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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 5:54AM | Sunset 7:34PM | Wednesday August 21, 2019 4:08 AM EDT (08:08 UTC) | Moonrise 10:43PM | Moonset 11:32AM | Illumination 68% |  |
ANZ231 Cape Cod Bay- 345 Am Edt Wed Aug 21 2019
Today..S winds 5 to 10 kt. Gusts up to 20 kt this afternoon. Seas around 2 ft. A chance of showers with a slight chance of tstms this afternoon. Some tstms may produce gusty winds and heavy rainfall this afternoon.
Tonight..S winds 5 to 10 kt, becoming sw 10 to 15 kt after midnight. Gusts up to 20 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu..SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. A chance of showers.
Thu night..SW winds 5 to 10 kt, becoming nw after midnight. Seas around 2 ft. A chance of showers.
Fri..NW winds 5 to 10 kt. Seas 1 foot or less. A chance of showers.
Fri night..W winds around 5 kt, becoming N after midnight. Seas around 2 ft.
Sat through Sun..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 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.
Today..S winds 5 to 10 kt. Gusts up to 20 kt this afternoon. Seas around 2 ft. A chance of showers with a slight chance of tstms this afternoon. Some tstms may produce gusty winds and heavy rainfall this afternoon.
Tonight..S winds 5 to 10 kt, becoming sw 10 to 15 kt after midnight. Gusts up to 20 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Thu..SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. A chance of showers.
Thu night..SW winds 5 to 10 kt, becoming nw after midnight. Seas around 2 ft. A chance of showers.
Fri..NW winds 5 to 10 kt. Seas 1 foot or less. A chance of showers.
Fri night..W winds around 5 kt, becoming N after midnight. Seas around 2 ft.
Sat through Sun..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 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 345 Am Edt Wed Aug 21 2019
Synopsis for massachusetts and rhode island coastal waters.. A warm front will move north this morning drawing warm and very humid air over the waters. This will bring patchy fog as well as showers and scattered Thunderstorms today through Thursday. A cold front then sweeps across the waters sometime Thursday night into early Friday morning. Dry weather and good vsby follows for Friday into the weekend. 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 warm front will move north this morning drawing warm and very humid air over the waters. This will bring patchy fog as well as showers and scattered Thunderstorms today through Thursday. A cold front then sweeps across the waters sometime Thursday night into early Friday morning. Dry weather and good vsby follows for Friday into the weekend. 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 Brewster, MA
Hourly EDIT Helplocation: 41.77, -70.08 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 210741 afdbox area forecast discussion national weather service boston norton ma 341 am edt Wed aug 21 2019 Synopsis High pressure over southern new england moves offshore tonight providing seasonable dry weather. A warm front moves across the region Wednesday providing scattered showers and thunderstorms along with increasing heat and humidity. A cold front Thursday will bring another round of scattered showers and thunderstorms. The front moves offshore Friday with dry weather to follow into the weekend with mild days and cool nights along with comfortable humidity. Near term through today Warm front moves north into southern new england today bringing increasing moisture and instability. Northeast radars show several clusters of showers and tstms moving northeast toward vt, as well as a few showers storms in the lower hudson valley and south of long island moving toward SRN new england. Short range models such as the high res WRF show some showers with the warm air this morning, distinct from a second round of convection moving west to east this afternoon evening. The second round of precip is associated with a shortwave aloft and surface trough moving through later today this evening. Satellite trends show a broken layer of clouds with the convection. This along with normal diurnal trends would suggest the Sun will break through any cloud cover and generate the necessary daytime heating. Sb CAPE climbs to 1500-2500 j kg, as has been indicated in previous days, while LI values range from down to -7. Winds aloft show 30 kt at 850 mb and 35 kt at 500 mb. Helicity in the 0-3 km layer shows 150 to 250, a little higher than forecast in past days. Based on this we expect a continued risk of strong damaging thunderstorm winds. Precipitable water values will be around 2 inches today, with with lift generated by the shortwave and trough on an unstable airmass. As such, we continue to see a risk of downpours which could cause poor drainage flooding, especially in areas of thunderstorm training. The best chance of strong winds and downpours would be in NRN ct and central western ma. But aside from that relative comparison, all parts of our forecast area are in play for strong tstms and downpours. Short term tonight through 6 pm Thursday The shortwave and surface trough eventually move off to the east tonight, but timing should allow for additional evening convection with strong winds downpours. But this should diminish by midnight. Models show no significant chance in airmass, and dew points will be in the upper 60s and low 70s, so expect a humid night with areas of fog and lows in the upper 60s and low 70s. Closed low over james bay sweeps south and pushes a cold front south into new england. After the morning fog burns off, daytime heating will work on 16-18c 850 temps to warm the surface to the mid 80s to around 90. Low level humidity remains in place. Pw values diminish in the morning, but then climb back to near 2 inches in the afternoon. Instability parameters will not be as beefy as today, but will show 500-1000 j kg in the interior and 1000-1500 j kg in ri SE mass. So expect showers and scattered tstms especially in the afternoon. Long term Thursday night through Tuesday Highlights... * hot and humid Thu with a risk for a few showers t-storms near and south of the pike, shifting to the south coast Thu night * cooler and less humid fri * pleasantly warm days and cool nights this weekend into early next week details... Thursday night... instability diminishes after dark, better chance for showers and a few t-storms may be Thu night along the south coast as deeper moisture with pwat plume nearing 2 inches moves up along the south coast ahead of a shortwave and along the stalled frontal boundary which eventually pushes south and offshore by late Thu night. Friday... there is some uncertainty regarding how quickly clearing occurs near the south coast. It is possible clouds may linger into Fri near the south coast with a risk of a few showers. Otherwise, more sunshine likely north of the pike. Cooler post frontal airmass will yield highs mainly mid 70s to around 80 with low humidity. Saturday through Tuesday... ecmwf appears to be an outlier with development of closed low over new eng this weekend into early next week and not really supported by majority of its ensemble members. Trend is for mid level ridging to develop across the NE late in the weekend into early next week, with shower threat possibly increasing by Tue depending on timing of next shortwave. Coolest days likely Sun Mon with high pres in the maritimes with NE flow and will have to watch for some lower clouds during this time period. Overall, looking at highs mostly in the 70s and lows in the 50s this weekend into early next week, with highs in the 60s possible along the east coast Sun mon. |
Aviation 07z 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 ... Moderate confidence. Rest of tonight ... VFR. Today... vfr, with MVFR CIGS vsbys in showers and scattered thunderstorms. A few showers are possible this morning in ct and western ma, and are possible in all areas this afternoon and evening. The best chance for showers tstms will be in northern ct and western central ma in the afternoon and evening. A few strong storms are possible with gusty winds, frequent lightning, and heavy downpours. Tonight... MVFRVFR with scattered showers tstms especially in the evening. Southwest winds gusting to 20 kt, especially over CAPE cod and islands. Thursday... vfr MVFR in the morning...VFR in the afternoon with brief MVFR in showers tstms possible. Kbos terminal... moderate to high uncertainty in timing and coverage of showers tstms. A few showers storms possible mid to late morning, but best chance will be mid to late afternoon. Kbdl terminal... Moderate to high uncertainty in timing and coverage of showers tstms. A few showers storms possible after 7 am, but best chance will be mid to late afternoon. Outlook Thursday night through Sunday ... Moderate confidence Thursday night: mainlyVFR, with local MVFR possible. Slight chance shra. Friday through Sunday:VFR. 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. Today... Warm humid air moves back over the waters. South- southwest winds build with some gusts to 20 kt. Expect scattered showers and thunderstorms, with some strong wind gusts and downpours. Vsby 1-3 nm in downpours and patchy fog. Tonight... Showers and thunderstorms diminish after 10 pm. Vsby 1-3 nm in patchy fog. Persistant south to southwest winds will build waves to 5-6 feet, so we have issued a small craft advisory for some of the southern waters. Thursday... Winds continue from the southwest much of the day, ahead of an approaching cold front. Expect another round of showers and scattered thunderstorms. Winds will remain less than 25 kt while seas will be around 5 feet on parts of the southern waters. Outlook Thursday night through Sunday ... Moderate confidence. Thursday night: winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers, chance of thunderstorms. Friday through Friday night: winds less than 25 kt. Areas of seas approaching 5 ft. Saturday: winds less than 25 kt. Seas locally approaching 5 ft. Saturday night: winds less than 25 kt. Sunday: winds less than 25 kt. Areas of seas approaching 5 ft. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... None. Synopsis... Wtb kjc near term... Wtb kjc short term... Wtb long term... Kjc aviation... Wtb kjc marine... Wtb kjc |
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 | 14 mi | 39 min | 71°F | |||||
| 44020 - NANTUCKET SOUND | 22 mi | 39 min | SSW 7.8 G 9.7 | 73°F | 76°F | 71°F | ||
| WAXM3 - Waquoit Bay Reserve, MA | 27 mi | 84 min | Calm | 71°F | 1018 hPa | 69°F | ||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 30 mi | 79 min | S 7.8 G 9.7 | 69°F | 1 ft | 1017.4 hPa (-0.3) | 67°F | |
| NTKM3 - 8449130 - Nantucket Island, MA | 34 mi | 69 min | SSW 4.1 G 5.1 | 71°F | 77°F | 1017.9 hPa (-0.6) | ||
| BZBM3 - 8447930 - Woods Hole, MA | 36 mi | 69 min | 72°F | 74°F | 1017.6 hPa (-0.3) |
Wind History for Nantucket Island, MA
(wind in knots) EDIT (on/off) Help| 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 | 12 AM | 1 AM | 2 AM | 3 AM | |
| Last 24hr | W G10 | W | NW | W | NW G9 | NW G11 | NW G11 | NW G9 | N G10 | N G7 | N | NE | SE G7 | S G8 | S | SW G6 | SE | S | SE G5 | S | S G7 | S G6 | S | S |
| 1 day ago | SW G8 | SW G7 | S G8 | SW | SW | SW G7 | SW G10 | S G11 | SW G11 | SW G13 | SW G12 | SW | S G11 | SW G13 | SW G12 | SW G10 | W G9 | SW G12 | SW G10 | W G13 | W G8 | W G7 | W G9 | W G10 |
| 2 days ago | -- | W | W | W | W G5 | NW G7 | -- | NW | N | SW G11 | SW G10 | SW G8 | S G8 | S G9 | S G7 | S G9 | S G8 | SW G7 | S G7 | S G8 | S G9 | SW G9 | SW G8 |
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 |
| Chatham, Chatham Municipal Airport, MA | 7 mi | 17 min | S 3 | 10.00 mi | Fair | 71°F | 70°F | 96% | 1017.7 hPa |
| Hyannis, Barnstable Municipal-Boardman Airport, MA | 12 mi | 13 min | S 3 | 10.00 mi | Fair | 71°F | 68°F | 90% | 1017 hPa |
| Provincetown Municipal Airport, MA | 18 mi | 13 min | S 5 | 10.00 mi | Fair | 70°F | 66°F | 90% | 1017.2 hPa |
Link to 5 minute data for KCQX
Wind History from CQX (wind in knots)
| 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 | 12 AM | 1 AM | 2 AM | 3 AM | 4 AM | |
| Last 24hr | W | Calm | NW | NE | E | SE | SE | SE | Calm | Calm | S | S | Calm | S | S | SW | S | |||||||
| 1 day ago | SW | SW | SW | SW | SW | SW | SW G16 | SW G14 | SW G17 | SW G14 | SW G15 | SW G16 | SW G16 | SW G17 | SW | W | Calm | SW | SW | W | ||||
| 2 days ago | Calm | Calm | Calm | Calm | E | Calm | E | SW | S | S | S | S | Calm | S | SW | SW | SW | S |
Tide / Current Tables for Sesuit Harbor, East Dennis, Cape Cod Bay, Massachusetts
EDIT Weekend mode (on/off) (on/off) Help One Week of DataTide / Current data from XTide NOT FOR NAVIGATION
Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
EDIT (on/off) Help One Week of DataPollock Rip Channel
Click for Map
Wed -- 01:57 AM EDT -0.00 knots Slack
Wed -- 04:34 AM EDT -1.74 knots Max Ebb
Wed -- 05:54 AM EDT Sunrise
Wed -- 07:40 AM EDT 0.00 knots Slack
Wed -- 10:55 AM EDT 1.93 knots Max Flood
Wed -- 11:31 AM EDT Moonset
Wed -- 02:22 PM EDT -0.00 knots Slack
Wed -- 04:59 PM EDT -1.74 knots Max Ebb
Wed -- 07:30 PM EDT Sunset
Wed -- 08:07 PM EDT 0.00 knots Slack
Wed -- 10:42 PM EDT Moonrise
Wed -- 11:19 PM EDT 1.82 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Wed -- 01:57 AM EDT -0.00 knots Slack
Wed -- 04:34 AM EDT -1.74 knots Max Ebb
Wed -- 05:54 AM EDT Sunrise
Wed -- 07:40 AM EDT 0.00 knots Slack
Wed -- 10:55 AM EDT 1.93 knots Max Flood
Wed -- 11:31 AM EDT Moonset
Wed -- 02:22 PM EDT -0.00 knots Slack
Wed -- 04:59 PM EDT -1.74 knots Max Ebb
Wed -- 07:30 PM EDT Sunset
Wed -- 08:07 PM EDT 0.00 knots Slack
Wed -- 10:42 PM EDT Moonrise
Wed -- 11:19 PM EDT 1.82 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 |
| 1.5 | 0.9 | -0.1 | -1 | -1.7 | -1.7 | -1.3 | -0.6 | 0.3 | 1.2 | 1.8 | 1.9 | 1.7 | 1.2 | 0.4 | -0.7 | -1.5 | -1.7 | -1.5 | -0.9 | -0.1 | 0.8 | 1.5 | 1.8 |
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 (4,6,7,8)
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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. |