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Marine Weather and Tides
Version 3.4 |
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 5:24AM | Sunset 8:11PM | Monday July 22, 2019 6:44 PM EDT (22:44 UTC) | Moonrise 11:25PM | Moonset 10:43AM | Illumination 67% |  |
ANZ232 Nantucket Sound- 336 Pm Edt Mon Jul 22 2019
Tonight..SE winds around 10 kt, becoming W with gusts up to 20 kt after midnight. Seas 2 to 3 ft. Patchy fog. A slight chance of tstms. Showers likely this evening, then a chance of showers after midnight. Some tstms may produce heavy rainfall. Vsby 1 nm or less.
Tue..N winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 25 kt in the afternoon. Seas 2 to 4 ft. Patchy fog. Showers with tstms likely. Some tstms may produce heavy rainfall. Vsby 1 nm or less.
Tue night..N winds 5 to 10 kt, becoming ne after midnight. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 nm.
Wed..NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Wed night..SE winds around 5 kt, becoming nw after midnight. Seas 2 to 3 ft.
Thu..N winds around 5 kt, becoming E in the afternoon. Seas around 2 ft.
Thu night..SW winds around 5 kt. Seas around 2 ft.
Fri..SW winds around 5 kt. Seas 1 foot or less.
Fri night..S winds around 5 kt. Seas 1 foot or less.
Sat..SE winds 5 to 10 kt. Seas 1 foot or less.
Sat night..S winds around 5 kt. Seas around 2 ft. 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.
Tonight..SE winds around 10 kt, becoming W with gusts up to 20 kt after midnight. Seas 2 to 3 ft. Patchy fog. A slight chance of tstms. Showers likely this evening, then a chance of showers after midnight. Some tstms may produce heavy rainfall. Vsby 1 nm or less.
Tue..N winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 25 kt in the afternoon. Seas 2 to 4 ft. Patchy fog. Showers with tstms likely. Some tstms may produce heavy rainfall. Vsby 1 nm or less.
Tue night..N winds 5 to 10 kt, becoming ne after midnight. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 nm.
Wed..NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers.
Wed night..SE winds around 5 kt, becoming nw after midnight. Seas 2 to 3 ft.
Thu..N winds around 5 kt, becoming E in the afternoon. Seas around 2 ft.
Thu night..SW winds around 5 kt. Seas around 2 ft.
Fri..SW winds around 5 kt. Seas 1 foot or less.
Fri night..S winds around 5 kt. Seas 1 foot or less.
Sat..SE winds 5 to 10 kt. Seas 1 foot or less.
Sat night..S winds around 5 kt. Seas around 2 ft. 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 336 Pm Edt Mon Jul 22 2019
Synopsis for massachusetts and rhode island coastal waters.. A stationary front will remain near or just south of the southern waters tonight. Areas of low pres will move along this boundary tonight and Tue, bringing showers and scattered Thunderstorms, some with gusty winds and tropical downpours. Dry and more seasonable conditions return Wed through Fri as high pres builds across the waters. 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 stationary front will remain near or just south of the southern waters tonight. Areas of low pres will move along this boundary tonight and Tue, bringing showers and scattered Thunderstorms, some with gusty winds and tropical downpours. Dry and more seasonable conditions return Wed through Fri as high pres builds across the waters. 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 Barnstable Town, MA
Hourly EDIT Helplocation: 41.63, -70.31 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 222012 afdbox area forecast discussion national weather service boston norton ma 412 pm edt Mon jul 22 2019 Synopsis Low pressure will track along a frontal boundary draped across ct, ri and southeast ma tonight and will be accompanied by scattered showers and thunderstorms with heavy downpours possible. The front slides along or just offshore Tuesday with showers then focused across southern ri and southeast ma. The low and frontal boundary will move offshore Wednesday morning, followed by a stretch of dry, seasonable weather along with comfortable humidity arriving Wednesday afternoon and lingering through the weekend with temperatures gradually warming through the period. Near term until 6 am Tuesday morning Scattered rain showers and a few thunderstorms continue across southern new england early this afternoon. At the synoptic level we have a shortwave approaching in the mid levels generating a frontal wave to our southwest that will track northeast and bring strong to severe storms this afternoon and evening. Surface observations show the front over southern ct with an impressive convergence boundary in southeast ny southwest ct firing off severe storms to our west. This is the location of the best low level turning in the atmosphere together with ample instability. As southern zones warm sector with the advancing warm front dewpoints in the upper 60s will increase to the low 70s, and MUCAPE increases on the order of 1000-2000 j kg. Though mid level lapse rates are poor, shear values are quite good, which should allow for prolonged updrafts and organized, rotating storms. 0-6km bulk shear values will reach 40-50kts. Good low level rotation will increase tornado potential as well; 0-1km shear of 25- 35kts and 0-1km SRH approaching 150. The area of strongest updraft helicity (a good proxy for severe storm potential) continues to hit on southwest ct reaching into northern ct and ri. A severe thunderstorm watch has been issued for all of ct and ri through 10 pm. The main threat will be from damaging winds with the potential for an isolated tornado. Additionally these storms will come with some locally heavy downpours which could cause some urban and small stream flooding. Anomalous pwats approach 2.25" with plenty of lift ahead of the shortwave with placement under the entrance region of a 110kt 300mb jet. Heavy rain is possible through the overnight hours, especially over ct and western-central ma. A bit of a break comes after midnight before our next round arrives early Tuesday. Short term 6 am Tuesday morning through Tuesday night The trough axis remains to the west on Tuesday with another frontal wave moving up the coast bringing additional heavy rainfall. This time the axis of greatest pwats shifts southeast as the best lift from low level convergence and favorable upper jet dynamics aligns to bring the heaviest rainfall to ri and southeast ma. Another 1-2" is possible with locally higher amounts up to 3" leading to the risk of urban and poor drainage flooding. A 35-45kt LLJ moves over southern ri and southeast ma which could mix down gusty winds in heavy downpours as well, while retreating instability should keep the threat of thunderstorms to the south coast. The low lifts out of the area bringing rain to an end from west to east Tuesday evening into early overnight. Tuesday night should be mostly dry, but a third and final low crosses further to our southeast keeping a chance for some rain showers in the forecast for the south coast CAPE cod islands. Long term Wednesday through Monday Highlights ... * dry stretch of weather Wed afternoon into the weekend * seasonable temperatures and comfortable humidity Wed & thu * gradually becoming warmer and more humid Fri Sat Sun mon long wave trough and attending weak surface low south of long island 12z Wed advects eastward giving way to a drying trend Wed afternoon. Temps warm into the low 80s Wed afternoon but maybe only into the 70s eastern ma given later departure time of rain and cloud shield. Then a beautiful stretch of dry weather and comfortable humidity thu and Fri as upper trough lifts exits to the northeast and is replaced by rising heights and anticyclonic mid level flow. As 1026 mb high builds from the oh valley into new england expect warm days and comfortable nights with dew pts in the 50s. Weak pressure gradient will support afternoon seabreezes each day. High pressure remains anchored over southern new england Fri and sat but strong july Sun will gradually warm airmass with humidity remaining tolerable. By Sunday and Monday high moves offshore and return flow will yield increasing humidity, although typical for late july with dew pts in the 60s. Ensembles suggest mean trough sets up over the great lakes Sunday into early next week with subtropical ridge offshore. This will likely support dry weather here in southern new england with frontal boundaries remaining northwest of new england or fronts dissipating eastward into new england. Thus seasonably warm and humid Sunday into early next week at least by late july standards. Aviation 20z 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 ... Moderate to high confidence. 18z update... this afternoon... Mostly cloudy at most TAF sites withVFR conditions early, but bases lower by mid afternoon. Showers with isolated thunderstorms continue through the afternoon into the evening. Areas of MVFR- ifr conditions in any convection. Potential for strong wind gusts and heavy rainfall in any thunderstorms, mainly across N ct into ri. Light e-ne winds, with SE along the S coast during the afternoon. Tonight... Showers and thunderstorms linger into early tonight with areas of MVFR-ifr conditions. Showers linger through the night across central and southern areas, but conditions may improve to locallyVFR after 06z across N central and W mass but could still see scattered showers. Light s-sw winds becoming n after midnight. Tuesday... Showers remain across the region, with isolated thunderstorms possibly along the south coast through midday. Could see heavy downpours as well. Conditions slowly improve across the N central and western mass during the afternoon. Tuesday night: mainlyVFR, with areas ifr possible. Slight chance shra, patchy br. Kbos terminal... High confidence in taf. Kbdl terminal... High confidence in taf. Outlook Wednesday through Saturday ... High confidence. Vfr. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Tuesday night ... High confidence. Today... Showers and isolated thunderstorms move in through the evening. Visibility restrictions in patchy fog and heavy showers. Seas 3 ft or less. Tonight... Winds become SW up to 15-20 kt this evening on the southern waters, but remain e-ne on the eastern waters early. Seas build up to 5 ft on the outer waters as well as bi and ri sounds, so small crafts continue. Expect visibility restrictions in patchy fog and locally heavy downpours. Showers through the night, but any thunderstorms should end from n-s during the night, though may linger on the southern waters. Tuesday... Expect n-ne winds up to around 10 kt. Seas remain up to 5-6 ft on the southern waters through the day. Visibility restrictions continue in showers and patchy fog, with local thunderstorms during the morning along with locally heavy downpours. Outlook Wednesday through Saturday ... High confidence. Wednesday: winds less than 25 kt. Areas of seas approaching 5 ft. Wednesday night: winds less than 25 kt. Seas locally approaching 5 ft. Thursday through Saturday: winds less than 25 kt. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... Small craft advisory from 8 am Tuesday to 2 am edt Wednesday for anz235-237. Small craft advisory from 2 am Tuesday to 2 am edt Wednesday for anz250-254. Small craft advisory from 11 pm this evening to 8 am edt Wednesday for anz255-256. Synopsis... Nocera bw near term... Bw short term... Bw long term... Nocera aviation... Nocera bw marine... Nocera bw |
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 |
| 44020 - NANTUCKET SOUND | 10 mi | 64 min | 77°F | 1 ft | ||||
| WAXM3 - Waquoit Bay Reserve, MA | 12 mi | 119 min | W 1.9 | 79°F | 1009 hPa | 76°F | ||
| 44090 | 15 mi | 44 min | 74°F | 2 ft | ||||
| BZBM3 - 8447930 - Woods Hole, MA | 20 mi | 74 min | 76°F | 74°F | 1009 hPa | |||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 41 mi | 54 min | NE 7.8 G 7.8 | 69°F | 2 ft | 1009.8 hPa (-0.8) | 69°F | |
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 46 mi | 74 min | NE 12 G 17 | 80°F | 1009.3 hPa | |||
| FRVM3 - 8447386 - Fall River, MA | 46 mi | 74 min | 82°F | 80°F | 1009.8 hPa | |||
| FRXM3 | 46 mi | 74 min | 78°F | 69°F |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off) Help| -12 PM | -12 PM | -12 PM | 5 PM | -12 PM | 7 PM | -12 PM | -12 PM | -12 PM | 11 PM | -12 PM | -12 PM | -12 PM | 3 AM | -12 PM | 5 AM | -12 PM | -12 PM | -12 PM | -12 PM | -12 PM | -12 PM | -12 PM | 1 PM | |
| Last 24hr | SW G14 | SW G14 | SW G10 | W G12 | W G10 | SW G8 | ||||||||||||||||||
| 1 day ago | NE G11 | N G9 | ||||||||||||||||||||||
| 2 days ago |
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 | 4 mi | 1.8 hrs | E 5 | 10.00 mi | Overcast | 78°F | 72°F | 82% | 1009 hPa |
| Otis Air National Guard Base, MA | 11 mi | 49 min | NE 6 | 10.00 mi | Overcast | 77°F | 71°F | 83% | 1009.5 hPa |
| Chatham, Chatham Municipal Airport, MA | 18 mi | 52 min | E 10 | 10.00 mi | Partly Cloudy | 74°F | 70°F | 88% | 1009.7 hPa |
| Marthas Vineyard Airport, MA | 22 mi | 51 min | E 10 | 10.00 mi | Mostly Cloudy | 77°F | 71°F | 82% | 1008.9 hPa |
Wind History from HYA (wind in knots)
| 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 | W | W | W | W | SW | NW | W | Calm | NW | NW | N | N | N | N | N | N | N | N | N | N | N | NE | E | E |
| 1 day ago | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | W | W | SW | W | SW | W G24 | W G21 | W | SW G21 | SW G21 | W G22 | W | W |
| 2 days ago | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | W | W | W | W | W | W | NW | N | SW | SW | SW | SW | SW | SW |
Tide / Current Tables for Hyannis Port, Nantucket Sound, Massachusetts
EDIT Weekend mode (on/off) (on/off) Help One Week of DataHyannis Port
Click for Map
Mon -- 04:31 AM EDT 3.09 feet High Tide
Mon -- 05:25 AM EDT Sunrise
Mon -- 10:19 AM EDT 0.07 feet Low Tide
Mon -- 10:43 AM EDT Moonset
Mon -- 05:04 PM EDT 2.93 feet High Tide
Mon -- 08:08 PM EDT Sunset
Mon -- 10:38 PM EDT 0.30 feet Low Tide
Mon -- 11:24 PM EDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 04:31 AM EDT 3.09 feet High Tide
Mon -- 05:25 AM EDT Sunrise
Mon -- 10:19 AM EDT 0.07 feet Low Tide
Mon -- 10:43 AM EDT Moonset
Mon -- 05:04 PM EDT 2.93 feet High Tide
Mon -- 08:08 PM EDT Sunset
Mon -- 10:38 PM EDT 0.30 feet Low Tide
Mon -- 11:24 PM EDT Moonrise
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 |
| 1.1 | 1.7 | 2.2 | 2.7 | 3 | 3 | 2.7 | 2 | 1.2 | 0.5 | 0.1 | 0.2 | 0.7 | 1.2 | 1.7 | 2.3 | 2.7 | 2.9 | 2.8 | 2.3 | 1.6 | 0.9 | 0.4 | 0.3 |
Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
EDIT (on/off) Help One Week of DataPollock Rip Channel
Click for Map
Mon -- 01:46 AM EDT -0.00 knots Slack
Mon -- 04:26 AM EDT -1.71 knots Max Ebb
Mon -- 05:24 AM EDT Sunrise
Mon -- 07:33 AM EDT 0.00 knots Slack
Mon -- 10:42 AM EDT Moonset
Mon -- 10:59 AM EDT 2.01 knots Max Flood
Mon -- 02:19 PM EDT -0.00 knots Slack
Mon -- 04:56 PM EDT -1.69 knots Max Ebb
Mon -- 08:07 PM EDT 0.00 knots Slack
Mon -- 08:07 PM EDT Sunset
Mon -- 11:21 PM EDT 1.75 knots Max Flood
Mon -- 11:22 PM EDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Mon -- 01:46 AM EDT -0.00 knots Slack
Mon -- 04:26 AM EDT -1.71 knots Max Ebb
Mon -- 05:24 AM EDT Sunrise
Mon -- 07:33 AM EDT 0.00 knots Slack
Mon -- 10:42 AM EDT Moonset
Mon -- 10:59 AM EDT 2.01 knots Max Flood
Mon -- 02:19 PM EDT -0.00 knots Slack
Mon -- 04:56 PM EDT -1.69 knots Max Ebb
Mon -- 08:07 PM EDT 0.00 knots Slack
Mon -- 08:07 PM EDT Sunset
Mon -- 11:21 PM EDT 1.75 knots Max Flood
Mon -- 11:22 PM EDT Moonrise
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 |
| 1.5 | 0.8 | -0.2 | -1.2 | -1.7 | -1.6 | -1.2 | -0.5 | 0.4 | 1.3 | 1.8 | 2 | 1.8 | 1.3 | 0.3 | -0.7 | -1.5 | -1.7 | -1.5 | -0.9 | -0.1 | 0.8 | 1.4 | 1.7 |
Weather Map and Satellite Images
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GOES Local Image of Northeast 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 (18,4,5,8)
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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. |