Friday, December4, 2020
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Marine Weather and Tides
Rockport, MA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:55AMSunset 4:11PM Friday December 4, 2020 6:22 PM EST (23:22 UTC) Moonrise 8:57PMMoonset 11:38AM Illumination 77% Phase: Waning Gibbous; Moon at 20 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ251 Massachusetts Bay And Ipswich Bay- 416 Pm Est Fri Dec 4 2020
.storm warning in effect from Saturday afternoon through late Saturday night...
Tonight..SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. A chance of rain this evening, then rain after midnight.
Sat..NE winds 15 to 20 kt with gusts up to 30 kt, becoming N 25 to 30 kt with gusts up to 50 kt in the afternoon. Seas 6 to 9 ft. Rain. Vsby 1 nm or less.
Sat night..NW winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Gusts up to 50 kt. Seas 8 to 11 ft. Rain with a chance of snow. Vsby 1 nm or less.
Sun..NW winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 35 kt. Seas 4 to 7 ft.
Sun night and Mon..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft.
Mon night..N winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 4 ft.
Tue through Wed..W winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft.
Wed night..W winds around 10 kt. Seas 2 to 4 ft. 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 416 Pm Est Fri Dec 4 2020
Synopsis for massachusetts and rhode island coastal waters.. High moves offshore Fri with an increasing sw flow developing. A strong low pres will move up across new eng sometime Sat into Sat night then lifting to the north Sun, with a risk for gale force winds. Another low pressure system may pas southeast of the waters Tuesday. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo.


7 Day Forecast for Marine Location Near Rockport, MA
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location: 42.65, -70.62     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 042134 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 434 PM EST Fri Dec 4 2020

SYNOPSIS.

A strong storm system will impact the region Saturday into Saturday night bringing heavy rain and strong winds along the coast, with potential for heavy wet snow and power outages across the interior. The storm exits Sunday, then mainly dry and colder weather Monday and Tuesday with a moderating trend for the middle of next week.

NEAR TERM /UNTIL 6 AM SATURDAY MORNING/.

430 PM Update .

Moisture plume along with a band of low level forcing will lift northward into areas south of the MA Turnpike over the next several hours. The result will be light rain working into this region through mid evening.

By late evening and especially toward morning intensifying low pressure across the mid Atlantic states will be lifting northeast. This increases the forcing for ascent and widespread rain should overspread most of the region by daybreak. Low temps will mainly be in the upper 30s to lower 40s . but it will be a few degrees cooler in the high terrain.

SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/.

Highlights .

* Heavy Wet Snow with the potential for numerous power outages and tree damage in the high terrain of central MA

* Uncertainty exists in westward extent of heavy snow/power outage risk and Ptype issues across the coastal plain

* Strong Winds with Heavy Rain/Street Flooding expected near and southeast of the Boston to Providence corridor

Details .

Low pressure will undergo bombogenesis as it rapidly lifts northeast from the mid Atlantic and towards the Cape/Islands over the next 24 hours. The surface low drops over 30 mbs as it passes to our east at around 980 mb Saturday evening.

If we were dealing with a seasonably cold airmass a blockbuster snowstorm would be in the cards for the most of the region. In contrast, the current airmass in place is quite mild for this time of year with temperatures still in the 50s late this afternoon. That being said, the rapid intensification and strong dynamics of this system will allow for soundings to eventually become isothermal in some locations. As the mid level centers close off and track across the far southeast New England coast, very strong omega of 30 to 50 units will support heavy precipitation. The specific track coupled with very sensitive thermal profiles will make the difference between heavy rain and 1-2 inch per hour snowfall rates. We will break it down a bit more below by region.

Central MA .

Lets start off where confidence is highest and that is across central MA and especially the Worcester Hills. While rain should be falling Saturday morning, expect very strong dynamics to result in a change over to heavy wet snow during the mid to late morning hours. This will first occur in the highest terrain of central MA and then impact the rest of that region. Given the evolution of the storm and rapidly developing mid level centers, expect snowfall rates of 1 to 2 inches per hour once the transition occurs Unlike the late October snowstorm. 925T will only drop to between 0 and -2C. The result will be a heavy wet snow with temp on the order of 32/33 degrees. That is problematic because we are anticipating 6 to 12 inches of wet snow in this region with the greatest risk of seeing a foot of snow in the highest terrain. In fact, we can not rule out the low risk of 12 to 16 inches of snow. On the flip side of the coin, we want to be careful given marginal thermal profiles. If it ends up a little warmer we could up with more rain than expected and lower snowfall amounts than our current forecast reflects. But putting it all together, we are quite concerned for the potential for significant power outages and some downed trees if the heavy snow amounts are realized. Winter Storm Warnings have been posted for this region.

Western MA and northern CT .

Despite the event being less than 24 hours away, uncertainty remains larger than normal for western MA and CT. The 12z model suite has trended further west and also a bit milder than the earlier 00z runs. Across western MA and northern CT, the threat exists of rain changing to heavy wet snow but is dependent on track. If track shifts slightly back to the east, the bulk of the heavy snow would remain east of the CT River Valley. The limited amount of dynamics/intensity would also create Ptype issues especially in the lower elevations of the CT River valley. Based on the westward shift, we did opt to include Winter Storm Watches into Tolland and Windham counties for the potential of heavy wet snow of 6+ inches and scattered power outages. The 18z NAM and latest HRRR runs do show some concern for Hartford county too, so something will have to watch closely. We also left the remainder of western MA is the Watch as a small change in track will make a big difference. The 00z model runs this evening will shed more light on the situation.

Eastern MA/RI .

Finally, there is an unusual amount of uncertainty across eastern MA/RI inside 24 hours. While heavy precipitation is pretty much a lock, the westward shift in the 12z model guidance has resulted in a somewhat warmer solution. It probably will take until mid to late afternoon for rain to change to snow across this region. Still the potential for warning level snows in metrowest with snow accumulations into the Boston to Providence late Saturday into Saturday evening as well. Greatest concern for heavy wet snow and power outage risk will be across interior northeast MA, where a Winter Storm Watch remains in place. In fact, we can not rule out heavy snow/warning criteria in parts of northwest RI if the track shifts a bit east. Winter Weather Advisories may eventually need to be extended further southeast.

Heavy Rain/Strong Winds .

Ptype will mainly be rain near and especially southeast of the Boston to Providence corridor In fact. heavy rain on the order of 2 to 3 inches with some locally higher amounts may result in pockets of urban and poor drainage street flooding. If 3+ inch amounts are realized a few mainstem rivers and small streams may experience minor flooding. Lastly, a high wind warning has been issued for coastal Essex County as well as coastal Plymouth County, Cape Cod and the Islands. A very strong pressure rise/fall couplet in excess of 10 mb in 3 hours will bring NNW wind gusts of 50 to 60 mph late Sat into Sat evening. We may have to issue wind advisories further west for a period of 40 to 50 mph wind gusts.

LONG TERM /SUNDAY THROUGH FRIDAY/.

200 PM Update:

Fairly quiet weather expected through the period. We are watching another potential cutoff low from the Ohio Valley to the mid Atlantic states early next week, but with lack of downstream blocking this time (i.e., no ridging over Greenland) system is likely to pass well south of New England. Did include some chance PoPs near South Coast, Cape, and Islands but for most part expect this system to have little impact on SNE (as of right now, anyway). Upper flow turns more zonal for mid to late week which should allow for temperatures to moderate into 40s to around 50.

AVIATION /20Z FRIDAY THROUGH WEDNESDAY/.

Forecaster Confidence Levels .

Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.

Tonight through Saturday night . Moderate Confidence.

VFR will persist into the evening for much of the region, but some MVFR conditions may develop south of the Pike as an area of light rain begins to expand. Rain will have overspread most of the region by daybreak Saturday, which low end MVFR-IFR conditions dominating.

Biggest uncertainty will be how quickly the rain transitions to wet snow on Sat. We should see that occur during the morning across the Berks and Worcester Hills and then spread into much of the lower elevations during the afternoon . at least near and northwest of the Bos-Pvd corridor. A period of heavy wet snow likely for at least central and interior northeast MA, but may extend further west or into the I-95 corridor depending on the track. 1-2 inch per hour snowfall rates are likely in the heavy band. Therefore, we expect IFR to LIFR conditions to dominate Saturday. NNW wind gusts will increase to between 25 and 35 knots across the interior and 35 to 45 knots along the coastal plain late on Sat as the storm intensifies. Gusts up to 50 knots possible across Cape/Nantucket.

Precipitation will linger across eastern New England Saturday evening. We then should see improving conditions by late evening and especially after midnight with gradually diminishing winds.

KBOS TAF . Moderate confidence in the TAF.

KBDL TAF . Moderate confidence in the TAF.

Outlook /Sunday through Wednesday/ .

Sunday: VFR. Windy with gusts up to 35 kt.

Sunday Night: VFR. Breezy.

Monday: VFR.

Monday Night through Tuesday Night: VFR. Breezy.

Wednesday: VFR.

MARINE.

* Storm Warnings Saturday Afternoon and Evening

Tonight through Saturday night .

A significant Marine event will occur Saturday afternoon and night as low pressure undergoes bombogenesis and tracks across the Cape/Islands and moves NE from there. The strongest winds will be from the N and then NNW as the storm rapidly intensifies resulting in 45 to 50 knot wind gusts. Strong Gales are in effect across western sounds, Narr Bay and Boston Harbor with Storm Warnings for the rest of our waters. 15+ foot seas expected across our outer most waters.

Outlook /Sunday through Wednesday/ .

Sunday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 14 ft.

Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas.

Monday: Winds less than 25 kt. Areas of seas approaching 5 ft.

Monday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain.

Tuesday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of rough seas. Slight chance of rain.

Tuesday Night through Wednesday: Winds less than 25 kt. Local rough seas.

BOX WATCHES/WARNINGS/ADVISORIES. CT . Winter Storm Watch from Saturday morning through Sunday morning for CTZ003-004. MA . High Wind Warning from 1 PM Saturday to midnight EST Saturday night for MAZ007-019-022>024. Winter Storm Watch from Saturday morning through Sunday morning for MAZ002-003-005-006-008>011-014. Winter Storm Warning from 7 AM Saturday to 7 AM EST Sunday for MAZ004-012-026. RI . None. MARINE . Storm Warning from 1 PM Saturday to 3 AM EST Sunday for ANZ231>234-250-251-254>256. Gale Warning from 10 AM Saturday to 4 AM EST Sunday for ANZ230- 236. Gale Warning from 10 AM Saturday to 7 AM EST Sunday for ANZ235- 237.

SYNOPSIS . Frank/JWD NEAR TERM . Frank SHORT TERM . Frank LONG TERM . JWD AVIATION . Frank/JWD MARINE . Frank/JWD


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44029 - Buoy A0102 - Mass. Bay/Stellwagen 9 mi79 min SSW 14 G 16 52°F 1012.9 hPa
44013 - BOSTON 16 NM East of Boston, MA 21 mi33 min SSW 14 G 19 53°F 50°F3 ft1014.3 hPa44°F
IOSN3 - Isle of Shoals, NH 22 mi23 min SSW 20 G 21 51°F 1012.2 hPa (-0.8)37°F
44073 26 mi79 min S 5.8 G 7.8 51°F 47°F
44098 - Jeffrey's Ledge, NH (160) 26 mi57 min 49°F5 ft
BGXN3 - Great Bay Reserve, NH 30 mi98 min Calm 43°F 1013 hPa31°F
BHBM3 - 8443970 - Boston, MA 31 mi53 min 54°F 48°F
44030 - Buoy B0102 - Western Maine Shelf 38 mi79 min S 7.8 G 9.7 49°F 3 ft
44018 - SE Cape Cod 30NM East of Nantucket, MA 40 mi33 min SSW 18 G 21 53°F 52°F3 ft1014.5 hPa47°F
WELM1 - 8419317 - Wells, ME 46 mi53 min N 1.9 G 2.9 45°F 46°F
WEXM1 - Wells Reserve, ME 48 mi83 min SW 1.9 47°F 37°F

Wind History for Wells, ME
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Beverly, Beverly Municipal Airport, MA17 mi30 minSSW 910.00 miFair52°F36°F55%1012.6 hPa

Link to 5 minute data for KBVY

Wind History from BVY (wind in knots)
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Tide / Current Tables for Rockport, Massachusetts
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Rockport
Click for Map
Fri -- 01:19 AM EST     7.87 feet High Tide
Fri -- 06:56 AM EST     Sunrise
Fri -- 07:05 AM EST     1.24 feet Low Tide
Fri -- 10:37 AM EST     Moonset
Fri -- 01:18 PM EST     9.00 feet High Tide
Fri -- 04:09 PM EST     Sunset
Fri -- 07:43 PM EST     0.18 feet Low Tide
Fri -- 07:56 PM EST     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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7.17.87.76.75.23.31.81.21.62.84.66.58.28.98.87.75.93.81.70.50.20.92.34.2

Tide / Current Tables for Marblehead Channel, Massachusetts Current
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Marblehead Channel
Click for Map
Fri -- 02:09 AM EST     -0.00 knots Slack
Fri -- 05:02 AM EST     -0.30 knots Max Ebb
Fri -- 06:56 AM EST     Sunrise
Fri -- 08:42 AM EST     0.00 knots Slack
Fri -- 10:38 AM EST     Moonset
Fri -- 10:51 AM EST     0.43 knots Max Flood
Fri -- 02:24 PM EST     -0.00 knots Slack
Fri -- 04:10 PM EST     Sunset
Fri -- 05:26 PM EST     -0.36 knots Max Ebb
Fri -- 07:57 PM EST     Moonrise
Fri -- 09:15 PM EST     0.00 knots Slack
Fri -- 11:19 PM EST     0.41 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.20-0.2-0.3-0.3-0.3-0.2-0.10.10.30.40.40.30.1-0.1-0.3-0.3-0.3-0.3-0.2-0.10.20.4

Weather Map
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wmap_A
GEOS 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
Ground Weather Radar Station Boston, MA
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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 numerous 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.