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Marine Weather and Tides
Version 3.4 |
10/6/2018 Colors of tide XTide graphs changed to emphasize that they were upgraded. See next note. Comments welcome. 10/4/2018 I have fixed XTide and updated the harmonic files. There were some name changes so you might have to click EDIT to find the new station name. |
| Sunrise 5:12AM | Sunset 8:03PM | Friday May 24, 2019 5:35 AM EDT (09:35 UTC) | Moonrise 12:25AM | Moonset 10:12AM | Illumination 72% |  |
ANZ231 Cape Cod Bay- 441 Am Edt Fri May 24 2019
.gale warning in effect from 1 pm edt this afternoon through this evening...
Today..W winds 10 to 15 kt with gusts up to 25 kt, becoming N 20 to 25 kt with gusts up to 35 kt this afternoon. Seas 3 to 4 ft.
Tonight..N winds 15 to 20 kt with gusts up to 30 kt, becoming nw 5 to 10 kt after midnight. Seas around 5 ft, subsiding to 3 ft after midnight.
Sat..NW winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft.
Sat night..S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. A chance of showers in the evening, then showers likely after midnight.
Sun..SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft. A chance of showers in the morning.
Sun night..SW winds 5 to 10 kt, becoming nw after midnight. Seas around 2 ft.
Mon..NE winds 5 to 10 kt. Seas around 2 ft.
Mon night..S winds around 5 kt, becoming nw after midnight. Seas around 2 ft.
Tue..SE winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the afternoon.
Tue night..S winds 10 to 15 kt. Seas around 2 ft. A chance of showers. 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.
.gale warning in effect from 1 pm edt this afternoon through this evening...
Today..W winds 10 to 15 kt with gusts up to 25 kt, becoming N 20 to 25 kt with gusts up to 35 kt this afternoon. Seas 3 to 4 ft.
Tonight..N winds 15 to 20 kt with gusts up to 30 kt, becoming nw 5 to 10 kt after midnight. Seas around 5 ft, subsiding to 3 ft after midnight.
Sat..NW winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft.
Sat night..S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. A chance of showers in the evening, then showers likely after midnight.
Sun..SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft. A chance of showers in the morning.
Sun night..SW winds 5 to 10 kt, becoming nw after midnight. Seas around 2 ft.
Mon..NE winds 5 to 10 kt. Seas around 2 ft.
Mon night..S winds around 5 kt, becoming nw after midnight. Seas around 2 ft.
Tue..SE winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the afternoon.
Tue night..S winds 10 to 15 kt. Seas around 2 ft. A chance of showers. 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 441 Am Edt Fri May 24 2019
Synopsis for massachusetts and rhode island coastal waters.. A cold front will push offshore early today, followed by gusty north to northwest winds. High pres builds across new england tonight, then across the waters Sat. Another cold front moves across the waters Sat night, with another weak system moving across late Sunday. High pres builds across on Mon, with another system approaching Tue. 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 cold front will push offshore early today, followed by gusty north to northwest winds. High pres builds across new england tonight, then across the waters Sat. Another cold front moves across the waters Sat night, with another weak system moving across late Sunday. High pres builds across on Mon, with another system approaching Tue. 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 240807 afdbox area forecast discussion national weather service boston norton ma 407 am edt Fri may 24 2019 Synopsis Windy and seasonable conditions today. Much of Saturday looks dry with pleasant temperatures, but a fast moving disturbance will probably bring a period of showers late Saturday into early Sunday. The rest of Sunday into memorial day looks to be warm and mainly dry. Showers and cool temperatures return Tuesday as a warm front approaches from the south. Unsettled weather pattern lingers into Thursday, but not a washout. Near term until 6 am this morning 915 pm update... line of strong to severe storms along the cold front moving ese from central and eastern ny. Convection is firing within an area of mucapes 500-1000 j kg and 0-3km lapse rates 6.5-7 c km. Environment is much less favorable over new eng. There will be some elevated CAPE developing as the convection moves into sne but low level lapse rates are poor and surface instability is nil so expect a weakening trend. 3km NAM handing the convection reasonably well. Area of showers and sct t-storms expected to sweep across sne tonight, reaching NW ma 02-03z and rest of the region 03-06z. A few strong storms are possible in NW ma but activity will weaken as it approaches the coastal plain. Drying trend overnight behind the cold front with partial clearing. Short term 6 am this morning through 6 pm Saturday Friday into Friday night ... breezy, seasonable, dry conditions. Potent shortwave and mid-level h5 trof digs out towards SE canada promoting further cyclogenesis that along the backside of which will amplify the low-level wind profile and promote steep lapse rates to h8. Moisture lingering, one of two things: 1.) some light shower activity is possible along e-coastal ma, and 2.) all of S new england will see breezy n winds with gusts up as high as 40 mph but below wind advisory thresholds. Scattered to broken cloud decks, more than likely thicker further e. Highs around the upper 60s during the day. Both clouds and winds dissipate going into the evening and overnight, but lingering enough to limit radiational cooling. Lows down into the 40s. Long term Saturday night through Thursday Highlights... * period of showers Sat night, lingering into early Sun CAPE islands * warm and mainly dry Sun Mon with 80s Sun away from south coast * cool and potentially wet tue * showery pattern may persist into Thu but not a washout overview... overall pattern features sne on northern periphery of strong se conus subtropical ridge. As such, we will be vulnerable to shortwaves and fronts moving through the region with periods of showers from time to time, but warm and dry periods as well. Temps in the extended period will be changeable and dependent on where boundaries set up. Forecast confidence diminishes by Wed Thu due to uncertainty with location of shortwaves moving over the ridge and placement of boundaries. The ridge will get pushed to the east by thu as trough approaches from the lakes. Saturday night into Sunday... fast moving shortwave approaches Sat night and guidance is indicating an instability burst developing at the nose of a low level jet as low level theta-e ridge moves into the region. This will lead to some showers moving into sne and can't rule out a few t- storms as marginal instability develops aloft. The showers may linger into early Sun on the CAPE islands, otherwise drying Sun with westerly flow. Should see a fair amount of sunshine developing after some early morning clouds, with warm temps. 925 mb temps around 20c support highs in the low to mid 80s, except 70s along the south coast. A weak cold front move into the region in the afternoon and can't rule out an isolated t-storm as marginal instability develops in the afternoon. Monday... front is offshore with high pres building to the north leading to a mostly sunny day. Cooler temps aloft Mon but still a warm day with highs in the 70s and possibly 80 ct valley. Sea-breezes expected to develop keeping coastal communities a bit cooler. Tuesday... could be a wet and cool day as warm front approaches and gets jammed up to the southwest with moist onshore flow and cool high pres to the east. Numerous showers expected along with a few t-storms possible as instability aloft develops. Temps may end up cooler than forecast with potential for 50s in some locations if it's wet with SE flow. Wednesday into Thursday... low confidence for wed. Earlier guidance was hinting at summer heat moving into sne for Wed but latest guidance has backed off on this with boundary remaining near or south of new eng. It all hinges on positioning of shortwave riding over the ridge which models can't resolve at this time range. It is still possible the front pushes to the north with a hot day but this is very much uncertain and temps could end up below normal. Mid level trough approaches from the lakes region Thu which will lead to increasing risk of showers t-storms. If the warm air doesn't get in here for wed, the approaching trough and cold front should push warm temps into sne for Thu with potential for 80s. Aviation 08z Friday through Tuesday Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. |
Short term through Saturday ... Moderate confidence. 915 pm update... timing of showers and sct t-storms 03-04z bdl baf orh and bos pvd 04-05z, a bit faster than previous forecast suggested. Previous discussion... mostlyVFR across the region, though ifr with low ceilings starting to move in along the south coast of ri and ma. Line of thunderstorms out in western ny as of just before 00z will quickly sweep southeast. Should be affecting bdl baf locations about 02z, orh about 03z and then bos-pvd about 04z. Tried to keep tempo groups to primary 2 hour window for the activity. Tsra should be diminishing as things move across the region, so kept mostly the "vcts" aspect, and we can update later to better indicate the details of the thunder portion. Expect ifr MVFR conditions as the showers push through. Some llws will persist into the early overnight. A cold front will move through, generally after 06z, with conditions improving toVFR area wide by 12z. Gusty northwest surface winds tomorrow, with most taf locations seeing frequent gusts around 30kt from 15z through 20z or so. Potential for isolated gusts near 40kt. Winds diminish quickly Friday evening.VFR Friday night. Kbos terminal... Moderate confidence in taf. Kbdl terminal... Moderate confidence in taf. Outlook Saturday night through Tuesday ... Saturday night: mainly MVFR, with areasVFR possible. Breezy. Shra likely, slight chance tsra. Sunday: mainlyVFR, with local MVFR possible. Breezy. Slight chance shra, isolated tsra. Sunday night through Monday night:VFR. Tuesday: mainly MVFR, with areasVFR possible. Chance shra, slight chance tsra. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Saturday ... High confidence. Rest of today ... sw winds sustained around 10 to 15 kts, gusts around 20 to 25 kts will push seas 3 to 5 feet on the outer waters. Small craft advisories issued accordingly. Tonight... sw winds continue prior to a sweeping cold front during the early morning hours. Will see sustained 10 to 15 kts with gusts around 20 to 25 kts throughout as the cold front sweeps through, SW winds shifting w, waves building 5 to 7 feet on the outer waters. Lower visibility with any heavy showers or thunderstorms that are forecast ahead of the sweeping cold front. Heavy rain elements occurring around midnight. Friday into Friday night ... gales over the E waters by midday into afternoon with overcast cloud decks and possible light showers. Winds dissipating into evening and overnight. Waves on the outer waters possibly pushing up as high as 8 to 10 feet peaking close to sunset then dissipating thereafter. Outlook Saturday night through Tuesday ... Saturday night: winds less than 25 kt. Areas of seas approaching 5 ft. Rain showers likely, slight chance of thunderstorms. Sunday: winds less than 25 kt. Seas up to 5 ft. Slight chance of rain showers. Sunday night: winds less than 25 kt. Areas of seas approaching 5 ft. Memorial day: winds less than 25 kt. Seas locally approaching 5 ft. Monday night: winds less than 25 kt. Tuesday: winds less than 25 kt. Chance of rain showers, slight chance of thunderstorms. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... Gale watch from 2 pm edt this afternoon through this evening for anz231-232-250-254-255. Small craft advisory until 5 am edt early this morning for anz232>234. Small craft advisory until 11 pm edt this evening for anz235- 237. Small craft advisory until 2 pm edt this afternoon for anz250- 254>256. Synopsis... Sipprell ajn near term... Sipprell evt ajn short term... Sipprell long term... Kjc aviation... Kjc evt marine... Kjc sipprell 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 | 9 mi | 35 min | 52°F | 1 ft | ||||
| 44020 - NANTUCKET SOUND | 15 mi | 35 min | WSW 12 G 16 | 55°F | 1004.5 hPa (-2.7) | |||
| WAXM3 - Waquoit Bay Reserve, MA | 15 mi | 110 min | NW 1.9 | 58°F | 1005 hPa | 57°F | ||
| BZBM3 - 8447930 - Woods Hole, MA | 24 mi | 41 min | 57°F | 57°F | 1004.7 hPa | |||
| NTKM3 - 8449130 - Nantucket Island, MA | 31 mi | 41 min | WSW 8 G 13 | 55°F | 58°F | 1004.8 hPa | ||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 35 mi | 45 min | WSW 16 G 19 | 56°F | 3 ft | 1002.1 hPa (-1.7) | 53°F | |
| FRVM3 - 8447386 - Fall River, MA | 46 mi | 41 min | 60°F | 59°F | 1005.3 hPa | |||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 47 mi | 41 min | W 16 G 18 | 62°F | 1004.7 hPa | |||
| FRXM3 | 47 mi | 41 min | 61°F | 58°F | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 48 mi | 45 min | WSW 16 G 18 | 58°F | 52°F | 2 ft | 1001.8 hPa (-2.4) | 56°F |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off) Help| 6 AM | 7 AM | 8 AM | 9 AM | -12 PM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | -12 PM | 12 AM | -12 PM | -12 PM | 3 AM | 4 AM | 5 AM | |
| Last 24hr | SW | SW G11 | S G12 | S G14 | S G12 | S G14 | S G17 | S G15 | S G21 | S G19 | S G17 | S G14 | S G17 | S G16 | S G14 | S G17 | S G22 | SW G15 | SW G15 | SW G15 | ||||
| 1 day ago | NW G16 | N G14 | N G19 | N G15 | NE G11 | NE G15 | NE G12 | S G7 | SW | SW | SW G7 | SW | SW | SW | SW | SW | S G8 | |||||||
| 2 days ago | NW G15 | NW G14 | NW G21 | NW G17 | W G13 | NW G14 | W G18 | W G16 | SW G20 | W G15 | N G10 | N G15 | N G12 | NW G12 | NW G17 | NW G12 | NW G12 | NW G15 | NW G15 |
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 | 39 min | SW 7 | 7.00 mi | Mostly Cloudy | 58°F | 55°F | 93% | 1004 hPa |
| Otis Air National Guard Base, MA | 13 mi | 40 min | W 10 G 15 | 9.00 mi | Mostly Cloudy | 57°F | 57°F | 100% | 1004.7 hPa |
| Chatham, Chatham Municipal Airport, MA | 16 mi | 43 min | WSW 7 | 8.00 mi | Partly Cloudy | 58°F | 57°F | 97% | 1004.4 hPa |
| Provincetown Municipal Airport, MA | 21 mi | 39 min | WSW 13 | 10.00 mi | Fair | 57°F | 55°F | 93% | 1003.1 hPa |
Wind History from HYA (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 | SW | SW | S G17 | S | SW G18 | S | SW | SW | SW | SW | SW G20 | S | S G18 | S G19 | S G20 | SW G28 | SW G24 | SW | SW G22 | SW | SW | SW | SW | |
| 1 day ago | NW G18 | N G19 | N G20 | N G24 | N G26 | N G24 | N | N G18 | N | N | NE | NE | N | SW | S | SW | SW | S | S | SW | SW | SW | S | S |
| 2 days ago | W | NW G23 | NW G23 | NW G18 | NW G23 | NW G21 | NW G21 | NW G23 | NW G18 | N | N | N G16 | N G19 | N G21 | NW | NW G14 | NW | NW G19 | NW G18 | NW | NW G16 | NW | NW G22 | NW G18 |
Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
EDIT Weekend mode (on/off) (on/off) Help One Week of DataBarnstable Harbor
Click for Map
Fri -- 12:25 AM EDT Moonrise
Fri -- 03:53 AM EDT 9.95 feet High Tide
Fri -- 05:13 AM EDT Sunrise
Fri -- 10:12 AM EDT Moonset
Fri -- 10:37 AM EDT 0.53 feet Low Tide
Fri -- 04:37 PM EDT 8.84 feet High Tide
Fri -- 08:02 PM EDT Sunset
Fri -- 10:50 PM EDT 1.76 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 12:25 AM EDT Moonrise
Fri -- 03:53 AM EDT 9.95 feet High Tide
Fri -- 05:13 AM EDT Sunrise
Fri -- 10:12 AM EDT Moonset
Fri -- 10:37 AM EDT 0.53 feet Low Tide
Fri -- 04:37 PM EDT 8.84 feet High Tide
Fri -- 08:02 PM EDT Sunset
Fri -- 10:50 PM EDT 1.76 feet Low 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 |
| 3.7 | 5.7 | 7.8 | 9.4 | 9.9 | 9.3 | 7.9 | 6.1 | 4.1 | 2.1 | 0.8 | 0.6 | 1.7 | 3.3 | 5.3 | 7.3 | 8.6 | 8.8 | 8 | 6.8 | 5.2 | 3.5 | 2.2 | 1.8 |
Tide / Current Tables for Cape Cod Canal, Massachusetts Current
EDIT (on/off) Help One Week of DataCape Cod Canal
Click for Map
Fri -- 12:26 AM EDT Moonrise
Fri -- 01:54 AM EDT -0.02 knots Slack
Fri -- 04:55 AM EDT -4.28 knots Max Ebb
Fri -- 05:15 AM EDT Sunrise
Fri -- 08:05 AM EDT 0.01 knots Slack
Fri -- 10:13 AM EDT Moonset
Fri -- 11:11 AM EDT 3.99 knots Max Flood
Fri -- 02:49 PM EDT -0.04 knots Slack
Fri -- 05:28 PM EDT -3.86 knots Max Ebb
Fri -- 08:03 PM EDT Sunset
Fri -- 08:31 PM EDT 0.17 knots Slack
Fri -- 11:24 PM EDT 3.52 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Fri -- 12:26 AM EDT Moonrise
Fri -- 01:54 AM EDT -0.02 knots Slack
Fri -- 04:55 AM EDT -4.28 knots Max Ebb
Fri -- 05:15 AM EDT Sunrise
Fri -- 08:05 AM EDT 0.01 knots Slack
Fri -- 10:13 AM EDT Moonset
Fri -- 11:11 AM EDT 3.99 knots Max Flood
Fri -- 02:49 PM EDT -0.04 knots Slack
Fri -- 05:28 PM EDT -3.86 knots Max Ebb
Fri -- 08:03 PM EDT Sunset
Fri -- 08:31 PM EDT 0.17 knots Slack
Fri -- 11:24 PM EDT 3.52 knots Max Flood
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 |
| 3.3 | 2.5 | -0.9 | -3 | -4 | -4.3 | -3.9 | -3 | -0.9 | 2.7 | 3.6 | 4 | 3.9 | 3.4 | 2.5 | -1.2 | -3.1 | -3.8 | -3.8 | -3.2 | -1.9 | 1.8 | 3 | 3.5 |
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 (5,6,7,8)
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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. |