Winter Weather Advisory 19, NWS Boston/Norton, MA

497 
WWUS41 KBOX 241917
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
217 PM EST Fri Dec 24 2021

MAZ020-021-RIZ006-007-250830-
/O.EXA.KBOX.WW.Y.0019.211225T0600Z-211225T1500Z/
Southern Bristol MA-Southern Plymouth MA-Washington RI-Newport RI-
Including the cities of Fall River, New Bedford, Mattapoisett, 
Narragansett, Westerly, and Newport
217 PM EST Fri Dec 24 2021

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 AM TO 10 AM EST
SATURDAY...

* WHAT...Mixed precipitation expected. Total snow accumulations 
  of up to one inch and ice accumulations of a light glaze.

* WHERE...In Massachusetts, Southern Bristol MA and Southern 
  Plymouth MA Counties. In Rhode Island, Washington RI and 
  Newport RI Counties.

* WHEN...From 1 AM to 10 AM EST Saturday.

* IMPACTS...Plan on slippery road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

CTZ002>004-MAZ013-015>019-RIZ001>005-250830-
/O.CON.KBOX.WW.Y.0019.211225T0600Z-211225T1500Z/
Hartford CT-Tolland CT-Windham CT-Western Norfolk MA-Suffolk MA-
Eastern Norfolk MA-Northern Bristol MA-Western Plymouth MA-
Eastern Plymouth MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-
Bristol RI-
Including the cities of Hartford, Windsor Locks, Union, Vernon, 
Putnam, Willimantic, Foxborough, Norwood, Boston, Quincy, 
Taunton, Brockton, Plymouth, Foster, Smithfield, Providence, 
Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, 
and Bristol
217 PM EST Fri Dec 24 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 1 AM TO 10 AM
EST SATURDAY...

* WHAT...Mixed precipitation expected. Total snow accumulations of
  up to one inch and ice accumulations of up to one tenth of an 
  inch.

* WHERE...Portions of northern Connecticut, eastern and 
  southeastern Massachusetts and northern Rhode Island.

* WHEN...From 1 AM to 10 AM EST Saturday.

* IMPACTS...Plan on slippery road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

MAZ002>012-014-026-250830-
/O.CON.KBOX.WW.Y.0019.211225T0600Z-211225T1800Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Eastern Essex MA-
Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA-
Eastern Hampden MA-Southern Worcester MA-Southeast Middlesex MA-
Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, Gloucester, 
Chesterfield, Blandford, Amherst, Northampton, Springfield, 
Milford, Worcester, Cambridge, and Ayer
217 PM EST Fri Dec 24 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 1 AM TO 1 PM
EST SATURDAY...

* WHAT...Mixed precipitation expected. Total snow accumulations 
  of up to one inch and ice accumulations of up to one tenth of 
  an inch.

* WHERE...Portions of central, eastern, northeastern and western 
  Massachusetts.

* WHEN...From 1 AM to 1 PM EST Saturday.

* IMPACTS...Plan on slippery road conditions.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

049 
WWUS41 KBOX 250906
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
406 AM EST Sat Dec 25 2021

CTZ002-251800-
/O.EXT.KBOX.WW.Y.0019.000000T0000Z-211225T1800Z/
Hartford CT-
Including the cities of Hartford and Windsor Locks
406 AM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 PM EST THIS
AFTERNOON...

* WHAT...Freezing rain. Ice accumulations of up to one tenth of 
  an inch.

* WHERE...Hartford CT County.

* WHEN...Until 1 PM EST this afternoon.

* IMPACTS...Slippery travel conditions this morning, especially 
  on untreated surfaces. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

MAZ002>006-026-252215-
/O.EXT.KBOX.WW.Y.0019.000000T0000Z-211226T0000Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, and Ayer
406 AM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 7 PM EST THIS
EVENING...

* WHAT...Freezing rain. Ice accumulations of one tenth to two 
  tenths of an inch.

* WHERE...Northern Massachusetts, especially north of Route 2. 

* WHEN...Until 7 PM EST this evening.

* IMPACTS...Slippery travel conditions this morning continuing
  into the afternoon due to icy roads. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

CTZ003-004-MAZ013-015>021-RIZ001>007-251500-
/O.CON.KBOX.WW.Y.0019.000000T0000Z-211225T1500Z/
Tolland CT-Windham CT-Western Norfolk MA-Suffolk MA-
Eastern Norfolk MA-Northern Bristol MA-Western Plymouth MA-
Eastern Plymouth MA-Southern Bristol MA-Southern Plymouth MA-
Northwest Providence RI-Southeast Providence RI-Western Kent RI-
Eastern Kent RI-Bristol RI-Washington RI-Newport RI-
Including the cities of Union, Vernon, Putnam, Willimantic, 
Foxborough, Norwood, Boston, Quincy, Taunton, Brockton, Plymouth,
Fall River, New Bedford, Mattapoisett, Foster, Smithfield, 
Providence, Coventry, West Greenwich, East Greenwich, Warwick, 
West Warwick, Bristol, Narragansett, Westerly, and Newport
406 AM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 AM EST THIS
MORNING...

* WHAT...Freezing rain. Ice accumulations of a light glaze to less
  than one tenth of an inch. 

* WHERE...Portions of northeast Connecticut, eastern and
  southeastern Massachusetts and northern and Rhode Island.

* WHEN...Until 10 AM EST this morning.

* IMPACTS...Slippery travel conditions this morning, especially 
  on untreated surfaces. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

MAZ007>012-014-251800-
/O.CON.KBOX.WW.Y.0019.000000T0000Z-211225T1800Z/
Eastern Essex MA-Western Hampshire MA-Western Hampden MA-
Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA-
Southeast Middlesex MA-
Including the cities of Gloucester, Chesterfield, Blandford, 
Amherst, Northampton, Springfield, Milford, Worcester, 
and Cambridge
406 AM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 PM EST THIS
AFTERNOON...

* WHAT...Freezing rain. Ice accumulations of up to one tenth of 
  an inch.

* WHERE...Portions of western, central and northeast
  Massachusetts.

* WHEN...Until 1 PM EST this afternoon.

* IMPACTS...Slippery travel conditions this morning, especially 
  on untreated surfaces. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

138 
WWUS41 KBOX 251451
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
951 AM EST Sat Dec 25 2021

MAZ017>021-RIZ005>007-251600-
/O.CAN.KBOX.WW.Y.0019.000000T0000Z-211225T1500Z/
Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-
Southern Bristol MA-Southern Plymouth MA-Bristol RI-Washington RI-
Newport RI-
Including the cities of Taunton, Brockton, Plymouth, Fall River, 
New Bedford, Mattapoisett, Bristol, Narragansett, Westerly, 
and Newport
951 AM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY IS CANCELLED...

Temperatures have warmed above freezing for most locations and any
freezing rain will change over to a plain rain soon. People will 
still want to exercise caution if traveling.

$$

CTZ003-004-MAZ013-015-016-RIZ001>004-251800-
/O.EXT.KBOX.WW.Y.0019.000000T0000Z-211225T1800Z/
Tolland CT-Windham CT-Western Norfolk MA-Suffolk MA-
Eastern Norfolk MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-
Including the cities of Union, Vernon, Putnam, Willimantic, 
Foxborough, Norwood, Boston, Quincy, Foster, Smithfield, 
Providence, Coventry, West Greenwich, East Greenwich, Warwick, 
and West Warwick
951 AM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 PM EST THIS
AFTERNOON...

* WHAT...Freezing rain. Ice accumulations of a light glaze to less
  than one tenth of an inch.

* WHERE...Portions of northern Connecticut, eastern 
  Massachusetts and northern Rhode Island.

* WHEN...Until 1 PM EST this afternoon.

* IMPACTS...Slippery travel conditions, especially on untreated 
  surfaces. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

CTZ002-MAZ008>012-260000-
/O.EXT.KBOX.WW.Y.0019.000000T0000Z-211226T0000Z/
Hartford CT-Western Hampshire MA-Western Hampden MA-
Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA-
Including the cities of Hartford, Windsor Locks, Chesterfield, 
Blandford, Amherst, Northampton, Springfield, Milford, 
and Worcester
951 AM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 7 PM EST THIS
EVENING...

* WHAT...Freezing rain. Additional ice accumulations of around 
  one tenth of an inch.

* WHERE...Portions of northern Connecticut and central and 
  western Massachusetts.

* WHEN...Until 7 PM EST this evening.

* IMPACTS...Difficult travel conditions are possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. Prepare for possible
power outages. 

&&

$$

MAZ007-014-251800-
/O.CON.KBOX.WW.Y.0019.000000T0000Z-211225T1800Z/
Eastern Essex MA-Southeast Middlesex MA-
Including the cities of Gloucester and Cambridge
951 AM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 1 PM EST THIS
AFTERNOON...

* WHAT...Freezing rain. Ice accumulations of a light glaze to less
  than one tenth of an inch.

* WHERE...Southeast Middlesex MA and Eastern Essex MA Counties.

* WHEN...Until 1 PM EST this afternoon.

* IMPACTS...Slippery travel conditions, especially on untreated 
  surfaces. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

MAZ002>006-026-260000-
/O.CON.KBOX.WW.Y.0019.000000T0000Z-211226T0000Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, and Ayer
951 AM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM EST THIS
EVENING...

* WHAT...Freezing rain. Additional ice accumulations of around 
  one tenth of an inch.

* WHERE...Portions of central, eastern, northeastern and western 
  Massachusetts.

* WHEN...Until 7 PM EST this evening.

* IMPACTS...Difficult travel conditions are possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. Prepare for possible
power outages. 

&&

$$

BL

202 
WWUS41 KBOX 251800
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
100 PM EST Sat Dec 25 2021

CTZ003-004-MAZ013-015-016-RIZ001>004-251900-
/O.EXP.KBOX.WW.Y.0019.000000T0000Z-211225T1800Z/
Tolland CT-Windham CT-Western Norfolk MA-Suffolk MA-
Eastern Norfolk MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-
Including the cities of Union, Vernon, Putnam, Willimantic, 
Foxborough, Norwood, Boston, Quincy, Foster, Smithfield, 
Providence, Coventry, West Greenwich, East Greenwich, Warwick, 
and West Warwick
100 PM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY WILL EXPIRE AT 1 PM EST THIS
AFTERNOON...

Temperatures have warmed above freezing for most locations, so
freezing rain has changed over to rain. There still may be a few
icy spots, so if traveling exercise caution.

$$

MAZ007-014-251900-
/O.EXP.KBOX.WW.Y.0019.000000T0000Z-211225T1800Z/
Eastern Essex MA-Southeast Middlesex MA-
Including the cities of Gloucester and Cambridge
100 PM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY WILL EXPIRE AT 1 PM EST THIS
AFTERNOON...

Temperatures have warmed above freezing for most locations, so
freezing rain has changed over to rain. There still may be a few
icy spots, so if traveling exercise caution.

$$

MAZ002>006-026-260000-
/O.CON.KBOX.WW.Y.0019.000000T0000Z-211226T0000Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, and Ayer
100 PM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM EST THIS
EVENING...

* WHAT...Freezing rain. Ice accumulations of a light glaze to less
  than one tenth of an inch.

* WHERE...Portions of central, eastern, northeastern and western 
  Massachusetts.

* WHEN...Until 7 PM EST this evening.

* IMPACTS...Slippery travel conditions, especially on untreated 
  surfaces. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

CTZ002-MAZ008>012-260000-
/O.CON.KBOX.WW.Y.0019.000000T0000Z-211226T0000Z/
Hartford CT-Western Hampshire MA-Western Hampden MA-
Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA-
Including the cities of Hartford, Windsor Locks, Chesterfield, 
Blandford, Amherst, Northampton, Springfield, Milford, 
and Worcester
100 PM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM EST THIS
EVENING...

* WHAT...Freezing rain. Ice accumulations of a light glaze to less
  than one tenth of an inch.

* WHERE...Portions of northern Connecticut and central and 
  western Massachusetts.

* WHEN...Until 7 PM EST this evening.

* IMPACTS...Slippery travel conditions, especially on untreated 
  surfaces. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

388 
WWUS41 KBOX 252014
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
314 PM EST Sat Dec 25 2021

MAZ002>006-026-260600-
/O.EXT.KBOX.WW.Y.0019.000000T0000Z-211226T0600Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, and Ayer
314 PM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 AM EST SUNDAY...

* WHAT...Freezing rain. Additional ice accumulations of a light 
  glaze.

* WHERE...Portions of central, eastern, northeastern and western 
  Massachusetts.

* WHEN...Until 1 AM EST Sunday.

* IMPACTS...Very slippery sidewalks, roads and bridges are 
  possible.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. Prepare for possible
power outages. 

&&

$$

CTZ002-MAZ008>012-260000-
/O.CON.KBOX.WW.Y.0019.000000T0000Z-211226T0000Z/
Hartford CT-Western Hampshire MA-Western Hampden MA-
Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA-
Including the cities of Hartford, Windsor Locks, Chesterfield, 
Blandford, Amherst, Northampton, Springfield, Milford, 
and Worcester
314 PM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM EST THIS
EVENING...

* WHAT...Freezing rain. Additional ice accumulations of a light
  glaze.

* WHERE...Portions of northern Connecticut and central and 
  western Massachusetts.

* WHEN...Until 7 PM EST this evening.

* IMPACTS...Slippery travel conditions, especially on untreated 
  surfaces. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

539 
WWUS41 KBOX 252349
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
649 PM EST Sat Dec 25 2021

CTZ002-MAZ008>012-260100-
/O.CAN.KBOX.WW.Y.0019.000000T0000Z-211226T0000Z/
Hartford CT-Western Hampshire MA-Western Hampden MA-
Eastern Hampshire MA-Eastern Hampden MA-Southern Worcester MA-
Including the cities of Hartford, Windsor Locks, Chesterfield, 
Blandford, Amherst, Northampton, Springfield, Milford, 
and Worcester
649 PM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY IS CANCELLED...

Temperatures across the region were mainly in the 33 to 34 degree
range just above the freezing mark. Therefore, we have cancelled
the Winter Weather Advisory. However, a few spots remained around
the freezing point so a few icy spots remain possible on 
untreated roadways. In addition, temperatures may drop a degree or
so overnight allowing for areas of black ice to develop on
untreated roadways. Therefore, motorists are still urged to drive
with extra caution overnight.

$$

MAZ002>006-026-261000-
/O.EXT.KBOX.WW.Y.0019.000000T0000Z-211226T1000Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, and Ayer
649 PM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 5 AM EST SUNDAY...

* WHAT...Mixed precipitation. A coating to 2 inches of snow
  possible mainly in north central and northeast Massachusetts.
  Additional ice accumulations of a light glaze.

* WHERE...Much of the northern half of Massachusetts away from the
  immediate coast.

* WHEN...Until 5 AM EST Sunday.

* IMPACTS...Untreated roads may be slippery. This is especially
  true across north central and northeast Massachusetts, where
  light rain and spotty freezing drizzle this evening may change 
  to a period of snow after midnight. A coating to 2 inches of 
  snow is possible before the precipitation comes to an end by 
  daybreak.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

Frank

218 
WWUS41 KBOX 260358
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
1058 PM EST Sat Dec 25 2021

MAZ002>006-026-261000-
/O.CON.KBOX.WW.Y.0019.000000T0000Z-211226T1000Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, and Ayer
1058 PM EST Sat Dec 25 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM EST
SUNDAY...

* WHAT...Mixed precipitation. A coating to 2 inches of snow 
  possible mainly in north central and northeast Massachusetts. 
  Additional ice accumulations of a light glaze.

* WHERE...Much of the northern half of Massachusetts away from 
  the immediate coast.

* WHEN...Until 5 AM EST Sunday.

* IMPACTS...Untreated roads may be slippery. This is especially
  true across north central and northeast Massachusetts, where
  light rain and spotty freezing drizzle this evening may change
  to a period of snow after midnight. A coating to 2 inches of
  snow is possible before the precipitation comes to an end by
  daybreak.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

397 
WWUS41 KBOX 260818
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
318 AM EST Sun Dec 26 2021

MAZ002>006-026-261000-
/O.CON.KBOX.WW.Y.0019.000000T0000Z-211226T1000Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, and Ayer
318 AM EST Sun Dec 26 2021

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM EST EARLY
THIS MORNING...

* WHAT...Mixed precipitation. A coating to 1 inches of snow 
  possible mainly in north central and northeast Massachusetts. 
  Additional ice accumulations of a light glaze.

* WHERE...Much of the northern half of Massachusetts away from 
  the immediate coast.

* WHEN...Until 5 AM EST Sunday.

* IMPACTS...Untreated roads may be slippery. This is especially
  true across north central and northeast Massachusetts, where
  light rain and spotty freezing drizzle this evening may change
  to a period of snow after midnight. A coating to 1 inch of snow
  is possible before the precipitation comes to an end by 
  daybreak.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling. 

&&

$$

Area Forecast Discussion
National Weather Service Boston/Norton MA
1258 AM EST Fri Dec 24 2021

.SYNOPSIS...
High pressure over the East Coast will diminish as it moves offshore
Friday. Weak low pressure breaks through the weakening high late
tonight and Friday. Another storm system brings the threat for
rain and some wintry precipitation to the region Christmas Day,
but uncertainty on details remain. After a brief respite, more
unsettled weather is possible for the first half of next week
but nothing very impactful is currently expected.

&&

.NEAR TERM /UNTIL 6 AM THIS MORNING/...
1255 AM update...

Light snow beginning to develop across western MA/CT but low
levels are still rather dry which will limit intensity. Steadier
snow will develop next few hours as low levels moisten. Some
modest lift in generated into the snow growth region as
shortwave approaches and nose of a modest low level jet impinges
on the region. This will result in minor accum (up to 1")
across western and central MA into northern CT. Light snow
expected to develop around or a bit after daybreak in eastern
New Eng.

&&

.SHORT TERM /6 AM THIS MORNING THROUGH 6 PM SATURDAY/...
Overview...

Shortwave trough moves off to the east. Shortwave ridge moves
overhead Friday.  Next shortwave trough approaches Friday night.

Details...

Light snow that begins late tonight tapers off on Friday. A
shortwave ridge moves overhead and may provide enough subsidence for
brief partial clearing Friday afternoon. Will show light snow in the
morning, tapering off by midday. Afternoon highs in the 30s.

A 50-kt jet moves up the Ohio Valley. Will it move east enough to
generate lift over Srn New England? GFS and ECMWF hold these winds
to the southwest. Meanwhile, 130-kt upper jet moves over the
Northeast and should generate enough lift for returning clouds
Friday night. Based on the two jets and the potential for
lift...will forecast chance pops after midnight. Initial precip
occurs during the cold part of the night, so will expect snow or
sleet at onset.

&&

.LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/...
Highlights

*  Wintry mix Christmas morning to transition to a rainy Christmas
   day
*  Unsettled weather early next week with a chance for rain/snow
   Monday through Wednesday.

Saturday and Sunday

A surface low-pressure system approaching from the Midwest Christmas
morning will lift a surface-warm front through southern New England
on Christmas Day. This will provide sufficient forcing for
precipitation on Christmas morning. Unfortunately for those hoping
for snow on Christmas morning the outlook does not look good.
Temperatures at 850 hPa and 925 hPa are expected to be above
freezing as the warm front lifts through the region. With sub-
freezing temperatures in the low-levels this would be supportive of
either sleet or freezing rain depending on the depth of the melting
layer aloft. Right now confidence is low in that department with the
NAM supporting a more shallow melting layer/sleet temperature
profile and the global models supporting a deeper melting
layer/freezing rain temperatures profile.

Regardless of what kind of frozen precipitation we see early in
the day, surface temps are expected to rise above freezing by
late morning. This will result in a changeover to rain for most
of the region. Expect showers to continue into Saturday night as
the surface low-pressure system moves over southern New
England. We could see another round of frozen precipitation late
Saturday night as temperatures fall back below freezing.

Lingering showers taper of Sunday morning as northwest flow behind
the low-pressure systems ushers cooler drier air into southern New
England. This will set the stage for clearing skies and another
cold/blustery day with gusty northwest winds and high temperatures
in the upper 30s to low 40s.

Monday through Wednesday

Upper-level ridge positions itself over the eastern US next week.
This will limit any significant precipitation for southern New
England. However, models are hinting at a few pulses of short-wave
energy riding along the ridge that may support slight chance
rain/snow showers early next week. As this ridge breaks down during
the middle of next week, we may have the potential to see more
substantial winter precipitation in the Wednesday/Thursday time
frame as a low-pressure system develops over the Midwest and
approaches the Northeast. Confidence is very low at this point,
so won't dive into details at this time.

&&

.AVIATION /06Z FRIDAY THROUGH TUESDAY/...
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.

Through 12z...
Cigs/vsbys lowering to MVFR across central/W MA and northern CT
as light snow develops, with areas of IFR vsbys possible.
Mainly VFR in eastern New Eng with some light snow possible
toward 12z.

Today...Moderate confidence.
Mainly MVFR in light snow in the morning, with pockets of IFR
possible. Snow ending by midday in eastern New Eng but MVFR cigs
may linger into late afternoon near the coast with gradual
improvement to VFR interior. Light winds.

Tonight...Moderate confidence.
Mainly VFR cigs but MVFR may develop late in the west. Light
mixed precip possible after midnight, with snow/sleet in
northern MA and freezing rain possible south of the Pike. Light
to calm winds.

Saturday...Moderate confidence.
Conditions lowering to IFR with rain along the south coast and mixed
precip/freezing rain changing to rain further inland. Pockets of
freezing rain may linger through the day in NE MA. Light winds.

KBOS Terminal...Moderate confidence.

KBDL Terminal... Moderate confidence.

Outlook /Saturday Night through Tuesday/...

Saturday Night: MVFR/IFR conditions possible. Breezy. Chance
RA, chance FZRA.

Sunday: Mainly VFR, with local MVFR possible. Windy with local
gusts up to 30 kt. Slight chance RA, slight chance FZRA.

Sunday Night: VFR. Breezy.

Monday: Mainly VFR, with local IFR possible. Breezy. Slight
chance SN.

Monday Night: Mainly VFR, with areas IFR possible. Slight
chance RA, slight chance SN.

Tuesday: MVFR/IFR conditions possible. Chance RA, slight chance
SN.

&&

.MARINE...
Forecaster Confidence Levels.

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

Tonight... Northwest winds diminishing through the night. Winds
gusting 20-25 kt in the evening, but 15 kt or less after midnight.
Seas 5 feet on the outer waters early tonight, but 3 feet or less by
morning. Continue Small Craft Advisory on the outer waters through
early tonight.

Friday...

Weak weather system moves across Srn New England from early morning
through midday. This will bring a period of light rain to the
waters, with light snow along the coast. Light wind, seas 1 to 3
feet.

Friday night...

Quiet weather to start the night, with light winds and 1 to 3 foot
seas. Clouds increase overnight with a chance of rain toward
morning.

Outlook /Saturday Night through Tuesday/...

Christmas Day: Winds less than 25 kt. Chance of rain, slight
chance of freezing rain.

Saturday Night: Winds less than 25 kt. Local rough seas. Rain
likely.

Sunday: Moderate risk for Small Craft Advisory winds with gusts
up to 30 kt. Rough seas up to 13 ft. Chance of rain showers,
slight chance of rain.

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

Monday: Winds less than 25 kt. Local rough seas. Slight chance
of rain.

Monday Night: Winds less than 25 kt. Seas locally approaching
5 ft. Slight chance of rain. Local visibility 1 to 3 nm.

Tuesday: Winds less than 25 kt. Slight chance of rain.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 1 AM EST early this morning for
     ANZ250-254.

&&

SYNOPSIS...WTB/RM
NEAR TERM...WTB/KJC
SHORT TERM...WTB
LONG TERM...RM
AVIATION...KJC/RM
MARINE...WTB/RM

Hazardous Weather Outlook
National Weather Service Boston/Norton MA
435 PM EST Thu Dec 23 2021

CTZ002>004-MAZ002>024-026-RIZ001>008-242145-
Hartford CT-Tolland CT-Windham CT-Western Franklin MA-
Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA-
Western Essex MA-Eastern Essex MA-Western Hampshire MA-
Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA-
Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA-
Suffolk MA-Eastern Norfolk MA-Northern Bristol MA-
Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA-
Southern Plymouth MA-Barnstable MA-Dukes MA-Nantucket MA-
Northern Middlesex MA-Northwest Providence RI-
Southeast Providence RI-Western Kent RI-Eastern Kent RI-Bristol RI-
Washington RI-Newport RI-Block Island RI-
435 PM EST Thu Dec 23 2021

This Hazardous Weather Outlook is for northern Connecticut, all of
Massachusetts east of Berkshire County, and Rhode Island.

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230>237-250-251-254>256-242145-
Boston Harbor-Cape Cod Bay-Nantucket Sound-Vineyard Sound-
Buzzards Bay-Rhode Island Sound-Narragansett Bay-Block Island Sound-
Coastal waters east of Ipswich Bay and the Stellwagen Bank National
Marine Sanctuary-Massachusetts Bay and Ipswich Bay-
Coastal waters from Provincetown MA to Chatham MA to Nantucket MA
out 20 nm-
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-
435 PM EST Thu Dec 23 2021

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

.DAY ONE...Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

For more information on upcoming hazardous weather, please see the
Area Forecast Discussion on our webpage for the latest forecast
thinking. There is also our Enhanced Hazardous Weather Outlook at
www.weather.gov/box/ehwo

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

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