E coastal areas. High pressure builds across with dry conditions and mostly sunny skies on Friday. Temperatures should run around 5 degrees above seasonal normals through the end of the week. Saturday and Sunday... another cold front will push across the region during Saturday. With a dry airmass in place, along with a moisture starved cold front, should see generally dry conditions along with light west to northwest winds. Expect above normal temperatures Saturday, with below normal temperatures Sunday as the high moves in. Aviation 09z Monday through Friday Forecaster confidence levels... low - less than 30 percent. |
Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Tuesday ... High confidence. Today... high pressure over new brunswick will maintain mostly clear skies across the region and east-northeast winds today with strongest winds gusting 20 to 25 kt across the south coast and islands. The high will build south over our area late today, diminishing the wind. There is some concern about an area of clouds over the ocean near georges bank, moving west. If these clouds hold together they should reach outer CAPE cod and nantucket about 930 am and affect the CAPE and islands with 2500 foot ceilings through the rest of the morning. This will need to be monitored. Tonight... high pressure over the region will bring clear skies and light wind. Radiational cooling will bring areas of fog, especially over the ct river valley in mass. And in the regular fog spots of SRN new england. Ifr CIGS vsbys in any fog. Tuesday... high pressure continues to bring mostly clear skies and light wind. Thin cirrus will move in from the west, most likely over ct and western ma. Kbos terminal... High confidence in taf.VFR clear with ene wind around 10 kt. Kbdl terminal... High confidence in taf.VFR clear with a light ene wind. Outlook Tuesday night through Friday ... Moderate confidence. Tuesday night:VFR. Wednesday: mainlyVFR, with local MVFR possible. Slight chance shra. Wednesday night: MVFR ifr conditions possible. Chance shra, patchy br. Thursday: mainlyVFR, with local MVFR possible. Slight chance shra. Thursday 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 Tuesday ... High confidence. High pressure over the maritimes is building south over the waters. But it continues to generate east-northeast winds over the southern new england waters with strongest winds south of the islands with gusts to 25 kt. The persistent wind has built seas to 5-7 feet as the high builds farther south today, the winds will diminish with light winds on all waters tonight and Tuesday. Seas will linger at 5-7 feet today and tonight, then diminish during the day Tuesday. We will maintain small craft advisories through that time. Outlook Tuesday night through Friday ... Moderate confidence. Tuesday night: winds less than 25 kt. Seas locally approaching 5 ft. Local visibility 1 to 3 nm. Wednesday: winds less than 25 kt. Slight chance of rain showers. Wednesday night: winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers, patchy fog. Visibility 1 to 3 nm. Thursday: winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers. Thursday night: winds less than 25 kt. Seas locally approaching 5 ft. Local visibility 1 to 3 nm. Friday: winds less than 25 kt. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... Small craft advisory until 11 am edt this morning for anz232>234. Small craft advisory until 6 pm edt Tuesday for anz250-251-254. Small craft advisory until 3 pm edt Tuesday for anz255-256. Synopsis... Wtb evt near term... Wtb short term... Wtb long term... Evt aviation... Wtb evt marine... Wtb evt |
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 |
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 16 mi | 84 min | NNE 16 G 18 | 63°F | 5 ft | 1023.5 hPa (-0.7) | 54°F | |
| 44090 | 18 mi | 44 min | 65°F | 2 ft | ||||
| 44020 - NANTUCKET SOUND | 36 mi | 54 min | NE 16 G 21 | 65°F | 73°F | 58°F | ||
| WAXM3 - Waquoit Bay Reserve, MA | 37 mi | 89 min | WNW 1.9 | 59°F | 1023 hPa | 57°F | ||
| 44013 - BOSTON 16 NM East of Boston, MA | 40 mi | 84 min | 64°F | 65°F | 4 ft | 1023.2 hPa (-0.9) | ||
| 44029 - Buoy A0102 - Mass. Bay/Stellwagen | 46 mi | 130 min | NNE 12 G 14 | 64°F | 65°F | 5 ft | 1024.5 hPa | |
| BZBM3 - 8447930 - Woods Hole, MA | 46 mi | 74 min | 61°F | 71°F | 1022.4 hPa (-1.4) | |||
| NTKM3 - 8449130 - Nantucket Island, MA | 49 mi | 74 min | NE 14 G 19 | 64°F | 71°F | 1022.1 hPa (-1.0) |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off) Help| 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 | 4 AM | 5 AM | |
| Last 24hr | E G14 | NE G16 | NE G19 | NE G21 | NE G20 | NE G22 | NE G23 | NE G25 | NE G23 | NE G24 | NE G22 | NE G19 | NE G21 | NE G21 | NE G21 | NE G21 | NE G20 | NE G19 | NE G19 | NE G18 | NE G17 | NE G18 | NE G18 | NE G18 |
| 1 day ago | NE G15 | N G15 | NE G15 | NE G16 | NE G15 | NE G16 | NE G14 | NE G15 | NE G15 | NE G15 | NE G17 | NE G17 | N G17 | N G18 | NE G17 | NE G18 | NE G17 | NE G19 | NE G16 | NE G17 | NE G17 | NE G16 | NE G13 | E G13 |
| 2 days ago | W | N G5 | N G8 | N G11 | N G14 | N G11 | N | NW G9 | NW G8 | NW G8 | N G9 | N | N G9 | N G6 | N | N | NW | N | N G15 | N G15 | N G17 | N G16 | NE G16 | N G15 |
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 |
| Provincetown Municipal Airport, MA | 8 mi | 18 min | NE 10 | 10.00 mi | Partly Cloudy | 61°F | 57°F | 87% | 1023.1 hPa |
| Chatham, Chatham Municipal Airport, MA | 20 mi | 2.4 hrs | NE 10 | 10.00 mi | Partly Cloudy | 64°F | 57°F | 78% | 1023.5 hPa |
| Hyannis, Barnstable Municipal-Boardman Airport, MA | 24 mi | 18 min | NNE 7 | 10.00 mi | Partly Cloudy | 62°F | 57°F | 84% | 1022 hPa |
Link to 5 minute data for KPVC
Wind History from PVC (wind in knots)
| 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 | 4 AM | 5 AM | |
| Last 24hr | NE | NE | NE | NE | NE G17 | NE | NE G19 | NE | NE | NE | NE | NE | NE G16 | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE |
| 1 day ago | N | N | N | N | NE | NE | NE | NE | NE G15 | NE | NE | NE | NE G17 | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE |
| 2 days ago | NW | N | N | N | W | SW | SW | W | W | NW | NW | N | N | Calm | Calm | Calm | N | N | N | N | N | N | N | N |
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
Mon -- 01:18 AM EDT Moonrise
Mon -- 02:02 AM EDT 0.55 feet Low Tide
Mon -- 05:59 AM EDT Sunrise
Mon -- 08:14 AM EDT 7.00 feet High Tide
Mon -- 02:16 PM EDT 0.97 feet Low Tide
Mon -- 04:46 PM EDT Moonset
Mon -- 07:23 PM EDT Sunset
Mon -- 08:30 PM EDT 8.23 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 01:18 AM EDT Moonrise
Mon -- 02:02 AM EDT 0.55 feet Low Tide
Mon -- 05:59 AM EDT Sunrise
Mon -- 08:14 AM EDT 7.00 feet High Tide
Mon -- 02:16 PM EDT 0.97 feet Low Tide
Mon -- 04:46 PM EDT Moonset
Mon -- 07:23 PM EDT Sunset
Mon -- 08:30 PM EDT 8.23 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 |
| 2.4 | 1.1 | 0.6 | 1 | 2.2 | 3.6 | 5 | 6.3 | 7 | 6.8 | 5.8 | 4.5 | 3.1 | 1.8 | 1 | 1.3 | 2.5 | 4.1 | 5.7 | 7.2 | 8.1 | 8.1 | 7.2 | 5.7 |
Tide / Current Tables for Provincetown, Massachusetts (2)
EDIT (on/off) Help One Week of DataProvincetown
Click for Map
Mon -- 01:18 AM EDT Moonrise
Mon -- 02:09 AM EDT 0.66 feet Low Tide
Mon -- 05:59 AM EDT Sunrise
Mon -- 08:18 AM EDT 8.32 feet High Tide
Mon -- 02:23 PM EDT 1.15 feet Low Tide
Mon -- 04:47 PM EDT Moonset
Mon -- 07:24 PM EDT Sunset
Mon -- 08:34 PM EDT 9.77 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 01:18 AM EDT Moonrise
Mon -- 02:09 AM EDT 0.66 feet Low Tide
Mon -- 05:59 AM EDT Sunrise
Mon -- 08:18 AM EDT 8.32 feet High Tide
Mon -- 02:23 PM EDT 1.15 feet Low Tide
Mon -- 04:47 PM EDT Moonset
Mon -- 07:24 PM EDT Sunset
Mon -- 08:34 PM EDT 9.77 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 |
| 3.1 | 1.5 | 0.7 | 1.1 | 2.5 | 4.1 | 5.9 | 7.4 | 8.3 | 8.1 | 7 | 5.5 | 3.8 | 2.3 | 1.3 | 1.4 | 2.8 | 4.7 | 6.6 | 8.4 | 9.6 | 9.7 | 8.7 | 6.9 |
Weather Map and Satellite Images
(on/off) HelpWeather Map
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 (5,6,7,8)
(on/off) Help
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. |