Tuesday, January21, 2020
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Marine Weather and Tides
Madaket, MA

Version 3.4
NOTICE
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 7:04AMSunset 4:48PM Tuesday January 21, 2020 3:23 PM EST (20:23 UTC) Moonrise 5:14AMMoonset 2:54PM Illumination 12% Phase: Waning Crescent; Moon at 26 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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ANZ273 Expires:201912190045;;571877 Fzus71 Kbox 182339 Mwsbox Marine Weather Statement National Weather Service Boston/norton Ma 639 Pm Est Wed Dec 18 2019 Anz232-255-256-272-273-190045- 639 Pm Est Wed Dec 18 2019
.a strong snow squall approaching the waters... The areas affected include... Coastal waters extending out to 25 nm south of marthas vineyard and nantucket... Coastal waters from Montauk ny to marthas vineyard extending out to 20 nm south of block island... Nantucket sound... Ocean waters from marthas vineyard to nantucket from 25 to 45 nm offshore... Ocean waters from Montauk ny to marthas vineyard from 25 to 40 nm offshore... At 638 pm est, doppler radar indicated a strong snow squall, capable of producing winds to around 25 knots. This squall was located near the coastal waters southeast of block island, moving east at 30 knots. Visibility briefly less than 1 nautical mile is expected. Locations impacted include... Muskeget channel, the coastal waters southeast of block island, buoy 44097 southeast of block island, the coastal waters south of marthas vineyard and wasque point. Precautionary/preparedness actions... Expect gusty winds to around 25 knots...briefly rough seas and reduced visibility. Consider heading for safe harbor until this storm passes. && lat...lon 4072 7148 4114 7142 4139 7024 4092 7020 4060 7037 4061 7043 4057 7093
ANZ200 116 Pm Est Tue Jan 21 2020
Synopsis for massachusetts and rhode island coastal waters.. High pres builds in from the west and remains in control through the end of the work week. Low pressure may approach the waters from the southwest on 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 Madaket, MA
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location: 40.5, -70.62     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 211759 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1259 PM EST Tue Jan 21 2020

SYNOPSIS.

High pressure will build over southern New England through much of the week, bringing dry weather and moderating temperatures. There is the potential for a coastal storm this weekend, but uncertainty exists in regards to timing and precipitation types.

NEAR TERM /UNTIL 6 PM THIS EVENING/.

1245 AM Update .

Increased sky cover a bit across Cape Cod and the Islands for the rest of the afternoon based on satellite observations. No other changes since the previous forecast update.

10 AM Update .

Nudged down high temperatures for today a few degrees based on the latest obs as we are just a bit too warm. Otherwise forecast remains on track. Light ocean effect snow showers still possible across Cape Cod. Best opportunity for this is across the outer Cape.

Previous Discussion .

High pres in control. Column is rather dry and sunshine will give way to increasing high clouds later today from the north as mid level shortwave moves into northern New Eng. The one caveat for today is potential for ocean effect clouds and flurries/snow showers for the outer Cape. Steep low level lapse rates over the ocean and delta T from SST to top of the shallow boundary layer around 17-18C so enough low level instability for clouds and perhaps a few flurries or snow showers. N wind trajectory favors the outer Cape and some of the hi-res sources are indicating some light QPF so have indicated chc pops here. Low risk for a coating to one half inch for the outer Cape. Low level cold air remains in place with 925 mb temps around -10C so expect highs 25 to 30.

SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/.

Tonight . Any ocean effect clouds or flurries over the outer Cape will dissipate as low level moisture decreases and inversion lowers. Otherwise, some mid/high clouds expected to move through the region, especially across northern and eastern MA as shortwave rotates SE through the Gulf of Maine. Potential cloud cover may have some impact on low temps so went a bit above MOS guidance with temps mostly in the teens, with some single numbers in western MA.

Wednesday . Mid level shortwave moves well east of New Eng with ridging building into the region. High pres will remain in control at the surface. Expect lots of sunshine with light winds and moderating temps. Highs will range through the 30s.

LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/.

Highlights .

* Milder, above normal temperatures Thu/Fri with continued dry weather

* Coastal storm this weekend brings rain/snow chances Sat/Sun, favoring more rain than snow along the I-95 corridor, but uncertainty in precip type remains.

Details .

Wednesday night through Friday .

Dry, quiet weather rounds out the very quiet work week. This under a building ridge of sprawling high pressure. A noticeable change from the first half of the week will be the rebounding temperatures. We'll be back toward normal and then some as low and mid level flow comes out of the S/SW on the back side of the high and draws in milder air. A subsidence inversion under the high pressure will keep mixing very shallow (model soundings indicate to around 950 mb); should see highs in the low to mid 40s each day. A weak gradient may allow for sea breezes keeping things cooler along the coast. Lows dip into the 20s/low 30s Thursday and Friday nights, colder on Wednesday night (teens) due to light winds, little cloud cover, and resultant radiational cooling, in addition to the colder airmass we start with.

Saturday and Sunday .

For Saturday we are becoming increasingly confident that our stretch of quiet weather will come to an end, though details regarding exact onset time and precip type are less certain. A digging 500 mb trough and sfc low over the Ohio Valley move into the mid-Atlantic, generating a coastal system that will move east in the vicinity of southern New England from Saturday through Sunday, perhaps even lingering into Monday. At this point the best chance for snow continues to be in the interior, especially the higher elevations given the marginal/warm antecedent airmass and the expected low track too far north to bring with it the cold air necessary for snow to the coast. Wintry precip, however, is certainly still a possibility anywhere. EC ensemble probabilities of >1" snow continue to exhibit a SE creep over the last several model runs, so plenty is still left to be seen in regards to any snow potential for the rest of southern New England. Blocking high pressure in eastern Canada will play a role, potentially assisting with colder air, and slowing the low as it ejects. This will be a very wet system (QPF totals up to over 1" possible), and slow moving, with potential to drop a significant amount of snow in interior southern New England that would be disruptive and impactful. Stay tuned.

Monday .

Still some question as to how quickly the weekend system exits but Monday should be dry or drying out as the low exits to the northeast and high pressure builds in from the west.

AVIATION /18Z TUESDAY THROUGH SUNDAY/.

Forecaster Confidence Levels .

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

18Z discussion .

Expect VFR conditions at all terminals as high pressure builds in from the Mid Mississippi River Valley. There is potential for MVFR ceilings at HYA and ACK as winds are conducive for ocean effect clouds and possibly showers to move in. Expect these clouds to dissipate between 00Z and 03Z as drier air moves in per the latest RAP/HRRR guidance.

Winds generally less than 10 knots at terminals out of the north/northwest. Winds become light overnight and gradually back to a westerly/southwesterly direction by Wednesday morning.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF.

Outlook /Wednesday Night through Saturday/ .

Wednesday Night through Friday: VFR.

Friday Night: Mainly VFR, with local MVFR possible.

Saturday: Mainly VFR, with areas IFR possible. Breezy. Chance RA, chance SN.

MARINE.

Short Term /through Wednesday/ . High confidence.

Diminishing wind/seas becoming light today with light winds/seas continuing through Wed as high pres in control. Scattered snow showers possible today and this evening over waters east of Cape Cod.

Outlook /Wednesday Night through Saturday/ .

Wednesday Night through Thursday: Winds less than 25 kt.

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

Friday: Winds less than 25 kt. Local rough seas.

Friday Night: Winds less than 25 kt. Rough seas up to 9 ft.

Saturday: Winds less than 25 kt. Rough seas up to 9 ft. Chance of rain.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . None. RI . None. MARINE . None.

SYNOPSIS . KJC/BW NEAR TERM . BL SHORT TERM . KJC LONG TERM . BW AVIATION . BL MARINE . BL


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
44097 - Block Island, RI (154) 42 mi23 min 45°F3 ft
NTKM3 - 8449130 - Nantucket Island, MA 61 mi53 min 30°F 35°F1028.1 hPa
BUZM3 - Buzzards Bay, MA 66 mi83 min NNW 8 G 8.9 27°F 1028.6 hPa (-1.1)
44020 - NANTUCKET SOUND 71 mi43 min 1 ft

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
Nantucket, Nantucket Memorial Airport, MA60 mi30 minN 1210.00 miMostly Cloudy32°F21°F66%1027.6 hPa

Link to 5 minute data for KACK

Wind History from ACK (wind in knots)
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Last 24hrN14N10NW9NW11NW11NW8NW11NW10NW12N11NW14NW14NW11NW6NW10NW13NW12NW16N15N15N12N14N13N12
1 day agoW12NW10NW10W8NW13NW14NW20
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2 days agoSW8SW9S8--SE16SE18S22
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Tide / Current Tables for No Man's Land, Massachusetts
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No Man's Land
Click for Map
Tue -- 04:16 AM EST     Moonrise
Tue -- 04:35 AM EST     3.21 feet High Tide
Tue -- 07:03 AM EST     Sunrise
Tue -- 11:34 AM EST     -0.07 feet Low Tide
Tue -- 01:53 PM EST     Moonset
Tue -- 04:45 PM EST     Sunset
Tue -- 04:58 PM EST     2.57 feet High Tide
Tue -- 11:29 PM EST     -0.13 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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0.30.91.82.63.13.22.82.21.50.80.3-0-00.311.82.42.62.41.81.20.60.2-0.1

Tide / Current Tables for Nomans Land, Martha's Vineyard, Massachusetts
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


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.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Boston, MA (15,3,4,5)
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Ground Weather Radar Station Boston, MA
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