Saturday, December7, 2019
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Marine Weather and Tides
Dennis 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 6:52AMSunset 4:11PM Saturday December 7, 2019 2:21 AM EST (07:21 UTC) Moonrise 2:55PMMoonset 2:57AM Illumination 78% Phase: Waxing Gibbous; Moon at 10 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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ANZ232 Nantucket Sound- 116 Am Est Sat Dec 7 2019
.small craft advisory in effect until 11 am est this morning...
Rest of tonight..NW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 3 ft.
Sat..NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 3 ft.
Sat night..NW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft.
Sun..W winds around 5 kt, becoming S with gusts up to 20 kt in the afternoon. Seas around 2 ft.
Sun night..S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft.
Mon..S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Showers likely.
Mon night..SW winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Showers.
Tue and Tue night..SW winds 20 to 25 kt, becoming W 15 to 20 kt. Gusts up to 30 kt. Seas 4 to 6 ft. Showers likely.
Wed..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers.
Wed night..NW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 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 116 Am Est Sat Dec 7 2019
Synopsis for massachusetts and rhode island coastal waters.. Large high pres builds over the waters tonight through Sat night. The high moves off the coast Sun as a slow moving cold front approaches from the west Mon into Tue. The cold front sweeps across the waters Tue night with a secondary cold front moving through Wed afternoon. High pres follows later on Wed through Fri. 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 Dennis Port, MA
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location: 41.65, -70.12     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 070641 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 141 AM EST Sat Dec 7 2019

SYNOPSIS. Clearing skies with colder, drier air moving across the region overnight with high pressure building in from the west. Many areas will have sub- freezing high temperatures on Saturday, followed by a frigid Saturday night. The high moves offshore Sunday, starting a return flow of milder and moist air for the first half of the week. This will bring off and on rain for Monday and Tuesday. A cold front moves through Tuesday night, and there might be some back-end snow on Wednesday although confidence is very low at this point. We dry out by late Wednesday and return to colder than normal temperatures for early December on Thursday.

NEAR TERM /UNTIL 6 AM THIS MORNING/. 140 AM update .

Skies were mostly clear across southern New England except for some clouds over outer Cape Cod and Nantucket and some low cloudiness banked along the higher terrain in western and central MA. Low pressure was centered off of Cape Cod with high pressure building eastward from the eastern Great Lakes region. The gradient between the two was still causing some gusty winds to 20-25 kt across the area. Temperatures were dropping off now, with 19 at Orange and 21 at Lawrence at 1 AM. But they were still in the lower 30s across CT, RI, and southeast MA. Overnight lows should reach the teens to lower 20s, with mid 20s to lower 30s Cape Cod and the Islands.

SHORT TERM /6 AM THIS MORNING THROUGH 6 AM SUNDAY/. Saturday colder and drier air pours into the region as high pressure builds in, though cyclonic flow lingers aloft. Subsidence under this high will keep things dry and skies mostly clear. Diurnal cumulus should develop given a cyclonic flow set up with cold air advection and daytime heating. Much of the area would see sub-freezing highs, with the interior higher elevations only reaching the upper 20s. Low to mid 30s near the coast. Albedo effect from snow cover would also negate daytime heating.

On Saturday night, a combination of light winds and mostly clear skies should allow temperatures to drop even more quickly than the previous night. A few locations in the interior higher elevations could even see single digit lows. Elsewhere, widespread teens are expected and 20s on the coast.

LONG TERM /SUNDAY THROUGH FRIDAY/. Highlights .

Cold start to Sunday before temperatures rebound during the day.

Rain spreads in early next week with temperatures trending upward. Potential for strong winds on Monday and Tuesday especially across eastern MA.

Temperatures trending downward on Wednesday and Thursday. Possibility of snow as precipitation is ending on Wednesday.

Daily Concerns .

Sunday .

Cyclonic flow initially with a mid level ridge building over the eastern Great Lakes. A trough will lift off to the northeast and the ridge will slide in over New England. This will bring clear skies and very light winds with the high overhead. Still have high confidence in strong radiational cooling. Knocked down temperatures toward the 25th percentile of guidance. Held off from the 10th percentile because it seemed too cold along the coastline given there may be some clouds exiting. Nudged down temperatures a bit further in the typical cold spots. Overnight lows range from the single digits above zero across the Berkshires and I-495 west corridor to the mid 20s across Cape Cod.

The ridge axis shifts off to the east on Sunday which shifts flow aloft to a southwesterly direction and advects warm air into the region. This will trend temperatures upward during the day. Expect partly to mostly sunny skies with highs ranging from the low 30s across northwest MA to the low 40s along the coast. High confidence in the forecast during this period.

Monday and Tuesday .

Pattern change underway with zonal flow shifting to a more amplified flow. Models have come into agreement with a northern and southern stream trough digging in from the west. The weaker southern stream trough will dig into the desert southwest on Monday while the northern trough digs into the Northern Plains and western Great Lakes. As the trough digs into the western Great Lakes several shortwaves will ripple along the central and eastern Great Lakes. This will provide lift along with a warm front and spread rain into the region. Still seeing a strong 40 to 70 kt low level jet develop. This continues through Tuesday with the low level jet shifting to the east. The GFS and ECMWF have come into good agreement, but still uncertain how much of these winds will translate to the surface. Did bump up speeds and gusts with gale force gusts anticipated across the coastal waters late on Monday into early Tuesday. If we tap more into the low level jet speeds then winds will need to be increased further. There will also be some instability present and suspect that there will be a few rumbles of thunder, but confidence in particular timing and placement is low at this time. It will be much warmer with high temperatures in the 50s on Monday and Tuesday. Suspect that there will be some 60 degree readings on Tuesday. Could see a good slug of precipitation with GEFS QPF still quite spread out with amounts between 0.75 to 3.0 inches when it is all said and done. Will be worth keeping an eye on for future updates. Low to moderate confidence in the forecast for this time frame.

Wednesday and Thursday .

Precipitation coming to an end on Wednesday. Overall there is pretty good agreement amongst guidance synoptically, but the ECWMF holds onto heavier precipitation longer than the GEM and GFS. If the ECMWF holds true there could be some snowfall accumulation, but confidence at this point in time is very low. Do have high confidence in the colder air moving in as the trough lifts to the northeast. Temperatures will be trending downward with readings in the low 30s across the west on Wednesday and in the low to mid 40s across the coast and east. Temperatures will be colder on Thursday with highs ranging from the mid 20s across the Berkshires and Worcester Hills to the low 30s along the coast. Moderate confidence in the cooler temperatures, but low confidence in weather expected on Wednesday.

AVIATION /07Z SATURDAY THROUGH WEDNESDAY/. Forecaster Confidence Levels .

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

Short Term /through Tonight/ . High confidence.

0640Z update .

Tonight . VFR except local MVFR over outer Cape Cod, Nantucket, and banked up against higher terrain of western and central MA. W-NW winds gusting to 20-25 kt at times, with up to 30 kt on Nantucket overnight, diminishing somewhat toward daybreak.

Saturday . VFR. Light NW winds.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF.

Outlook /Sunday through Wednesday/ .

Sunday: VFR. Breezy.

Sunday Night: Mainly VFR, with local MVFR possible. Windy with local gusts up to 30 kt. Slight chance SHRA.

Monday: Mainly MVFR, with areas IFR possible. Windy with local gusts up to 30 kt. SHRA likely.

Monday Night: Mainly MVFR, with areas IFR possible. Windy with gusts up to 35 kt. SHRA.

Tuesday: MVFR. Windy with gusts up to 30 kt. SHRA likely.

Tuesday Night: Mainly MVFR, with areas VFR possible. Breezy. Chance SHRA.

Wednesday: Mainly VFR, with areas MVFR possible. Breezy. Slight chance SHRA.

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

140 AM update .

Overnight . Gale Warnings have been discontinued over the southernmost outer waters and converted to Small Craft Advisories. NW winds gusting to 20-30 kt, slowly diminishing somewhat toward daybreak. Seas 3 to 5 ft except 6 to 9 ft on the southern outer waters.

Saturday . Clear skies and light winds. Seas 3 to 5 ft.

Outlook /Sunday through Wednesday/ .

Sunday: Winds less than 25 kt.

Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Seas up to 5 ft. Slight chance of rain showers.

Monday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Local rough seas. Rain showers likely.

Monday Night: Strong winds with gusts up to 35 kt. Rough seas up to 13 ft. Rain showers likely.

Tuesday: Strong winds with gusts up to 30 kt. Rough seas up to 13 ft. Rain showers likely.

Tuesday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 11 ft. Rain showers likely.

Wednesday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 10 ft. Chance of rain showers.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . Small Craft Advisory until 11 AM EST this morning for ANZ231>235-237-250-251. Small Craft Advisory until 4 AM EST early this morning for ANZ230-236. Small Craft Advisory until noon EST today for ANZ254>256.

SYNOPSIS . GAF/BL/Chai NEAR TERM . GAF SHORT TERM . Frank/Chai LONG TERM . BL AVIATION . BL/GAF MARINE . BL/Chai/GAF


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44020 - NANTUCKET SOUND 14 mi51 min 21 G 27 35°F 42°F28°F
44090 17 mi51 min 46°F5 ft
WAXM3 - Waquoit Bay Reserve, MA 22 mi96 min WNW 6 37°F 1018 hPa29°F
NTKM3 - 8449130 - Nantucket Island, MA 25 mi51 min NNW 12 G 19 35°F 41°F1018.6 hPa
BZBM3 - 8447930 - Woods Hole, MA 30 mi51 min 35°F 43°F1018.8 hPa
44018 - SE Cape Cod 30NM East of Nantucket, MA 38 mi31 min NW 23 G 27 35°F 5 ft1017.9 hPa (+3.4)26°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA8 mi29 minNNW 10 G 1710.00 miOvercast36°F27°F70%1018.5 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA9 mi25 minNW 15 G 2310.00 miOvercast35°F26°F70%1017.9 hPa
Otis Air National Guard Base, MA21 mi36 minNNW 10 G 1710.00 miPartly Cloudy30°F24°F80%1018.6 hPa

Link to 5 minute data for KCQX

Wind History from CQX (wind in knots)
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1 day agoW3NW3W334W34NW85
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2 days agoW3SW4SW4SW3SW7CalmCalmW3SW7SW5W9CalmCalmCalmCalmCalmCalmW3W3SW3CalmW3W5W4

Tide / Current Tables for Dennis Port, Nantucket Sound, Massachusetts
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Dennis Port
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Sat -- 01:45 AM EST     0.49 feet Low Tide
Sat -- 01:57 AM EST     Moonset
Sat -- 06:53 AM EST     Sunrise
Sat -- 08:30 AM EST     3.32 feet High Tide
Sat -- 01:54 PM EST     Moonrise
Sat -- 02:17 PM EST     0.49 feet Low Tide
Sat -- 04:09 PM EST     Sunset
Sat -- 08:53 PM EST     3.16 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.20.60.50.71.11.72.32.93.33.32.92.31.60.90.50.60.91.322.633.22.92.4

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Sat -- 01:56 AM EST     Moonset
Sat -- 02:43 AM EST     1.93 knots Max Flood
Sat -- 05:41 AM EST     -0.00 knots Slack
Sat -- 06:52 AM EST     Sunrise
Sat -- 08:33 AM EST     -1.65 knots Max Ebb
Sat -- 11:41 AM EST     0.00 knots Slack
Sat -- 01:54 PM EST     Moonrise
Sat -- 03:12 PM EST     1.89 knots Max Flood
Sat -- 04:09 PM EST     Sunset
Sat -- 06:08 PM EST     -0.00 knots Slack
Sat -- 08:54 PM EST     -1.55 knots Max Ebb
Sat -- 11:55 PM EST     0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.81.41.81.91.60.7-0.3-1.2-1.6-1.6-1.3-0.60.31.11.61.91.71.10.1-0.8-1.4-1.5-1.3-0.8

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
Wind Forecast for Boston, MA (2,6,7,8)
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Ground Weather Radar Station Boston, MA
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