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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 5:55AM | Sunset 7:32PM | Thursday August 22, 2019 10:40 PM EDT (02:40 UTC) | Moonrise 11:15PM | Moonset 12:35PM | Illumination 50% |  |
ANZ231 Cape Cod Bay- 1019 Pm Edt Thu Aug 22 2019
Overnight..W winds 5 to 10 kt. Seas 1 foot or less. A chance of showers with a slight chance of tstms.
Fri..NW winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Fri night..W winds around 5 kt, becoming N 10 to 15 kt after midnight. Seas 2 to 3 ft.
Sat..N winds 10 to 15 kt. Seas 2 to 3 ft.
Sat night and Sun..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Sun night..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers.
Mon..NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers.
Tue..E winds 5 to 10 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.
Overnight..W winds 5 to 10 kt. Seas 1 foot or less. A chance of showers with a slight chance of tstms.
Fri..NW winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
Fri night..W winds around 5 kt, becoming N 10 to 15 kt after midnight. Seas 2 to 3 ft.
Sat..N winds 10 to 15 kt. Seas 2 to 3 ft.
Sat night and Sun..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Sun night..NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers.
Mon..NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers.
Tue..E winds 5 to 10 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 1019 Pm Edt Thu Aug 22 2019
Synopsis for massachusetts and rhode island coastal waters.. A cold front approaches the waters overnight with a few showers and Thunderstorms moving along it through Fri morning, namely across the south coast. The front moves offshore during the day Fri. Canadian high pres builds over the waters Fri and Sat bringing dry weather and less humidity. A stiff northeast wind develops Sun and persists through Tue as the high shifts over the maritimes. 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 approaches the waters overnight with a few showers and Thunderstorms moving along it through Fri morning, namely across the south coast. The front moves offshore during the day Fri. Canadian high pres builds over the waters Fri and Sat bringing dry weather and less humidity. A stiff northeast wind develops Sun and persists through Tue as the high shifts over the maritimes. 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 Sagamore, MA
Hourly EDIT Helplocation: 41.83, -70.55 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 230152 afdbox area forecast discussion national weather service boston norton ma 952 pm edt Thu aug 22 2019 Synopsis A cold front moves across southern new england overnight, then stalls just off the south coast. A wave of low pressure then moves along the front and close to the region. Scattered showers and embedded thunder may impact much of ct ri and southeast ma through Friday morning. The front moves farther offshore Friday afternoon with drier and less humid weather to follow. Canadian high pressure then provides dry weather Saturday with a mild afternoon and cool night. Onshore flow Sunday will yield cooler conditions along with a few showers possible. Cool weather likely lingers into early next week. Near term until 6 am Friday morning Cold front has moved into northern ma. Position of the front is well indicated by dew points. Dew points at 9 pm in ct-ri-se ma were 70 to 75 (oppressive humidity) while values at pittsfield, north adams, orange, fitchburg, and lawrence were in the mid to upper 50s. Radars show showers over nyc and SW ct moving east. This batch is mostly a concern of our south coast areas from around 1130 pm to 230 am. Sbcape from the spf rap shows 500-1000 j kg lingering over ct- ri-se ma through midnight, then diminishing. This should support the showers moving across from nyc. Synoptic support increases later tonight as canadian upper trough swings south, and our area moves under the right entrance region of the supporting upper jet. Pw values are forecast around 2 inches overnight, supplying moisture for clouds and showers thunder. We will continue to show an area of scattered showers thunder developing overnight along and south of the cold front, mainly areas south of the mass pike. Min temps will be highly dependant on the dew points. South of the front temps and dews will linger in the low to mid 70s. North of the front we expect temps to fall into the 60s, except mid to upper 50s along the berkshire east slopes and parts of northern worcester county. Short term 6 am Friday morning through Friday night 4 pm update ... Friday ... showers with embedded thunder and heavy rain possible during the morning across ct-ri and south of the ma pike, especially south coast of ri ma. For what it's worth the new 12z ec has trended slower with the departing rain shield, however all guidance including the cams support a drying trend in the afternoon along with sunshine developing from northwest to southeast. Should turn out to be a nice afternoon with highs in the upper 70s to lower 80s (seasonable for late aug) but very comfortable humidity with dew pts falling into the upper 40s and lower 50s! Friday night ... dry post frontal airmass overspreading the region with a cool north drainage flow. Thus leaned toward the cooler guidance with lows in the 50s regionwide, upper 40s for NW ma and around 60 for the big city of boston. Long term Saturday through Thursday 4 pm update ... highlights... * mild temperatures and dry conditions Saturday * cooler than normal temperatures expected Saturday through Monday, with spotty light rain or showers at times * temperatures moderate by mid week, with another chance for showers Tuesday through Thursday details... Saturday and Sunday... the weekend looks overall pleasant and cooler, with a very comfortably dry airmass in place. A large area of high pressure at the surface moves east from southern canada into northern new england and remains anchored there through the weekend. While some lingering weak troughing and cold pool aloft remain, high pressure and an especially dry column should keep rain chances to a minimum. Best chance of some showers will be on Sunday as moist low level advection increases on north easterly flow which could allow for some shallow showers... Can't rule out a pop up shower for most of the region but the best chance would be along the south and east coasts and coastal plain. Speaking of northeasterly flow around that surface high, the pressure gradient tightens on the southern end, bringing gusty northeast winds on Sunday (and to a lesser extent on Monday), mainly along the south coast into CAPE cod where winds could gust to 25-35 mph. Comfortable conditions both days under a deep cold pool. H85 temps down around 6-8c will support below average high temperatures in the 70s each day... 60s along the east coast on Sunday given increased onshore flow. Dewpoints remain comfortable in the 50s. Monday through Thursday... Monday looks to remain mostly dry with continued influence of high pressure and only a slowly moistening atmospheric column. Winds along the south coast remain gusty but start coming down. It's not until Monday night Tuesday that we really see signs of a warm frontal feature ahead of two incoming low pressure systems... One moving from the great lakes into canada, and another potentially approaching southern new england up the east coast. High degree of uncertainty on how these features play out and interact with each other, but the general idea will be increasing moisture as dewpoints surge back into the upper 60s Tuesday, into the 70s by Wednesday |
into late week. Overall an unsettled pattern with at least periodic rain chances Tuesday through Thursday as several frontal boundaries and shortwaves move through. Not much instability for thunder, at least through mid week given cool northeast flow. Temperatures remain a bit below normal Tuesday, in the 70s, before rebounding into the low 80s by mid-late week as warmer subtropical air is pulled up the coast downstream of the trough. Aviation 02z Friday through Tuesday Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Friday night ... Moderate confidence. Tonight... mainly dry initially.VFR-MVFR CIGS vsbys moving into ct-ri-se mass 03z to 06z. Isolated thunder possible. MainlyVFR and dry north of the ma pike. Friday... showers in MVFR-vfr possible during the morning across ri ct and southeast ma, especially along the south coast and islands. Otherwise trend will be forVFR, dry weather and NW winds. Friday night... vfr, dry weather and northerly winds. Kbos terminal... High confidence in taf kbdl terminal... High confidence in taf. Outlook Saturday through Tuesday ... Moderate confidence Saturday:VFR. Saturday night:VFR. Breezy. Slight chance shra. Sunday through Sunday night: mainlyVFR, with local MVFR possible. Breezy. Slight chance shra. Monday: mainlyVFR, with areas MVFR possible. Breezy. Chance shra. Monday night: mainlyVFR, with local MVFR possible. Breezy. Slight chance shra. Tuesday:VFR. Breezy. Slight chance shra. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Friday night ... High confidence. Tonight ... Scattered showers and isolated thunder especially 11 pm to 2 am along the southern waters. Additional showers arrive on most waters after 2 am. SW winds slowly shifting to nw as a cold front stalls over the southern waters. Seas lingering at 5 feet south of block island, but expected to diminish. We will continue the small craft advisory to 2 am. Friday ... Scattered showers with isolated thunder and heavy downpours possible in the morning, then trending drying in the afternoon from NW to se. Friday night ... Cold front offshore with wnw winds and dry weather. Outlook Saturday through Tuesday ... Moderate confidence. Saturday: winds less than 25 kt. Seas locally approaching 5 ft. Saturday night: winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers. Sunday: moderate risk for small craft advisory winds with gusts up to 30 kt. Seas up to 5 ft. Slight chance of rain showers. Sunday night: low risk for small craft advisory winds with gusts up to 25 kt. Seas up to 5 ft. Chance of rain showers. Monday: moderate risk for small craft advisory winds with gusts up to 25 kt. Seas up to 5 ft. Chance of rain showers. Monday night: winds less than 25 kt. Seas up to 5 ft. Slight chance of rain showers. Tuesday: low risk for small craft advisory winds with gusts up to 25 kt. Seas up to 5 ft. Slight chance of rain showers. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... Small craft advisory until 2 am edt Friday for anz254>256. Synopsis... Nocera bw near term... Wtb nocera bw short term... Nocera long term... Bw aviation... Wtb nocera bw marine... Wtb 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 |
| 44090 | 12 mi | 41 min | 67°F | |||||
| WAXM3 - Waquoit Bay Reserve, MA | 17 mi | 116 min | Calm | 75°F | 1011 hPa | 73°F | ||
| BZBM3 - 8447930 - Woods Hole, MA | 22 mi | 59 min | 76°F | 74°F | 1011.3 hPa | |||
| 44020 - NANTUCKET SOUND | 27 mi | 31 min | WSW 14 G 18 | 76°F | 76°F | 72°F | ||
| FRVM3 - 8447386 - Fall River, MA | 34 mi | 59 min | 79°F | 81°F | 1011.7 hPa | |||
| BLTM3 - 8447387 - Borden Flats Light at Fall River, MA | 34 mi | 53 min | WSW 7 G 8.9 | 79°F | 1011.2 hPa | |||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 34 mi | 51 min | SW 9.7 G 9.7 | 71°F | 1 ft | 1010.4 hPa (+1.1) | 71°F | |
| FRXM3 | 35 mi | 59 min | 79°F | 72°F | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 36 mi | 51 min | 74°F | 71°F | 1 ft | 1009.5 hPa (+1.5) | ||
| BUZM3 - Buzzards Bay, MA | 39 mi | 41 min | WSW 16 G 16 | 74°F | 1011.8 hPa (+0.8) | |||
| CPTR1 - 8452944 - Conimicut Light, RI | 43 mi | 53 min | W 5.1 G 7 | 78°F | 80°F | 1011.3 hPa | ||
| PRUR1 | 43 mi | 53 min | 77°F | 72°F | ||||
| NAXR1 - Narragansett Bay Reserve, RI | 44 mi | 116 min | W 4.1 | 77°F | 1011 hPa | 73°F | ||
| PTCR1 - 8452951 - Potter Cove, Prudence Island, RI | 44 mi | 53 min | WSW 1.9 G 2.9 | 77°F | 1012 hPa | |||
| PVDR1 | 44 mi | 53 min | W 1.9 G 5.1 | 80°F | 1011.4 hPa | 69°F | ||
| BHBM3 - 8443970 - Boston, MA | 45 mi | 59 min | 81°F | 1010.7 hPa | ||||
| NTKM3 - 8449130 - Nantucket Island, MA | 45 mi | 59 min | WSW 7 G 9.9 | 75°F | 77°F | 1011.5 hPa | ||
| FOXR1 - 8454000 - Providence, RI | 45 mi | 53 min | W 4.1 G 5.1 | 81°F | 76°F | 1010.9 hPa | ||
| NWPR1 - 8452660 - Newport, RI | 47 mi | 59 min | SSW 6 G 8 | 75°F | 70°F | 1011.4 hPa | ||
| 44029 - Buoy A0102 - Mass. Bay/Stellwagen | 48 mi | 97 min | W 5.8 G 7.8 | 73°F | 69°F | 1 ft | 1009.6 hPa | |
| QPTR1 - 8454049 - Quonset Point, RI | 48 mi | 59 min | W 5.1 G 6 | 78°F | 75°F | 1011.6 hPa |
Wind History for Borden Flats Light at Fall River, MA
(wind in knots) EDIT (on/off) Help| 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 | 8 PM | 9 PM | 10 PM | |
| Last 24hr | SW | SW | SW G18 | SW | SW | SW | SW | SW | S | S | SW | SW | SW | SW | SW | SW | SW G23 | SW | SW | SW | SW | SW | SW | SW G17 |
| 1 day ago | SW | SW | S | SW | S | S | S | S | S | S | SW | S G14 | S G12 | SE G14 | SW | SW G20 | S G20 | SW G26 | SW G20 | S G17 | S G20 | SW | S G19 | SW |
| 2 days ago | SW | SW | SW | SW | SW | SW | W | SW | NW | NW | NW | NW | NW | W | SW | SW | SW | SW | SW | SW | S | S | SW G8 | SW |
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 |
| Plymouth, Plymouth Municipal Airport, MA | 11 mi | 49 min | WSW 4 | 10.00 mi | Overcast | 77°F | 73°F | 88% | 1011 hPa |
| Otis Air National Guard Base, MA | 12 mi | 1.9 hrs | W 8 | 10.00 mi | Fair | 75°F | 71°F | 89% | 1011.2 hPa |
| Hyannis, Barnstable Municipal-Boardman Airport, MA | 18 mi | 45 min | WSW 7 | 10.00 mi | Mostly Cloudy | 78°F | 70°F | 76% | 1010.8 hPa |
| Marshfield Airport, MA | 20 mi | 46 min | Var 4 | 10.00 mi | Partly Cloudy | 81°F | 75°F | 84% | 1010.5 hPa |
| Provincetown Municipal Airport, MA | 22 mi | 45 min | SW 7 | 10.00 mi | Fair | 73°F | 72°F | 96% | 1010.8 hPa |
| New Bedford, New Bedford Regional Airport, MA | 24 mi | 48 min | SW 4 | 10.00 mi | Overcast | 76°F | 70°F | 82% | 1010.8 hPa |
Link to 5 minute data for KPYM
Wind History from PYM (wind in knots)
| 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 | 8 PM | 9 PM | 10 PM | |
| Last 24hr | SW G22 | SW | SW | SW | SW | SW | S | Calm | SW | SW | S | SW | SW | S | SW | SW | SW | SW | S | SW | SW | |||
| 1 day ago | Calm | Calm | Calm | Calm | Calm | Calm | Calm | S | S | S | S | S | S | S | S | S G14 | SW | SW G22 | SW | SW G18 | SW | S | SW | SW G19 |
| 2 days ago | SW | SW | Calm | SW | Calm | Calm | Calm | Calm | Calm | NW | NW | NW | N | NE | NE | E | SE | E | SE | SE | Calm |
Tide / Current Tables for Cape Cod Canal, Bournedale, Massachusetts
EDIT Weekend mode (on/off) (on/off) Help One Week of DataCape Cod Canal
Click for Map
Thu -- 04:02 AM EDT 5.95 feet High Tide
Thu -- 05:57 AM EDT Sunrise
Thu -- 10:18 AM EDT 0.79 feet Low Tide
Thu -- 12:35 PM EDT Moonset
Thu -- 04:23 PM EDT 6.22 feet High Tide
Thu -- 07:32 PM EDT Sunset
Thu -- 10:49 PM EDT 0.78 feet Low Tide
Thu -- 11:14 PM EDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Thu -- 04:02 AM EDT 5.95 feet High Tide
Thu -- 05:57 AM EDT Sunrise
Thu -- 10:18 AM EDT 0.79 feet Low Tide
Thu -- 12:35 PM EDT Moonset
Thu -- 04:23 PM EDT 6.22 feet High Tide
Thu -- 07:32 PM EDT Sunset
Thu -- 10:49 PM EDT 0.78 feet Low Tide
Thu -- 11:14 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 |
| 2.3 | 3.5 | 4.6 | 5.5 | 6 | 5.6 | 4.7 | 3.6 | 2.4 | 1.4 | 0.8 | 1 | 2 | 3.3 | 4.5 | 5.5 | 6.2 | 6.1 | 5.4 | 4.2 | 3 | 1.9 | 1.1 | 0.8 |
Tide / Current Tables for Cape Cod Canal, Massachusetts Current
EDIT (on/off) Help One Week of DataCape Cod Canal
Click for Map
Thu -- 02:33 AM EDT -0.02 knots Slack
Thu -- 05:41 AM EDT -4.03 knots Max Ebb
Thu -- 05:57 AM EDT Sunrise
Thu -- 08:36 AM EDT 0.18 knots Slack
Thu -- 11:34 AM EDT 3.80 knots Max Flood
Thu -- 12:35 PM EDT Moonset
Thu -- 03:02 PM EDT -0.13 knots Slack
Thu -- 06:06 PM EDT -3.92 knots Max Ebb
Thu -- 07:32 PM EDT Sunset
Thu -- 08:59 PM EDT 0.17 knots Slack
Thu -- 11:14 PM EDT Moonrise
Thu -- 11:58 PM EDT 3.72 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Thu -- 02:33 AM EDT -0.02 knots Slack
Thu -- 05:41 AM EDT -4.03 knots Max Ebb
Thu -- 05:57 AM EDT Sunrise
Thu -- 08:36 AM EDT 0.18 knots Slack
Thu -- 11:34 AM EDT 3.80 knots Max Flood
Thu -- 12:35 PM EDT Moonset
Thu -- 03:02 PM EDT -0.13 knots Slack
Thu -- 06:06 PM EDT -3.92 knots Max Ebb
Thu -- 07:32 PM EDT Sunset
Thu -- 08:59 PM EDT 0.17 knots Slack
Thu -- 11:14 PM EDT Moonrise
Thu -- 11:58 PM EDT 3.72 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 |
| 3.6 | 3 | 1.9 | -1.7 | -3.1 | -3.9 | -4 | -3.4 | -2.2 | 1.7 | 3.1 | 3.7 | 3.8 | 3.3 | 2.5 | 0.5 | -2.5 | -3.5 | -3.9 | -3.7 | -2.7 | 0.2 | 2.6 | 3.5 |
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 (22,6,7,8)
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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. |