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Marine Weather and Tides
Version 3.4 |
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. 6/25/2017 - NOAA is having a major issue that impact the 7 day forecast load times. Many users are reporting problems. The issue has been reported. 5/23/2017 - Worked with NOAA again to speed up the 7 day forecast load times. Thanks to them for being responsive. |
| Sunrise 5:50AM | Sunset 7:34PM | Saturday April 21, 2018 11:41 AM EDT (15:41 UTC) | Moonrise 10:27AM | Moonset 12:42AM | Illumination 37% |  |
Marine Forecasts
EDIT (on/off) Help| ANZ230 Boston Harbor- 929 Am Edt Sat Apr 21 2018 This afternoon..NW winds 5 to 10 kt. Gusts up to 20 kt early. Waves 1 foot or less. Tonight..NW winds 5 to 10 kt. Waves 1 foot or less. Sun..NW winds 5 to 10 kt, diminishing to around 5 kt in the afternoon. Waves 1 foot or less. Sun night..W winds around 5 kt, becoming nw around 5 kt after midnight. Waves 1 foot or less. Mon..N winds around 5 kt, becoming se in the afternoon. Waves 1 foot or less. Mon night..S winds 5 to 10 kt. Waves 1 foot or less. Tue..SW winds 5 to 10 kt. Waves 1 foot or less. Tue night..S winds 5 to 10 kt. Waves 1 foot or less. Wed..SE winds 5 to 10 kt. Waves 1 foot or less. Rain likely. Wed night..E winds 5 to 10 kt. Waves 1 foot or less. Showers likely. 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 929 Am Edt Sat Apr 21 2018 Synopsis for massachusetts and rhode island coastal waters.. High pressure will build over the waters today through Monday. Then shift offshore on Tuesday. Low pressure will move north along the eastern seaboard Tuesday night and Wednesday, lifting over the waters on Thursday. 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 Lynn, MA
Hourly EDIT Helplocation: 42.45, -70.95 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 211336 afdbox area forecast discussion national weather service boston norton ma 936 am edt Sat apr 21 2018 Synopsis High pressure building over the great lakes today moves east over new england for Sunday and Monday, then off to the east Tuesday. This will bring our area dry weather and gradually rising temperatures. Wet and breezy weather forecast midweek. Perhaps a late week lull before becoming dreary again next weekend. Near term until 6 pm this evening 935 am update... clear skies will give way to some fair weather CU late morning through the afternoon given cold air aloft acting on shallow low level moisture. Low level NW winds appear just strong enough to keep sea breezes just offshore. 850 mb temps -2c this afternoon with mixing depth around or a bit higher than 850 mb. Highs will reach mid upper 50s, which is just a few degrees below normal. Short term 6 pm this evening through 6 pm Sunday As the high pressure moves overhead, winds will become light and subsidence should make our skies clear. With dew points in the 20s, except 30-35 CAPE and islands, expect some areas away from the coast will dip below freezing, the rest will be in the 30s. The high maintains clear skies and light winds Sunday. This will allow sea breezes along the coast late morning through afternoon. Mixing will support MAX temps in the mid 50s to around 60. Long term Sunday night through Friday * highlights... - warm up early week, dry, watching for seabreezes - wet, breezy midweek - perhaps a reprieve Friday, possibly Saturday - return of wet, dreary weather for the following weekend overview and model preferences... defined ridging is expected to define the sensible wx early this coming week, with height anomalies finally becoming positive by early mon. H85 temps respond as well, reaching above 0c and likewise, positive anomalies. However, will need to watch a developing trof just W of the continental divide, a response to enhanced ridging along the W coast of the pacnw and bc. This wave shifts rapidly E through the early portion of the week and looks to phase with a slowly meandering S stream cutoff. This phasing will bring about a return to longwave trof across the e, and yield a return to unsettled and wetter wx reinforced yet again by a secondary shortwave out of the nw territories late week. Recent runs are struggling somewhat with the sfc low pres development track with the leading wave. This is likely due to the fact it will not be fully developed or sampled until sun. Given this, will lean most heavily on ensemble means to account for differences in final outcomes. Details... mon and tue... as mentioned above, ridging remains in control. H85 temps rise above 0c, to an average near +3c mon, then +5c on tue. This should allow several locations to reach the 60s. Can't rule out a stray 70f, but noting strong subsidence inversion which may limit mixing. Also, with weak flow under cresting high pres and ssts still in the low-mid 40s, sea breezes are likely especially mon, but also possible tue. This will lead to strong coastal temp gradient. Cool overnights with radiational cooling. Wed... low pres develops across out of the cold pool from remnant convection across the SE conus. Depending on how quickly the wave aloft deepens, the low will either track more n, or E with time. This is where the uncertainty in rainfall totals on wed reside. The E track would usurp the available moisture and shift strongest LLJ to the S while a deeper trof would draw the parent low moisture dynamics N toward new england. Ensemble means still favor the former over the latter, so this update will feature this solution, but this will need to be watched. In either case, pwats and LLJ nearly 2 std deviation above normal as well as a conditionally unstable profiles suggest at least a risk for periods of moderate to heavy rain unless the E track verifies. Low probs of QPF near 1.00 suggested. Thu and fri... the depth of the wave will also define sensible wx details on |
thu and fri. If the trof deepens later (the low pres E track suggested above), then Thu could feature continued wet and unsettled wx. Otherwise a brief period of meso-ridging will follow. Whether this occurs on Thu and Fri or Fri only is still somewhat uncertain. With a developing longwave trof and some moisture clouds shra possible either day, but pops will be generally lower than wed. Next weekend... as mentioned in the overview, a secondary trof will be moving across the CONUS and merging with the longwave trof, deepening it across the e. This may lead to another round of wetter and cooler than normal conditions, but this is of course toward the end of most deterministic ensemble skill set. Aviation 14z Saturday through Wednesday Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Sunday ... High confidence. No significant changes with 12z TAF update... today... vfr. Patchy daytime clouds this afternoon, but with bases above 4500 feet. Northwest winds with gusts around 20 knots midday and afternoon, diminishing by evening. Tonight and Sunday... VFR. Mainly clear skies and winds less than 20 knots. Developing sea breezes Sunday late morning and afternoon. Kbos terminal... High confidence in taf. Sea breezes unlikely today. Kbdl terminal... High confidence in taf. Outlook Sunday night through Wednesday ... High confidence. Sunday night:VFR. Monday through Tuesday:VFR. Tuesday night: mainlyVFR. Chance ra late. Wednesday: mainly MVFR, with local ifr possible. Breezy. Ra likely. Marine Forecaster confidence levels... low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Short term through Sunday ... High confidence. Northwest winds gusting to 20 knots today, then lighter winds tonight and Sunday. Seas remain below 5 feet through the weekend. Outlook Sunday night through Wednesday ... High confidence. Sunday night through Tuesday: winds less than 25 kt and weak seas. Tuesday night: winds less than 25 kt and weak seas. Slight chance of rain. Wednesday: winds less than 25 kt. Seas locally approaching 5 ft. Rain likely, rain showers likely. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... None. Synopsis... Wtb doody near term... Kjc short term... Wtb long term... Doody aviation... Wtb doody marine... Wtb doody |
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 |
| BHBM3 - 8443970 - Boston, MA | 8 mi | 41 min | 51°F | 1024.5 hPa (-0.9) | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 17 mi | 51 min | NW 9.7 G 12 | 44°F | 42°F | 1 ft | 1024.9 hPa (+0.0) | |
| 44029 - Buoy A0102 - Mass. Bay/Stellwagen | 21 mi | 97 min | 43°F | 42°F | 2 ft | 1024.1 hPa | ||
| IOSN3 - Isle of Shoals, NH | 40 mi | 41 min | NW 6 G 7 | 46°F | 1024.5 hPa (+0.0) | 24°F | ||
| BGXN3 - Great Bay Reserve, NH | 43 mi | 56 min | W 7 | 51°F | 1019 hPa | 29°F | ||
| 44098 - Jeffrey's Ledge, NH (160) | 48 mi | 35 min | 41°F | 2 ft |
Wind History for Providence, RI
(wind in knots) EDIT (on/off) Help| 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 | N G21 | N G26 | N G21 | NE G24 | N G23 | N G18 | N G20 | NE G17 | NE G16 | N G19 | N G18 | N | N G9 | NW | NW G10 | N | NW G12 | N G9 | NW G12 | NW G14 | N G14 | N G16 | N G14 | NE G18 |
| 1 day ago | E G8 | NE G8 | N | N G6 | NW G12 | NW G13 | NW G14 | NW G14 | N G12 | N G18 | N G16 | N G17 | N G17 | NW G18 | N G14 | NW G15 | NW G15 | NW G15 | N G11 | N G16 | N G20 | N G22 | N G19 | N G20 |
| 2 days ago | NW G19 | W G23 | NW G22 | N G18 | NW G16 | N G15 | NW G16 | NW G14 | NW G14 | NW G10 | N | NW G11 | NW G5 | W | W | W | W | S | N | SW | -- | NE | E | NE 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 |
| Boston, Logan International Airport, MA | 6 mi | 47 min | NW 9 G 18 | 10.00 mi | A Few Clouds | 50°F | 24°F | 36% | 1025.5 hPa |
| Beverly, Beverly Municipal Airport, MA | 9 mi | 48 min | NNW 13 G 18 | 10.00 mi | Fair | 51°F | 26°F | 38% | 1024.7 hPa |
| Bedford, Hanscom Field, MA | 18 mi | 1.8 hrs | NW 10 G 18 | 10.00 mi | A Few Clouds | 49°F | 21°F | 35% | 1027 hPa |
| East Milton, MA | 19 mi | 1.8 hrs | NW 9 G 23 | mi | 46°F | 23°F | 40% | 1026.3 hPa | |
| Lawrence Municipal Airport, MA | 21 mi | 47 min | NW 9 G 17 | 10.00 mi | Fair | 52°F | 24°F | 34% | 1025.7 hPa |
| Norwood, Norwood Memorial Airport, MA | 21 mi | 48 min | WNW 10 G 15 | 10.00 mi | Fair | 52°F | 25°F | 35% | 1025.6 hPa |
Wind History from BOS (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 | NW G23 | NW G23 | NW G25 | NW G23 | N G25 | NW G30 | NW G25 | NW G25 | NW G20 | NW G21 | NW G20 | NW | W | NW | W | W | W | W | W | W | NW | W | NW G19 | NW G18 |
| 1 day ago | N | NW | W | W | W | W | NW | NW | W | NW | NW | NW | W | NW G20 | W | W G19 | W | W | W | NW G21 | NW G27 | NW G21 | NW G24 | |
| 2 days ago | W G21 | W | W G23 | W G21 | W G21 | W | W | W G21 | W | W | W | W | W | W | SW | SW | S | W | SW | SW | NW | Calm | W |
Tide / Current Tables for Lynn, Lynn Harbor, Massachusetts
EDIT RT Ports Option Weekend mode (on/off) (on/off) Help One Week of Data| Lynn Click for Map Sat -- 12:41 AM EDT Moonset Sat -- 03:47 AM EDT 10.67 feet High Tide Sat -- 05:53 AM EDT Sunrise Sat -- 10:10 AM EDT -0.65 feet Low Tide Sat -- 10:27 AM EDT Moonrise Sat -- 04:30 PM EDT 9.43 feet High Tide Sat -- 07:32 PM EDT Sunset Sat -- 10:29 PM EDT 0.52 feet Low Tide 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 |
| 4.2 | 6.5 | 8.7 | 10.3 | 10.6 | 9.7 | 7.7 | 5.2 | 2.6 | 0.5 | -0.6 | -0.1 | 1.6 | 3.8 | 6 | 8 | 9.3 | 9.3 | 8.1 | 6.3 | 4.1 | 2.1 | 0.7 | 0.7 |
Tide / Current Tables for Marblehead Channel, Massachusetts Current
EDIT (on/off) Help One Week of Data| Marblehead Channel Click for Map Sat -- 12:41 AM EDT Moonset Sat -- 12:56 AM EDT 0.48 knots Max Flood Sat -- 04:32 AM EDT -0.00 knots Slack Sat -- 05:52 AM EDT Sunrise Sat -- 07:39 AM EDT -0.39 knots Max Ebb Sat -- 10:26 AM EDT Moonrise Sat -- 11:22 AM EDT 0.00 knots Slack Sat -- 01:26 PM EDT 0.43 knots Max Flood Sat -- 05:06 PM EDT -0.00 knots Slack Sat -- 07:32 PM EDT Sunset Sat -- 08:04 PM EDT -0.32 knots Max Ebb Sat -- 11:41 PM EDT 0.00 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 |
| 0.4 | 0.5 | 0.4 | 0.3 | 0.1 | -0.1 | -0.3 | -0.4 | -0.4 | -0.3 | -0.3 | -0.1 | 0.2 | 0.4 | 0.4 | 0.4 | 0.2 | 0 | -0.2 | -0.3 | -0.3 | -0.3 | -0.3 | -0.2 |
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 (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. |