Alert archive / Massachusetts / Freeze Warnings in 2018

Freeze Warning 3, NWS Boston/Norton, MA

October 21, 2018Bristol County, Newport County, Rhode Island; 4 counties in Massachusetts

NWS Boston/Norton, MA issued this freeze warning at Oct 21, 2018, 2:15 AM EDT for Bristol County, Newport County, Rhode Island; 4 counties in Massachusetts. It took effect at Oct 21, 2018, 11:00 PM EDT. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Oct 21, 2018, 2:15 AM EDT (06:15 UTC)
In effect from
Oct 21, 2018, 11:00 PM EDT
Expired
Oct 22, 2018, 9:00 AM EDT
In force
10 hr
Issued by
NWS Boston/Norton, MA

Counties Essex County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Bristol County, RI, Newport County, RI

The radar

The Boston radar (KBOX), 13 km from the middle of the area, began a volume at 06:15 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Chatham, MA (KCHH), launched 00:00Z, 6.3 hours before the alert went out and 101 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Chatham, MA at 00:00Z on 2018-10-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 18 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Chatham, MA at 00:00Z on 2018-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -35 square meters per square second.1939587897117136Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
18 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
1002 m above ground
0-6 km bulk shear
75 kt
0-1 km storm-relative helicity
-35 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

720 
WWUS71 KBOX 210615
NPWBOX

URGENT - WEATHER MESSAGE
National Weather Service Boston/Norton MA
215 AM EDT Sun Oct 21 2018

MAZ007-021-RIZ005-007-211415-
/O.UPG.KBOX.FZ.A.0002.181022T0300Z-181022T1300Z/
/O.NEW.KBOX.FZ.W.0003.181022T0300Z-181022T1300Z/
Eastern Essex MA-Southern Plymouth MA-Bristol RI-Newport RI-
Including the cities of Gloucester, Mattapoisett, Bristol, 
and Newport
215 AM EDT Sun Oct 21 2018

...FREEZE WARNING IN EFFECT FROM 11 PM THIS EVENING TO 9 AM EDT
MONDAY...

The National Weather Service in Boston/Norton has issued a Freeze
Warning, which is in effect from 11 PM this evening to 9 AM EDT
Monday. The Freeze Watch is no longer in effect.

* TEMPERATURES...As low as 29.

* TIMING...Very late tonight through 9 AM Monday morning.

* IMPACTS...Freezing temperatures could kill sensitive vegetation. 

* LOCATION...Coastal Essex County, Southern Plymouth County in 
  Massachusetts. Newport and Bristol Counties in Rhode Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

MAZ024-211415-
/O.NEW.KBOX.WI.Y.0020.181021T1300Z-181021T1900Z/
Nantucket MA-
Including the city of Nantucket
215 AM EDT Sun Oct 21 2018

...WIND ADVISORY IN EFFECT FROM 9 AM THIS MORNING TO 3 PM EDT
THIS AFTERNOON...

The National Weather Service in Boston/Norton has issued a Wind
Advisory, which is in effect from 9 AM this morning to 3 PM EDT
this afternoon.

* WINDS...Northwest 20 to 30 mph with gusts up to 45 mph.

* TIMING...Strongest winds from late morning into the afternoon.

* IMPACTS...Strong winds may result in a few downed tree limbs and
  perhaps isolated power outages.

* LOCATION...Nantucket.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Advisory means that sustained winds of 31 to 39 mph are
expected, with gusts between 46 to 57 mph. Winds this strong are
capable of downing small tree limbs and branches, possibly
causing isolated power outages. Driving can also be difficult,
especially for high profile vehicles. Use extra caution.

&&

$$

MAZ015-016-211415-
/O.CON.KBOX.FZ.A.0002.181022T0300Z-181022T1300Z/
Suffolk MA-Eastern Norfolk MA-
Including the cities of Boston and Quincy
215 AM EDT Sun Oct 21 2018

...FREEZE WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH
MONDAY MORNING...

* TEMPERATURES...As low as 30.

* TIMING...Very late tonight through 9 am Monday morning.

* IMPACTS...Freezing temperatures could kill sensitive vegetation.

* LOCATION...Suffolk County and Eastern Norfolk County in
  Massachusetts. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Watch means sub-freezing temperatures are possible.
These conditions could kill crops and other sensitive vegetation.

&&

$$

Frank

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston
5 follow-up statements
180 
WWUS71 KBOX 211108
NPWBOX

URGENT - WEATHER MESSAGE
National Weather Service Boston/Norton MA
708 AM EDT Sun Oct 21 2018

MAZ007-021-RIZ005-007-211915-
/O.CON.KBOX.FZ.W.0003.181022T0300Z-181022T1300Z/
Eastern Essex MA-Southern Plymouth MA-Bristol RI-Newport RI-
Including the cities of Gloucester, Mattapoisett, Bristol, 
and Newport
708 AM EDT Sun Oct 21 2018

...FREEZE WARNING FROM 11 PM THIS EVENING TO 9 AM EDT MONDAY...

* TEMPERATURES...As low as 29.

* TIMING...Very late tonight through 9 AM Monday morning.

* IMPACTS...Freezing temperatures could kill sensitive 
  vegetation and damage unprotected outdoor plumbing.

* LOCATION...Coastal Essex County, Southern Plymouth County in 
  Massachusetts. Newport and Bristol Counties in Rhode Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

MAZ024-211915-
/O.EXT.KBOX.WI.Y.0020.181021T1300Z-181021T2200Z/
Nantucket MA-
Including the city of Nantucket
708 AM EDT Sun Oct 21 2018

...WIND ADVISORY UNTIL 6 PM EDT THIS EVENING...

* WINDS...Northwest 30 to 40 mph with gusts up to 50 mph.

* TIMING...Strongest winds from late morning into the afternoon.

* IMPACTS...Strong winds may blow down limbs, trees, and power 
  lines. Scattered power outages are expected.

* LOCATION...Nantucket.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Advisory means that sustained winds of 31 to 39 mph are
expected, with gusts between 46 to 57 mph. Winds this strong are
capable of downing small tree limbs and branches, possibly
causing isolated power outages. Driving can also be difficult,
especially for high profile vehicles. Use extra caution.

&&

$$

MAZ015-016-211915-
/O.CON.KBOX.FZ.A.0002.181022T0300Z-181022T1300Z/
Suffolk MA-Eastern Norfolk MA-
Including the cities of Boston and Quincy
708 AM EDT Sun Oct 21 2018

...FREEZE WATCH FROM THIS EVENING THROUGH MONDAY MORNING...

* TEMPERATURES...As low as 30.

* TIMING...Very late tonight through 9 am Monday morning.

* IMPACTS...Freezing temperatures could kill sensitive 
  vegetation and damage unprotected outdoor plumbing.

* LOCATION...Suffolk County and Eastern Norfolk County in 
  Massachusetts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Watch means sub-freezing temperatures are possible.
These conditions could kill crops and other sensitive vegetation.

&&

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston
167 
WWUS71 KBOX 211509
NPWBOX

URGENT - WEATHER MESSAGE
National Weather Service Boston/Norton MA
1109 AM EDT Sun Oct 21 2018

MAZ007-021-RIZ005-007-212315-
/O.CON.KBOX.FZ.W.0003.181022T0300Z-181022T1300Z/
Eastern Essex MA-Southern Plymouth MA-Bristol RI-Newport RI-
Including the cities of Gloucester, Mattapoisett, Bristol, 
and Newport
1109 AM EDT Sun Oct 21 2018

...FREEZE WARNING REMAINS IN EFFECT FROM 11 PM THIS EVENING TO
9 AM EDT MONDAY...

* TEMPERATURES...As low as 29.

* TIMING...Very late tonight through 9 AM Monday morning.

* IMPACTS...Freezing temperatures could kill sensitive 
  vegetation and damage unprotected outdoor plumbing.

* LOCATION...Coastal Essex County, Southern Plymouth County in 
  Massachusetts. Newport and Bristol Counties in Rhode Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

MAZ024-212200-
/O.CON.KBOX.WI.Y.0020.000000T0000Z-181021T2200Z/
Nantucket MA-
Including the city of Nantucket
1109 AM EDT Sun Oct 21 2018

...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM EDT THIS EVENING...

* WINDS...Northwest 25 to 35 mph with gusts up to 50 mph.

* TIMING...Strongest winds from late morning into the afternoon.

* IMPACTS...Strong winds may blow down limbs, trees, and power 
  lines. Scattered power outages are expected.

* LOCATION...Nantucket.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Wind Advisory means that sustained winds of 31 to 39 mph are
expected, with gusts between 46 to 57 mph. Winds this strong are
capable of downing small tree limbs and branches, possibly
causing isolated power outages. Driving can also be difficult,
especially for high profile vehicles. Use extra caution.

&&

$$

MAZ015-016-212315-
/O.CON.KBOX.FZ.A.0002.181022T0300Z-181022T1300Z/
Suffolk MA-Eastern Norfolk MA-
Including the cities of Boston and Quincy
1109 AM EDT Sun Oct 21 2018

...FREEZE WATCH REMAINS IN EFFECT FROM 11 PM EDT THIS EVENING
THROUGH MONDAY MORNING...

* TEMPERATURES...As low as 30.

* TIMING...Very late tonight through 9 am Monday morning.

* IMPACTS...Freezing temperatures could kill sensitive 
  vegetation and damage unprotected outdoor plumbing.

* LOCATION...Suffolk County and Eastern Norfolk County in 
  Massachusetts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Watch means sub-freezing temperatures are possible.
These conditions could kill crops and other sensitive vegetation.

&&

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston
457 
WWUS71 KBOX 211953
NPWBOX

URGENT - WEATHER MESSAGE
National Weather Service Boston/Norton MA
353 PM EDT Sun Oct 21 2018

MAZ024-212100-
/O.CAN.KBOX.WI.Y.0020.000000T0000Z-181021T2200Z/
Nantucket MA-
Including the city of Nantucket
353 PM EDT Sun Oct 21 2018

...WIND ADVISORY IS CANCELLED...

The National Weather Service in Boston/Norton has cancelled the
Wind Advisory.

Northwest winds have diminished below advisory levels.

$$

MAZ015-016-220400-
/O.UPG.KBOX.FZ.A.0002.181022T0300Z-181022T1300Z/
/O.EXA.KBOX.FZ.W.0003.181022T0300Z-181022T1300Z/
Suffolk MA-Eastern Norfolk MA-
Including the cities of Boston and Quincy
353 PM EDT Sun Oct 21 2018

...FREEZE WARNING IN EFFECT FROM 11 PM THIS EVENING TO 9 AM EDT
MONDAY...

The National Weather Service in Boston/Norton has issued a Freeze
Warning, which is in effect from 11 PM this evening to 9 AM EDT
Monday. The Freeze Watch is no longer in effect.

* TEMPERATURES...As low as 29 degrees away from the immediate 
  shoreline.

* TIMING...Very late tonight through 9 am Monday morning.

* IMPACTS...Freezing temperatures could kill sensitive vegetation
  and damage unprotected outdoor plumbing. 

* LOCATION...Suffolk County and Eastern Norfolk County in 
  Massachusetts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

MAZ007-021-RIZ005-007-220400-
/O.CON.KBOX.FZ.W.0003.181022T0300Z-181022T1300Z/
Eastern Essex MA-Southern Plymouth MA-Bristol RI-Newport RI-
Including the cities of Gloucester, Mattapoisett, Bristol, 
and Newport
353 PM EDT Sun Oct 21 2018

...FREEZE WARNING REMAINS IN EFFECT FROM 11 PM THIS EVENING TO
9 AM EDT MONDAY...

* TEMPERATURES...As low as 28 degrees.

* TIMING...Very late tonight through 9 AM Monday morning.

* IMPACTS...Freezing temperatures could kill sensitive 
  vegetation and damage unprotected outdoor plumbing.

* LOCATION...Coastal Essex County, Southern Plymouth County in 
  Massachusetts. Newport and Bristol Counties in Rhode Island.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston
444 
WWUS71 KBOX 220206
NPWBOX

URGENT - WEATHER MESSAGE
National Weather Service Boston/Norton MA
1006 PM EDT Sun Oct 21 2018

MAZ007-015-016-021-RIZ005-007-221015-
/O.CON.KBOX.FZ.W.0003.181022T0300Z-181022T1300Z/
Eastern Essex MA-Suffolk MA-Eastern Norfolk MA-
Southern Plymouth MA-Bristol RI-Newport RI-
Including the cities of Gloucester, Boston, Quincy, Mattapoisett,
Bristol, and Newport
1006 PM EDT Sun Oct 21 2018

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT MONDAY...

* TEMPERATURES...As low as 26.

* TIMING...Very late tonight through 9 am Monday morning.

* IMPACTS...Freezing temperatures could kill sensitive 
  vegetation and damage unprotected outdoor plumbing.

* LOCATION...Suffolk County and Eastern Norfolk County in 
  Massachusetts.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston
568 
WWUS71 KBOX 220727
NPWBOX

URGENT - WEATHER MESSAGE
National Weather Service Boston/Norton MA
327 AM EDT Mon Oct 22 2018

MAZ007-015-016-021-RIZ005-007-221300-
/O.CON.KBOX.FZ.W.0003.000000T0000Z-181022T1300Z/
Eastern Essex MA-Suffolk MA-Eastern Norfolk MA-
Southern Plymouth MA-Bristol RI-Newport RI-
Including the cities of Gloucester, Boston, Quincy, Mattapoisett,
Bristol, and Newport
327 AM EDT Mon Oct 22 2018

...FREEZE WARNING REMAINS IN EFFECT UNTIL 9 AM EDT THIS MORNING...

* TEMPERATURES...As low as 26.

* TIMING...Through 9 am this morning.

* IMPACTS...Freezing temperatures could kill sensitive vegetation.

* LOCATION...Includes the following counties. Eastern Essex MA, 
  Suffolk MA, Eastern Norfolk MA, Southern Plymouth MA, as well as
  Bristol and Newport RI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

For the latest updates...please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston

What forecasters said that day

The local office's own words before this freeze warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Boston/Norton, MA wrote its last area forecast discussion before this freeze warning went out at Oct 20, 8:53 PM EDT, 5 hours 22 minutes earlier.

Area forecast discussion, Oct 20, 8:53 PM EDT, 5 hours 22 minutes before
Area Forecast Discussion
National Weather Service Boston/Norton MA
853 PM EDT Sat Oct 20 2018

.SYNOPSIS...
Clouds will increase tonight as bands of showers push east
mainly after midnight. A cold front will cross the region early
Sunday morning, bringing blustery and chilly conditions through
Sunday night. One cold front moves through on Tuesday, bringing
scattered showers as well as an isolated snow shower in the
hills. Dry and colder air then pours in for Wednesday and
Thursday. High pressure brings dry and more seasonable weather
for Friday and Saturday.

&&

.NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...

850 pm Update...

While mainly dry weather will persist for the rest of the
evening...increased pops significantly after midnight and
especially toward morning based on potent upper level
shortwave/cold pool aloft approaching from the west. 500T drop
to around -30C with a period of strong forcing/deeper moisture
working across the region. This should result in a period of
widespread showers overnight into early Sunday morning across
most of the region. There are also steep mid level lapse rates
coupled with a -EPV signature...so would not be surprised if
there is even a rumble of thunder.

Boundary layer is mild enough to support all rain across the
majority of the region. However...enough dynamic cooling may
result in some wet snow flakes mixed in at times across the
highest terrain. There is even a low risk for a very small snow
accumulation on grassy surfaces at elevations near or above 1500
feet along the east slopes of the Berks.

Low temps by daybreak will mainly be in the upper 30s to the
lower 40s.

&&

.SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/...
Sunday...

May see some leftover snow showers across the Worcester hills
early Sunday morning before ending as the moisture shifts
steadily E. Remainder of the precip should push offshore by
around midday.

As the cold front pushes offshore, expect blustery NW winds to
kick in as colder air works in. H85 temps will drop during the
day, down to -5C to -7C late in the day. Expect gusts up to
25-35 mph with good mixing in place, possibly a bit higher
across the higher terrain. With the dropping H85 temps, expect
highs only in the lower-mid 40s well inland and across the
hills, ranging to the lower-mid 50s along the immediate coast.

Sunday night...

NW winds will steadily diminish, mainly less than 10 kt around
or after midnight as high pressure ridge slowly pushes E across
NY state. With mostly clear skies, should see some good
radiational cooling, allowing temps to drop.

Should see readings bottom out in the 20s across most
locations, including Martha's Vineyard and the immediate coast
where a frost or freeze has not occurred. Have issued a Freeze
Watch for most of the coastal locations that have not dropped
below freezing yet.

&&

.LONG TERM /MONDAY THROUGH SATURDAY/...
Big Picture...

Next week starts with a broad trough over the Great Lakes and
Northeast, while a ridge lingers over the Pacific Northwest.
That ridge is paired with a trough over the Desert Southwest,
creating a block that channels most of the airflow into northern
Canada before moving through the eastern trough.

One shortwave moves off through the Maritimes Monday. A second
shortwave approaches through the Great Lakes Tuesday and crosses
New England Wednesday. Models agree on evolving the shortwave
into a Maritime closed low Thursday. By this time the northwest
ridge moves east and flattens across the country, evolving into
a more zonal flow for the end of the week.

500-mb height values will be below normal Monday through Thursday,
then near normal Friday and Saturday. 850-mb thermal fields are
below normal Monday, near normal Tuesday, below normal
Wednesday through Friday, then near normal Saturday. This
suggests a cool start to the week, a brief return to normal
temps Tuesday, then below normal temps Wednesday through Friday.

Model mass fields are similar through midweek, with model-to-model
differences developing over the Western USA Thursday and
becoming more widespread Friday and Saturday. Forecast
confidence through Wednesday is high or uncertainty is
low...depending on how you look at it. By the end of the
week...confidence trends to low/uncertainty trends to high.

Concerns...

Monday...

Sfc high pressure over the Eastern and Southern USA with the
ridgeline starting the day over New England. This trends east
and offshore during the day. RH cross-sections show moisture
moving into New England during the morning, but with a dry
layer below 3000 feet AGL. The areal pattern of the RH suggests
a warm frontal cloud pattern, as do the developing southwest
winds and warm advection. Expect a lot of clouds, but dry
weather, for Monday. Mixing to 900 mb or a little above, with
temps at that level supporting max temps in the upper 40s and
lower 50s. Winds in the mixed layer are forecast as high as 20
kt, but with a couple of possible 25 kt values. We will stay
with the 20 kt forecast.

Monday night-Tuesday...

Upper shortwave and sfc cold front move through Tuesday morning,
supported by the nose of a 105 kt upper jet. Moisture and lift
are limited, but enough that when combined with the upper
dynamics should generate scattered showers, possibly mixing with
light snow showers in the western hills. Showers move off by
Tuesday evening. Mixing to 850 mb supports gusts to 20 kts and
max temps in the upper 50s and low 60s. Model values are a
little lower than this, so we will bump them up a couple of
degrees.

Tuesday night through Thursday night...

Upper trough lingers aloft with cold pool advection from
Tuesday night through Thursday. The formation of the closed low
noted above serves to maintain the flow of colder air through
Thursday. The low then moves off to the east Friday. This along
with the larger pattern suggest a period of below normal
temperatures.

RH patterns suggest partial clearing Tuesday night but at least
residual clouds for both Tuesday night and Wednesday. An
appreciable pressure gradient should support northwest to north
winds Wednesday and Thursday, then diminishing wind Friday.
Temps aloft suggest max temps in the 40s to low 50s. Based on
upstream dew points in Canada, expect min temps in the 30s
Wednesday night and 20s Thursday night...except near freezing
along the coast.

Friday-Saturday...

High pressure builds over the region Friday. This will provide
lighter wind and a trend toward more seasonable temperatures.

A developing weather system over the Gulf of Mexico is expected
to move up the Carolina coast Saturday. This may spread some
clouds our way during Saturday but otherwise a dry day. There
remains a spread of potential tracks for this weather system,
and most of them remain well offshore. None of these affect our
area before the end of the forecast period.

&&

.AVIATION /01Z SUNDAY THROUGH THURSDAY/...
Forecaster Confidence Levels...

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

Short Term /through Sunday Night/...Moderate confidence.

Tonight... Mainly VFR conditions, but lower conditions possible
after midnight in SHRA.

Sunday...
Any left over showers should exit the region Sunday morning with
brief local MVFR conditions possible. Otherwise, VFR with NW
wind gusts of 25-30 knots.

Sunday night...
VFR. NW wind gusts up to 20-25 kt early, then diminishing.

KBOS Terminal...Moderate to high confidence in TAF.

KBDL Terminal...Moderate to high confidence in TAF.

Outlook /Monday through Thursday/...

Monday: VFR. Breezy. Patchy frost.

Monday Night: VFR. Breezy.

Tuesday: Mainly VFR, with areas MVFR possible. Breezy. Slight
chance SHRA.

Tuesday Night: VFR. Breezy.

Wednesday: Mainly VFR, with local MVFR possible. Breezy. Slight
chance SHRA.

Wednesday Night through Thursday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels...

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

Short Term /through Sunday Night/...High confidence.

Tonight...

Winds are diminishing below 25 kt, but seas linger up to 8 feet
off Block Island. Small Craft Advisory for Narragansett Bay has
been allowed to expire due to the light wind, but continues
offshore. As the cold front moves across, NW winds will
increase again. Small Craft Advisories remain on Block Island
Sound and Vineyard Sound/Buzzards Bay mainly for seas and for
the expected return of the wind. Some visibility restrictions
in scattered showers and patchy fog overnight.

Sunday and Sunday night...

With strong cold air working in across the milder ocean waters,
NW winds will gust up to 25-35 kt. Have issued Gale Warnings for
most of the waters for Sunday, which should diminish to Small
Crafts Sun night. Seas up to 5-8 ft on the outer waters. May see
leftover scattered showers Sunday morning to midday.

Outlook /Monday through Thursday/...

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

Monday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Slight chance of rain showers.

Tuesday: Low risk for Small Craft Advisory winds with gusts up
to 25 kt. Areas of seas approaching 5 ft. Slight chance of rain
showers.

Tuesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of seas approaching 5 ft.

Wednesday: Low risk for Small Craft Advisory winds with gusts
up to 25 kt. Areas of seas approaching 5 ft. Slight chance of
rain showers.

Wednesday Night through Thursday: Moderate risk for Small Craft
Advisory winds with gusts up to 25 kt. Areas of seas
approaching 5 ft.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...Freeze Watch from Sunday evening through Monday morning for
     MAZ007-015-016-021.
RI...Freeze Watch from Sunday evening through Monday morning for
     RIZ005-007.
MARINE...Gale Warning from 10 AM to 5 PM EDT Sunday for ANZ232.
     Small Craft Advisory until 2 AM EDT Monday for ANZ233-234-237.
     Small Craft Advisory from 8 AM Sunday to midnight EDT Sunday
     night for ANZ230.
     Gale Warning from 11 AM to 6 PM EDT Sunday for ANZ231.
     Gale Warning from 10 AM to 4 PM EDT Sunday for ANZ235.
     Gale Warning from 10 AM to 10 PM EDT Sunday for ANZ250.
     Gale Warning from 11 AM to 7 PM EDT Sunday for ANZ251.
     Gale Warning from 10 AM to 8 PM EDT Sunday for ANZ254.
     Gale Warning from 10 AM to 7 PM EDT Sunday for ANZ255-256.

&&

SYNOPSIS...WTB/EVT
NEAR TERM...Frank
SHORT TERM...EVT
LONG TERM...WTB
AVIATION...WTB/EVT
MARINE...WTB/EVT
Hazardous weather outlook, Oct 20, 4:22 PM EDT, 9 hours 53 minutes before
Hazardous Weather Outlook
National Weather Service Boston/Norton MA
422 PM EDT Sat Oct 20 2018

CTZ002>004-MAZ002>006-008>014-017>020-022>024-026-RIZ001>004-006-008-
212030-
Hartford CT-Tolland CT-Windham CT-Western Franklin MA-
Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA-
Western Essex MA-Western Hampshire MA-Western Hampden MA-
Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA-
Western Norfolk MA-Southeast Middlesex MA-Northern Bristol MA-
Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-
Barnstable MA-Dukes MA-Nantucket MA-Northern Middlesex MA-
Northwest Providence RI-Southeast Providence RI-Western Kent RI-
Eastern Kent RI-Washington RI-Block Island RI-
422 PM EDT Sat Oct 20 2018

This Hazardous Weather Outlook is for northern Connecticut, central
Massachusetts, eastern Massachusetts, northeastern Massachusetts,
southeastern Massachusetts, western Massachusetts, northern Rhode
Island and southern Rhode Island.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MAZ007-015-016-021-RIZ005-007-212030-
Eastern Essex MA-Suffolk MA-Eastern Norfolk MA-Southern Plymouth MA-
Bristol RI-Newport RI-
422 PM EDT Sat Oct 20 2018

...FREEZE WATCH IN EFFECT FROM SUNDAY EVENING THROUGH MONDAY
MORNING...

This Hazardous Weather Outlook is for eastern Massachusetts,
northeastern Massachusetts, southeastern Massachusetts, northern
Rhode Island and southern Rhode Island.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

  Freeze Watch.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ255-256-212030-
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-
422 PM EDT Sat Oct 20 2018

...GALE WARNING IN EFFECT FROM 10 AM TO 7 PM EDT SUNDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters
and Rhode Island coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ254-212030-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
422 PM EDT Sat Oct 20 2018

...GALE WARNING IN EFFECT FROM 10 AM TO 8 PM EDT SUNDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ251-212030-
Massachusetts Bay and Ipswich Bay-
422 PM EDT Sat Oct 20 2018

...GALE WARNING IN EFFECT FROM 11 AM TO 7 PM EDT SUNDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ250-212030-
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary-
422 PM EDT Sat Oct 20 2018

...GALE WARNING IN EFFECT FROM 10 AM TO 10 PM EDT SUNDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230-233-234-236-237-212030-
Boston Harbor-Vineyard Sound-Buzzards Bay-Narragansett Bay-
Block Island Sound-
422 PM EDT Sat Oct 20 2018

This Hazardous Weather Outlook is for Massachusetts coastal waters
and Rhode Island coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ235-212030-
Rhode Island Sound-
422 PM EDT Sat Oct 20 2018

...GALE WARNING IN EFFECT FROM 10 AM TO 4 PM EDT SUNDAY...

This Hazardous Weather Outlook is for Rhode Island coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ232-212030-
Nantucket Sound-
422 PM EDT Sat Oct 20 2018

...GALE WARNING IN EFFECT FROM 10 AM TO 5 PM EDT SUNDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ231-212030-
Cape Cod Bay-
422 PM EDT Sat Oct 20 2018

...GALE WARNING IN EFFECT FROM 11 AM TO 6 PM EDT SUNDAY...

This Hazardous Weather Outlook is for Massachusetts coastal waters.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Gale Warning.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

For the latest updates, please visit our webpage at
www.weather.gov/boston

You can follow us on Facebook at
www.facebook.com/NWSBoston

You can follow us on Twitter at
@NWSBoston

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Oct 21, 2:15 AM EDTWind AdvisoryBOXNantucket14 hr

Nearby

Freeze Warnings in Massachusetts, 2018Freeze Warnings in Rhode Island, 2018Every freeze warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.