Watch Hill, Rhode Island 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

409
FXUS61 KBOX 041849
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
249 PM EDT Sat Jul 4 2026

.WHAT HAS CHANGED...
No significant changes with this forecast update.

&&

.KEY MESSAGES...

- Significant heat and humidity continues for the rest of this
  afternoon and evening. Scattered showers and thunderstorms
  possible through the evening. A storm or two may produce
  strong to damaging wind gusts.

- Cooler temperatures are forecast for the first half of the
  week. Temperatures have the potential to be much cooler as a
  soaking rain is becoming more likely in the late Sunday
  through Tuesday time frame.

&&

.DISCUSSION...
KEY MESSAGE 1...Significant heat and humidity continues for the
rest of this afternoon and evening. Scattered showers and
thunderstorms possible through the evening. A storm or two may
produce strong to damaging wind gusts.

Hot and humid conditions ongoing across southern New England,
with temperatures and heat indices alike well into the mid-to-
upper 90s. Heat Advisory in effect for northern CT, majority of
MA, and RI until 8 PM EDT this evening.

Elsewhere, convection is continuing across upstate NY and
central/south VT. This activity is trying to "split the gap"
between southern MA/northern CT/RI and northeastern MA. The
northeastern MA solution is winning at the moment, with a
cluster of storms crossing over into parts of Essex County as of
2:45 PM EDT.

High-resolution guidance has been rather ugly in trying to
picture how the rest of this afternoon and evening unfolds.
Overall, ultimately think that this splits up into two different
"events" (such that they are): this afternoon between now and
5-6 PM, and another between 8-11 PM. Firework shows this evening
could be dicey at times, particularly for eastern MA. Showers
and storms move offshore by 2 AM EDT at the latest.

Cold front due before sunrise Sunday morning, where a wind shift
from the NNE will kick in, veering to the ENE throughout the
day. Highs much more reasonable in the low-to-mid 80s.

KEY MESSAGE 2...Cooler temperatures are forecast for the first
half of the week. Temperatures have the potential to be much
cooler as a soaking rain is becoming more likely in the late
Sunday through Tuesday time frame.

High confidence remains that temps will cool down and return to
more seasonable summer readings thru next week. For starters
850 mb temps are forecast to cool to between +12 to +15C. That
will be enough to get temps back into the 80s on its own.
Dewpoints are also forecast to cool down as well, which will
make things feel more comfortable than it has been.

Temps may also be much cooler if we can get substantial cloud
cover and rain into the forecast area. Overnight guidance has
doubled the number of ensemble members with more than 1 inch of
QPF. Now nearly all of the ECMWF ensemble members are in that
camp around BDL, with roughly half of members greater than 1
inch as you move northeast to BOS. However the GEFS has also
moved on board with roughly half of all members at or above 1
inch QPF across southern New England. Deterministic model
guidance is forecasting mid level warm advection to produce an
area of frontogenesis, giving this a little more synoptic
support for rainfall than the more typical scattered summertime
convective pattern to rainfall. NBM PoP looks pretty good at
this range, with categorical across the southwestern forecast
area and likely farther northeast, given the timing uncertainty.
Rain could begin as early as late Sun night and continue thru
Tue. Right now 6 hr FFG across much of the forecast area is at
least 3 inches, so I am not anticipating flooding unless we see
guidance really start to ramp up QPF numbers.

&&

.AVIATION /18Z SATURDAY THROUGH THURSDAY/...
Forecaster Confidence Levels...

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

18Z TAF Update...

Today through Sunday...High confidence.

VFR conditions dominate today through Sunday. All eyes on the
convection ongoing across parts of upstate NY and VT. These
storms have already showed signs of "splitting the gap" between
northern CT/RI/southern MA and northeastern MA. High resolution
guidance continues to show a wide variety of possibilities
regarding areal coverage and intensity of storms this afternoon.
As a result, we`re keeping around the PROB30 for TSRA at most
mainland terminals from 18-21Z. Threw in a second PROB30 group
at KBOS from 00-03Z this evening to account for a potential
second round of storms. Storms should eastward off the
Cape/Islands by 06Z at the latest tonight. Frontal passage
expected before sunrise Sunday morning, where a wind shift from
the NNE is expected. Winds will continue to veer towards the ENE
throughout the day.

WNW winds may but to 20+ knots at times this afternoon.

KBOS Terminal...Moderate confidence in TAF. Uncertainty
surrounding thunderstorm coverage and duration.

KBDL Terminal...High confidence in TAF.

Outlook /Sunday Night through Thursday/...

Monday: Mainly VFR, with local IFR possible. Breezy. SHRA
likely, slight chance TSRA.

Monday Night: Mainly MVFR, with local IFR possible. Breezy.
SHRA likely, slight chance TSRA.

Tuesday: Mainly VFR, with local IFR possible. Breezy. SHRA
likely, chance TSRA.

Tuesday Night: Mainly VFR, with local MVFR possible. Breezy.
Chance SHRA, slight chance TSRA.

Wednesday through Wednesday Night: VFR.

Thursday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

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

Today through Sunday...High confidence.

A relatively weak pressure gradient will keep winds/seas below small
craft advisory thresholds this holiday Weekend. Some 20+ knot
WNW wind gusts over the land this afternoon may result in some
nearshore chop...but no headlines will be needed for the waters
this weekend with seas generally 3 feet or less.

Outlook /Sunday Night through Thursday/...

Monday: Winds less than 25 kt. Chance of rain showers, slight
chance of thunderstorms.

Monday Night: Winds less than 25 kt. Areas of seas approaching
5 ft. Rain showers likely, slight chance of thunderstorms.

Tuesday: Moderate risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas up to 5 ft. Rain showers likely, chance
of thunderstorms.

Tuesday Night: Winds less than 25 kt. Seas up to 5 ft. Chance
of rain showers, slight chance of thunderstorms.

Wednesday through Wednesday Night: Winds less than 25 kt. Seas
up to 5 ft.

Thursday: Winds less than 25 kt. Seas locally approaching 5 ft.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Heat Advisory until 8 PM EDT this evening for CTZ002>004.
MA...Heat Advisory until 8 PM EDT this evening for MAZ002>023-026.
RI...Heat Advisory until 8 PM EDT this evening for RIZ001>007.
MARINE...None.

&&

$$

DISCUSSION...Boatman/Legro
AVIATION...Boatman
MARINE...Boatman