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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 5:58AM | Sunset 7:28PM | Sunday August 25, 2019 7:17 PM EDT (23:17 UTC) | Moonrise 12:31AM | Moonset 3:46PM | Illumination 21% |  |
ANZ232 Nantucket Sound- 327 Pm Edt Sun Aug 25 2019
.small craft advisory in effect through Monday morning...
Tonight..NE winds 15 to 20 kt. Gusts up to 30 kt this evening. Seas 2 to 4 ft. A chance of sprinkles.
Mon..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of sprinkles.
Mon night..NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft.
Tue..E winds 5 to 10 kt. Seas 2 to 3 ft.
Tue night..SE winds 5 to 10 kt. Seas 2 to 3 ft.
Wed and Wed night..NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Thu..N winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
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.
.small craft advisory in effect through Monday morning...
Tonight..NE winds 15 to 20 kt. Gusts up to 30 kt this evening. Seas 2 to 4 ft. A chance of sprinkles.
Mon..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of sprinkles.
Mon night..NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft.
Tue..E winds 5 to 10 kt. Seas 2 to 3 ft.
Tue night..SE winds 5 to 10 kt. Seas 2 to 3 ft.
Wed and Wed night..NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Thu..N winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
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 327 Pm Edt Sun Aug 25 2019
Synopsis for massachusetts and rhode island coastal waters.. 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.. 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 Mashpee Neck, MA
Hourly EDIT Helplocation: 41.61, -70.44 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 251956 afdbox area forecast discussion national weather service boston norton ma 356 pm edt Sun aug 25 2019 Synopsis Scattered to broken low clouds continue into this evening, then dissipate into Monday as drier, more seasonable conditions develop through midweek. Possible showers sometime Wednesday into Thursday ahead of a cold front. Still keeping an eye on the track of a potential tropical system offshore late this week, which could produce high surf and dangerous rip currents along the immediate shoreline. Near term until 6 am Monday morning 2 pm update... cool summer day. At this point the boundary layer with the late summer Sun has mixed upwards of 3-5 kft agl and thus entrained drier air which is working S round high pressure situated over n new england into S canada. The challenge is along the E SE shore with the onshore flow component off the cool, moist maritimes. And with the prevailing low-level flow becoming more E with time we're seeing that broken to overcast lower cloud deck push further w into the interior. So some headaches with the temperatures and cloud cover, however feel the consensus of near-term high-res guidance including the nbm has a good handle on it. Wherever there is more of a N component of interior flow will see more scattered cloud decks, whereas with ocean-onshore flow clouds will be more broken to overcast. Winds have come up with boundary layer mixing with upwards of 30 mph wind gusts being observed across the CAPE and islands. Will see this wind persist into early evening and then taper slightly. Should remain breezy along the E SE shoreline into the overnight hours. More below. Tonight... clouds versus fog. High pressure and drier air squeezes S as evident in latest rap forecast guidance. Column drying, its parent inversion lowering towards the surface down to h975 to 950, N to s, moisture is trapped beneath which the boundary layer remains destabilized by the cool E NE onshore flow. Multiple factors to this forecast: 1.) depth of the dry-inversion, and 2.) direction of surface-h95 winds. Determines whether low clouds or possible dense fog. The 12z caribou, me an indication of outcomes where a dry-inversion is lower. Looking upstream at overnight observations, dry advection took place with surface dewpoints lowering despite light winds. Only a few spots reported dense fog given a decoupled boundary layer. For us, not much href support, signals of dense fog showing up for the worcester, ma region into northeast ct. Href overall points towards an E steering wind of low clouds over a good chunk of S new england, especially se, additional issues along e-slopes of higher terrain. Nbm and consensus of high-res guidance supports a cloudy solution as well. If clouds become more widespread, broken to overcast overnight, as perhaps dewpoints slip with the building presence of high pressure and a drying column aloft, then leaning with mild lows, shouldn't see much in the way of dense fog say isolated wherever clearing is allowed to proceed, higher confidence wherever it rained earlier today. Will hint again at low clouds along e-slopes of high terrain. Clouds win. Short term 6 am Monday morning through Monday night 2 pm update... Monday... looking to clear out. A continued long fetch off across the gulf of me, two things: 1.) sea-surface temperatures have lowered a bit with the turbidity and upwelling of the waters, and 2.) dry air advection will be quite strong and deeper within the column compared to today and sinking. So an expectation that low clouds will linger across new england during the morning hours, gradually dissipating S W with drier, subsiding pushing s. But not ruling out scattered to broken cloud decks given boundary layer mixing of onshore cool, moist air. Expect cloudy issues to linger especially s-coastal new england but lesser drizzle issues. Late summer Sun still strong while mixing out to h85 undergoing cold air advection, around +8c, another day of 70s throughout the interior while 60s along the E SE shore. Monday night... becoming clear. Daytime heating concludes, dry air and high pressure in place, looking at the boundary layer to decouple and light winds to prevail over most of S new england albeit the southeast. Warm air advection aloft, moisture is trapped beneath the dry inversion just above the surface. Dense fog not out of the question especially in areas of onshore flow and or higher dewpoints (notably earlier in the day with the cross-over threshold). Lean with cooler guidance and evaluate fog based on winds (below 3 mph) along with temperature- dewpoint thresholds of 2 degrees or less. This as a first guess, fog seemingly will be more prevalent Long term Tuesday through Sunday Highlights... * temperatures will remain below normal Tuesday, then will moderate to near and above normal by late this week * scattered showers will move across our region sometime late Wednesday into Thursday ahead of a cold front. Details... Tuesday... high pressure will remain across the region, or at least close by. Dry weather and below normal temperatures expected to continue. Onshore winds will keep the immediate coastal areas even cooler. Wednesday through Friday... the biggest question remaining to be answered will be how close a potential tropical system comes to southern new england during this time. Latest model guidance has trended ever so slightly west, but still well within the margin of error for a forecast this far out. Still expecting a cold front to slowly approach from the west late Wednesday into Thursday. At this point, expecting scattered showers with the cold front. Instability is too poor to warrant a mention of thunderstorms in the forecast. Rainfall chances would be significantly higher if the ocean low pressure comes even closer to our region. Time will tell. The most likely impact from this coastal system would 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. Near to above normal temperatures should prevail during this |
period. Saturday and Sunday... high pressure should be in control. Current forecast is for dry weather. Above normal temperatures Saturday, with below normal temperatures Sunday as this high pressure moves in. Aviation 20z Sunday 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 ... High confidence. 18z update... rest of today... sct-bkn low-endVFR over most of the terminals. MVFR lingering at 020 over e-coastal and SE ma terminals, on and off with the low-endVFR cigs. E NE winds 10 to 15 kts sustained, strongest along the E SE ma coast with gusts up around 25 kts, as high as 30 kts. Tonight... sct-bkn low-endVFR will lower into the overnight hours as E ne winds persist, light around 5 kts over the interior, around 10 to 15 kts along the shore. Higher confidence of into-morning MVFR for terminals along and S of the ma-pike, as well as along the e-slopes of high terrain. Patchy ifr fg possible where skc prevails in the n-ct river valley of ma. Monday... morning sct-bkn MVFR mostly along and S of the ma-pike lifting and becoming few-sct towards afternoon. E NE winds continue around 10 to 15 kts with strongest winds along the SE coast with gusts up to 20 kts. Monday night... few-sct CIGS may linger perhaps becoming bkn-ovc over southeast ma, but a greater concern is interior ifr fg. Current confidence is immediate W of the N W 495 beltway and within sheltered interior valleys through N ct and W ma. Light winds but a bit more brisk E NE flow 5-10 kts. Kbos terminal... clear out the -dz and hold bkn low-endVFR CIGS around 040. As we go into evening, sct-bkn CIGS prevail, lowering with time down to 020 where more sct conditions are favored. Kbdl terminal... sct-bkn low-endVFR around 040 into this evening. Can't rule out MVFR going into Monday morning but will leave it sct for now. Outlook Tuesday through Friday ... Moderate confidence. Tuesday through Tuesday night:VFR. Wednesday: mainlyVFR, with local MVFR possible. Chance shra. Wednesday night: mainlyVFR, with local ifr possible. Chance shra. Thursday: mainlyVFR, with local MVFR possible. 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 Monday night ... High confidence. E NE winds persist through Tuesday morning that'll contribute to an E swell and wave heights around 4 to 6 feet. Strong gusts presently will taper slightly overnight and then pick back up Monday with 20 to 25 kts. As high pressure builds from the n into midweek will see both winds and seas begin to subside. Small craft advisory headlines continue for a majority of the waters. Outlook Tuesday through Friday ... Moderate confidence. Tuesday: winds less than 25 kt. Seas up to 5 ft. Tuesday night: winds less than 25 kt. Areas of seas approaching 5 ft. Wednesday: winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers. Wednesday night: winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers. Local visibility 1 to 3 nm. Thursday: winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers. Thursday night through Friday: winds less than 25 kt. Seas locally approaching 5 ft. 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 8 pm edt this evening for anz231- 236-251. Small craft advisory until 5 am edt Monday for anz235-237. Small craft advisory until 8 pm edt Monday for anz250-254. Small craft advisory until 6 am edt Tuesday for anz255-256. Synopsis... Belk sipprell near term... Sipprell short term... Sipprell long term... Belk aviation... Belk sipprell marine... Belk 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 | 5 mi | 93 min | NW 2.9 | 66°F | 1024 hPa | 58°F | ||
| 44020 - NANTUCKET SOUND | 12 mi | 28 min | ENE 19 G 23 | 67°F | 73°F | 3 ft | 60°F | |
| BZBM3 - 8447930 - Woods Hole, MA | 14 mi | 48 min | 65°F | 72°F | 1024.2 hPa | |||
| 44090 | 17 mi | 48 min | 66°F | 2 ft | ||||
| NTKM3 - 8449130 - Nantucket Island, MA | 29 mi | 48 min | NE 15 G 21 | 66°F | 73°F | 1023.8 hPa | ||
| BUZM3 - Buzzards Bay, MA | 35 mi | 78 min | NNE 18 G 20 | 64°F | 1024.7 hPa (+0.0) | |||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 39 mi | 48 min | NNE 12 G 14 | 67°F | 1025 hPa | |||
| FRVM3 - 8447386 - Fall River, MA | 39 mi | 48 min | 65°F | 76°F | 1025.4 hPa | |||
| FRXM3 | 40 mi | 54 min | 65°F | 55°F | ||||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 44 mi | 28 min | NE 18 G 19 | 63°F | 6 ft | 1024.5 hPa (-1.1) | 57°F | |
| PRUR1 | 46 mi | 48 min | 65°F | 55°F | ||||
| NAXR1 - Narragansett Bay Reserve, RI | 48 mi | 93 min | NE 12 | 67°F | 1025 hPa | 58°F | ||
| NWPR1 - 8452660 - Newport, RI | 48 mi | 48 min | NE 11 G 17 | 65°F | 65°F | 1024.6 hPa | ||
| PTCR1 - 8452951 - Potter Cove, Prudence Island, RI | 48 mi | 48 min | ENE 12 G 14 | 65°F | 1025.4 hPa | |||
| CPTR1 - 8452944 - Conimicut Light, RI | 49 mi | 48 min | NNE 13 G 16 | 64°F | 72°F | 1025.3 hPa |
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 | N G18 | NE G17 | NE G18 | NE G17 | NE G19 | NE G16 | NE G17 | NE G17 | NE G16 | NE G13 | E G13 | 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 |
| 1 day ago | N G6 | N | N | NW | N | N G15 | N G15 | N G17 | N G16 | NE G16 | N G15 | 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 |
| 2 days ago | SW G11 | SW | SW G11 | SW G9 | SW G9 | W G9 | SW G10 | W G12 | NW G10 | SW | SW | W | N G5 | N G8 | N G11 | N G14 | N G11 | N | NW G9 | NW G8 | NW G8 | N G9 | N | N G9 |
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 |
| Otis Air National Guard Base, MA | 6 mi | 93 min | NNE 12 G 19 | 10.00 mi | Overcast | 64°F | 57°F | 78% | 1024.7 hPa |
| Hyannis, Barnstable Municipal-Boardman Airport, MA | 10 mi | 82 min | NNE 11 | 10.00 mi | Overcast | 67°F | 57°F | 73% | 1024.1 hPa |
| Marthas Vineyard Airport, MA | 17 mi | 85 min | NNE 10 | 10.00 mi | Overcast | 66°F | 57°F | 73% | 1024 hPa |
Link to 5 minute data for KFMH
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 | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | NE | E G18 | NE G22 | NE G25 | E G24 | E G29 | NE G28 | NE G22 | NE G20 | NE G21 | NE G19 | NE G17 | |
| 1 day ago | Calm | N | N | N | N | N | N | N | N | N | N | NE | NE | NE | NE G18 | NE G17 | NE G18 | NE G18 | NE | NE G14 | NE | |||
| 2 days ago | W | W | W | W | W | W | NW | N | N | N | N | N | N | NW | NW | NW | N | N | N | N | Calm | Calm |
Tide / Current Tables for Cotuit Highlands, Nantucket Sound, Massachusetts
EDIT Weekend mode (on/off) (on/off) Help One Week of DataCotuit Highlands
Click for Map
Sun -- 12:30 AM EDT Moonrise
Sun -- 01:40 AM EDT 0.26 feet Low Tide
Sun -- 06:00 AM EDT Sunrise
Sun -- 08:21 AM EDT 2.23 feet High Tide
Sun -- 01:54 PM EDT 0.38 feet Low Tide
Sun -- 03:46 PM EDT Moonset
Sun -- 07:26 PM EDT Sunset
Sun -- 08:38 PM EDT 2.57 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sun -- 12:30 AM EDT Moonrise
Sun -- 01:40 AM EDT 0.26 feet Low Tide
Sun -- 06:00 AM EDT Sunrise
Sun -- 08:21 AM EDT 2.23 feet High Tide
Sun -- 01:54 PM EDT 0.38 feet Low Tide
Sun -- 03:46 PM EDT Moonset
Sun -- 07:26 PM EDT Sunset
Sun -- 08:38 PM EDT 2.57 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 |
| 0.7 | 0.4 | 0.3 | 0.5 | 0.9 | 1.3 | 1.7 | 2 | 2.2 | 2.2 | 1.8 | 1.4 | 0.9 | 0.5 | 0.4 | 0.6 | 1 | 1.4 | 1.8 | 2.2 | 2.5 | 2.5 | 2.3 | 1.8 |
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 (19,4,5,8)
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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. |