Wednesday, December11, 2019
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Marine Weather and Tides
Brewster, MA

Version 3.4
NOTICE
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.
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 6:56AMSunset 4:12PM Wednesday December 11, 2019 7:14 AM EST (12:14 UTC) Moonrise 4:59PMMoonset 7:08AM Illumination 100% Phase: Full Moon; Moon at 14 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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ANZ231 Cape Cod Bay- 315 Am Est Wed Dec 11 2019
.small craft advisory in effect from this evening through Thursday morning...
Today..NW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt this afternoon. Seas 2 to 3 ft. Snow, mainly this morning. Vsby 1 nm or less, increasing to 1 to 3 nm this afternoon.
Tonight..W winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Gusts up to 30 kt. Seas 2 to 4 ft.
Thu..NW winds 15 to 20 kt with gusts up to 30 kt, diminishing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft.
Thu night..SW winds around 5 kt, becoming S after midnight. Seas 1 foot or less.
Fri..SE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.
Fri night..SE winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt after midnight. Seas 2 to 4 ft. Rain. Vsby 1 to 3 nm.
Sat..S winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 5 ft. Patchy fog. Rain. Vsby 1 to 3 nm.
Sat night..SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Showers likely.
Sun and Sun night..W winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 6 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 315 Am Est Wed Dec 11 2019
Synopsis for massachusetts and rhode island coastal waters.. A secondary cold front will cross the waters this evening. This will be followed by large high pres building over the waters on Thu. The high will move off the coast on Fri as low pres approaches from the southwest Fri night and moves across the waters on Sat. High pres builds over the waters by Monday. 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
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location: 41.77, -70.08     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 111053 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 553 AM EST Wed Dec 11 2019

SYNOPSIS.

Rain changing to a period of moderate to even briefly heavy snow will make for a difficult morning commute across much of the region. Snow is pretty much over by lunchtime, but a reinforcing cold front will bring dry but even colder weather tonight. Large high pressure will bring cold and dry conditions Thursday and Friday. Developing low pressure across the southeast U.S. will shift up the coast with the potential for periods of heavy rain Friday night into Saturday, possibly beginning as a period of light snow across interior Massachusetts. Drier and cooler weather returns Sunday into Monday. Another storm may impact the region Monday night into Tuesday with snow or rain.

NEAR TERM /UNTIL 1 PM THIS AFTERNOON/.

550 AM Update .

* Snow this morning resulting in a messy morning commute

* Snow ends from west to east by lunchtime, except may linger into early afternoon across the Cape/Nantucket

We have received numerous reports of 3 to 4 inches of snow early this morning across portions of CT and into the Worcester Hills. May see some localized 5" amounts, but the back edge of the snow is near Bradley to Fitchburg. So while the bulk of the accumulating snow will be ending across the interior shortly, several more hours of snow will occur across RI into eastern MA so roads will be deteriorating in this region. Lingering rain across the Cape/Islands will be changing to snow over the next few hours.

Previous Forecast Discussion .

Impressive jet dynamics with southern New England being the right rear quad of a 180 knot jet streak. The result in strong FGEN developing in the 600 mb to 700 mb layers of the atmosphere as a result of the anafrontal wave. There is also impressive snowgrowth with the NAM indicating the potential for over 20 units of omega for portions of the region.

Rain is already changing to snow just northwest of the Boston to Providence corridor and this transition should push southeast across the rest of the region by daybreak. Perhaps a tad later across portions of the Cape/Nantucket.

As is always the case with anafrontal waves, the northwest extent and duration of steady snow is always difficult because of drying WNW just off the deck. However, given strong FGEN and favorable snowgrowth the potential for 1 inch per hour snowfall rates in any banding. Unfortunately, this looks to coincide with the morning rush hour.

Overall, it still looks like a general 1 to 4 inch snowfall for much of the region. We can not rule out a few 5 inch totals if any localized bands can persist. It is also possible that parts of western MA receive just a coating to an inch. While specific snow accumulations will be determined by banding, the main concern revolves around timing. Snow looks to be falling across most of our metro areas during the morning rush hour. These type of events can often be problematic, so winter weather advisories are posted for northern CT/RI, as well as central and eastern MA.

Appears the threat for accumulating snow will end across interior MA/CT by late morning, the Boston to Providence corridor around noon, and the Cape/Islands by early afternoon.

SHORT TERM /1 PM THIS AFTERNOON THROUGH 6 AM THURSDAY/.

This afternoon .

Any remaining snow should exit the Cape/Nantucket by early afternoon. Otherwise, skies become partly to mostly sunny with afternoon temperatures mainly in the lower to middle 30s. We can not rule out a brief flurry or two toward evening in the Berks with a reinforcing cold front.

Tonight .

Reinforcing cold front crosses the region this evening. While this front comes through day other than perhaps a brief flurry in Berks, it will become quite cold. Low temps will bottom out mainly in the upper teens and lower 20s by daybreak. Wind chills will be in the high single digits to lower teens.

LONG TERM /THURSDAY THROUGH TUESDAY/. Highlights .

* Dry and cold conditions Thursday

* Southern stream system works up the coast Friday through Saturday, bringing milder temperatures and the potential for heavy rain & localized flooding especially late Friday night and Saturday. Melting snow may increase flood risks. * Leftover rain/snow showers linger into early Sunday. Drying out and seasonably cold on Monday before next system arrives on Tuesday. Details .

Thursday .

Will see dry conditions as high pressure moves east out of NY/PA during the day. NW winds will gust up to 20-25 early, which will combine with the cold early morning temps to produce wind chills in the single digits to the mid teens early. However, as the high approaches and pressure gradient relaxes, winds will diminish through the rest of the day. Still noting a rather deep cold layer aloft, so it will be a chilly day. Temperatures will only reach the mid to upper 20s well inland to the mid 30s along the S coast.

The center of the cold high will shift across the region Thu evening, then push toward Maine and the Maritimes around or after midnight which will allow light/variable winds to shift to S-SE. Clouds will start to increase N of the Mass Pike after midnight. It will remain cold as temps bottom out in the teens to near 20, except up to the mid 20s to near 30 along the immediate coast.

Friday through Saturday night .

***Heavy Rain and Flood Potential***

Low pressure will push out of the Gulf of Mexico early Friday, moving NE across the east coastal states before pushing across the region during this timeframe. This will bring a slug of tropical moisture up the coast, with PWATs up to 2-3 SD above normal by 12Z Saturday. Medium range models all in good agreement in bringing milder temperatures on S-SW winds as well as the increasing moisture.

Will see precip to start during the morning with most areas receiving all rain. May see some colder air trapped in the colder inland valleys, so may see a mix of rain/snow or all snow to start. With the SW winds, though, milder air will work northward and scour out by midday or early afternoon.

00Z models all signaling the heaviest rain to occur from late Friday night through Saturday, with upwards to 1 to 1.6 inches. As the low moves across coastal areas early Saturday, some colder air may wrap back in across N central/NW Mass, so could still see some mixed rain/snow then.

Main concern will be the heavy rainfall especially across central and southern areas along with any additional influx of runoff from the melting snow from this event. Could see some rising river levels as well as localized urban and poor drainage flooding on roadways.

Expect highs on Saturday will range from the mid to upper 40s across N central and western areas to the mid-upper 50s along the coast.

Saturday night through Tuesday .

Scattered showers will linger early Sat night across the region then, as temps start to fall across the higher terrain, may see a mix of rain and snow before the precip ends Sunday morning.

As the low deepens across the Maritimes Sunday, expect strong W-NW winds especially across E MA and along the coast. Gusts up to 20-25 kt forecast across the higher inland terrain, but could be up to 30-40 kt along the immediate coast and especially across Cape Cod and the islands Sunday and Sunday night. If this trend continues, may need wind headlines along the coast as well as across the coastal waters.

Will see another surge of cold air moving in late Sunday night and Monday with continued gusty winds through midday along with temperatures running around 5 degrees or so below normal.

Yet another southern stream low may approach the region Monday night and Tuesday with another shot of deep moisture moving across. At this point, could see another round of snow that could mix with or change to rain, but some question whether the colder air may hang in longer across the interior. Low forecast confidence continues with this event.

AVIATION /12Z WEDNESDAY THROUGH SUNDAY/. Forecaster Confidence Levels .

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

Short Term /through Tonight/ .

Today . Moderate to high confidence. Rain changes to snow from northwest to southeast through 11z, but may be an hour or two later across portions of the Cape/Islands. Snow will result in IFR conditions this morning with perhaps brief LIFR conditions. Snow should end in the BDL/ORH/BED areas between 12z and 14z, BOS/PVD between 14 and 16z and the Cape/Nantucket by 18z or 19z. 1 to 3inches of accumulations is likely on paved runways. Once the snow ends, expect conditions to quickly improve to VFR.

Tonight . High confidence. VFR with NW wind gusts of 20 to 25 knots.

KBOS Terminal . Moderate to high confidence. Snow impacts the morning push with IFR to brief LIFR conditions.

KBDL Terminal . Moderate to high confidence. Snow impacts the morning push with IFR to brief LIFR conditions.

Outlook /Thursday through Sunday/ .

Thursday: VFR. Breezy.

Thursday Night: VFR.

Friday: Mainly MVFR, with local IFR possible. Breezy. Slight chance RA, patchy BR.

Friday Night: Mainly IFR, with areas MVFR possible. Windy with areas of gusts up to 30 kt. RA, patchy BR.

Saturday: Mainly IFR, with areas MVFR possible. Windy with gusts up to 35 kt. RA, patchy BR.

Saturday Night: Mainly MVFR, with local IFR possible. Breezy. Chance SHRA.

Sunday: Mainly VFR, with areas MVFR possible. Windy with gusts up to 35 kt. Slight chance SHRA.

MARINE. Short Term /through Tonight/ .

Today . High confidence. NW wind gusts of 20 to 25 kts over the open waters early this morning diminish a bit later this morning and afternoon. Rain changing to snow will also result in reduced vsbys for mariners this morning into the early afternoon across our southeast waters. Seas will remain rough.

Tonight . High confidence. A reinforcing cold front will result in excelling mixing over the relatively mild ocean. Westerly wind gusts of 30 to 35 knots will develop over the open waters. Opted to go with gales across our eastern waters and strong SCA elsewhere.

Outlook /Thursday through Sunday/ .

Thursday: Low risk for Small Craft Advisory winds with local gusts up to 30 kt. Local rough seas.

Thursday Night: Winds less than 25 kt.

Friday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas locally approaching 5 ft. Slight chance of rain.

Friday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Rain likely. Local visibility 1 to 3 nm.

Saturday: Low risk for gale force winds with gusts up to 35 kt. Rough seas up to 11 ft. Rain, patchy fog. Local visibility 1 to 3 nm.

Saturday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 12 ft. Chance of rain showers.

Sunday: Moderate risk for gale force winds with gusts up to 40 kt. Rough seas up to 12 ft. Slight chance of rain showers.

BOX WATCHES/WARNINGS/ADVISORIES. CT . Winter Weather Advisory until noon EST today for CTZ002>004. MA . Winter Weather Advisory until noon EST today for MAZ012-013- 015>023. Winter Weather Advisory until 10 AM EST this morning for MAZ004>007-014-026. RI . Winter Weather Advisory until noon EST today for RIZ001>007. MARINE . Small Craft Advisory from 7 PM this evening to 10 AM EST Thursday for ANZ231>234. Small Craft Advisory from 7 PM this evening to 4 AM EST Thursday for ANZ230-236. Small Craft Advisory until 11 AM EST Thursday for ANZ235-237- 255-256. Gale Warning from 11 PM this evening to 7 AM EST Thursday for ANZ250-251-254.

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


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 14 mi44 min 46°F6 ft
44020 - NANTUCKET SOUND 22 mi54 min 19 G 25 43°F1021 hPa
WAXM3 - Waquoit Bay Reserve, MA 27 mi89 min WNW 4.1 42°F 1021 hPa42°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 30 mi84 min NW 21 G 25 34°F 5 ft1020.9 hPa (+2.9)31°F
NTKM3 - 8449130 - Nantucket Island, MA 34 mi56 min N 15 G 21 37°F 45°F1021.5 hPa
BZBM3 - 8447930 - Woods Hole, MA 36 mi62 min 33°F 43°F1021.4 hPa

Wind History for Nantucket Island, MA
(wind in knots)    EDIT      (on/off)   Help
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA7 mi22 minN 610.00 miOvercast34°F32°F92%1021.7 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA12 mi78 minNNW 13 G 217.00 miLight Snow35°F30°F85%1021 hPa
Provincetown Municipal Airport, MA18 mi18 minNNW 142.00 miLight Snow Fog/Mist32°F30°F96%1022.2 hPa

Link to 5 minute data for KCQX

Wind History from CQX (wind in knots)
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Tide / Current Tables for Sesuit Harbor, East Dennis, Cape Cod Bay, Massachusetts
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Wed -- 02:07 AM EST     0.00 knots Slack
Wed -- 05:27 AM EST     1.90 knots Max Flood
Wed -- 06:07 AM EST     Moonset
Wed -- 06:56 AM EST     Sunrise
Wed -- 08:31 AM EST     -0.00 knots Slack
Wed -- 11:15 AM EST     -1.86 knots Max Ebb
Wed -- 02:24 PM EST     0.00 knots Slack
Wed -- 03:59 PM EST     Moonrise
Wed -- 04:09 PM EST     Sunset
Wed -- 05:50 PM EST     2.13 knots Max Flood
Wed -- 09:04 PM EST     -0.00 knots Slack
Wed -- 11:41 PM EST     -1.75 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-1.5-1-0.10.81.51.91.81.40.6-0.5-1.4-1.8-1.7-1.2-0.40.61.522.11.91.20.1-1-1.6

Weather Map
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wmap_A
GEOS 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.
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Wind Forecast for Boston, MA (7,2,3,4)
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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 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.