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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 5:51AM | Sunset 7:44PM | Saturday August 17, 2019 9:13 AM EDT (13:13 UTC) | Moonrise 9:07PM | Moonset 7:39AM | Illumination 96% |  |
ANZ230 Boston Harbor- 717 Am Edt Sat Aug 17 2019
Today..SE winds 5 to 10 kt. Waves 1 foot or less. Patchy fog this morning with vsby 1 to 3 nm.
Tonight..SE winds 5 to 10 kt, becoming E after midnight. Waves 1 foot or less. Areas of fog. Vsby 1 nm or less.
Sun..SE winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less. Areas of fog. A chance of showers. Vsby 1 nm or less.
Sun night..S winds around 5 kt. Waves 1 foot or less. Patchy fog. A chance of showers.
Mon..S winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Mon night..SW winds 5 to 10 kt. Waves 1 foot or less.
Tue through Wed..SW winds 5 to 10 kt. Waves 1 foot or less. 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.
Today..SE winds 5 to 10 kt. Waves 1 foot or less. Patchy fog this morning with vsby 1 to 3 nm.
Tonight..SE winds 5 to 10 kt, becoming E after midnight. Waves 1 foot or less. Areas of fog. Vsby 1 nm or less.
Sun..SE winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less. Areas of fog. A chance of showers. Vsby 1 nm or less.
Sun night..S winds around 5 kt. Waves 1 foot or less. Patchy fog. A chance of showers.
Mon..S winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 nm.
Mon night..SW winds 5 to 10 kt. Waves 1 foot or less.
Tue through Wed..SW winds 5 to 10 kt. Waves 1 foot or less. 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 717 Am Edt Sat Aug 17 2019
Synopsis for massachusetts and rhode island coastal waters.. A weak ridge of high pressure across the region will result in light east to southeast winds today and into early Sunday. Winds will turn by Monday and through early next week as high pressure strengthens well to the southeast over the atlantic. 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 weak ridge of high pressure across the region will result in light east to southeast winds today and into early Sunday. Winds will turn by Monday and through early next week as high pressure strengthens well to the southeast over the atlantic. 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 Nahant, MA
Hourly EDIT Helplocation: 42.44, -70.94 debug
Area Discussion for - Boston, MA
(on/off) Help NOTE: mouseover dotted underlined text for definition| Fxus61 kbox 171153 afdbox area forecast discussion national weather service boston norton ma 753 am edt Sat aug 17 2019 Synopsis Mainly dry, seasonable conditions continue today, with a chance for showers and an isolated thunderstorm north and west. Humid, hot conditions return Sunday, with an increasing risk for some showers and thunderstorms. These conditions continue through midweek, when a cold front will sweep through. Drier and not as warm late next week. Near term until 6 pm this evening Only minor tweaks to the forecast this morning to reflect observed trends. Previous discussion... no huge changes to the prior forecasts we've had. In general, today will be a dry day, though it will feel a bit muggy. Quite a bit of low clouds across much of the region early this morning, with some areas of fog -- especially across far SE ma. Still some uncertainty as to how widespread the fog will be first thing this morning, but at this point thinking it won't be too bad (famous last words). Also watching showers approaching the ct border. Seem to be slowly weakening, but could reach the hartford area before they totally vanish. Have maintained some low pops in that area. The low clouds will slowly break up later this morning, but with ample moisture, they'll quickly be replaced by daytime cumulus. Net result is that we'll end up partly sunny. 925mb temperatures are on the rise, and will be around 19c in the east to 21c in the west. That should support temperatures in the mid 80s (especially in areas that get the most sun). A light south southeast flow will ensure cooler conditions will occur along the coast. Some surface based instability, with capes of 1000-1500 j kg is expected to develop across central western ma and northern ct this afternoon. Not a huge amount of forcing around locally (much better farther to our north and west), but an isolated shower or t-storm is not out of the question. Have painted in 20-30% pops across that area, generally using a blend of hi-res models as the foundation for that aspect of the forecast. Short term 6 pm this evening through 6 pm Sunday As of 300 am... models indicate a weak shortwave will zip across northern new england overnight. Despite the loss of daytime heating, the southern tail of that piece of energy will be close enough to keep the threat of showers or a thunderstorm going through the first half of the overnight -- especially for areas along and north of the mass pike. In addition, the shortwave will help to produce a decent amount of shear, with 0-6km shear progged to be 30-35kts in that area. That suggests the potential for some organization so perhaps we'll see a strong storm during the evening. Otherwise across the eastern half of the region, all guidance suggests a return of the low clouds and even better chances of widespread fog, much of it could be rather dense. Temperatures will only drop off to the mid 60s to low 70s in urban areas, with dewpoints still running high -- so it will be again muggy. Sunday we'll see southwest flow get deeper, with even more moisture pushing into the area. Precipitable water values will be approaching 2" by afternoon. Models are also indicating additional shortwave energy coming through at some point in the day. GFS has a single stronger wave, while the NAM is a bit disorganized with several weaker disturbances. Net result is the same however, that we should see scattered showers and a few t-storms develop. Primary area would be central and western ma and northern ct. Lesser chances across SE ma and the cape islands as low level southwest flow off the water will keep things stable. Don't see indications of strong organized convection, but perhaps more florida-like pulse type storms. With the high moisture values, brief downpours would be the primary threat. Temperatures should be a few degrees warmer as 925mb temperatures are in the 21-24c range. Given full sun, we would be talking about surface temperatures pushing 90f. However there should be a good deal of clouds, so I stuck a little bit toward some of the "cooler" guidance. Lots of mid 80s for highs (cooler along the coast) Long term Sunday night through Friday 17 00z guidance remains in rather good agreement with the overall synoptic pattern through the end of next week. With a dominant ridge across the southern usa, the northern tier remains under the influence of a decent mid level flow. This mid level flow will steer a series of shortwaves in our direction through mid week. While we have high confidence these waves will pass nearby, the timing remains more uncertain. Will continue to favor a consensus approach, with a bias toward typical convective climatology for our region. A cold front will start to approach our region Tuesday, but is unlikely to get enough push to completely cross southern new england until sometime Thursday. This will be the general period of greatest risk for any showers and thunderstorms. High pressure with drier weather expected for next Friday. |
Until this front crosses our region, it should remain very warm, if not hot, and very humid. Dewpoints should approach 70 degrees, raising the possibility of local downpours where it does rain. With temperatures around 90 degrees early next week, we may need heat advisories for a time. Aviation 12z 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 ... Moderate confidence. Expecting more widespread stratus this morning. Visibility dropped briefly around 12z, but should improve through 14z. Appears the low ceilings will be slow to lift dissipate, soVFR conditions aren't expected until 17z or so in most areas. MVFR ceilings will likely remain all day along off the south coast of ma. All available guidance indicates Saturday night has a higher probability of seeing widespread ifr, not only ceilings but visibility as stratus and fog is expected cover much of eastern ma and ri, especially after 02z or so. There is a small chance for a few showers or a thunderstorm across northern ct and western ma late this afternoon, with the chances increasing slightly Saturday night, and have included vcsh for baf and bdl tafs. Kbos terminal... Honestly, the easiest aspect of the forecast are winds, which will remain 10kts or less from 110-130 degrees. Ceilings expected to drop under 1000ft through 12z or so, but might stay a bit higher. Visibility forecast is low confidence through 12z. More confident for ifr visibilities Saturday night. Kbdl terminal... Overall moderate confidence in taf. Outlook Sunday night through Wednesday ... Moderate confidence. Sunday night: mainlyVFR, with local MVFR possible. Chance shra with isolated tsra. Patchy br. Monday through Monday night:VFR. Slight chance shra with isolated tsra. Tuesday through Wednesday:VFR. Chance shra with isolated tsra. 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. Primary marine concern will be areas of fog. Fog today will be primarily concentrated off the south coast and south of CAPE cod and around the islands. Most should diminish during the mid-day, but some areas will persist. The fog will redevelop Saturday night, and is expected to stretch even up the east coast of ma. Once again on Sunday, some fog will persist much of the day offshore. Visibilities will be reduced to less than 1 mile in the fog. Winds and seas aren't expected to be much of an issue. Potential for a bump up in wave heights late this weekend and into next week as we may see a short period southerly swell develop due to several weak low pressure systems develop off the north carolina coast and move out to sea. Outlook Sunday night through Wednesday ... Moderate confidence. Sunday night through Monday: winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers. Patchy fog. Monday night: winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers. Tuesday through Tuesday night: winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers with isolated thunderstorms. Wednesday: winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers with isolated thunderstorms. Box watches warnings advisories Ct... None. Ma... None. Ri... None. Marine... None. Synopsis... Belk nash near term... Belk nash short term... Nash long term... Belk aviation... Belk nash marine... Belk nash |
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 | 73 min | 66°F | 1018.7 hPa (+0.4) | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 17 mi | 83 min | SE 5.8 G 7.8 | 66°F | 67°F | 2 ft | 1017.8 hPa (+0.3) | 66°F |
| 44029 - Buoy A0102 - Mass. Bay/Stellwagen | 21 mi | 129 min | SSE 5.8 G 7.8 | 66°F | 66°F | 2 ft | 1018.3 hPa | |
| IOSN3 - Isle of Shoals, NH | 40 mi | 73 min | SE 11 G 11 | 64°F | 1018.1 hPa (+0.0) | 64°F | ||
| BGXN3 - Great Bay Reserve, NH | 43 mi | 88 min | ESE 1.9 | 67°F | 1019 hPa | 65°F | ||
| 44018 - SE Cape Cod 30NM East of Nantucket, MA | 45 mi | 83 min | SE 9.7 G 12 | 64°F | 2 ft | 1018.7 hPa (+0.0) | 64°F | |
| 44073 | 45 mi | 129 min | SE 5.8 G 7.8 | 64°F | ||||
| CMLN3 | 45 mi | 189 min | SE 7 | 63°F | ||||
| 44098 - Jeffrey's Ledge, NH (160) | 48 mi | 65 min | 65°F | 2 ft |
Wind History for Providence, RI
(wind in knots) EDIT (on/off) Help| 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 | 6 AM | 7 AM | 8 AM | 9 AM | |
| Last 24hr | S | SW | S | S | S G7 | S G12 | S G14 | S G17 | S | SW G14 | S G13 | S G10 | S G10 | S | S G11 | S G13 | SW G9 | SW | S | S | SE | SE | S | SE |
| 1 day ago | E | E | E G6 | S | S G6 | S G10 | S G10 | S G13 | S G16 | S G11 | S | S | S G11 | SE | SE | E | E | E G6 | E | NE | E | E | SE | SE G6 |
| 2 days ago | E | E G12 | E | E | E | -- | E | E | NE | NE | NE | NE | NE G6 | E | NE | NE |
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 |
| Boston, Logan International Airport, MA | 6 mi | 79 min | ESE 8 | 0.50 mi | Fog/Mist | 68°F | 64°F | 90% | 1018.4 hPa |
| Beverly, Beverly Municipal Airport, MA | 10 mi | 80 min | SE 6 | 2.50 mi | Fog/Mist | 67°F | 64°F | 93% | 1017.8 hPa |
| East Milton, MA | 18 mi | 77 min | N 0 | mi | 67°F | 66°F | 100% | 1019.3 hPa | |
| Laurence G Hanscom Field Airport, MA | 19 mi | 77 min | SSE 4 | 10.00 mi | Overcast | 73°F | 66°F | 79% | 1018.9 hPa |
| Norwood, Norwood Memorial Airport, MA | 21 mi | 80 min | S 3 | 10.00 mi | Overcast | 73°F | 66°F | 81% | 1018.2 hPa |
| Lawrence Municipal Airport, MA | 22 mi | 79 min | SE 3 | 10.00 mi | Overcast | 69°F | 64°F | 87% | 1018.9 hPa |
Link to 5 minute data for KBOS
Wind History from BOS (wind in knots)
| 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 | 6 AM | 7 AM | 8 AM | 9 AM | |
| Last 24hr | SE | SE | E | E | E | E | E | E | E | E | E | E | SE | Calm | SE | SE | SE | E | SE | SE | E | E | SE | SE |
| 1 day ago | NE | E | SE | SE | SE | E | E | E | E | E | E | E | E | SE | Calm | Calm | Calm | Calm | Calm | NW | NE | NE | E | E |
| 2 days ago | N | NE | NE | E | NE | E | E | E | E | SE | SE | SE | E | NE | E | Calm | Calm | NE | NE | Calm | Calm | SE | E | E |
Tide / Current Tables for Nahant, Massachusetts
EDIT Weekend mode (on/off) (on/off) Help One Week of DataNahant
Click for Map
Sat -- 01:00 AM EDT 9.64 feet High Tide
Sat -- 05:52 AM EDT Sunrise
Sat -- 07:15 AM EDT 0.20 feet Low Tide
Sat -- 07:39 AM EDT Moonset
Sat -- 01:29 PM EDT 8.86 feet High Tide
Sat -- 07:25 PM EDT 0.76 feet Low Tide
Sat -- 07:42 PM EDT Sunset
Sat -- 09:06 PM EDT Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 01:00 AM EDT 9.64 feet High Tide
Sat -- 05:52 AM EDT Sunrise
Sat -- 07:15 AM EDT 0.20 feet Low Tide
Sat -- 07:39 AM EDT Moonset
Sat -- 01:29 PM EDT 8.86 feet High Tide
Sat -- 07:25 PM EDT 0.76 feet Low Tide
Sat -- 07:42 PM EDT Sunset
Sat -- 09:06 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 |
| 9 | 9.6 | 9.1 | 7.7 | 5.7 | 3.4 | 1.3 | 0.2 | 0.6 | 1.8 | 3.6 | 5.7 | 7.6 | 8.7 | 8.7 | 7.7 | 6.1 | 4.1 | 2.2 | 0.9 | 1 | 2.2 | 3.9 | 6 |
Tide / Current Tables for Boston Harbor, Massachusetts Current
EDIT (on/off) Help One Week of DataBoston Harbor
Click for Map
Sat -- 12:40 AM EDT -0.00 knots Slack
Sat -- 05:05 AM EDT -1.22 knots Max Ebb
Sat -- 05:52 AM EDT Sunrise
Sat -- 07:12 AM EDT 0.00 knots Slack
Sat -- 07:39 AM EDT Moonset
Sat -- 10:31 AM EDT 1.13 knots Max Flood
Sat -- 01:07 PM EDT -0.00 knots Slack
Sat -- 05:28 PM EDT -1.12 knots Max Ebb
Sat -- 07:33 PM EDT 0.00 knots Slack
Sat -- 07:42 PM EDT Sunset
Sat -- 09:06 PM EDT Moonrise
Sat -- 10:44 PM EDT 1.06 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Sat -- 12:40 AM EDT -0.00 knots Slack
Sat -- 05:05 AM EDT -1.22 knots Max Ebb
Sat -- 05:52 AM EDT Sunrise
Sat -- 07:12 AM EDT 0.00 knots Slack
Sat -- 07:39 AM EDT Moonset
Sat -- 10:31 AM EDT 1.13 knots Max Flood
Sat -- 01:07 PM EDT -0.00 knots Slack
Sat -- 05:28 PM EDT -1.12 knots Max Ebb
Sat -- 07:33 PM EDT 0.00 knots Slack
Sat -- 07:42 PM EDT Sunset
Sat -- 09:06 PM EDT Moonrise
Sat -- 10:44 PM EDT 1.06 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 |
| 0.4 | -0.2 | -0.6 | -0.9 | -1.1 | -1.2 | -1 | -0.2 | 0.6 | 1 | 1.1 | 1.1 | 0.7 | 0.1 | -0.4 | -0.7 | -1 | -1.1 | -1.1 | -0.5 | 0.4 | 0.9 | 1 | 1 |
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 (9,2,3,4)
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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. |