Tiverton, Rhode Island 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

393
FXUS61 KBOX 211719
AFDBOX

Area Forecast Discussion
National Weather Service Boston/Norton MA
1219 PM EST Thu Nov 21 2024

.SYNOPSIS...

A slow-moving low pressure area spreads welcomed steady light
to moderate rain today, before tapering to intermittent rain
showers tonight into early Friday. Rain could mix with slushy
wet snow above 1500 feet elevation tonight but no wintry impacts
are expected. Another round of steady light rain moves through
eastern New England Friday afternoon and evening. Low pressure
slowly progresses into the Maritimes for the weekend, with gusty
northwest winds and more clouds than sun are anticipated. Dry
weather then returns for Monday before an unsettled weather
pattern develops again for the middle of next week.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...

9 AM Update...

* Periods of rain today with temps in the 40s to near 50
* Quite breezy along the coast later today

Vigorous upper level energy diving southeast from the Great
Lakes will combined with low pressure south of Long Island today.
This will allow a strengthening easterly LLJ and forcing for
periods of rain today. Initial area of widespread rain was
impacting western MA into RI...while lighter scattered showers
were impacting eastern MA with the moist low level onshore
flow. The widespread rain will shift northeast and begin to
impact eastern MA over the next 1-3 hours. Periods of rain will
continue right through the afternoon with temps in the 40s to
near 50. ENE winds will increase with gusts of 20 to 30 mph
developing along the coast and even up to 35 mph possible in a
few spots by afternoon.

&&

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

Tonight

Steady moderate rain continues through about midnight before shower
activity begins to wane as the associated surface low-pressure
circulations retrogrades west into eastern New York. While widespread
shower activity will come to an end, broad cyclonic flow aloft may
continue to support a few lingering showers into the pre-dawn hours.
Winds gradually shift to the south/southwest by sunrise tomorrow.
Low temps bottom out in the mid to upper 30s. Can`t rule out a few
snow showers at the higher elevations of The Berkshires and
northern Worcester Hills, but we would not expect any accumulation.

Tomorrow

Generally a cool/cloudy unsettled day tomorrow as a broad upper-
level low meanders over The Northeast. We should dry out for a few
hours in the morning before showers redevelop by late morning/early
afternoon. This will occur as the upper-low begins to shift east
over The Atlantic Waters. Shower activity won`t be as widespread and
persistent compared to what is expected today, but an additional
tenth to quarter of an inch can be expected mainly east of I-495.
Temperatures will be close to normal again in the upper 40s/low 50s.
Southerly winds gradually become southeasterly/easterly again by the
afternoon.

&&

.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...

Highlights:

* Cloudy, damp and overcast Fri night, with steady rains breaking
  out in the coastal plain.

* Gusty NW winds this weekend, with more clouds on Sat along with
  off-and-on showers. Seasonable temps but the winds will make it
  feel cooler.

* Dry for Monday, but turning more unsettled into midweek.

Details:

Friday Night:

Cloudy, damp and unsettled conditions for Southern New England
continue into Fri night with vertically-stacked circulation
continuing to meander around western New England/southern NY
vicinity. However there still looks to be a round of steadier light
rains which develop/rotate NNW from the southern waters into eastern
MA, the Cape and the Islands. Looking at GEFS/EPS/GEPS ensemble
members, there is a significant enough majority of members which
keep this secondary burst of steadier rains into the MA/RI coastal
plain with lighter intermittent precip over western MA/CT. However
QPF amts are still pretty variable; while QPF amts are more commonly
in the quarter to half inch range in the coastal plain thru Fri
night, there are a minority of members up to 3/4ths an inch. By
early Sat AM, this band of steadier rains should shift NNE into
coastal ME/NH as the broader upper level low begins to pull
offshore.

The Weekend:

Ensembles continue to trend toward a slower NE departure of the
upper-level low and its cold pocket of air aloft for the weekend.
Thus a trend toward cloudier conditions for Sat with off-and-on
light showers, with better chances in eastern and northern MA, Cape
and Islands. Less cloud cover in general for Sunday, with more
in/around the terrain but with drier conditions. Highs on Sat in the
40s to around 50, and with a pretty strong NWly gradient flow and
cloud cover, lows may only fall into the upper 30s to low 40s. With
less cloud cover, highs Sun in the 40s to lower 50s with lows in the
30s Sun night.

The cooler temperatures aloft and a robust NW gradient flow will
also contribute to rather blustery to gusty NW winds through the
weekend. Model soundings also continue to show mixing up to about
900 mb on Sat, and slightly higher around 850 mb for Sun with a
little less cloud cover and slightly warmer temps. For Sat, NW gusts
could reach into the 25 to 30 mph range during the daytime hrs.
Strongest 925 mb jet of 35-40 kt moves thru Sat night into early on
Sun, and we should still realize gusts around 20-25 mph into the
evening for most areas, but could punch up to around 35-45 mph over
the Berkshires, hills in Worcester County as well as the Cape and
Islands. Still see gusts in the 25 to 35 mph range for Sunday thru
the early afternoon, then beginning to subside late in the day as
gradient starts to relax and low level jet core shifts offshore.
Potential for gale headlines for the waters, although over land,
confidence in gusts reaching Advisory levels is lower but could be
possible if we mix deeper. Will reassess gusts as we get into the
mesoscale model forecast horizon.

Monday:

Still looking at pretty tranquil weather conditions for Mon with
weak shortwave ridging aloft and modest SW winds allowing for highs
in the low to mid 50s.

Monday Night through Wednesday Night:

A more active weather pattern is indicated by most of the ensembles
into the early to middle part of next week, as slow-evolving trough
energy circulating over the West Coast/Pac NW begins to eject
eastward off the Rockies. At least one frontal system moves in
during this period, around the Mon night/Tue timeframe,
although there are still significant differences in strength
with this potential system. Forecast confidence is still on the
low side in this period and stayed fairly close to NBM forecasts
for this period until those differences shake out.

&&

.AVIATION /17Z THURSDAY THROUGH MONDAY/...

Forecast Confidence Levels:

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

18z TAF Update...

This afternoon and tonight...High Confidence.

Low end MVFR-IFR conditions persist this afternoon and evening
along with periods of rain/drizzle and fog. ENE winds gusts of
20 to 30 knots with the strongest along the coast. In
addition...we may see a few gusts up to 35 knots tonight across
portions of the coast.

Friday and Friday night...Moderate Confidence.

We should see temporary improvement to MVFR and even VFR Fri
morning into part of the afternoon as dryslot overspreads the
region. This will be temporary though as we do expect conditions
to lower to MVFR with localized IFR conditions later Fri and
especially Fri night along with another batch of rain. Still
some uncertainty on how far west this next main band of rain
gets...but greatest risk for it to be most widespread appears to
be eastern MA & RI. Winds becoming SSE at 5 to 15 knots
Fri...shifting to the NE Fri evening and then to the NW by
daybreak Sat.

KBOS Terminal...High Confidence in TAF. Low end MVFR-IFR
conditions in periods of rain/drizzle and fog will persist
through the evening push. ENE wind gusts of 30+ knots at times
into tonight.

KBDL Terminal...High Confidence in TAF. MVFR-IFR conditions in
periods of rain/drizzle will persist through the evening push.

Outlook /Friday Night through Monday/...

Friday Night: Mainly MVFR, with local IFR possible. Breezy. RA
likely.

Saturday: Mainly VFR, with local IFR possible. Windy with local
gusts up to 30 kt. Chance RA.

Saturday Night: Mainly VFR, with local MVFR possible. Windy
with gusts up to 35 kt. Slight chance RA.

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

Sunday Night: VFR. Breezy.

Monday: VFR.

&&

.MARINE...

Forecaster Confidence Levels:

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

Today through Friday

1015 AM Update...

* Gale Warnings posted for tonight

Low pressure south of Long Island will generate an increasing E
LLJ today. Gusts will increase into the 25 to 30 knot range this
afternoon with some gusts around 35 knots tonight. Based on the
latest guidance and good mixing with the E LLJ...opted to issue
Gales for our open waters beginning this evening through
tonight. We should see improving conditions during during the
day Friday, but still expect 5 foot seas over the outer marine
zones through Friday evening. Winds over the coastal waters on
Friday will be easterly from 10 to 20 knots with a few gusts up
to 25 knots possible.

Outlook /Friday Night through Monday/...

Friday Night: Winds less than 25 kt. Seas up to 5 ft. Rain.

Saturday: Moderate risk for Small Craft Advisory winds with
gusts up to 30 kt. Areas of rough seas. Rain likely.

Saturday Night: Moderate risk for gale force winds with gusts
up to 35 kt. Rough seas up to 11 ft. Chance of rain.

Sunday: Strong winds with gusts up to 35 kt. Rough seas up to
10 ft.

Sunday Night: Low risk for Small Craft Advisory winds with
gusts up to 30 kt. Areas of rough seas.

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

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 4 AM EST Friday for ANZ230-236.
     Gale Warning from 5 PM this afternoon to 4 AM EST Friday for
     ANZ231>235-237-250-251-254>256.

&&

$$

SYNOPSIS...Loconto/RM
NEAR TERM...Frank
SHORT TERM...RM
LONG TERM...Loconto
AVIATION...Frank/Loconto
MARINE...Frank/Loconto/RM