Alert archive / Massachusetts / Winter Storm Warnings in 2025

Winter Storm Warning 1, NWS Boston/Norton, MA

January 18, 2025Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; 8 counties in Massachusetts; Providence County, Rhode Island

NWS Boston/Norton, MA issued this winter storm warning at Jan 18, 2025, 2:33 PM EST for Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; 8 counties in Massachusetts; Providence County, Rhode Island. It took effect at Jan 19, 2025, 1:00 PM EST. It was in force for 18 hr. 60 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued
Jan 18, 2025, 2:33 PM EST (19:33 UTC)
In effect from
Jan 19, 2025, 1:00 PM EST
Expired
Jan 20, 2025, 6:46 AM EST
In force
18 hr
Issued by
NWS Boston/Norton, MA

Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Providence County, RI

The radar

The Boston radar (KBOX), 67 km from the middle of the area, began a volume at 19:34 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.

What was reported inside it

TimeReportWhereRemark
Jan 19, 5:30 PM ESTSNOW 1Granville, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 1Granville, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 1Granville, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 1Granville, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 1Granville, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 1Granville, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 2.5Greenfield, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 2.5Greenfield, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 2.5Greenfield, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 2.5Greenfield, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 2.5Greenfield, MAReported by Trained Spotter.
Jan 19, 5:30 PM ESTSNOW 2.5Greenfield, MAReported by Trained Spotter.
Jan 19, 5:34 PM ESTSNOW 2.82 Nw Goshen, MAReported by Trained Spotter.
Jan 19, 5:34 PM ESTSNOW 2.82 Nw Goshen, MAReported by Trained Spotter.
Jan 19, 5:34 PM ESTSNOW 2.82 Nw Goshen, MAReported by Trained Spotter.
Jan 19, 5:34 PM ESTSNOW 2.82 Nw Goshen, MAReported by Trained Spotter.
Jan 19, 5:34 PM ESTSNOW 2.82 Nw Goshen, MAReported by Trained Spotter.
Jan 19, 5:34 PM ESTSNOW 2.82 Nw Goshen, MAReported by Trained Spotter.
Jan 19, 5:56 PM ESTSNOW 31 W Ashfield, MAReported by Amateur Radio.
Jan 19, 5:56 PM ESTSNOW 31 W Ashfield, MAReported by Amateur Radio.
Jan 19, 5:56 PM ESTSNOW 31 W Ashfield, MAReported by Amateur Radio.
Jan 19, 5:56 PM ESTSNOW 31 W Ashfield, MAReported by Amateur Radio.
Jan 19, 5:56 PM ESTSNOW 31 W Ashfield, MAReported by Amateur Radio.
Jan 19, 5:56 PM ESTSNOW 31 W Ashfield, MAReported by Amateur Radio.
Jan 19, 6:00 PM ESTSNOW 1.5Southwick, MAReported by Amateur Radio.
Jan 19, 6:00 PM ESTSNOW 1.5Southwick, MAReported by Amateur Radio.
Jan 19, 6:00 PM ESTSNOW 1.5Southwick, MAReported by Amateur Radio.
Jan 19, 6:00 PM ESTSNOW 1.5Southwick, MAReported by Amateur Radio.
Jan 19, 6:00 PM ESTSNOW 1.5Southwick, MAReported by Amateur Radio.
Jan 19, 6:14 PM ESTSNOW 1Athol, MA
Jan 19, 6:14 PM ESTSNOW 1Athol, MA
Jan 19, 6:14 PM ESTSNOW 1Athol, MA
Jan 19, 6:14 PM ESTSNOW 1Athol, MA
Jan 19, 6:14 PM ESTSNOW 1Athol, MA
Jan 19, 6:14 PM ESTSNOW 1Athol, MA
Jan 19, 6:29 PM ESTSNOW 21 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:29 PM ESTSNOW 21 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:29 PM ESTSNOW 21 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:29 PM ESTSNOW 21 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:29 PM ESTSNOW 21 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:44 PM ESTSNOW 4.51 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:44 PM ESTSNOW 4.51 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:44 PM ESTSNOW 4.51 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:44 PM ESTSNOW 4.51 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:44 PM ESTSNOW 4.51 Se Chesterfield, MAReported by Amateur Radio.
Jan 19, 6:50 PM ESTSNOW 1.31 W Holden, MAReported by Amateur Radio.
Jan 19, 6:50 PM ESTSNOW 1.31 W Holden, MAReported by Amateur Radio.
Jan 19, 6:50 PM ESTSNOW 1.31 W Holden, MAReported by Amateur Radio.
Jan 19, 6:50 PM ESTSNOW 1.31 W Holden, MAReported by Amateur Radio.
Jan 19, 6:50 PM ESTSNOW 1.31 W Holden, MAReported by Amateur Radio.
Jan 19, 7:00 PM ESTSNOW 1.9Southwick, MAReported by Amateur Radio.
Jan 19, 7:00 PM ESTSNOW 1.9Southwick, MAReported by Amateur Radio.
Jan 19, 7:00 PM ESTSNOW 1.9Southwick, MAReported by Amateur Radio.
Jan 19, 7:00 PM ESTSNOW 3Rowe, MAReported by Amateur Radio.
Jan 19, 7:00 PM ESTSNOW 3Rowe, MAReported by Amateur Radio.
Jan 19, 7:00 PM ESTSNOW 3Rowe, MAReported by Amateur Radio.
Jan 19, 7:13 PM ESTSNOW 4.51 W Ashfield, MAReported by Amateur Radio.
Jan 19, 7:13 PM ESTSNOW 4.51 W Ashfield, MAReported by Amateur Radio.
Jan 19, 7:13 PM ESTSNOW 4.51 W Ashfield, MAReported by Amateur Radio.
Jan 19, 7:13 PM ESTSNOW 4.51 W Ashfield, MAReported by Amateur Radio.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 7.6 hours before the alert went out and 170 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, Albany, NY at 12:00Z on 2025-01-18Temperature 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, Albany, NY at 12:00Z on 2025-01-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 124 square meters per square second.19395878Sfc1 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
1380 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
124 m²/s²
0-3 km storm-relative helicity
189 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

213 
WWUS41 KBOX 181933
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
233 PM EST Sat Jan 18 2025

CTZ002-003-MAZ002>012-014-026-190845-
/O.UPG.KBOX.WS.A.0001.250119T1700Z-250120T1200Z/
/O.NEW.KBOX.WS.W.0001.250119T1800Z-250120T1200Z/
Hartford CT-Tolland 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-Southeast
Middlesex MA-Northern Middlesex MA-
Including the cities of Framingham, Hartford, Charlemont,
Milford, Greenfield, Cambridge, Northampton, Blandford,
Chesterfield, Worcester, Lawrence, Lowell, Amherst, Barre,
Vernon, Ayer, Springfield, Union, Windsor Locks, Gloucester,
Fitchburg, and Orange
233 PM EST Sat Jan 18 2025

...WINTER STORM WARNING IN EFFECT FROM 1 PM SUNDAY TO 7 AM EST 
MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 4 and 
  8 inches with localized totals up to 10 inches.

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

* WHEN...From 1 PM Sunday to 7 AM EST Monday.

* IMPACTS...Travel could be very difficult. The hazardous conditions 
  could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency.

&&

$$

MAZ013-015-016-RIZ001-002-190845-
/O.EXB.KBOX.WS.A.0001.250119T1800Z-250120T1200Z/
Western Norfolk MA-Suffolk MA-Eastern Norfolk MA-Northwest
Providence RI-Southeast Providence RI-
Including the cities of Foster, Norwood, Foxborough, Quincy,
Smithfield, Boston, and Providence
233 PM EST Sat Jan 18 2025

...WINTER STORM WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY 
MORNING...

* WHAT...Heavy snow possible. Total snow accumulations between 4 and 
  8 inches possible.

* WHERE...Norfolk County, Providence County, and Suffolk MA.

* WHEN...From Sunday afternoon through Monday morning.

* IMPACTS...Roads, and especially bridges and overpasses, will 
  likely become slick and hazardous. Travel could be very difficult. 
  The hazardous conditions could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

CTZ004-190845-
/O.EXT.KBOX.WS.A.0001.250119T1800Z-250120T1200Z/
Windham CT-
Including the cities of Putnam and Willimantic
233 PM EST Sat Jan 18 2025

...WINTER STORM WATCH NOW IN EFFECT FROM SUNDAY AFTERNOON THROUGH 
MONDAY MORNING...

* WHAT...Heavy snow possible. Total snow accumulations between 4 and 
  8 inches possible.

* WHERE...Windham CT County.

* WHEN...From Sunday afternoon through Monday morning.

* IMPACTS...Roads, and especially bridges and overpasses, will 
  likely become slick and hazardous. Travel could be very difficult. 
  The hazardous conditions could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Monitor the latest forecasts for updates on this situation.

&&

$$

Visit us at http://www.weather.gov/box

BW
4 follow-up statements
500 
WWUS41 KBOX 190642
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
142 AM EST Sun Jan 19 2025

CTZ004-MAZ013-015-016-RIZ001-002-191945-
/O.UPG.KBOX.WS.A.0001.250119T1800Z-250120T1200Z/
/O.EXA.KBOX.WS.W.0001.250119T1800Z-250120T1200Z/
Windham CT-Western Norfolk MA-Suffolk MA-Eastern Norfolk MA-
Northwest Providence RI-Southeast Providence RI-
Including the cities of Smithfield, Putnam, Foster, Quincy,
Norwood, Boston, Foxborough, Providence, and Willimantic
142 AM EST Sun Jan 19 2025

...WINTER STORM WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 AM 
EST MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 4 and 
  8 inches.

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

* WHEN...From 1 PM this afternoon to 7 AM EST Monday.

* IMPACTS...Travel could be very difficult. 1 to 2" per hour 
  snowfall rates are possible between 6 pm and midnight. The snow 
  will have come to an end in time for the early Monday morning 
  commute...but untreated roads will remain snow covered and 
  slippery with temperatures well below freezing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency.

&&

$$

CTZ002-003-MAZ002>012-014-026-191945-
/O.CON.KBOX.WS.W.0001.250119T1800Z-250120T1200Z/
Hartford CT-Tolland 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-Southeast
Middlesex MA-Northern Middlesex MA-
Including the cities of Cambridge, Greenfield, Lowell,
Framingham, Vernon, Springfield, Barre, Northampton, Gloucester,
Amherst, Ayer, Hartford, Chesterfield, Blandford, Milford,
Fitchburg, Windsor Locks, Union, Orange, Worcester, Lawrence, and
Charlemont
142 AM EST Sun Jan 19 2025

...WINTER STORM WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON 
TO 7 AM EST MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 4 and 
  8 inches with localized 10 inch amounts possible.

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

* WHEN...From 1 PM this afternoon to 7 AM EST Monday.

* IMPACTS...Travel could be very difficult. 1 to 2" per hour 
  snowfall rates are possible between 5 pm and midnight. The snow 
  will have come to an end in time for the early Monday morning 
  commute...but untreated roads will remain snow covered and 
  slippery with temperatures well below freezing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency.

&&

$$

MAZ017>021-RIZ003>007-191945-
/O.NEW.KBOX.WW.Y.0001.250119T1800Z-250120T1200Z/
Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-
Southern Bristol MA-Southern Plymouth MA-Western Kent RI-Eastern
Kent RI-Bristol RI-Washington RI-Newport RI-
Including the cities of West Warwick, West Greenwich, Fall River,
Bristol, Narragansett, East Greenwich, Newport, Plymouth,
Westerly, Taunton, Warwick, New Bedford, Coventry, Brockton, and
Mattapoisett
142 AM EST Sun Jan 19 2025

...WINTER WEATHER ADVISORY IN EFFECT FROM 1 PM THIS AFTERNOON TO 7 
AM EST MONDAY...

* WHAT...Snow expected which may begin as a brief period of rain. 
  Total snow accumulations between 3 and 6 inches.

* WHERE...Portions of southeastern Massachusetts and northern and 
  southern Rhode Island.

* WHEN...From 1 PM this afternoon to 7 AM EST Monday.

* IMPACTS...Travel could be very difficult. 1" per hour snowfall 
  rates are possible between 6 pm and midnight. The snow will have 
  come to an end in time for the early Monday morning commute...but 
  untreated roads will remain snow covered and slippery with 
  temperatures well below freezing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

&&

$$

Visit us at http://www.weather.gov/box

Frank
446 
WWUS41 KBOX 191941
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
241 PM EST Sun Jan 19 2025

CTZ002-003-MAZ002>012-014-026-200845-
/O.CON.KBOX.WS.W.0001.000000T0000Z-250120T1200Z/
Hartford CT-Tolland 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-Southeast
Middlesex MA-Northern Middlesex MA-
Including the cities of Ayer, Greenfield, Lawrence, Blandford,
Barre, Gloucester, Union, Fitchburg, Northampton, Amherst,
Lowell, Framingham, Windsor Locks, Charlemont, Hartford,
Cambridge, Springfield, Orange, Milford, Vernon, Chesterfield,
and Worcester
241 PM EST Sun Jan 19 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 AM EST MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 4 and 
  8 inches with localized 10 inch amounts possible.

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

* WHEN...Until 7 AM EST Monday.

* IMPACTS...Travel could be very difficult. The hazardous conditions 
  could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency.

&&

$$

CTZ004-MAZ013-015-016-RIZ001-002-200845-
/O.CON.KBOX.WS.W.0001.000000T0000Z-250120T1200Z/
Windham CT-Western Norfolk MA-Suffolk MA-Eastern Norfolk MA-
Northwest Providence RI-Southeast Providence RI-
Including the cities of Smithfield, Putnam, Norwood, Quincy,
Foxborough, Boston, Foster, Willimantic, and Providence
241 PM EST Sun Jan 19 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 AM EST MONDAY...

* WHAT...Heavy snow expected. Total snow accumulations between 4 and 
  8 inches.

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

* WHEN...Until 7 AM EST Monday.

* IMPACTS...Travel could be very difficult. The hazardous conditions 
  could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency.

&&

$$

MAZ017>021-RIZ003>007-200845-
/O.CON.KBOX.WW.Y.0001.000000T0000Z-250120T1200Z/
Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-
Southern Bristol MA-Southern Plymouth MA-Western Kent RI-Eastern
Kent RI-Bristol RI-Washington RI-Newport RI-
Including the cities of Warwick, Bristol, Newport, Fall River,
Coventry, West Greenwich, New Bedford, West Warwick, Taunton,
Westerly, Plymouth, East Greenwich, Brockton, Narragansett, and
Mattapoisett
241 PM EST Sun Jan 19 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 AM EST MONDAY...

* WHAT...Snow expected which may begin as a brief period of rain. 
  Total snow accumulations between 3 and 6 inches.

* WHERE...Portions of southeastern Massachusetts and northern and 
  southern Rhode Island.

* WHEN...Until 7 AM EST Monday.

* IMPACTS...Travel could be very difficult. The hazardous conditions 
  could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

&&

$$

Visit us at http://www.weather.gov/box

BW
708 
WWUS41 KBOX 200622
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
122 AM EST Mon Jan 20 2025

CTZ002-003-MAZ002>012-014-026-201200-
/O.CON.KBOX.WS.W.0001.000000T0000Z-250120T1200Z/
Hartford CT-Tolland 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-Southeast
Middlesex MA-Northern Middlesex MA-
Including the cities of Lowell, Cambridge, Chesterfield,
Greenfield, Fitchburg, Springfield, Gloucester, Framingham,
Hartford, Amherst, Milford, Barre, Lawrence, Blandford, Windsor
Locks, Charlemont, Worcester, Union, Orange, Vernon, Northampton,
and Ayer
122 AM EST Mon Jan 20 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 AM EST THIS 
MORNING...

* WHAT...Heavy snow has ended. Light snow brings additional snow 
  accumulations up to one inch.

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

* WHEN...Until 7 AM EST this morning.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency.

&&

$$

CTZ004-MAZ013-015-016-RIZ001-002-201200-
/O.CON.KBOX.WS.W.0001.000000T0000Z-250120T1200Z/
Windham CT-Western Norfolk MA-Suffolk MA-Eastern Norfolk MA-
Northwest Providence RI-Southeast Providence RI-
Including the cities of Boston, Foster, Smithfield, Providence,
Foxborough, Quincy, Norwood, Putnam, and Willimantic
122 AM EST Mon Jan 20 2025

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 7 AM EST THIS 
MORNING...

* WHAT...Heavy snow has ended. Light snow brings additional snow 
  accumulations up to one inch.

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

* WHEN...Until 7 AM EST this morning.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If you must travel, keep an extra flashlight, food, and water in 
your vehicle in case of an emergency.

&&

$$

MAZ017>021-RIZ003>007-201200-
/O.CON.KBOX.WW.Y.0001.000000T0000Z-250120T1200Z/
Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-
Southern Bristol MA-Southern Plymouth MA-Western Kent RI-Eastern
Kent RI-Bristol RI-Washington RI-Newport RI-
Including the cities of Coventry, Brockton, Plymouth, West
Warwick, Fall River, Mattapoisett, New Bedford, West Greenwich,
Warwick, Narragansett, Bristol, East Greenwich, Taunton,
Westerly, and Newport
122 AM EST Mon Jan 20 2025

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 AM EST THIS 
MORNING...

* WHAT...Heavier snow has ended. Light snow will bring additional 
  snow accumulations up to one inch.

* WHERE...Portions of southeastern Massachusetts and northern and 
  southern Rhode Island.

* WHEN...Until 7 AM EST this morning.

* IMPACTS...Plan on slippery road conditions. The hazardous 
  conditions could impact the Monday morning commute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Slow down and use caution while traveling.

&&

$$

Visit us at http://www.weather.gov/box

Mensch
507 
WWUS41 KBOX 201146
WSWBOX

URGENT - WINTER WEATHER MESSAGE
National Weather Service Boston/Norton MA
646 AM EST Mon Jan 20 2025

CTZ002>004-MAZ002>016-026-RIZ001-002-201300-
/O.CAN.KBOX.WS.W.0001.000000T0000Z-250120T1200Z/
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 Middlesex MA-Northwest Providence RI-
Southeast Providence RI-
Including the cities of Hartford, Norwood, Fitchburg, Union,
Chesterfield, Foxborough, Gloucester, Vernon, Quincy, Orange,
Springfield, Foster, Charlemont, Worcester, Smithfield,
Providence, Barre, Windsor Locks, Northampton, Blandford, Ayer,
Willimantic, Milford, Lowell, Lawrence, Putnam, Greenfield,
Amherst, Boston, Framingham, and Cambridge
646 AM EST Mon Jan 20 2025

...WINTER STORM WARNING IS CANCELLED...

Snow has come to an end, but slippery road conditions will continue 
into the morning

$$

MAZ017>021-RIZ003>007-201300-
/O.CAN.KBOX.WW.Y.0001.000000T0000Z-250120T1200Z/
Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA-
Southern Bristol MA-Southern Plymouth MA-Western Kent RI-Eastern
Kent RI-Bristol RI-Washington RI-Newport RI-
Including the cities of Narragansett, Coventry, Fall River, West
Greenwich, Mattapoisett, Bristol, East Greenwich, New Bedford,
Taunton, West Warwick, Westerly, Brockton, Warwick, Plymouth, and
Newport
646 AM EST Mon Jan 20 2025

...WINTER WEATHER ADVISORY IS CANCELLED...

Snow has come to an end, but slippery road conditions will continue 
into the morning

$$

Visit us at http://www.weather.gov/box

KP

What forecasters said that day

The local office's own words before this winter storm 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 winter storm warning went out at Jan 18, 12:32 PM EST, 2 hours 1 minute earlier.

Area forecast discussion, Jan 18, 12:32 PM EST, 2 hours 1 minute before
Area Forecast Discussion
National Weather Service Boston/Norton MA
1232 PM EST Sat Jan 18 2025

.SYNOPSIS...
An approaching cold front will result in a southerly flow and
milder temperatures today with a period of rain showers
this afternoon into early evening. A wave of low pressure moving
in later Sunday and Sunday night will bring accumulating,
plowable snowfall to Southern New England, though the exact
forecast accumulations and precipitation types hinging on the
track and intensity of the low pressure system. This will be
followed by an arctic outbreak Monday into Wednesday with Wind
Chills likely dropping to between 5 and 15 below zero.
Temperatures moderate a bit by the end of the upcoming work
week...but there is a low risk for a period of snow late
Thursday night and Friday if low pressure tracks far enough
northwest.

&&

.NEAR TERM /THROUGH TONIGHT/...
11am update...

Very mild temperatures already being felt this morning with
temperatures currently in the low to mid 40s. Forecast remains
on track.

Previous Discussion...

Key Messages:

* Above normal temperatures and breezy conditions today.

* Rain showers develop in the afternoon, becoming more widespread by
  early evening.

Today:

A weak shortwave trough and cold front approaches the region today.
Moisture gradually increases into the afternoon with precipitable
water values around 180-220% of normal by early evening. This wave
will bring a broad area of ascent supporting our next chance of
precipitation. Showers arrive early afternoon, spreading from west
to east, becoming more widespread mid-afternoon to early evening.

There will will be a good amount of WAA advection ahead of this
system with 850mb temperatures warming 5-8C from Friday bringing
highs into the 40s, potentially 50 in spots. This will put us around
6-12 degrees warmer than normal. That means this will fall as rain
with the exception of the Berkshires who may see light snow or a
rain/snow mix at times. It will also be breezy with a low level
jet/enhanced gradient positioned across the region. No impactful
winds are expected, but gusts 20-30 mph are possible.

Tonight:

Rain decreases from west to east this evening. A cold front moves
through shifting winds to the NW. Temperatures drop into the mid 20s
to low 30s across the interior and low to mid 30s closer to the
coast.

&&

.SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/...
Key Messages...

* Plowable snow late Sun/Sun night...Amounts/Ptype Issues Uncertain

* Winter Storm Watch NW of I-95 where the greatest risk of 4-8"

* Two Main Camps...
- Stronger/NW Track...Heavy Snow interior/Ptype issues coastal plain
- Weaker/SE Track...Mainly Snow northwest of Cape but lighter amounts

Details...

Sunday and Sunday night...

The first half of Sunday will feature dry weather with even partial
sunshine in the morning. The airmass is not initially that cold...so
with just a period of sunshine highs probably top off in the upper
30s to the middle 40s with the mildest readings across parts of
RI/SE MA.

The main forecast challenge continues to be the likelihood of a
plowable snowfall late Sun into Sun night for much of the region.
Precipitation should develop by mid to late Sunday
afternoon...roughly between 2 and 6 pm continuing into Sunday night.
However...there remains tremendous spread amongst the models and
potential specific outcomes. We will break it down more below.

An anafrontal wave of low pressure in the Carolinas early Sun
morning will race northeastward. However...there is still
significant model differences on the track and intensity of the wave
of low pressure. The RGEM has continually been the strongest and
furthest northwest with this low pressure system. In fact...the
system tracks so close to the coast that Ptype would mainly be rain
across eastern MA/RI with heavy snow of 6"+ across the interior.
Meanwhile...the ECMWF and NAM have tended to be weaker and further
southeast with this low pressure system. This results in a colder
solution but with less QPF...so while Ptype would mainly be snow
northwest of the Cape Cod Canal it would be more of an advisory type
of event. The GFS/UKMET lean more towards the more amped up
solutions...albeit not quite as extreme as the RGEM. While there is
not a classic closed mid level low...the more amped solutions do
indicate a closed 850 mb low which would support at least a brief
period of strong frontogenesis/good ratio type of snow. This would
result in a period of 1-2" per hour snowfall rates for a short
duration if it materialized.

Given the uncertainty that remains...we continue to blend a lot of
the guidance. We are thinking that this is a borderline Winter
Weather Advisory/Low End Winter Storm Warning. Thinking the greatest
risk for 4-8" of snow is to the northwest of I-95. The storm is
fairly progressive..but if enough banding were to develop a low risk
would exist for localized 10" snow amounts. Overall..we did not make
too many changes to the going forecast other than to expand the
Winter Storm Watch into northeast MA. Now if some of the more amped
up solutions tick a bit further southeast...later shifts may have to
consider expanding the Winter Storm Watches a bit further southeast.
Not enough confidence to do that right now given potential Ptype
issues with a stronger/further northwest track. At the same
time...the weaker more strung out solutions like the NAM/ECMWF would
result in Ptype being mainly snow northwest of the Cape Cod
Canal...but more of a 2-5"/3-6" event for a large chunk of our area.

So in a nutshell...this event looks to be right on the cusp between
a Winter Weather Advisory/Winter Storm Warning setup. Again...we
opted to go with a Watch northwest of I-95...which should give later
shifts more flexibility in converting to an Advisory or upgrading to
a warning. The good news is that the accumulating snow will have
come to an end in time for the Monday morning commute.
However...temps well below freezing should result in untreated roads
being snow covered and slippery.

&&

.LONG TERM /MONDAY THROUGH FRIDAY/...
Key Messages...

* Arctic Outbreak Mon through Wed with Wind Chills 5-15 below zero
* Lows Tue night/Wed night...single digits with some below zero
* Highs Tue & Wed only in the middle teens to the lower 20s
* Low probability for a period of snow late Thu night and/or Fri

Details...

Monday through Wednesday...

The good news is that the steady snow will pretty much be over by
daybreak Mon. Otherwise, the main story will be an arctic outbreak
and likely the coldest weather since early February 2023! The arctic
airmass begins to work into the region Mon on blustery NW winds.
Highs on Mon probably mainly in the lower to middle 20s with the
bitterly cold air works into the region late Mon/Mon night and
continuing into Wed. Overnight low temps will be in the single
digits Mon night and Tue night with some below zero readings in the
outlying locations...especially Tue night when winds start to
diminish. High temps Tue and Wed will only be in the middle teens to
the lower 20s. Blustery Northwest winds will probably drop Wind
Chills into the 5 to 15 below zero. Cold Weather Advisories will
likely be needed.

Thursday and Friday...

The core of the coldest air will begin to depart on Thu...but temps
should still be well below normal with highs mainly in the 20s. We
also will need to watch for a low probability for a period of snow
late Thu night into Fri. The majority of the guidance keeps this
next wave of low pressure to the south of our region and we would
remain dry. However...a few EPS/GEFS/CMC Ensembles track the system
further northwest which would bring a period of snow to the region
sometime late Thu night and/or Fri. We will likely need several more
days until things become more clear. Much of the region may see
highs finally break 30 by Fri.

&&

.AVIATION /18Z SATURDAY THROUGH WEDNESDAY/...
Forecast Confidence Levels:

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

18z TAF Update:

This afternoon...High Confidence in trends. Moderate Confidence
in timing.

Mix of VFR/MVFR ceilings gradually become more MVFR in the
afternoon and early evening. IFR conditions possible by early
evening. Rain showers overspread the region during the afternoon
hours from west to east.

Tonight...High Confidence in trends. Moderate Confidence in
timing of ceiling improvements.

Rain ends 01-05Z with ceilings slowly improving from west to
east tonight. MVFR to IFR ceilings to start the evening,
becoming VFR by 12Z, perhaps slightly later for the Cape.

Sunday...High Confidence in trends.

VFR ceilings through the afternoon. Winds W becoming NWW less
than 10 kts. Snow or rain/snow increases from west to east
after 18z.

Sunday night...low to moderate confidence.

IFR/MVFR in SN for most of the overnight hours, ending from west
to east 08-14z, improving to VFR behind. N winds becoming NW 10
to 15 kts, gusting 20 to 25 kts for most terminals.

KBOS TAF...High Confidence in TAF.

KBDL TAF...High Confidence in TAF.

Outlook /Monday through Wednesday/...

Sunday Night: Mainly IFR, with local MVFR possible. Breezy.
Chance SN, patchy FG.

Martin Luther King Jr Day through Wednesday: VFR. Breezy.

&&

.MARINE...
Forecaster Confidence Levels:

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

High confidence.

S to SW winds increase Saturday with gusts 25-30 kts. Seas build
to 4-6 ft for the outer coastal waters. Small Craft Advisories
will be issued for the outer coastal waters for a period from
late Saturday morning into early Sunday morning. Winds/seas
gradually decrease toward midnight Saturday.

Outlook /Monday through Wednesday/...

Sunday Night: Moderate risk for Small Craft Advisory winds with
gusts up to 30 kt. Areas of rough seas. Chance of rain, chance
of snow, patchy fog. Areas of visibility 1 to 3 nm.

Martin Luther King Jr Day: Moderate risk for Small Craft
Advisory winds with gusts up to 30 kt. Rough seas up to 9 ft.
Freezing spray.

Monday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Areas of rough seas. Freezing spray. Local
visibility 1 to 3 nm.

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

Tuesday Night: Low risk for Small Craft Advisory winds with
gusts up to 25 kt. Seas locally approaching 5 ft. Freezing
spray, slight chance of snow showers. Areas of visibility 1 to
3 nm.

Wednesday: Low risk for Small Craft Advisory winds with gusts
up to 25 kt. Seas locally approaching 5 ft. Freezing spray,
slight chance of snow showers. Local visibility 1 to 3 nm.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...Winter Storm Watch from Sunday afternoon through Monday
     morning for CTZ002>004.
MA...Winter Storm Watch from Sunday afternoon through Monday
     morning for MAZ002>012-014-026.
RI...None.
MARINE...Small Craft Advisory until 7 PM EST this evening for
     ANZ230>237-251.
     Small Craft Advisory until 2 AM EST Sunday for ANZ250-254>256.

&&

SYNOPSIS...Frank/Mensch
NEAR TERM...BW/Mensch
SHORT TERM...Frank
LONG TERM...Frank
AVIATION...BW/Mensch
MARINE...Frank/Mensch

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 17, 8:11 PM ESTSmall Craft AdvisoryBOX30 hr

Nearby

Winter Storm Warnings in Massachusetts, 2025Winter Storm Warnings in Connecticut, 2025Winter Storm Warnings in Rhode Island, 2025Every winter storm warning in 2025

Sources

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