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Marine Weather and Tides
Version 3.4 |
5/20/2018 -- NOAA is having problems with the data feed that I use to draw the graphs. They are aware of the issue and working to resolve it. Sometimes changing the location by about a mile will give a correct graph. 3/3/2018 - There is a new GOES Satellite for the east coast that required rewriting that part of the code. Please report any issues. |
| Sunrise 5:12AM | Sunset 8:03PM | Wednesday May 23, 2018 11:10 AM EDT (15:10 UTC) | Moonrise 1:54PM | Moonset 2:21AM | Illumination 63% |  |
Marine Forecasts
EDIT (on/off) Help| ANZ231 Cape Cod Bay- 1029 Am Edt Wed May 23 2018 This afternoon..SW winds 5 to 10 kt. Seas around 2 ft. Tonight..W winds 5 to 10 kt, becoming ne after midnight. Seas around 2 ft. Thu..NE winds around 5 kt, becoming se in the afternoon. Seas around 2 ft. Thu night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Fri..SW winds 10 to 15 kt with gusts up to 25 kt. Seas around 2 ft. Fri night..SW winds 10 to 15 kt with gusts up to 25 kt. Seas around 2 ft. Sat..SW winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft. Sat night..SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Sun..E winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers. Sun night..E winds 5 to 10 kt. Seas 2 to 4 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 1029 Am Edt Wed May 23 2018 Synopsis for massachusetts and rhode island coastal waters.. Behind a departing low pressure area, winds will start out light southwesterly, then sea breezes develop this afternoon. A cold front will drop south across the waters tonight with a wind shift out of the ne then se as high pressure builds in behind it on Thu. The high will shift southeast of the waters Fri and Sat resulting in sw winds. A back door cold front drops southwest across the waters late day Sat with a wind shift out of the e/ne as high pressure builds over the canadian maritimes through Mon. Low clouds and fog, along with the chance of showers, perhaps even a Thunderstorm lingers this morning prior to a series of sweeping cold fronts later today. Thereafter, high pressure and light winds for late week, over the waters Thursday, southeast of the waters Friday. Warming ahead of a holiday weekend cold front with shower and Thunderstorm chances in advance. 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 231351 afdbox area forecast discussion national weather service boston norton ma 951 am edt Wed may 23 2018 Synopsis Isolated showers move offshore this morning, with a second set of showers possible this evening. Expect dry and warming weather Thursday and Friday. Saturday will also be warm, just before a cold front sweeps south across southern new england generating a few showers and scattered thunderstorms. Although it will not be a washout, the potential for showers will linger through the remainder of the memorial day weekend. Near term until 6 pm this evening 950 am update... low clouds fog patches earlier this morning have quickly given way to partial sunshine in most locations. 850t between +11c and +12c along with good mixing should yield highs in the lower 80s in many locations... Except a bit cooler where localized sea breezes occur. Dry weather generally prevails... But a shortwave may trigger a brief spot shower or two late this afternoon evening across eastern ma. Nothing more than than expected given lack of low level moisture. Short term 6 pm this evening through 6 pm Thursday Tonight... isolated shower activity over N E ma this evening, otherwise dry, turning cool. H3 jet streak amplified, diving S in response to enhanced upstream ridging, a n-stream vort-lobe and attendant colder h85 temperatures skirt by. N surface wind response, onshore along the coast. Drier airmass pushing across the region, lowering both dewpoints and temperatures. Push lows down into the upper 40s for many locations, potential impacts to sensitive vegetation. Thursday... high pressure in control, another pleasant day on tap. However beneath continued influence of skirting n-stream vort-lobe cooler airmass. Light winds overall, allowance of sea-breezes along the coast. Mixing up to around h85, can't rule out a few W wind gusts along the interior, especially over high terrain. Mixing drier air as well, dewpoints falling into the 30s for interior locations. Long term Thursday night through Tuesday Big picture... upper ridge over the northeast usa de-amplifies with time by the weekend, leaving a more zonal flow over the weekend and early next week. A shortwave trough ejects from the western usa into this zonal flow, eventually moving over the northeast usa early next week. Southern stream upper trough hovers over the gulf of mexico and brings tropical moisture to the gulf coast. The ECMWF keeps the tropical moisture south of mason-dixon through the period, while the gfs makes a stronger effort to move it up the east coast but then stalls out south of long island. Contour fields from Thursday onward remain above normal, although not excessively so. Thermal fields are near normal Thursday, then above normal most of the time through next Tuesday. The thermal fields do dip close to normal Sunday and Monday especially over ne mass. An easterly flow Sunday and Monday due to high pressure over the maritimes suggests a cooler surface layer underneath the warm deep layer, thus supporting the thermal indicators. Model mass and thermal fields are in general agreement through Saturday, then show growing differences early next week. Forecast confidence is good through Saturday, then diminishes to low early next week. Concerns... Thursday night through Saturday... high pressure offshore provides a west-southwest surface wind, so most places should warm up. The only air conditioning will be where this flow is an ocean flow, such as the outer CAPE and parts of cape ann. Mixing is forecast to reach about 825 mb each day, temps at that level support MAX sfc temps in the mid to upper 80s. Can't rule out a 90, especially if the mixing GOES a little deeper than expected. A cold front moves south Saturday. Precipitable water values build ahead of the front with GFS values reaching 1.5 inches Saturday afternoon evening. Model consensus shows total-totals in the upper 40s at that same time; mid level lapse rates are forecast at 6 to 6.5 c km, and lifted indices away from the south coast go sub-zero. So the potential is there for scattered thunder along with the showers. The front moves through early Saturday night, with winds shifting from the northeast behind the front. Sunday-Tuesday... the cold front stalls just south of the region Sunday, with northern stream high pressure building over the maritimes. This should bring cooler temperatures Sunday and Monday, most notable in eastern mass. With the front stalled nearby and weak disturbances moving |
through the flow, a chance of showers will linger each day with best chance along the south coast. As noted above, there remains uncertainty with how much tropical moisture works up the coast during the early week as well as if it reaches our area. This event, or non-event, remains in the low confidence part of the forecast. So we will maintain chance pops for this part of the forecast. Aviation 14z Wednesday through Sunday Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Thursday ... High confidence. Today... Most locations have already becomeVFR and any lingering lower CIGS vsbys near the south coast should improve by lunch time. Generally looking at NW winds of 5 to 15 knots but localized sea breezes likely for a time this afternoon. Tonight...VFR. Thursday... vfr. Sea-breezes along the coast. Kbos terminal... High confidence inVFR conditions. Potential sea- breeze around midday but probably is short-lived and done by early evening. Kbdl terminal... High confidence inVFR conditions. Outlook Thursday night through Sunday ... Moderate confidence. Thursday night through Friday night:VFR. Breezy. Saturday: mainlyVFR, with areas MVFR possible. Breezy. Chance shra, slight chance tsra. Saturday night: mainly MVFR, with local ifr possible. Chance shra, slight chance tsra, patchy br. Sunday: mainly MVFR, 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 Thursday ... High confidence. A series of cold fronts later this morning and again this evening, high pressure thereafter which will shift gradually e into the end of the week. Low clouds, fog, visibility issues ahead of the front with scattered showers, some thunder possible over the S waters this morning. Clearing out, high pressure building in, a weak pressure gradient, winds for the most part will be light allowing near-shore sea-breezes during the day. Outlook Thursday night through Sunday ... Moderate confidence. Thursday night: winds less than 25 kt. Seas locally approaching 5 ft. Friday: low risk for small craft advisory winds with gusts up to 25 kt. Areas of seas approaching 5 ft. Friday night: low risk for small craft advisory winds with gusts up to 25 kt. Local rough seas. Saturday: winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers, slight chance of thunderstorms. Saturday night: winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers, slight chance of thunderstorms. Sunday: winds less than 25 kt. Local rough seas. Chance of rain showers. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... None. Synopsis... Wtb sipprell near term... Frank short term... Sipprell long term... Wtb aviation... Frank sipprell wtb marine... Wtb 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 |
| 44090 | 9 mi | 41 min | 56°F | |||||
| WAXM3 - Waquoit Bay Reserve, MA | 15 mi | 86 min | 2.9 | 61°F | 1012 hPa | 58°F | ||
| 44020 - NANTUCKET SOUND | 15 mi | 31 min | WSW 7.8 G 9.7 | 57°F | 55°F | 1012.2 hPa | 55°F | |
| BZBM3 - 8447930 - Woods Hole, MA | 24 mi | 41 min | 57°F | 57°F | 1012.3 hPa | |||
| NTKM3 - 8449130 - Nantucket Island, MA | 31 mi | 47 min | WSW 8 G 13 | 57°F | 59°F | 1012.2 hPa | ||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 35 mi | 81 min | WSW 5.8 G 7.8 | 53°F | 1 ft | 1011.4 hPa (+0.0) | 53°F | |
| BUZM3 - Buzzards Bay, MA | 45 mi | 71 min | SW 14 G 15 | 54°F | 1012.6 hPa (+0.0) | |||
| FRVM3 - 8447386 - Fall River, MA | 46 mi | 47 min | 63°F | 58°F | 1012.3 hPa | |||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 47 mi | 41 min | SW 7 G 8 | 62°F | 1011.8 hPa | |||
| FRXM3 | 47 mi | 41 min | 65°F | 59°F | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 48 mi | 81 min | W 3.9 G 3.9 | 57°F | 56°F | 1 ft | 1011.2 hPa (+0.0) | 56°F |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off) Help| 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 | 6 AM | 7 AM | 8 AM | 9 AM | 10 AM | |
| Last 24hr | SW G11 | SW G11 | S G12 | SW G12 | S | S | S G8 | S G9 | S G10 | S G10 | S G11 | S G10 | S | NE | E | NE | NE | SE | NW G5 | W | E | SW | W G11 | W G12 |
| 1 day ago | N | N G8 | N | N | SW G8 | SW G9 | SW G11 | SW G12 | SW | SW G9 | SW G9 | SW G9 | SW G7 | SW G6 | SW G8 | SW G11 | SW G9 | SW | SW G8 | W | SW G7 | SW | SW G9 | SW |
| 2 days ago | SW G18 | SW G19 | SW G22 | SW G22 | SW G19 | SW G22 | SW G15 | SW G15 | SW G19 | W G11 | SW | W G9 | W | NW | NW G9 | NW | N G11 | N | N G12 | N G11 | N G9 | N G10 | N G10 | N G10 |
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 | 15 min | NW 10 | 10.00 mi | Mostly Cloudy | 68°F | 57°F | 70% | 1011.7 hPa |
| Otis Air National Guard Base, MA | 13 mi | 16 min | W 7 | 10.00 mi | Overcast | 64°F | 59°F | 83% | 1012.5 hPa |
| Chatham, Chatham Municipal Airport, MA | 16 mi | 19 min | NW 8 | 10.00 mi | Overcast | 67°F | 57°F | 71% | 1012.2 hPa |
| Provincetown Municipal Airport, MA | 21 mi | 15 min | W 7 | 10.00 mi | Fair | 65°F | 57°F | 76% | 1012 hPa |
Wind History from HYA (wind in knots)
| 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 | S | S | S | S | S | S | S | S | S | S | S | S | S | S | Calm | SW | Calm | SW | SW | SW | W | NW | NW | NW |
| 1 day ago | N | N | S | S | S | S | S | S | S | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | SW | Calm | S | SW | S |
| 2 days ago | SW G30 | SW G29 | SW G24 | SW G17 | SW | S | SW | SW | S | SW | Calm | NW | N | N | N | N | N | N | N | N | N | N G16 | N | N |
Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Barnstable Harbor Click for Map Wed -- 12:53 AM EDT 0.78 feet Low Tide Wed -- 02:21 AM EDT Moonset Wed -- 05:14 AM EDT Sunrise Wed -- 06:49 AM EDT 10.14 feet High Tide Wed -- 01:27 PM EDT 0.04 feet Low Tide Wed -- 01:53 PM EDT Moonrise Wed -- 07:33 PM EDT 9.94 feet High Tide Wed -- 08:01 PM EDT Sunset Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 1.3 | 0.8 | 1.7 | 3.4 | 5.6 | 7.9 | 9.7 | 10.1 | 9.4 | 8 | 6 | 3.7 | 1.5 | 0.2 | 0.3 | 1.5 | 3.5 | 6 | 8.3 | 9.7 | 9.8 | 9 | 7.4 | 5.4 |
Tide / Current Tables for Cape Cod Canal, Massachusetts Current
EDIT (on/off) Help One Week of Data| Cape Cod Canal Click for Map Wed -- 01:34 AM EDT 3.88 knots Max Flood Wed -- 02:22 AM EDT Moonset Wed -- 04:51 AM EDT -0.17 knots Slack Wed -- 05:15 AM EDT Sunrise Wed -- 07:48 AM EDT -4.44 knots Max Ebb Wed -- 11:02 AM EDT 0.01 knots Slack Wed -- 01:54 PM EDT Moonrise Wed -- 02:18 PM EDT 4.26 knots Max Flood Wed -- 05:44 PM EDT -0.20 knots Slack Wed -- 08:03 PM EDT Sunset Wed -- 08:28 PM EDT -4.24 knots Max Ebb Wed -- 11:42 PM EDT 0.19 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
| 12am | 1am | 2am | 3am | 4am | 5am | 6am | 7am | 8am | 9am | 10am | 11am | 12pm | 1pm | 2pm | 3pm | 4pm | 5pm | 6pm | 7pm | 8pm | 9pm | 10pm | 11pm |
| 3.2 | 3.8 | 3.8 | 3.5 | 2.6 | -1.1 | -3.3 | -4.2 | -4.4 | -4 | -3 | -0.6 | 2.9 | 3.9 | 4.2 | 4.2 | 3.7 | 2.6 | -1.6 | -3.5 | -4.2 | -4.2 | -3.6 | -2.4 |
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.
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Other links: Northern Pacific Contential US Full GOES-East
Wind Forecast for Boston, MA (11,2,3,4)
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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. |