570
FXUS61 KBOX 090809
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
409 AM EDT Thu Oct 9 2025

.SYNOPSIS...
High pressure builds in from the west, bring drier and colder
conditions into Saturday. A coastal storm may bring some rain
and gusty winds to start next week, along with the risk for some
coastal flooding and erosion.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
Key Messages:

* Drier and colder today with gusty N to NW winds.

High pressure moves over the Great Lakes today. This will result
in gusty winds across southern New England for at least part of
today. Below normal temperatures anticipated.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/...
Key Messages:

* Turning cold overnight with freezing temperatures for most,
  and frost near the coast.

High pressure moves more overhead tonight. This will lead to
light to near calm winds. With clear skies, it will be a chilly
night. Frost Advisories posted near the east coast of MA, as
well as along the coast of Narragansett Bay. A trickier
decision for the Vineyard. While a few spots across the interior
could fall below freezing, thought frost would be more
widespread than the freezing temperatures, hence the Frost
Advisory there. Elsewhere, converted to Freeze Warnings where
the program continues. Decided to add western Essex County to
the Freeze Warning based on the latest temperature guidance.

Dry weather continues Friday, but temperatures expected to
remain below normal.

&&

.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...
Key Messages:

* Slightly warmer Saturday before highs return to the lower 60s

* Coastal storm may bring some rain and gusty winds to start next
  week, along with the risk for some coastal flooding and erosion

High pressure along with an upper level trough to our east will
shift out to sea going into Saturday, though 925 mb temperatures
across much of the guidance then rebounds soundly to around 10C
and higher in some spots. High temperatures Saturday will likely
be the highest of this weekend, reaching the mid to upper 60s
across the region. Some higher clouds start to move in Saturday
as well associated with a coastal storm that will continue to
form well to our south.

Some uncertainty remains regarding the start of next week. A
coastal storm moving north along the southeast and Mid Atlantic
coasts will make its way towards southern New England sometime
early Monday/late Sunday. Simultaneously, strong high pressure
is expected to be settled over parts of the Canadian Maritimes,
Quebec and Maine. The pressure gradient between this high and
the coastal storm to the south will be conducive to strong,
gusty northeast winds and rougher seas. Depending on how far
north it tracks, we may also see some more rain. Global guidance
has started to find some agreement regarding rainfall over the
region, though totals are still to be determined. The greatest
chances for rain remain over the south coast and Islands.
Confidence remains low regarding how quickly this low will exit
the region: Canadian model guidance (both ensemble and
deterministic) has it stalling over the waters to our south,
which would be more of a worst-case scenario. Seas would
continue to build after the king tides have passed and the risk
for coastal erosion and flooding would increase, though this
risk does remain minor at this time. GFS guidance remains
progressive, kicking the storm out to sea by Tuesday, and ECMWF
guidance falls somewhat between these two scenarios. Once this
storm makes its exit, winds will slacken as the gradient weakens
and seas will decrease. The track of this system should become
clearer as we get closer to this period.

&&

.AVIATION /07Z THURSDAY THROUGH MONDAY/...
Forecaster Confidence Levels...

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

Today...High confidence.

VFR. NW winds 8-12 kts with gusts 20 knots. Gusts of 20 to
30 knots toward the Cape and Nantucket.

Tonight and Friday...High confidence.

VFR. Winds diminish greatly with gusts falling off a little
before 00z and sustained winds becoming light to calm. Light
SW winds develop Friday afternoon.

KBOS Terminal...High confidence in TAF.

KBDL Terminal...High confidence in TAF.

Outlook /Friday Night through Monday/...

Friday Night through Saturday: VFR.

Saturday Night: VFR. Breezy. Slight chance SHRA.

Sunday: VFR. Windy with gusts up to 35 kt. Chance SHRA.

Sunday Night: Mainly MVFR, with local IFR possible. Strong
winds with local gusts up to 40 kt. SHRA likely.

Columbus Day: Mainly MVFR, with local IFR possible. Strong
winds with areas of gusts up to 45 kt. SHRA likely.

&&

.MARINE...
Forecaster Confidence Levels...

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

Through Friday... High confidence.

Gusty north-northwest winds and rough seas for ocean waters
will lead to continued Small Craft Advisories. Will have
improving conditions this afternoon with easing winds and
subsiding seas. High pressure settles over the waters tonight
into Friday.

Outlook /Friday Night through Monday/...

Friday Night through Saturday: Winds less than 25 kt.

Saturday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Chance of rain showers.

Sunday: Low risk for gale force winds with gusts up to 45 kt.
Areas of rough seas. Chance of rain showers.

Sunday Night: gale force winds with gusts up to 45 kt. Rough
seas up to 20 ft. Rain showers likely, slight chance of
thunderstorms.

Columbus Day: gale force winds with gusts up to 45 kt. Rough
seas up to 21 ft. Rain showers likely, slight chance of
thunderstorms. Local visibility 1 to 3 nm.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Freeze Warning from 11 PM this evening to 9 AM EDT Friday for
     CTZ002>004.
MA...Freeze Warning from 11 PM this evening to 9 AM EDT Friday for
     MAZ005-006-009>014-017-018-020-021.
     Frost Advisory from 11 PM this evening to 9 AM EDT Friday for
     MAZ007-015-016-019-023.
RI...Freeze Warning from 11 PM this evening to 9 AM EDT Friday for
     RIZ001-003-006.
     Frost Advisory from 11 PM this evening to 9 AM EDT Friday for
     RIZ002-004-005-007.
MARINE...Small Craft Advisory until 10 AM EDT this morning for ANZ230.
     Small Craft Advisory until 4 PM EDT this afternoon for
     ANZ231>234-251-256.
     Small Craft Advisory until 1 PM EDT this afternoon for ANZ235-
     237.
     Small Craft Advisory until 10 PM EDT this evening for ANZ250-
     255.
     Small Craft Advisory until 1 AM EDT Friday for ANZ254.

&&

$$

SYNOPSIS...Belk/Hrencecin
NEAR TERM...Belk
SHORT TERM...Belk
LONG TERM...Belk/Hrencecin
AVIATION...Belk/Hrencecin
MARINE...Belk/Hrencecin