Tuesday, December10, 2019
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Marine Weather and Tides
Yarmouth Port, 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 6:55AMSunset 4:12PM Tuesday December 10, 2019 12:36 AM EST (05:36 UTC) Moonrise 4:21PMMoonset 6:04AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 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- 923 Pm Est Mon Dec 9 2019
.gale warning in effect until 9 am est Tuesday...
Overnight..S winds 15 to 20 kt with gusts up to 35 kt. Seas 3 to 5 ft. Patchy fog. Showers. Vsby 1 nm or less, increasing to 1 to 3 nm.
Tue..SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Patchy fog. Showers likely. Vsby 1 to 3 nm.
Tue night..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Rain and sleet likely. Vsby 1 to 3 nm.
Wed..NW winds 5 to 10 kt. Seas around 2 ft. Snow likely. Vsby 1 nm or less.
Wed night..W winds 10 to 15 kt, becoming nw 15 to 20 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 3 to 5 ft.
Thu night..N winds 5 to 10 kt, becoming ne after midnight. Seas around 2 ft.
Fri..SE winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers.
Fri night and Sat..SE winds 10 to 15 kt, increasing to 15 to 20 kt. Gusts up to 25 kt. Seas 4 to 6 ft. Showers likely. Vsby 1 to 3 nm.
Sat night..SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. 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 923 Pm Est Mon Dec 9 2019
Synopsis for massachusetts and rhode island coastal waters.. A slow moving cold front will approach southern new england Tue and cross the waters Tue night and Wed. High pres will build into the region from the great lakes Thu and Fri. Low pressure will move up the eastern seaboard Saturday. 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 Yarmouth Port, MA
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location: 41.71, -70.29     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 100237 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 937 PM EST Mon Dec 9 2019

SYNOPSIS.

A milder airmass will continue to surge northward across the region and will be accompanied by showers into Tuesday. The rain will be heavy at times. A cold front moves through Tuesday evening, ushering in much colder air that will likely change rain to snow and linger into Wednesday with accumulations likely. Large high pressure will bring cold and dry conditions Thursday and Friday. Another system will impact the region Saturday with potentially periods of heavy rain, possibly beginning as freezing rain over northwest Massachusetts. A trend toward drier and cooler weather is scheduled for Sunday.

NEAR TERM /UNTIL 6 AM TUESDAY MORNING/.

* Rain diminishes in intensity and areal coverage from west to east after midnight, but it remains unseasonably mild

935 PM Update .

Widespread rain impacting the region this evening, but the heaviest rain was across RI/SE MA on the nose of a strong southerly LLJ of 60 to 80 knots. Some nuisance poor drainage street flooding likely, but no significant flooding issues expected. Southerly 30 to 40 mph wind gusts are mixing down along the southeast New England coast, but inversion should be enough to keep things mainly below wind advisory criteria except for perhaps a few spot locations.

The shortwave and core of the LLJ moves offshore after midnight. Therefore, expect the rain to diminish in areal coverage and intensity after midnight from west to east. In fact, most locations should be dry by daybreak with just a few spot showers. Temperatures will remain unseasonably mild as we remain in the warm sector and in southwest flow. Temps should hold in the 50s through daybreak in most locales, with even a few locales near 60 across RI/SE MA. Patchy fog will remain possible especially over the rapidly melting snowpack across the interior. However, enough wind in the boundary layer should prevent widespread dense fog.

SHORT TERM /6 AM TUESDAY MORNING THROUGH 6 PM TUESDAY/. A cold front is anticipated to move across southern New England during the afternoon hours. This front will provide an additional focus for rainfall. Expecting another round of showers to develop from mid morning into the afternoon hours. Low level convergence will not be ideal. Precipitable water will also remain above normal, but not exceptionally above normal. Overall, looks like an efficient rainfall situation. There simply should not be a lot of rainfall.

Our region will spend most of the day in the warm sector. Despite the clouds, max temperatures generally in the 50s are expected. A few locations could make a run at 60 degrees. Some locations across the higher terrain of the Worcester Hills and east slopes of the Berkshires should remain closer to around 50 degrees.

LONG TERM /TUESDAY NIGHT THROUGH MONDAY/. Highlights .

* Rain changing to snow Tue night/Wed with accumulating snow likely * Colder than normal Thu into Fri but dry except possible ocean effect snow showers outer Cape Cod

* Another weather system Sat with heavy rain & potential flooding Details .

Tuesday night and Wednesday .

*** Accumulating Snow Possible Wed Morning Commute ***

Cold front pushes offshore with shallow cold air overspreading the region and becoming deeper as the night progresses. Strong short wave approaching the Great Lakes maintains southwest flow aloft across New England, thus warm air overrunning cold air at the surface setting the stage for another precip event. All guidance indicates the column is cold enough to support all snow especially after midnight. The question then becomes how much qpf will overrun the boundary into the cold air across southern New England?

Both ensemble data sets from the EC and GFS including deterministic guidance from the NAM/HREF/GFS/EC suggest heaviest qpf will be confined to the south coast of MA/RI/CT. Ensembles offering 0.25 to 0.33 in this area and obviously deterministic guidance higher with 12z NAM showing a stripe of 0.75+ inches from Cape Cod to MVY. 12z HREF ends 12z Wed but also has some members supporting higher qpf 06z-12z Wed. In fact the 12z ECENS has over 30 of its 50 members supporting at least 2 inches of snow for much CT/RI and MA!

At this model time range (42+ hrs) typical model error for a frontal boundary is probably in the +/- 50-100 miles range. Thus this heavier qpf band could shift and verify offshore but also could shift inland to perhaps HFD-ORH-BOS. So there remains a range of possibilities. Tracing back the short wave that will enter the Great Lakes early Wed that will back the mid level flow across southern New England and impact our forecast, this feature traces back to the Arctic circle this afternoon. Obviously this is a data sparse area so expecting models to initialize this feature differently/better once it reaches lower latitudes with more data. Typically these arctic short waves verify stronger/more robust given poor model initialization at higher latitudes in data sparse regions. In addition this approaching arctic short wave will be accompanied by an anomalous upper level jet streak across northern New England into southern Quebec Tue ngt/Wed with speeds of 180+ kts! Thus a lot of jet dynamics to watch unfold.

So at this early stage our preliminary snowfall forecast could range as little as a coating to an inch (our 10% percentile snow forecast) to possibly 2-4 inches (50% percentile snow forecast) if arctic short wave verifies stronger with mid level flow backing more to the SSW and with longer duration yielding higher qpf. Also can't completely dismiss the more extreme NAM/HREF solution with 4+ inches, albeit a low prob but within the envelope of solutions. Nevertheless will need to watch this portion of the forecast given its potential impact to the Wed morning commute.

Wednesday night through Friday .

As you would expect pretty cold airmass overspreads the region Wed night into Thu behind departing Arctic short wave. By 12z Thu 925 mb temps fall to about -13C over southern New England and 850 temps down to -20C upstream over northern VT/NH! However mainly dry weather prevails as 1040+ mb Arctic high builds into the region. Gusty NW winds will provide frigid wind chills Wed night but by Thu afternoon gradient relaxes so diminishing winds later Thu into Fri. However before this occurs low level winds turn to the NNW and may yield ocean effect snow showers for the outer Cape and Nantucket Thu/Thu evening. Otherwise dry but cold weather prevails. Given the magnitude of the cold air (-1 to -2 STD) will derive temps from a 50/50 blend of the coldest guidance and Superblend.

Next Weekend .

*** Heavy Rain & Flood Potential ***

Another potent system appears to impact the region Saturday with ensembles showing PWAT anomalies of +1 to +2 STD. Thus heavy rain threat and given heavy rain from today and tomorrow along with snow melt contribution, increased risk for river and urban flooding Saturday. Shallow cold air may linger across the CT river valley of western MA and may result in freezing rain/wintry mix at the onset Friday night.

Ensembles suggest pattern remains progressive so some improvement possible Sunday with a drying trend and cooler weather.

AVIATION /03Z TUESDAY THROUGH SATURDAY/. Forecaster Confidence Levels .

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

Short Term /through Tuesday/ . High confidence.

00z update .

No major changes from previous TAFs. Now that warm air has overspread the region, cigs and vsbys have improved somewhat and expect IFR/MVFR to dominate the terminals. Thus no longer expecting LIFR overnight. Earlier discussion below.

==================================================================

Mainly MVFR CIGS/VFR VSBYS well inland with local VFR conditions across N Mass. Farther S, mix of VFR-MVFR conditions at most sites, except IFR-LIFR across portions N CT into S central Mass. Expect lowest conditions across N central/NW Mass with deep snowpack in place.

IFR-LIFR conditions will continue early tonight, then VSBYS may slowly improve as SW winds will increase overnight. CIGS will remain low.

Scattered -SHRA linger across region Tue with MVFR-IFR CIGS and areas of MVFR-IFR VSBYS mainly along S coast.

LLWS continues due to light winds at surface and 2kft winds 19040kt. Later today and tonight, focus of LLWS shifts into RI and eastern MA as southerly low level jet increases to 50-60kt at 2kft.

KBOS Terminal . High confidence in TAF trends. Moderate confidence in timing.

KBDL Terminal . High confidence in TAF trends. Moderate confidence in timing.

Outlook /Tuesday Night through Saturday/ .

Tuesday Night: MVFR/IFR conditions possible. Breezy. PL likely, chance RA, chance SN, FZRA likely.

Wednesday: Mainly VFR, with local IFR possible. Chance SN.

Wednesday Night: VFR. Windy with local gusts up to 35 kt.

Thursday: VFR. Windy with local gusts up to 30 kt.

Thursday Night: VFR.

Friday: MVFR/IFR conditions possible. Breezy. Chance SHSN, chance SHRA.

Friday Night: Mainly IFR, with areas MVFR possible. Breezy. SHRA likely, SHSN likely, FZRA likely.

Saturday: Mainly MVFR, with areas IFR possible. Breezy. SHRA likely.

MARINE. Short Term /through Tuesday/ . High confidence.

** Gale Warnings for most of waters through Tue morning **

Increasing S-SW winds into tonight. Gale force gusts this afternoon and tonight, with peak gusts of 35-40 kt expected. Gusty winds remain in place Tuesday. Expecting Gale Warnings to be gradually replaced by Small Craft Advisories Tuesday morning as conditions warrant.

Steadier showers continue into this evening. Patches of dense fog possible mainly on south coastal waters. More in way of scattered showers Tuesday morning before next round of steadier rainfall arrives later in the day. Expect poor visibility around 1 NM in the heavier showers.

Outlook /Tuesday Night through Saturday/ .

Tuesday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 10 ft. Rain likely, sleet likely.

Wednesday: Winds less than 25 kt. Local rough seas. Chance of snow, rain likely, sleet likely. Local visibility 1 nm or less.

Wednesday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas.

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. Areas of seas approaching 5 ft.

Friday: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain showers. Local visibility 1 to 3 nm.

Friday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Rain showers likely.

Saturday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 13 ft. Rain showers likely.

CLIMATE. Record highs for Tuesday 12/10. Best chance to tie or break record would likely be at Boston.

BOS . 64/1907 PVD . 67/1946 BDL . 67/1946 ORH . 63/1946

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Gale Warning until 9 AM EST Tuesday for ANZ231>235-237-250-251- 254>256. Small Craft Advisory until 1 PM EST Tuesday for ANZ230-236.

SYNOPSIS . Belk/Nocera NEAR TERM . Frank SHORT TERM . Belk LONG TERM . Nocera AVIATION . Belk/Nocera MARINE . Belk/Nocera CLIMATE . Staff


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44090 9 mi36 min 46°F4 ft
44020 - NANTUCKET SOUND 15 mi36 min 23 G 29 52°F 43°F1008.4 hPa (-2.5)51°F
WAXM3 - Waquoit Bay Reserve, MA 15 mi111 min SSE 8.9 58°F 1009 hPa57°F
BZBM3 - 8447930 - Woods Hole, MA 24 mi54 min 56°F 42°F1008.2 hPa
NTKM3 - 8449130 - Nantucket Island, MA 31 mi48 min S 12 G 23 56°F 41°F1009.3 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 35 mi46 min S 25 G 29 53°F 5 ft1005.7 hPa (-3.7)52°F
BUZM3 - Buzzards Bay, MA 45 mi36 min SSW 33 G 35 56°F 1006.8 hPa (-2.6)
FRVM3 - 8447386 - Fall River, MA 46 mi60 min 59°F 43°F1007.4 hPa
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 47 mi54 min SSW 29 G 35 56°F 1006.3 hPa
FRXM3 47 mi60 min 59°F 57°F
44013 - BOSTON 16 NM East of Boston, MA 48 mi46 min S 23 G 33 57°F 48°F4 ft1003.6 hPa (-4.1)56°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Hyannis, Barnstable Municipal-Boardman Airport, MA2 mi1.7 hrsS 17 G 233.00 miLight Rain Fog/Mist55°F52°F90%1008.3 hPa
Otis Air National Guard Base, MA13 mi51 minSW 24 G 353.00 miRain and Windy57°F57°F100%1007.8 hPa
Chatham, Chatham Municipal Airport, MA16 mi44 minSSW 12 G 241.25 miLight Rain Fog/Mist53°F53°F100%1008.6 hPa
Provincetown Municipal Airport, MA21 mi40 minSSW 19 G 253.00 miRain Fog/Mist and Breezy54°F54°F100%1006.8 hPa

Link to 5 minute data for KHYA

Wind History from HYA (wind in knots)
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1 day agoNW6W6W5W5NW5W4W5NW4W3S4SW7S6S7S10S10S9S9S10S10
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NW9NW7N8N6N5NW4NW66NW8W5NW8W6W6

Tide / Current Tables for Barnstable Harbor, Beach Point, Massachusetts
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Barnstable Harbor
Click for Map
Tue -- 03:50 AM EST     0.95 feet Low Tide
Tue -- 05:03 AM EST     Moonset
Tue -- 06:57 AM EST     Sunrise
Tue -- 09:45 AM EST     10.22 feet High Tide
Tue -- 03:21 PM EST     Moonrise
Tue -- 04:10 PM EST     Sunset
Tue -- 04:25 PM EST     0.13 feet Low Tide
Tue -- 10:17 PM EST     9.22 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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6.74.931.411.93.75.98.19.810.29.47.95.83.61.50.20.41.83.768.19.29

Tide / Current Tables for Cape Cod Canal, Massachusetts Current
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Cape Cod Canal
Click for Map
Tue -- 01:41 AM EST     0.02 knots Slack
Tue -- 04:45 AM EST     4.01 knots Max Flood
Tue -- 05:05 AM EST     Moonset
Tue -- 06:58 AM EST     Sunrise
Tue -- 08:03 AM EST     -0.03 knots Slack
Tue -- 10:56 AM EST     -4.39 knots Max Ebb
Tue -- 02:06 PM EST     0.19 knots Slack
Tue -- 03:22 PM EST     Moonrise
Tue -- 04:11 PM EST     Sunset
Tue -- 05:10 PM EST     4.15 knots Max Flood
Tue -- 08:33 PM EST     -0.20 knots Slack
Tue -- 11:19 PM EST     -4.29 knots Max Ebb
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-3.6-2.41.63.23.943.72.90.8-3-4.1-4.4-4-3.1-12.83.84.143.52.2-2.1-3.6-4.3

Weather Map
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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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Wind Forecast for Boston, MA (0,6,7,8)
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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.