Friday, September18, 2020
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Marine Weather and Tides
West Chatham, 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 6:23AMSunset 6:46PM Friday September 18, 2020 11:17 PM EDT (03:17 UTC) Moonrise 7:34AMMoonset 7:50PM Illumination 3% Phase: Waxing Crescent; Moon at 2 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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ANZ254 Coastal Waters From Provincetown Ma To Chatham Ma To Nantucket Ma Out 20 Nm- 1016 Pm Edt Fri Sep 18 2020
.gale warning in effect through Saturday afternoon...
Overnight..N winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 8 ft.
Sat..N winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 8 ft.
Sat night..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 7 ft.
Sun..NE winds 15 to 20 kt with gusts up to 25 kt. Seas 7 to 10 ft.
Sun night through Mon night..N winds 20 to 25 kt with gusts up to 40 kt. Seas 9 to 14 ft.
Tue..N winds 25 to 30 kt with gusts up to 45 kt. Seas 12 to 17 ft.
Tue night..NW winds 20 to 25 kt with gusts up to 40 kt. Seas 11 to 16 ft.
Wed..W winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 9 ft.
Wed night..W winds around 10 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 1016 Pm Edt Fri Sep 18 2020
Synopsis for massachusetts and rhode island coastal waters.. High pressure brings cool and dry air for the weekend. Gusty northeast winds and rough seas will continue through the weekend. Hurricane teddy will move north into the maritimes by Tuesday, passing well east of the southern new england waters. Teddy will bring the potential for gale force north to northeast winds, as well as seas building to between 10 and 15 plus feet across our eastern waters. This may result in dangerous conditions for mariners who should keep posted on the latest weather forecasts. Winds and seas will diminish Wednesday as teddy moves off to the north. 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 West Chatham, MA
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location: 41.73, -69.97     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 190246 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 1046 PM EDT Fri Sep 18 2020

SYNOPSIS. Unseasonably cool and dry conditions persist into early next week. Hurricane Teddy is looking less of a direct threat to our region. However it should pass close enough to bring a period of high surf and perhaps minor coastal flooding/minor beach erosion issues into early next week. Temperatures will moderate significantly by the middle of next week with dry weather continuing. Little if any rainfall is expected through the middle of next week.

NEAR TERM /UNTIL 6 AM SATURDAY MORNING/. 1030pm update .

* Frost Advisories for the East Slopes of the Berkshires.

Forecast is on track this evening with clearing skies continuing behind the front as much drier air filters in with winds out of the north. Overnight lows fall into the 30s for parts of Western MA where the winds decouple and as such, Frost Advisories are posted. Further east, winds are expected to stay elevated through the night and lows only fall into the upper 30s to mid 40s.

Previous Discussion .

A cold front will continue to move offshore. High pressure will continue to provide dry weather with gusty north to northeast winds as the the colder air arrives.

Favored the lowest of the guidance tonight due to really dry air and clearing skies. Continued the Frost Advisory for portions of western MA. A few locations could approach freezing, but not expecting it to be widespread enough to go with a Freeze Warning. Will need to be monitored overnight.

SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/. High pressure dominates this portion of the forecast, Dry weather with below normal temperatures continue. Gusty winds diminish during the day. Expecting some locations across far western MA may require a Freeze Warning Saturday night.

LONG TERM /SUNDAY THROUGH FRIDAY/. Highlights .

* Unseasonably cool weather continues through early next week

* Gusty NE winds into next week bringing high surf and the chance for minor coastal flooding/beach erosion

* Likely that we have little to no precipitation through Thursday. There remains a low probability that Hurricane Teddy could track far enough west to bring some rain around Mon/Tue.

Details .

Sunday through Tuesday .

Biggest features of this period will be the expansive high pressure over New England/Canada and Hurricane Teddy, with southern New England sandwiched somewhat in between. The main impact from this will be gusty northeast winds as the pressure gradient tightens with Teddy's passing to our east. The locations most prone to seeing wind gusting 25 to 35 mph will be Cape Cod and the islands, and especially the offshore waters. Guidance continued to hold steady or even shift more eastward in both deterministic and ensemble members, so not thinking we'll see much if any rain from this. The main impact will be both wind as Teddy becomes extratropical and the wind field expands, and rough seas/high surf. With this, high astronomical tides may lead to some pockets of minor coastal flooding. Cooler than average temperatures continue with onshore flow from the northeast. Sunday should be the coolest day of the forecast with highs about 15 degrees below normal, in the mid to upper 50s. The warmest spot will be the CT valley which should warm into the low 60s. A slow warming trend begins Monday into Tuesday as flow becomes more NW bringing temps back into the 60s.

Wednesday through Friday .

Dry weather prevails for some time after Teddy exits into the maritimes and upper level ridging returns. Temperatures will also continue to rebound back toward normal by mid week as flow becomes NW then W. Our next shot at some unsettled weather comes toward Friday as the next shortwave approaches from the Great Lakes.

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

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

Tonight: High confidence.

VFR conditions. For interior terminals, N winds at 5 to 10 kts. For coastal terminals, N to NNE winds at 15 to 20 kts with gusts up to 30 kts.

Saturday and Saturday Night: High confidence.

VFR. Gusty N to NNE winds diminish during the day.

KBOS Terminal . High confidence in TAF.

KBDL Terminal . High confidence in TAF.

Outlook /Sunday through Wednesday/ .

Sunday through Sunday Night: VFR. Breezy.

Monday: VFR. Windy with areas of gusts up to 30 kt.

Monday Night: VFR. Strong winds with local gusts up to 40 kt.

Tuesday: VFR. Strong winds with gusts up to 40 kt.

Tuesday Night: VFR. Windy with gusts up to 35 kt.

Wednesday: VFR. Breezy.

MARINE. Gusty N to NNE winds continue across the waters as the remnants of Sally depart and a high pressure pushes colder air over the coastal waters. Gale Warnings continue for marginal conditions. At least Small Craft Advisory conditions on all other waters for a time this evening. High pressure moves more over the waters late Saturday, causing winds to diminish. Rough seas will continue through Saturday night, especially across the outer coastal waters.

Outlook /Sunday through Wednesday/ .

Sunday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Rough seas up to 11 ft.

Sunday Night through Monday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 13 ft.

Monday Night: Low risk for gale force winds with gusts up to 40 kt. Rough seas up to 16 ft.

Tuesday: Moderate risk for gale force winds with gusts up to 45 kt. Rough seas up to 19 ft.

Tuesday Night: Low risk for gale force winds with gusts up to 40 kt. Rough seas up to 17 ft.

Wednesday: Winds less than 25 kt. Areas of rough seas.

FIRE WEATHER. After collaborating with state agencies, will be issuing a statement to highlight the elevated potential for fire spread.

TIDES/COASTAL FLOODING. Large high pressure over eastern Canada/northern New England will combined with the remnants of Sally passing well south of our region into Sat. This will be followed by Hurricane Teddy, which should pass well east of our region early next week.

This synoptic setup will result in persistent gusty NE winds along the coast with high seas across our open waters. This will result in High Surf/Dangerous rip currents into early next week. In addition, high astronomical tides between 11.6 and 11.8 MLLW in Boston into early next week will result in pockets of beach erosion and pockets of minor coastal flooding. Appears Sun, Mon and possibly Tue may be most prone to these conditions given built up offshore seas and NE winds. Fortunately, the Hurricane should pass far enough east of our region to prevent any significant coastal flooding issues.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Frost Advisory until 8 AM EDT Saturday for MAZ002-003-008>011. RI . None. MARINE . Gale Warning until 4 PM EDT Saturday for ANZ232-254-255. Small Craft Advisory until 8 PM EDT Sunday for ANZ231-233>235- 237-250-251-256.

SYNOPSIS . Belk/BW NEAR TERM . Belk/BW/Chai SHORT TERM . Belk LONG TERM . BW AVIATION . Belk/BW MARINE . Belk/BW FIRE WEATHER . TIDES/COASTAL FLOODING .


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
CHTM3 3 mi47 min NNE 17 G 23 60°F 62°F
44090 20 mi20 min 63°F3 ft
44020 - NANTUCKET SOUND 23 mi27 min NNE 16 G 19 69°F2 ft
NTKM3 - 8449130 - Nantucket Island, MA 31 mi47 min NNE 8.9 G 20 61°F 67°F
WAXM3 - Waquoit Bay Reserve, MA 31 mi92 min W 1 55°F 1017 hPa47°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 34 mi27 min N 18 G 21 61°F 5 ft1017.1 hPa (+1.7)48°F
BZBM3 - 8447930 - Woods Hole, MA 40 mi47 min 59°F 69°F

Wind History for Nantucket Island, MA
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Chatham, Chatham Municipal Airport, MA2 mi25 minVar 610.00 miFair59°F50°F72%1017.1 hPa
Hyannis, Barnstable Municipal-Boardman Airport, MA17 mi21 minNNE 910.00 miFair58°F51°F78%1016.5 hPa
Provincetown Municipal Airport, MA23 mi21 minNNE 13 G 1810.00 miPartly Cloudy60°F51°F72%1017.6 hPa

Link to 5 minute data for KCQX

Wind History from CQX (wind in knots)
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Tide / Current Tables for Pleasant Bay, Quonset Pont, Massachusetts
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Pleasant Bay
Click for Map
Fri -- 02:40 AM EDT     3.92 feet High Tide
Fri -- 06:23 AM EDT     Sunrise
Fri -- 07:34 AM EDT     Moonrise
Fri -- 09:33 AM EDT     -0.43 feet Low Tide
Fri -- 03:07 PM EDT     3.83 feet High Tide
Fri -- 06:43 PM EDT     Sunset
Fri -- 07:49 PM EDT     Moonset
Fri -- 09:56 PM EDT     -0.42 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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1.933.83.93.42.71.91.10.3-0.3-0.40.21.22.43.43.83.62.92.11.30.5-0.2-0.4-0.1

Tide / Current Tables for Pollock Rip Channel, Massachusetts Current
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Pollock Rip Channel
Click for Map
Fri -- 12:57 AM EDT     -2.17 knots Max Ebb
Fri -- 04:05 AM EDT     0.00 knots Slack
Fri -- 06:23 AM EDT     Sunrise
Fri -- 07:25 AM EDT     2.43 knots Max Flood
Fri -- 07:34 AM EDT     Moonrise
Fri -- 10:42 AM EDT     -0.00 knots Slack
Fri -- 01:24 PM EDT     -2.14 knots Max Ebb
Fri -- 04:31 PM EDT     0.00 knots Slack
Fri -- 06:43 PM EDT     Sunset
Fri -- 07:45 PM EDT     2.31 knots Max Flood
Fri -- 07:49 PM EDT     Moonset
Fri -- 10:58 PM EDT     -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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-1.9-2.2-1.9-1.2-0.111.92.42.41.90.9-0.4-1.5-2.1-2-1.5-0.60.51.62.22.321.1-0

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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