Alert archive / Massachusetts / Winter Storm Watches in 2017

Winter Storm Watch 8, NWS Boston/Norton, MA

March 29, 20177 counties in Massachusetts

NWS Boston/Norton, MA issued this winter storm watch at Mar 29, 2017, 3:51 PM EDT for 7 counties in Massachusetts. It took effect at Mar 31, 2017, 8:00 AM EDT. It was in force for .

The area

The counties it named.

The facts

Issued
Mar 29, 2017, 3:51 PM EDT (19:51 UTC)
In effect from
Mar 31, 2017, 8:00 AM EDT
Expired
Mar 31, 2017, 3:48 AM EDT
In force
Issued by
NWS Boston/Norton, MA

Counties Essex County, MA, Franklin County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA

The radar

The Boston radar (KBOX), 67 km from the middle of the area, began a volume at 19:55 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 12:00Z, 7.9 hours before the alert went out and 163 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 12:00Z on 2017-03-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2017-03-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
574 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
83 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

128 
WWUS41 KBOX 291951
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Taunton MA
351 PM EDT Wed Mar 29 2017

MAZ002>006-008-010-026-300400-
/O.NEW.KBOX.WS.A.0008.170331T1200Z-170401T1800Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Western Hampshire MA-
Eastern Hampshire MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, Chesterfield, Amherst, 
Northampton, and Ayer
351 PM EDT Wed Mar 29 2017

...WINTER STORM WATCH IN EFFECT FROM FRIDAY MORNING THROUGH
SATURDAY AFTERNOON...

The National Weather Service in Taunton has issued a Winter Storm
Watch, which is in effect from Friday morning through Saturday
afternoon.

* LOCATIONS...Interior northern Massachusetts north of the Mass 
  Pike.

* HAZARD TYPES...Snow sleet and freezing rain.

* ACCUMULATIONS...Potential for snow accumulation of 6 inches or
  more with greatest risk over the higher elevations near the
  Route 2 corridor. Up to a tenth of an inch of ice accumulation
  is also possible with locally up to one quarter inch over the
  higher elevations.

* TIMING...Snow developing Friday morning and may mix with or
  change to sleet and freezing rain Friday night. Precipitation
  will be heavy at times late Friday and Friday night. 

* IMPACTS...Snow and ice will make for hazardous travel
  conditions, especially later Friday into Friday night. The
  accumulation of wet snow and/or ice on trees and power lines 
  may result in some power outages. 

* VISIBILITIES...one quarter to one half mile at times.

* CONFIDENCE...Precipitation types and accumulations are uncertain
  as the area will be close to the snow/ice/rain line. Where this
  zone sets up will determine how much snow and ice accumulates.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow, sleet, or ice accumulations that may impact travel.
Continue to monitor the latest forecasts. Be prepared to modify
travel plans should winter weather develop.

&&

$$

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
632 
WWUS41 KBOX 300814
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Taunton MA
414 AM EDT Thu Mar 30 2017

MAZ002>006-008-010-026-301615-
/O.CON.KBOX.WS.A.0008.170331T1200Z-170401T1800Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Western Hampshire MA-
Eastern Hampshire MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, Chesterfield, Amherst, 
Northampton, and Ayer
414 AM EDT Thu Mar 30 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY MORNING
THROUGH SATURDAY AFTERNOON...

* LOCATIONS...Interior northern Massachusetts north of the Mass 
  Pike.

* HAZARD TYPES...Snow sleet and freezing rain.

* ACCUMULATIONS...Snow accumulation of 4 to 8 inches, along with
  up to 0.1 inch of ice.

* TIMING...Snow developing Friday morning may mix with or change
  to sleet and freezing rain by Friday night. Precipitation will 
  be heavy at times late Friday and Friday night.

* IMPACTS...Snow and ice accumulations will make many roads 
  treacherous and impassable. The weight of the snow and ice on 
  tree limbs and power lines could produce scattered outages. 

* VISIBILITIES...One quarter to one half mile at times.

* CONFIDENCE...Precipitation types and accumulations are 
  uncertain as the area will be close to the snow/ice/rain line. 
  Where this zone sets up will determine how much snow and ice 
  accumulates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow, sleet, or ice accumulations that may impact travel.
Continue to monitor the latest forecasts. Be prepared to modify
travel plans should winter weather develop.

&&

$$

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
017 
WWUS41 KBOX 301342
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Taunton MA
942 AM EDT Thu Mar 30 2017

MAZ002>006-008-010-026-302145-
/O.CON.KBOX.WS.A.0008.170331T1200Z-170401T1800Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Western Hampshire MA-
Eastern Hampshire MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, Chesterfield, Amherst, 
Northampton, and Ayer
942 AM EDT Thu Mar 30 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY MORNING
THROUGH SATURDAY AFTERNOON...

* LOCATIONS...Interior northern Massachusetts north of the Mass 
  Pike.

* HAZARD TYPES...Snow sleet and freezing rain.

* ACCUMULATIONS...Snow accumulation of 4 to 8 inches, along with 
  up to 0.1 inch of ice.

* TIMING...Snow developing Friday morning may mix with or change 
  to sleet and freezing rain by Friday night. Precipitation will 
  be heavy at times late Friday and Friday night.

* IMPACTS...Snow and ice accumulations will make many roads 
  treacherous and impassable. The weight of the snow and ice on 
  tree limbs and power lines could produce scattered outages.

* VISIBILITIES...One quarter to one half mile at times.

* CONFIDENCE...Precipitation types and accumulations are 
  uncertain as the area will be close to the snow/ice/rain line. 
  Where this zone sets up will determine how much snow and ice 
  accumulates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow, sleet, or ice accumulations that may impact travel.
Continue to monitor the latest forecasts. Be prepared to modify
travel plans should winter weather develop.

&&

$$

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
866 
WWUS41 KBOX 301959
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Taunton MA
359 PM EDT Thu Mar 30 2017

CTZ002>004-MAZ009-011-012-310400-
/O.NEW.KBOX.WW.Y.0016.170331T0600Z-170401T1200Z/
Hartford CT-Tolland CT-Windham CT-Western Hampden MA-
Eastern Hampden MA-Southern Worcester MA-
Including the cities of Hartford, Windsor Locks, Union, Vernon, 
Putnam, Willimantic, Blandford, Springfield, Milford, 
and Worcester
359 PM EDT Thu Mar 30 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 2 AM FRIDAY TO 8 AM EDT
SATURDAY...

The National Weather Service in Taunton has issued a Winter
Weather Advisory, which is in effect from 2 AM Friday to 8 AM EDT
Saturday.

* LOCATIONS...Northern Connecticut, southwest and south central
  Massachusetts.

* HAZARD TYPES...A mixture of snow, sleet and freezing rain.

* ACCUMULATIONS...Snow and sleet accumulation of 1 to 4 inches.
  Highest snow and sleet amounts closest to the Massachusetts
  turnpike. A tenth to one quarter inch of ice accretion is
  possible above 800 feet.

* TIMING...Snow and sleet will overspread the region between 2 and
  6 am Friday morning. The precipitation will be mixed with light
  rain in the lower elevations. A wintry mix will continue at
  times into Friday afternoon, before precipitation changes to 
  mainly rain sometime Friday night. However, pockets of freezing 
  rain will persist in the hills of northeast Connecticut and 
  southern Worcester Hills.

* IMPACTS...The greatest concern is in the hills of northeast
  Connecticut as well as the Worcester Hills, where temperatures
  will be colder. Untreated roads may be slippery for both the 
  Friday morning and Friday evening rush hours in the high 
  terrain. In the lower elevations, roads will probably be mainly 
  wet but some slippery spots can not be ruled out.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet, or 
freezing rain will cause travel difficulties. Be prepared for 
slippery roads and limited visibilities, and use caution while 
driving.

&&

$$

MAZ013-016-RIZ001-310400-
/O.NEW.KBOX.WW.Y.0016.170331T1200Z-170401T1200Z/
Western Norfolk MA-Eastern Norfolk MA-Northwest Providence RI-
Including the cities of Foxborough, Norwood, Quincy, Foster, 
and Smithfield
359 PM EDT Thu Mar 30 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 AM FRIDAY TO 8 AM EDT
SATURDAY...

The National Weather Service in Taunton has issued a Winter
Weather Advisory, which is in effect from 8 AM Friday to 8 AM EDT
Saturday.

* LOCATIONS...Northwest Rhode Island and Norfolk county in eastern
  Massachusetts.

* HAZARD TYPES...Snow and sleet with some pockets of freezing rain
  possible across the hills of northwest Rhode Island.

* ACCUMULATIONS...Snow and sleet accumulation of 1 to 4 inches, 
  along with up to a tenth of ice accretion possible in northwest 
  Rhode Island.

* TIMING...A mixture of snow...sleet and rain will overspread the
  region between 6 am and 10 am Friday morning. The heaviest of
  the precipitation will hold off until Friday afternoon and
  night. An extended period of sleet is possible Friday afternoon
  into Friday night with an impact to the Friday evening rush hour
  possible. Most of the precipitation will change to rain Friday
  night, but some pockets of freezing rain may persist in
  northwest Rhode Island.

* IMPACTS...Snow and particularly sleet accumulations will create
  slippery travel. While the bulk of the Friday morning rush hour
  will probably feature wet roads, accumulating sleet possibly
  mixed with snow will impact the Friday evening rush resulting in
  slippery travel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet, or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving.

&&

$$

MAZ007-014-015-310400-
/O.EXB.KBOX.WS.A.0008.170331T1800Z-170401T2100Z/
Eastern Essex MA-Southeast Middlesex MA-Suffolk MA-
Including the cities of Gloucester, Cambridge, and Boston
359 PM EDT Thu Mar 30 2017

...WINTER STORM WATCH IN EFFECT FROM FRIDAY AFTERNOON THROUGH
SATURDAY AFTERNOON...

The National Weather Service in Taunton has issued a Winter Storm
Watch, which is in effect from Friday afternoon through Saturday
afternoon.

* LOCATIONS...northeast Massachusetts including the Boston
  Metropolitan area.

* HAZARD TYPES...Snow and sleet.

* ACCUMULATIONS...4 to 8 inches of snow and sleet possible.

* TIMING...A mixture of snow, sleet and rain will develop Friday
  morning but little if any accumulations are expected in the
  morning. The precipitation will become heavier Friday afternoon
  and evening with snow and/or sleet the main precipitation type.
  Snow and sleet may change to rain for a time Friday night, but 
  probably will change back to snow Saturday morning and may 
  continue into the afternoon.

* IMPACTS...Untreated roads will become slippery for the Friday
  evening commute with snow and/or sleet. Slippery travel may
  continue into Saturday morning with more snow and sleet
  possible. If the higher snow amounts are realized, there will be
  a risk for some downed tree limbs and isolated power outages. 

* CONFIDENCE...Precipitation types and accumulations are uncertain
  as the area will be close to the snow/sleet/rain line. 
 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow, sleet, or ice accumulations that may impact travel.
Continue to monitor the latest forecasts. Be prepared to modify
travel plans should winter weather develop.

&&

$$

MAZ002>006-008-010-026-310400-
/O.EXT.KBOX.WS.A.0008.170331T1200Z-170401T2100Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Western Hampshire MA-
Eastern Hampshire MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, Chesterfield, Amherst, 
Northampton, and Ayer
359 PM EDT Thu Mar 30 2017

...WINTER STORM WATCH NOW IN EFFECT FROM FRIDAY MORNING THROUGH
SATURDAY AFTERNOON...

* LOCATIONS...Interior northern Massachusetts north of the Mass 
  Pike.

* HAZARD TYPES...Snow sleet and freezing rain.

* ACCUMULATIONS...Snow accumulation of 4 to 8 inches, but there
  may be a swath of 6 to 12 inches north of Route 2 near the New
  Hampshire border. There also may be around a tenth of an inch 
  of ice accretion.
  
* TIMING...Snow develops between 2 and 8 AM Friday morning. The
  precipitation will get heavier Friday afternoon and
  evening...but may mix with or change to sleet. Some pockets of
  freezing rain are also possible. All precipitation may change
  back to snow Saturday morning.

* IMPACTS...Snow and ice accumulations will make many roads
  slippery. If the higher snow amounts are realized there will be
  the risk for downed tree limbs and scattered power outages.

* CONFIDENCE...Precipitation types and accumulations are uncertain
  as the area will be close to the snow/sleet and freezing rain
  line. Where this zone sets up will determine how much snow and
  sleet accumulates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow, sleet, or ice accumulations that may impact travel.
Continue to monitor the latest forecasts. Be prepared to modify
travel plans should winter weather develop.

&&

$$

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
288 
WWUS41 KBOX 310206
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Taunton MA
1006 PM EDT Thu Mar 30 2017

CTZ002>004-MAZ009-011-012-311015-
/O.CON.KBOX.WW.Y.0016.170331T0600Z-170401T1200Z/
Hartford CT-Tolland CT-Windham CT-Western Hampden MA-
Eastern Hampden MA-Southern Worcester MA-
Including the cities of Hartford, Windsor Locks, Union, Vernon, 
Putnam, Willimantic, Blandford, Springfield, Milford, 
and Worcester
1006 PM EDT Thu Mar 30 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 2 AM FRIDAY TO
8 AM EDT SATURDAY...

* LOCATIONS...Northern Connecticut, southwest and south central 
  Massachusetts.

* HAZARD TYPES...A mixture of snow, sleet and freezing rain.

* ACCUMULATIONS...Snow accumulation of 1 to 3 inches, along with 
  around a trace of ice.

* TIMING...Snow and sleet will overspread the region between 2 and
  6 am. The precipitation will be mixed with light rain in the
  lower elevations. A wintry mix will continue at times into the
  afternoon, before precipitation changes to mainly rain sometime
  tomorrow night. However, pockets of freezing rain will persist 
  in the hills of northeast Connecticut and southern Worcester 
  Hills.

* IMPACTS...Ice and snow accumulations will create treacherous 
  driving conditions. The weight of the ice and snow on tree 
  limbs and power lines could produce scattered outages. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet, or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving.

&&

$$

MAZ013-016-RIZ001-311015-
/O.CON.KBOX.WW.Y.0016.170331T1200Z-170401T1200Z/
Western Norfolk MA-Eastern Norfolk MA-Northwest Providence RI-
Including the cities of Foxborough, Norwood, Quincy, Foster, 
and Smithfield
1006 PM EDT Thu Mar 30 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 AM FRIDAY TO
8 AM EDT SATURDAY...

* LOCATIONS...Northwest Rhode Island and Norfolk county in 
  eastern Massachusetts.

* HAZARD TYPES...Snow and sleet with some pockets of freezing 
  rain possible across the hills of northwest Rhode Island.

* ACCUMULATIONS...Snow accumulation of 2 to 4 inches, along with 
  around a trace of ice.

* TIMING...A mixture of snow...sleet and rain will overspread the
  region between 6 am and 10 am. The heaviest of the precipitation
  will hold off until tomorrow afternoon and night. An extended
  period of sleet is possible tomorrow afternoon into tomorrow
  night with an impact to the Friday evening rush hour possible.
  Most of the precipitation will change to rain tomorrow night, 
  but some pockets of freezing rain may persist in northwest Rhode
  Island.

* IMPACTS...Snow and ice accumulations will create treacherous 
  driving conditions and produce isolated brief power outages. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet, or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving.

&&

$$

MAZ002>006-008-010-026-311015-
/O.CON.KBOX.WS.A.0008.170331T1200Z-170401T2100Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Central Middlesex MA-Western Essex MA-Western Hampshire MA-
Eastern Hampshire MA-Northern Middlesex MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Framingham, Lowell, Lawrence, Chesterfield, Amherst, 
Northampton, and Ayer
1006 PM EDT Thu Mar 30 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM 8 AM EDT FRIDAY
THROUGH SATURDAY AFTERNOON...

* LOCATIONS...Interior northern Massachusetts north of the Mass 
  Pike.

* HAZARD TYPES...Snow sleet and freezing rain.

* ACCUMULATIONS...Snow accumulation of 4 to 8 inches, along with 
  around a tenth of an inch of ice.

* TIMING...Snow develops between 2 and 8 AM. The precipitation
  will get heavier tomorrow afternoon and evening... but may mix 
  with or change to sleet. Some pockets of freezing rain are also 
  possible. All precipitation may change back to snow Saturday 
  morning.

* IMPACTS...Snow and ice accumulations will make many roads 
  treacherous and impassable. The weight of the snow and ice on 
  tree limbs and power lines could produce scattered outages. 

* CONFIDENCE...Precipitation types and accumulations are 
  uncertain as the area will be close to the snow/sleet and 
  freezing rain line. Where this zone sets up will determine how 
  much snow and sleet accumulates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow, sleet, or ice accumulations that may impact travel.
Continue to monitor the latest forecasts. Be prepared to modify
travel plans should winter weather develop.

&&

$$

MAZ007-014-015-311015-
/O.CON.KBOX.WS.A.0008.170331T1800Z-170401T2100Z/
Eastern Essex MA-Southeast Middlesex MA-Suffolk MA-
Including the cities of Gloucester, Cambridge, and Boston
1006 PM EDT Thu Mar 30 2017

...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY AFTERNOON
THROUGH SATURDAY AFTERNOON...

* LOCATIONS...Northeast Massachusetts including the Boston 
  Metropolitan area.

* HAZARD TYPES...Snow and sleet.

* ACCUMULATIONS...4 to 6 inches of snow.

* TIMING...A mixture of snow, sleet and rain will develop during
  the morning but little if any accumulations are expected. The
  precipitation will become heavier during the afternoon and
  evening with snow and/or sleet the main precipitation type. Snow
  and sleet may change to rain for a time tomorrow night, but 
  probably will change back to snow Saturday morning and may 
  continue into the afternoon.

* IMPACTS...The heavy snow will make many roads impassable and 
  may produce widespread power outages due to the weight of the 
  snow on tree limbs and power lines. 

* CONFIDENCE...Precipitation types and accumulations are 
  uncertain as the area will be close to the snow/sleet/rain 
  line.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Watch means there is a potential for significant
snow, sleet, or ice accumulations that may impact travel.
Continue to monitor the latest forecasts. Be prepared to modify
travel plans should winter weather develop.

&&

$$

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
850 
WWUS41 KBOX 310748
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Taunton MA
348 AM EDT Fri Mar 31 2017

CTZ002>004-MAZ009-011-012-311600-
/O.CAN.KBOX.WW.Y.0016.000000T0000Z-170401T1200Z/
/O.NEW.KBOX.WW.Y.0017.170331T1200Z-170401T1200Z/
Hartford CT-Tolland CT-Windham CT-Western Hampden MA-
Eastern Hampden MA-Southern Worcester MA-
Including the cities of Hartford, Windsor Locks, Union, Vernon, 
Putnam, Willimantic, Blandford, Springfield, Milford, 
and Worcester
348 AM EDT Fri Mar 31 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 8 AM THIS MORNING TO
8 AM EDT SATURDAY...

The National Weather Service in Taunton has issued a Winter
Weather Advisory for a mix of snow and sleet, along with a few
pockets of freezing rain, which is in effect from 8 AM this 
morning to 8 AM EDT Saturday.

* LOCATIONS...Northern Connecticut, southwest and south central 
  Massachusetts.

* HAZARD TYPES...A mixture of snow, sleet and freezing rain.

* ACCUMULATIONS...Snow and sleet accumulation of 2 to 4 inches 
  especially in the higher terrain, along with around a trace of 
  ice.

* TIMING...Snow and sleet will gradually increase across the
  region this morning, followed by a lull. The precipitation will
  be mixed with light rain in the lower elevations. A mix of
  mainly rain with light snow will then begin by evening and
  continue into the morning tomorrow. There is a low risk that the
  precipitation will change back to a mix of sleet and snow before
  ending tomorrow.

* IMPACTS...Snow and ice accumulations will create hazardous
  driving conditions and could produce isolated brief power
  outages. Some of the snow will not stick to roadways, but 
  rather grassy surfaces and vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet, or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving.

&&

$$

MAZ002>004-008-010-311600-
/O.UPG.KBOX.WS.A.0008.170331T1200Z-170401T2100Z/
/O.NEW.KBOX.WS.W.0006.170331T1500Z-170401T1500Z/
Western Franklin MA-Eastern Franklin MA-Northern Worcester MA-
Western Hampshire MA-Eastern Hampshire MA-
Including the cities of Charlemont, Greenfield, Orange, Barre, 
Fitchburg, Chesterfield, Amherst, and Northampton
348 AM EDT Fri Mar 31 2017

...WINTER STORM WARNING IN EFFECT FROM 11 AM THIS MORNING TO
11 AM EDT SATURDAY...

The National Weather Service in Taunton has issued a Winter Storm
Warning for a mix of snow and sleet which is in effect from 11 AM
this morning to 11 AM EDT Saturday. The Winter Storm Watch is no 
longer in effect.

* LOCATIONS...Northwestern and north central Massachusetts.

* HAZARD TYPES...Snow and sleet.

* ACCUMULATIONS...6 to 9 inches of snow and sleet.

* TIMING...Some light snow and sleet is possible today. The
  precipitation will then get heavier by late afternoon and
  evening mixing with sleet at times. Precipitation may change 
  back to all snow Saturday morning.

* IMPACTS...The heavy snow will make many roads impassable and may
  produce widespread power outages due to the weight of the snow
  on tree limbs and power lines, especially in the higher terrain.
  Initially some of the snow will not stick to roadways, but
  rather grassy surfaces and vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning is issued when an average snowfall of
6 inches or more is expected within a 12 hour period, or for
8 inches or more in a 24 hour period. Travel will be slow at best
on well treated surfaces, and quite difficult on untreated
surfaces. Only travel in an emergency. If you must travel, keep
an extra flashlight, food, and water in your vehicle in case of
an emergency.

&&

$$

MAZ005-006-026-311600-
/O.UPG.KBOX.WS.A.0008.170331T1200Z-170401T2100Z/
/O.NEW.KBOX.WS.W.0006.170331T1800Z-170401T1800Z/
Central Middlesex MA-Western Essex MA-Northern Middlesex MA-
Including the cities of Framingham, Lowell, Lawrence, and Ayer
348 AM EDT Fri Mar 31 2017

...WINTER STORM WARNING IN EFFECT FROM 2 PM THIS AFTERNOON TO
2 PM EDT SATURDAY...

The National Weather Service in Taunton has issued a Winter Storm
Warning for a mix of snow and sleet, which is in effect from 2 PM
this afternoon to 2 PM EDT Saturday. The Winter Storm Watch is no
longer in effect.

* LOCATIONS...Northern Middlesex and Essex Counties.

* HAZARD TYPES...Snow and sleet

* ACCUMULATIONS...6 to 9 inches of snow with some sleet mixing 
  in.

* TIMING...A light mix of snow and sleet overspread late this
  morning. The precipitation then gets heavier late this afternoon
  and evening. Overnight a mix of occasional heavy snow and sleet
  are likely, followed by a change to all snow tomorrow morning.

* IMPACTS...The heavy snow will make many roads impassable and may
  produce widespread power outages due to the weight of the snow
  on tree limbs and power lines. The snow may struggle to
  accumulate on roadways at first, but will pick up in intensity
  late. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Storm Warning is issued when an average snowfall of
6 inches or more is expected within a 12 hour period, or for
8 inches or more in a 24 hour period. Travel will be slow at best
on well treated surfaces, and quite difficult on untreated
surfaces. Only travel in an emergency. If you must travel, keep
an extra flashlight, food, and water in your vehicle in case of
an emergency.

&&

$$

MAZ007-014-015-311600-
/O.UPG.KBOX.WS.A.0008.170331T1800Z-170401T2100Z/
/O.EXB.KBOX.WW.Y.0016.170331T1800Z-170401T1800Z/
Eastern Essex MA-Southeast Middlesex MA-Suffolk MA-
Including the cities of Gloucester, Cambridge, and Boston
348 AM EDT Fri Mar 31 2017

...WINTER WEATHER ADVISORY IN EFFECT FROM 2 PM THIS AFTERNOON TO
2 PM EDT SATURDAY...

The National Weather Service in Taunton has issued a Winter
Weather Advisory for a mix of snow, sleet and heavy rain, which 
is in effect from 2 PM this afternoon to 2 PM EDT Saturday. The 
Winter Storm Watch is no longer in effect.

* LOCATIONS...Northeast coastal Massachusetts including the 
  Boston Metropolitan area.

* HAZARD TYPES...Snow and sleet, mixing with rain late.

* ACCUMULATIONS...2 to 6 inches of snow.

* TIMING...Snow and sleet are possible at times through afternoon
  but accumulations will be very light. The precipitation becomes
  heavier late this afternoon and evening with snow and/or sleet
  the main precipitation type. Snow and sleet may change to rain
  for a time during the night, but probably will change back to 
  snow Saturday morning and may continue into the afternoon.

* IMPACTS...The heavy snow may make some roads hazardous and may
  produce widespread power outages due to the weight of the snow
  on tree limbs and power lines. Snow may struggle to accumulate
  on roadways initially, but when the intensity increases tonight
  into tomorrow, there is a higher risk for hazardous travel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet, or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving.

&&

$$

MAZ013-016-RIZ001-311600-
/O.CON.KBOX.WW.Y.0016.170331T1200Z-170401T1200Z/
Western Norfolk MA-Eastern Norfolk MA-Northwest Providence RI-
Including the cities of Foxborough, Norwood, Quincy, Foster, 
and Smithfield
348 AM EDT Fri Mar 31 2017

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 AM THIS
MORNING TO 8 AM EDT SATURDAY...

* LOCATIONS...Northwest Rhode Island and Norfolk county in 
  eastern Massachusetts.

* HAZARD TYPES...Snow and sleet with some pockets of freezing 
  rain possible across the hills of northwest Rhode Island.

* ACCUMULATIONS...Snow accumulation of 2 to 5 inches, along with 
  around a trace of ice.

* TIMING...A mixture of snow...sleet and rain will overspread the
  region between late this morning and early afternoon. The
  heaviest of the precipitation will arrive by this evening and
  overnight. The risk for accumulating sleet and snow peaks late
  this afternoon and again early tomorrow morning. Rain may mix in
  and limit accumulations overnight. Some of this rain may fall 
  as freezing rain as temperatures drop to around freezing 
  tonight.

* IMPACTS...Snow and ice accumulations will create treacherous 
  driving conditions and produce isolated brief power outages. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Winter Weather Advisory means that periods of snow, sleet, or
freezing rain will cause travel difficulties. Be prepared for
slippery roads and limited visibilities, and use caution while
driving.

&&

$$

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 winter storm watch 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 winter storm watch went out at Mar 29, 10:13 AM EDT, 5 hours 38 minutes earlier.

Area forecast discussion, Mar 29, 10:13 AM EDT, 5 hours 38 minutes before
Area Forecast Discussion
National Weather Service Taunton MA
1013 AM EDT Wed Mar 29 2017

.SYNOPSIS...

Rain has ended in New England, although clouds lingered at sunrise.
Expect a clearing trend through the day with dry weather continuing
through Thursday. Low pressure from the Ohio Valley passes S of New
England Saturday. This brings a mix of precipitation Friday and
Saturday. High pressure brings dry weather Sunday and Monday, followed
by another approaching storm on Tuesday.

&&

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

10 am update...

Mix of sun and clouds over much of S New England with blustery
NW winds.

Evaluating, fair amount of moisture within the H925-85 layer as
cyclonic flow prevails through which potent mid-level impulses
traverse. Just looking at high-res GOES-16 data, subsidence
behind the morning mid-level wave now moving S and offshore is
allowing for some partial clearing, but can see N and upstream
over the St Lawrence Valley the next wave coming S. The wave may
skirt S New England. However given cold air advection and the
anticipated boundary layer mixing of residual moisture beneath
increasing high pressure and dry-subsidence inversion that we
should see broken cloud decks lifting up around 5 kft agl.

As the prior forecaster mentioned, cold air cloudiness. Plus the
additional energy skirting S later today may touch off some light
shower activity. Prevailed light rain accordingly to linger along
the E coast. So all in all, am forecasting temperatures to be just
a degree or to lower for highs still anticipated around the upper
40s to low 50s.

Feeling a bit cooler. NW blustery winds gusting as high as 30 mph
especially along the high terrain and over the E coast beneath
the crux of heightened N/W winds within the low levels behind
the departing low. Going to feel roughly around 5 degrees colder.

&&

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

Overnight...

Clearing occurs during the evening hours as diurnal/CAA
cloudiness erodes. This will begin to allow some decoupling
although it may take until after midnight for most places to
drop to near calm as pres gradient remains relatively tight
through about 06Z. This will limit timing for radiational
cooling. Therefore, the floor for most overnight lows is in the
mid 20s, although a few spots (mainly the most sheltered
valleys) could drop a bit lower.

Thursday...

Another seasonable day for the most part although with generally
weaker winds. Gusts mainly hold 15-20 mph. Highs per slight
warming to an average of -4C at H85, look to remain in the upper
40s to around 50, although a few spots may do a bit better given
more sunshine and less in the way of diurnally driven clouds.

&&

.LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...

Big Picture...

Longwave flow is nearly west-east with a slight trough over the
Northeast USA.  Shortwave scale flow shows split northern and
southern jet streams directing at least three and possibly four
shortwaves through New England through early next week.

Model mass fields are similar through the weekend, then diverge late
in the forecast period with the approach of the next weather system
Tuesday. Pattern confidence is moderate through the weekend,
diminishing to low by Tuesday.

Details...

Thursday night...

High pressure over the region shifts east overnight. The overall
pattern suggests warm advection precip starting Friday morning. Even
so, the main system return flow continues to focus on NY/PA/NJ
through 12Z, even as the models move QPF across Southern New England
during 06Z to 12Z. Model omega fields show weak lift over the region
during late Thursday night, but RH fields show a dry layer below
this lift. All of this leads to concern that the models are
uniformly rushing pcpn in too soon. We have slowed the onset by a
few hours, but continue to bring chance pops to the Western Hills,
CT River Valley, and Central Hills overnight. Cold air damming
signal in the pressure pattern over the interior, and light
northerly low level ageostrophic flow. Within the context of chance
pops, we expect enough cold air for a snow ptype in the interior and
a rain/snow mix along the coastal plain.

Friday through Saturday...

Models agree on closed low over Illinois/Indiana Friday morning with
surface low over the Midwest. The Midwest low is forecast to
redevelop along the Mid Atlantic coast, likely in response to the
cold air over interior New England.

Strong low level southerly jet at 45-50 knots in the Ohio Valley
into Western NY.  Meanwhile southerly flow into New England is quite
light Friday morning, then slowly increases through the afternoon.
The stronger 25-45 knot onshore flow waits until late in the day and
during Friday night as the coastal low develops. Stronger winds
develop aloft and move over the South Coast and southern waters
Friday night and Saturday morning. There is concern that the models
are not fully accounting for the potential that this wind reaches
the surface at that time. Expect greater confidence for precip
Friday night and Saturday morning.

We will feature increasing pops through the day Friday with highest
values Friday night and Saturday as the coastal redevelopment passes
offshore.

Increasing low level ageostrophic flow from the north during the
afternoon and night...reaching 25-35 knots at night. This should
maintain and build low level cold air for Friday night. This builds
confidence in a snow/ice event for the interior, while the onshore
easterly wind keeps coastal areas above freezing.  There is
potential for several inches of accumulation inland, especially in
northern/western Massachusetts.

Sunday and Monday...

Northern stream shortwave moves overhead and carries an appreciable
cold pool aloft, especially over Northeast MA. Meanwhile the surface
layer shows less cold advection than aloft. So with clearing skies
mixing should bring temps into the 40s and near 50. This combination
should destabilize the airmass and support diurnal cumulus during
Sunday. It is possible we are underestimating the sky cover for
Sunday...this will depend on the amount of lingering moisture for
clouds.

High pressure and lighter wind will move in for Monday with sunny
skies.  Mixing will support max sfc temps in the upper 40s and lower
50s.

Tuesday...

Low pressure ejecting from the Southwest USA is projected to
approach our area on Tuesday. This system bears some similarity to
the Friday-Saturday system, including a cold air damming signal and
a coastal redevelopment.  This could be another coastal rain/inland
mix situation, but currently expected temperatures support all rain.
Much too early to lock onto a solution for this.

&&

.AVIATION /14Z WEDNESDAY THROUGH SUNDAY/...

Forecaster Confidence Levels...

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

Short Term /through Thursday/...

15z update...

Today...
IFR cigs lifting to low-end VFR SCT-BKN around 5 kft agl. With
IFR cigs -DZ may accompanying. Increasing NW winds. Gusts up to
30 kts towards evening into the overnight as cigs erode.

Thursday...High confidence.
VFR. NW flow weaker than today.

KBOS TAF...Improving cigs through the day with increasing NW flow.

KBDL TAF...Improving cigs through the day with increasing NW flow.

Outlook /Thursday Night through Sunday/...

Thursday night through Saturday...Moderate confidence.

VFR Thursday evening will lower to MVFR Friday and IFR/LIFR Friday
night and Saturday. Inland areas will see a rain/snow mix Friday
change to snow/sleet/freezing rain Friday night with several inches
of snow/sleet possible in the Western and Central Hills. More likely
rain in the coastal plain with a period of snow/rain mix Friday
night. Precipitation tapers off west to east Saturday afternoon.
Gusty easterly winds in the coastal plain Friday night and Saturday,
becoming northerly Saturday night.

Sunday...Moderate confidence.

Conditions trend to VFR with at least partial clearing. Northwest
winds with gusts 20 knots or less.

&&

.MARINE...

Forecaster Confidence Levels...

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

Short Term /through Thursday/...

10 am update...No major changes to the forecast.

Today and tonight...High confidence.

Winds will increase across the waters through the day, but will
peak by late this afternoon and early in the overnight. NW gusts
at peak will reach 25-30 mph with a few gusts just shy of gales.
Seas increase with this wind as well, peaking early Thu morning
at 8-10ft on the SE ocean waters. Small craft advisories remain
as issued.

Thu...High confidence.
NW winds diminish and waves slacken through the day. Small craft
advisories are likely to be dropped through the daylight hours.

Outlook /Thursday Night through Sunday/...

Thursday night... High confidence.

Lingering 5 foot seas on the outer waters.  Diminishing wind as high
pressure builds in.  A Small Craft Advisory is possible for leftover
seas Thursday evening.

Friday-Saturday...Moderate confidence.

Midwest weather system redevelops along the Mid Atlantic coast
Friday night and passes the waters on Saturday. Winds remain below
25 knots Friday, but become east and may increase to 30 knots Friday
night and Saturday. Winds turn from the north as the system moves
past. Expect seas to build Friday night and Saturday with heights 5
to 10 feet possible.

Winds of 40-50 knots are possible aloft, about 2000-3000 feet above
the surface.  There is at least a low concern for 35 knot gusts
Friday night and Saturday primarily over the southern waters.

Sunday...Moderate confidence.

Low pressure moves away from New England, with diminishing winds
over the waters.  Lingering 5-6 foot seas on the outer waters may
require a Small Craft Advisory there.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...

CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 2 PM EDT Thursday for ANZ231>234-
     251.
     Small Craft Advisory from 5 PM this afternoon to 8 AM EDT
     Thursday for ANZ230.
     Small Craft Advisory from 8 PM this evening to 8 AM EDT
     Thursday for ANZ235>237.
     Small Craft Advisory until 8 PM EDT Thursday for ANZ250-254.
     Small Craft Advisory until 2 PM EDT Thursday for ANZ255-256.

&&

SYNOPSIS...WTB/Doody
NEAR TERM...WTB/Doody/Sipprell
SHORT TERM...Doody
LONG TERM...WTB
AVIATION...WTB/Doody/Sipprell
MARINE...WTB/Doody/Sipprell
Hazardous weather outlook, Mar 29, 7:46 AM EDT, 8 hours 5 minutes before
Hazardous Weather Outlook
National Weather Service Taunton MA
746 AM EDT Wed Mar 29 2017

CTZ002>004-MAZ002>024-026-RIZ001>008-301200-
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-
746 AM EDT Wed Mar 29 2017

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

.DAY ONE...Today and Tonight.

Hazardous weather is not expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Late Thursday night into Saturday...There is a moderate risk of
plowable snow across the higher elevations of central and western
Massachusetts. Light ice accumulations are also possible Friday
night.

In addition, there is a low risk of splashover along east facing
coastlines during the high tide Saturday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ230>237-250-251-254>256-301200-
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-
746 AM EDT Wed Mar 29 2017

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

.DAY ONE...Today and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Friday night and Saturday...There is a low risk of easterly gales,
mainly along the waters south of Massachusetts and Rhode Island.

.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

Nearby

Winter Storm Watches in Massachusetts, 2017Every winter storm watch in 2017

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.