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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 7:30PM | Sunday August 25, 2019 12:26 PM EDT (16:26 UTC) | Moonrise 12:30AM | Moonset 3:49PM | Illumination 24% |  |
ANZ231 Cape Cod Bay- 1020 Am Edt Sun Aug 25 2019
.small craft advisory in effect until 6 pm edt this evening...
This afternoon..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Tonight..NE winds 15 to 20 kt, diminishing to around 10 kt after midnight. Seas 2 to 3 ft.
Mon..NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Mon night..E winds 5 to 10 kt. Seas 2 to 3 ft.
Tue and Tue night..E winds 5 to 10 kt. Seas 2 to 3 ft.
Wed..E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Wed night..E winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu..N winds around 5 kt. Seas around 2 ft. Patchy fog. Showers likely. Vsby 1 to 3 nm.
Thu night..NW winds around 5 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.
.small craft advisory in effect until 6 pm edt this evening...
This afternoon..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Tonight..NE winds 15 to 20 kt, diminishing to around 10 kt after midnight. Seas 2 to 3 ft.
Mon..NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Mon night..E winds 5 to 10 kt. Seas 2 to 3 ft.
Tue and Tue night..E winds 5 to 10 kt. Seas 2 to 3 ft.
Wed..E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Wed night..E winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu..N winds around 5 kt. Seas around 2 ft. Patchy fog. Showers likely. Vsby 1 to 3 nm.
Thu night..NW winds around 5 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 1020 Am Edt Sun Aug 25 2019
Synopsis for massachusetts and rhode island coastal waters.. High pressure moving over the maritimes will bring northeast winds to the southern new england coast this afternoon. The winds may be joined by a few light showers, especially across the waters south of boston. Northeast winds will be gradually shifting to the east by midweek. A tropical depression may form off the coast of florida early next week. This system may track close enough to affect the coastal waters with 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 moving over the maritimes will bring northeast winds to the southern new england coast this afternoon. The winds may be joined by a few light showers, especially across the waters south of boston. Northeast winds will be gradually shifting to the east by midweek. A tropical depression may form off the coast of florida early next week. This system may track close enough to affect the coastal waters with 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 North Plymouth, MA
Hourly EDIT Helplocation: 41.99, -70.68 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 251356 afdbox area forecast discussion national weather service boston norton ma 956 am edt Sun aug 25 2019 Synopsis Low clouds and light showers today. Dry and seasonable conditions beginning Monday and through midweek. Possible showers Wednesday night into Thursday, yet with an eye on the track and proximity to a tropical system offshore late week which could produce high surf and dangerous rip currents along the immediate shoreline. Near term until 6 pm this evening 10 am update... more like autumn than summer. Was optimistic that perhaps morning boundary layer mixing would push the boundary layer higher and entrain more dry air from h85 where its evident in thetae fields that dry air advection is prevailing (see N new england which saw the dry push yesterday and overnight). But alas, the cooler maritime push has won out beneath a building dry inversion (see 12z gray, me sounding). So looking at areas of overcast conditions especially for southeast new england and sadly right outside our office. Scattered showers this morning, light in nature, mainly drizzly, not a washout, aided by a well mixed boundary layer and some localized low-level convergence of E NE winds (which are mixing down lending to gusts up to 30 mph along the E SE shoreline of ma). But luckily the remainder of S new england is mixing out nicely and morning overcast conditions are becoming more broken to scattered. These areas warming up into the 70s while with the brisk onshore E ne flow areas of E SE new england will be cooler with highs around the upper 60s, mid 60s along the immediate E SE shoreline. The expectation is of two things: 1.) h85 dry air advection will continue to proceed that with boundary layer mixing should allow the erosion of lower level moisture, and 2.) that the dry-inversion will lower closer to the surface thereby limiting the low-level destabilization of the boundary layer. As noted yesterday, we saw cooling within the boundary layer below h8-7. The steep lapse rate profiles to the surface with any boundary layer heating would easily generate low clouds and showers till dry air (noted above) would scour out. Hoping for more sunshine along with favorable, dry conditions. A measure of optimism towards late-day for most areas except in and around the CAPE cod canal based on a consensus of near-term high- res guidance (including href and nbm). Short term 6 pm this evening through 6 pm Monday Tonight... clouds diminish a little, but remain in place over southern ri and southeast ma. Cross sections show moisture lingering below 900 mb until Monday morning. Clearing skies farther inland due to the subsidence from the maritime high. Dew points remain low dry, ranging from the mid 40s in NW mass to the 50s across much of southern new england. With light wind from the high pressure, expect temperatures to the 40s over western ma and the 50s to around 60 over the remainder of the region. E-ne wind gusts 25 to 30 mph along the south coast, while winds are light across northern and western mass. Monday... high pressure expands a little and brings drying clearing to the south coast. Expect a dry weather day. Temperatures aloft at the top of the mixed layer will be 8-10c, so daytime temperatures should be in the 70s. Long term Monday night through Saturday Highlights... * temperatures will remain cool into Tuesday, then will moderate to near and above normal by late this week * onshore winds will bring spotty light rain or showers at times into mid week, best chances on Wednesday * scattered showers will move across late Wednesday through Thursday details... Monday night and Tuesday... high pressure will remain across the region, with the center anchored across eastern canada into northern maine. This will keep a cool e-ne wind flow in place. 00z models indicating that the high center may actually slip S across the region by Tuesday, so the e-ne winds, which may gust up to 15-20 mph early Monday night will diminish. This will allow good subsidence and dry conditions during this timeframe. May still see onshore winds along the immediate coast on Tuesday. Temperatures will moderate to near normal levels on Tuesday with the lighter winds. Expect highs mainly in the 70s, but may hang near 70 along the immediate E coast. Wednesday through Friday... big question at this point will be the passing of the potential tropical system around the mid to late week period. 00z models starting to show more spread as the low shifts NE from off the carolina coast, which lends to lower confidence. In the meantime, a cold front tries to shift E out of the eastern great lakes to western ny pa. The western edge of the high will ever so slowly shift E wed, but the circulation around the offshore system will keep winds from the E or se. May also see some showers develop off the ocean across E mass into ri during the day. At this point, showers develop across western areas as the front approaches Wed night through Thu as the front passes. This could be slower, however, depending upon the timing and track of the passing offshore system. The early morning forecast still suggest that the tropical system will pass well southeast of nantucket. The most likely impact from this system may be a period of rough surf along ocean-exposed beaches. There may be another front that might approach late this week, but timing is very much in question. |
Aviation 14z Sunday through Thursday Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Monday ... High confidence. Today... low-endVFR away from E SE ma and all of ri, as well as high terrain. Around sct-bkn 040. Within MVFR, will hold around bkn- ovc 020. Sct -shra -dz for SE ma into ri. Hope is that 18-21z MVFR erodes and or lifts to low-endVFR while confining around the CAPE cod canal into evening. As to winds, E NE 10 to 15 kts sustained, upwards 20 kts sustained along the E SE ma coast with gusts up around 25 kts. Tonight... sct-bkn MVFR lingers overnight across SE ma and ri whereas else- where few-sct low-endVFR CIGS prevail. In regions ofVFR, could see some patchy ifr fg develop, especially within the mid-ct river valley of ma. E NE winds around 10 kts, strongest along the E SE coast with sustained 10 to 15 kts, gusts up around 20 kts. Monday... MVFR over ri and SE ma dissipating during the morning. Few-sct low-endVFR prevailing, most likely skc. E NE winds continue around 10 to 15 kts with strongest winds along the SE coast with gusts up to 20 kts. Kbos terminal... optimistic that -shra -dz will remain mostly S of the terminal. However bkn-ovc MVFR lingers till 16-18z then lifting and mixing out, becoming sct-bkn. E NE winds remaining breezy all day around 10 to 15 kts, gusts up to 20 kts. Kbdl terminal... through 16z there could be some brief MVFR conditions 020-030, but thinking by 16-18z low-end sct-bkn 040 CIGS prevail with a brisk NE wind around 10 to 15 kts. CIGS clearing out overnight. Outlook Monday night through Thursday ... Moderate confidence. Monday night through 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 ifr possible. Chance shra. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Monday ... High confidence. Long-fetch E NE winds will produce gusts 20 to 30 kt and seas building to around 5-6 feet. High pressure centered over the maritimes will maintain the ene wind through Monday, maintaining the rough seas on the outer waters through that time. Wind gusts of 20 to 25 kt are likely on the southern waters with 25 to 30 kt possible on the southern outer waters. Wind gusts diminish Monday as the maritime high pressure expands south. Small craft advisory continues. We extended the advisory period through the day Monday. No other significant changes were made. Outlook Monday night through Thursday ... Moderate confidence. Monday night: winds less than 25 kt. Seas up to 5 ft. 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. Local visibility 1 to 3 nm. Wednesday: winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers. Wednesday night: winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers, patchy fog. Areas of visibility 1 to 3 nm. Thursday: winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... Small craft advisory until 11 am edt Monday for anz232>234. Small craft advisory until 6 pm edt this evening for anz231- 236. Small craft advisory until 5 am edt Monday for anz235-237. Small craft advisory until 8 pm edt Monday for anz250-254>256. Synopsis... Wtb sipprell evt near term... Wtb sipprell evt short term... Wtb long term... Evt aviation... Wtb sipprell 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 |
| 44090 | 21 mi | 27 min | 66°F | 3 ft | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 25 mi | 37 min | 63°F | 66°F | 5 ft | 1025.9 hPa (+0.7) | ||
| WAXM3 - Waquoit Bay Reserve, MA | 29 mi | 102 min | N 2.9 | 70°F | 1025 hPa | 60°F | ||
| FRVM3 - 8447386 - Fall River, MA | 32 mi | 57 min | 66°F | 76°F | 1026.3 hPa | |||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 32 mi | 37 min | NE 18 G 23 | 63°F | 5 ft | 1026.6 hPa (+1.0) | 55°F | |
| BHBM3 - 8443970 - Boston, MA | 32 mi | 57 min | 64°F | 1027.2 hPa | ||||
| BZBM3 - 8447930 - Woods Hole, MA | 32 mi | 57 min | 68°F | 72°F | 1025.3 hPa | |||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 33 mi | 57 min | N 13 G 17 | 67°F | 1025.9 hPa | |||
| FRXM3 | 33 mi | 63 min | 66°F | 62°F | ||||
| 44029 - Buoy A0102 - Mass. Bay/Stellwagen | 37 mi | 83 min | NE 18 G 21 | 63°F | 65°F | 5 ft | 1027.3 hPa | |
| CPTR1 - 8452944 - Conimicut Light, RI | 40 mi | 57 min | N 17 G 23 | 64°F | 72°F | 1026.4 hPa | ||
| 44020 - NANTUCKET SOUND | 40 mi | 37 min | ENE 23 G 29 | 67°F | 74°F | 3 ft | 60°F | |
| PVDR1 | 40 mi | 57 min | NNE 9.9 G 17 | 65°F | 1026.8 hPa | 62°F | ||
| FOXR1 - 8454000 - Providence, RI | 40 mi | 57 min | ENE 13 G 18 | 63°F | 70°F | 1026.5 hPa | ||
| PRUR1 | 42 mi | 57 min | 66°F | 62°F | ||||
| NAXR1 - Narragansett Bay Reserve, RI | 43 mi | 102 min | NE 13 | 65°F | 1026 hPa | 63°F | ||
| PTCR1 - 8452951 - Potter Cove, Prudence Island, RI | 43 mi | 57 min | NE 12 G 16 | 66°F | 1026.6 hPa | |||
| BUZM3 - Buzzards Bay, MA | 45 mi | 87 min | NE 24 G 26 | 67°F | 1025.3 hPa (+0.4) | |||
| NWPR1 - 8452660 - Newport, RI | 48 mi | 57 min | N 12 G 18 | 65°F | 65°F | 1025.7 hPa | ||
| QPTR1 - 8454049 - Quonset Point, RI | 48 mi | 63 min | N 17 G 20 | 64°F | 74°F | 1026.1 hPa |
Wind History for Borden Flats Light at Fall River, MA
(wind in knots) EDIT (on/off) Help| 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 | 11 AM | |
| Last 24hr | NE G11 | NE G12 | NE G14 | NE | NE G16 | NE G17 | NE G20 | E G11 | NE | NE | NE | NE G9 | N | NW | N | N | NE | N | NE G13 | NE G15 | NE G14 | NE G20 | NE G16 | N G14 |
| 1 day ago | SW | W | S | N | NW | N | N | NE | NE | NW | N | N G15 | N | N G7 | N | N | NE G9 | NE G7 | N | N | N | N | NE | NE G11 |
| 2 days ago | SW | SW | SW | SW G23 | SW | SW | SW | SW | SW | SW | SW G17 | SW | SW | W | W | NW | N | N G10 | NW | N | N | NW G8 | W | W |
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 |
| Plymouth, Plymouth Municipal Airport, MA | 6 mi | 35 min | NE 10 G 18 | 10.00 mi | Overcast | 66°F | 57°F | 75% | 1026.9 hPa |
| Marshfield Airport, MA | 7 mi | 32 min | NE 13 G 22 | 10.00 mi | Overcast | 68°F | 59°F | 73% | 1027.1 hPa |
| Taunton, Taunton Municipal Airport, MA | 19 mi | 35 min | Var 6 | 10.00 mi | Overcast | 67°F | 59°F | 76% | 1026.3 hPa |
| Otis Air National Guard Base, MA | 24 mi | 31 min | ENE 17 G 24 | 10.00 mi | Overcast | 68°F | 59°F | 73% | 1026.1 hPa |
Link to 5 minute data for KPYM
Wind History from PYM (wind in knots)
| 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 | 11 AM | 12 PM | |
| Last 24hr | E | NE G20 | NE G17 | N G19 | NE G18 | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE G22 | NE G18 |
| 1 day ago | W | N | N | E | Calm | Calm | Calm | Calm | N | N | N | N | N | N | N | N | NW | N | N | N | NE | NE | NE G18 | |
| 2 days ago | SW | S | SW | SW | SW | SW | S | SW | SW | SW | SW | W | W | NW | NW | NW | NW | W | N | W | SW | SW | SW |
Tide / Current Tables for Plymouth, Massachusetts
EDIT Weekend mode (on/off) (on/off) Help One Week of DataPlymouth
Click for Map
Sun -- 12:30 AM EDT Moonrise
Sun -- 01:13 AM EDT 0.97 feet Low Tide
Sun -- 06:00 AM EDT Sunrise
Sun -- 07:13 AM EDT 8.43 feet High Tide
Sun -- 01:26 PM EDT 1.43 feet Low Tide
Sun -- 03:48 PM EDT Moonset
Sun -- 07:28 PM EDT Sunset
Sun -- 07:31 PM EDT 9.74 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 12:30 AM EDT Moonrise
Sun -- 01:13 AM EDT 0.97 feet Low Tide
Sun -- 06:00 AM EDT Sunrise
Sun -- 07:13 AM EDT 8.43 feet High Tide
Sun -- 01:26 PM EDT 1.43 feet Low Tide
Sun -- 03:48 PM EDT Moonset
Sun -- 07:28 PM EDT Sunset
Sun -- 07:31 PM EDT 9.74 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 |
| 1.8 | 1 | 1.3 | 2.6 | 4.4 | 6.1 | 7.6 | 8.4 | 8.1 | 6.9 | 5.4 | 3.9 | 2.5 | 1.5 | 1.6 | 2.9 | 4.7 | 6.7 | 8.4 | 9.6 | 9.6 | 8.5 | 6.7 | 4.9 |
Tide / Current Tables for Cape Cod Canal, Massachusetts Current
EDIT (on/off) Help One Week of DataCape Cod Canal
Click for Map
Sun -- 12:31 AM EDT Moonrise
Sun -- 01:54 AM EDT 3.65 knots Max Flood
Sun -- 05:32 AM EDT -0.03 knots Slack
Sun -- 06:00 AM EDT Sunrise
Sun -- 08:26 AM EDT -3.75 knots Max Ebb
Sun -- 11:22 AM EDT 0.03 knots Slack
Sun -- 02:19 PM EDT 3.55 knots Max Flood
Sun -- 03:47 PM EDT Moonset
Sun -- 05:47 PM EDT -0.16 knots Slack
Sun -- 07:27 PM EDT Sunset
Sun -- 08:52 PM EDT -3.99 knots Max Ebb
Sun -- 11:56 PM EDT 0.17 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 12:31 AM EDT Moonrise
Sun -- 01:54 AM EDT 3.65 knots Max Flood
Sun -- 05:32 AM EDT -0.03 knots Slack
Sun -- 06:00 AM EDT Sunrise
Sun -- 08:26 AM EDT -3.75 knots Max Ebb
Sun -- 11:22 AM EDT 0.03 knots Slack
Sun -- 02:19 PM EDT 3.55 knots Max Flood
Sun -- 03:47 PM EDT Moonset
Sun -- 05:47 PM EDT -0.16 knots Slack
Sun -- 07:27 PM EDT Sunset
Sun -- 08:52 PM EDT -3.99 knots Max Ebb
Sun -- 11:56 PM EDT 0.17 knots Slack
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 |
| 2.7 | 3.4 | 3.6 | 3.4 | 2.8 | 1.8 | -1.7 | -3.1 | -3.7 | -3.6 | -3 | -1.6 | 2 | 3.1 | 3.5 | 3.4 | 3 | 2.1 | -1.2 | -2.9 | -3.7 | -4 | -3.6 | -2.6 |
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 (12,3,4,5)
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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. |