Alert archive / Massachusetts / Winter Storm Watches in 2021
Winter Storm Watch 3, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this winter storm watch at Feb 5, 2021, 3:27 PM EST for 12 counties in Massachusetts; Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; 5 counties in Rhode Island. It took effect at Feb 7, 2021, 7:00 AM EST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 5, 2021, 3:27 PM EST (20:27 UTC)
- In effect from
- Feb 7, 2021, 7:00 AM EST
- Expired
- Feb 6, 2021, 3:27 PM EST
- In force
- Issued by
- NWS Boston/Norton, MA
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Barnstable County, MA, Bristol County, MA, Dukes County, MA, Essex County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Nantucket County, MA, Norfolk County, MA, Plymouth County, MA, Suffolk County, MA, Worcester County, MA, Bristol County, RI, Kent County, RI, Newport County, RI, Providence County, RI, Washington County, RI
The radar
The Boston radar (KBOX), 22 km from the middle of the area, began a volume at 20:29 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, 8.5 hours before the alert went out and 121 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1311 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 100 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
952 WWUS41 KBOX 052027 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 327 PM EST Fri Feb 5 2021 MAZ017>024-RIZ002>008-060600- /O.NEW.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA- Southern Bristol MA-Southern Plymouth MA-Barnstable MA-Dukes MA- Nantucket MA-Southeast Providence RI-Western Kent RI- Eastern Kent RI-Bristol RI-Washington RI-Newport RI- Block Island RI- Including the cities of Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Chatham, Falmouth, Provincetown, Vineyard Haven, Nantucket, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, Newport, and New Shoreham 327 PM EST Fri Feb 5 2021 ...WINTER STORM WATCH IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY NIGHT... * WHAT...Heavy snow possible. Total snow accumulations of 4 to 8 inches possible. Winds could gust as high as 40 mph. * WHERE...Portions of southeastern Massachusetts and northern and southern Rhode Island. * WHEN...From Sunday morning through late Sunday night. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
4 follow-up statements
817 WWUS41 KBOX 060251 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 951 PM EST Fri Feb 5 2021 MAZ017>024-RIZ002>008-061100- /O.CON.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA- Southern Bristol MA-Southern Plymouth MA-Barnstable MA-Dukes MA- Nantucket MA-Southeast Providence RI-Western Kent RI- Eastern Kent RI-Bristol RI-Washington RI-Newport RI- Block Island RI- Including the cities of Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Chatham, Falmouth, Provincetown, Vineyard Haven, Nantucket, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, Newport, and New Shoreham 951 PM EST Fri Feb 5 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY NIGHT... * WHAT...Heavy snow possible. Total snow accumulations of 4 to 8 inches possible. Winds could gust as high as 40 mph. * WHERE...Portions of southeastern Massachusetts and northern and southern Rhode Island. * WHEN...From Sunday morning through late Sunday night. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
548 WWUS41 KBOX 060820 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 320 AM EST Sat Feb 6 2021 MAZ017>023-RIZ002>008-061630- /O.UPG.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ /O.NEW.KBOX.WS.W.0003.210207T1200Z-210208T0600Z/ Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA- Southern Bristol MA-Southern Plymouth MA-Barnstable MA-Dukes MA- Southeast Providence RI-Western Kent RI-Eastern Kent RI- Bristol RI-Washington RI-Newport RI-Block Island RI- Including the cities of Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Chatham, Falmouth, Provincetown, Vineyard Haven, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, Newport, and New Shoreham 320 AM EST Sat Feb 6 2021 ...WINTER STORM WARNING IN EFFECT FROM 7 AM SUNDAY TO 1 AM EST MONDAY... * WHAT...Heavy wet snow expected. Total snow accumulations of 5 to 9 inches. Winds gusting as high as 40 mph. * WHERE...Portions of southeastern Massachusetts as well as central and southern Rhode Island. * WHEN...From 7 AM Sunday to 1 AM EST Monday. Heaviest snow is expected Sunday afternoon with 1 to 2 hour snowfall rates possible a times. * IMPACTS...Travel will be very difficult. * ADDITIONAL DETAILS...Heavy wet snow may result in the potential for some power outages and downed tree limbs. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ CTZ002>004-MAZ004>016-026-RIZ001-061630- /O.EXA.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ Hartford CT-Tolland CT-Windham CT-Northern Worcester MA- Central Middlesex MA-Western Essex MA-Eastern Essex MA- Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA- Eastern Hampden MA-Southern Worcester MA-Western Norfolk MA- Southeast Middlesex MA-Suffolk MA-Eastern Norfolk MA- Northern Middlesex MA-Northwest Providence RI- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, Foxborough, Norwood, Cambridge, Boston, Quincy, Ayer, Foster, and Smithfield 320 AM EST Sat Feb 6 2021 ...WINTER STORM WATCH IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY NIGHT... * WHAT...Heavy snow possible. Total snow accumulations of 4 to 8 inches possible. * WHERE...Portions of northern Connecticut, central, eastern, northeastern and western Massachusetts and northern Rhode Island. * WHEN...From Sunday morning through late Sunday night. The heaviest snow will fall from late Sunday morning into Sunday afternoon. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ MAZ024-061630- /O.CON.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ Nantucket MA- Including the city of Nantucket 320 AM EST Sat Feb 6 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY NIGHT... * WHAT...Heavy wet snow possible which may mix with rain and sleet at times. Total snow accumulations of 4 to 7 inches possible. Winds could gust as high as 50 mph. * WHERE...Nantucket MA County. * WHEN...From Sunday morning through late Sunday night. * IMPACTS...Plan on slippery road conditions. Gusty winds and heavy wet snow could bring down tree branches and result in some power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ Frank
825 WWUS41 KBOX 061609 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 1109 AM EST Sat Feb 6 2021 MAZ017>023-RIZ002>008-070015- /O.CON.KBOX.WS.W.0003.210207T1200Z-210208T0600Z/ Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA- Southern Bristol MA-Southern Plymouth MA-Barnstable MA-Dukes MA- Southeast Providence RI-Western Kent RI-Eastern Kent RI- Bristol RI-Washington RI-Newport RI-Block Island RI- Including the cities of Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Chatham, Falmouth, Provincetown, Vineyard Haven, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, Newport, and New Shoreham 1109 AM EST Sat Feb 6 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 7 AM SUNDAY TO 1 AM EST MONDAY... * WHAT...Heavy wet snow expected. Total snow accumulations of 5 to 9 inches. Winds gusting as high as 40 mph. * WHERE...Portions of southeastern Massachusetts as well as central and southern Rhode Island. * WHEN...From 7 AM Sunday to 1 AM EST Monday. Heaviest snow is expected Sunday afternoon with 1 to 2 hour snowfall rates possible a times. * IMPACTS...Travel will be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ024-070015- /O.CON.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ Nantucket MA- Including the city of Nantucket 1109 AM EST Sat Feb 6 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY NIGHT... * WHAT...Heavy wet snow possible which may mix with rain and sleet at times. Total snow accumulations of 4 to 7 inches possible. Winds could gust as high as 50 mph. * WHERE...Nantucket MA County. * WHEN...From Sunday morning through late Sunday night. * IMPACTS...Plan on slippery road conditions. Gusty winds and heavy wet snow could bring down tree branches and result in some power outages. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ CTZ002>004-MAZ004>016-026-RIZ001-070015- /O.CON.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ Hartford CT-Tolland CT-Windham CT-Northern Worcester MA- Central Middlesex MA-Western Essex MA-Eastern Essex MA- Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA- Eastern Hampden MA-Southern Worcester MA-Western Norfolk MA- Southeast Middlesex MA-Suffolk MA-Eastern Norfolk MA- Northern Middlesex MA-Northwest Providence RI- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, Foxborough, Norwood, Cambridge, Boston, Quincy, Ayer, Foster, and Smithfield 1109 AM EST Sat Feb 6 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM SUNDAY MORNING THROUGH LATE SUNDAY NIGHT... * WHAT...Heavy snow possible. Total snow accumulations of 4 to 8 inches possible. * WHERE...Portions of northern Connecticut, central, eastern, northeastern and western Massachusetts and northern Rhode Island. * WHEN...From Sunday morning through late Sunday night. The heaviest snow will fall from late Sunday morning into Sunday afternoon. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
426 WWUS41 KBOX 062027 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 327 PM EST Sat Feb 6 2021 MAZ023-RIZ008-070830- /O.CAN.KBOX.WS.W.0003.210207T1200Z-210208T0600Z/ /O.NEW.KBOX.WW.Y.0008.210207T1200Z-210208T0600Z/ Dukes MA-Block Island RI- Including the cities of Vineyard Haven and New Shoreham 327 PM EST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 7 AM SUNDAY TO 1 AM EST MONDAY... ...WINTER STORM WARNING IS CANCELLED... * WHAT...Snow expected. Total snow accumulations of up to 6 inches. Winds gusting as high as 40 mph. * WHERE...In Massachusetts, Dukes MA County. In Rhode Island, Block Island RI County. * WHEN...From 7 AM Sunday to 1 AM EST Monday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ CTZ003-004-MAZ004>007-012>016-026-RIZ001-070830- /O.UPG.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ /O.EXA.KBOX.WS.W.0003.210207T1200Z-210208T0600Z/ Tolland CT-Windham CT-Northern Worcester MA-Central Middlesex MA- Western Essex MA-Eastern Essex MA-Southern Worcester MA- Western Norfolk MA-Southeast Middlesex MA-Suffolk MA- Eastern Norfolk MA-Northern Middlesex MA-Northwest Providence RI- Including the cities of Union, Vernon, Putnam, Willimantic, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Milford, Worcester, Foxborough, Norwood, Cambridge, Boston, Quincy, Ayer, Foster, and Smithfield 327 PM EST Sat Feb 6 2021 ...WINTER STORM WARNING IN EFFECT FROM 7 AM SUNDAY TO 1 AM EST MONDAY... * WHAT...Heavy wet snow expected. Total snow accumulations of 5 to 8 inches. * WHERE...Portions of northern Connecticut, central, eastern and northeastern Massachusetts and northern Rhode Island. * WHEN...From 7 AM Sunday to 1 AM EST Monday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Rain may mix in at times, especially near the immediate coast. Snowfall rates could reach 1 to 2 inches per hour at times during the afternoon hours. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ017>022-RIZ002>007-070830- /O.CON.KBOX.WS.W.0003.210207T1200Z-210208T0600Z/ Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA- Southern Bristol MA-Southern Plymouth MA-Barnstable MA- Southeast Providence RI-Western Kent RI-Eastern Kent RI- Bristol RI-Washington RI-Newport RI- Including the cities of Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Chatham, Falmouth, Provincetown, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, and Newport 327 PM EST Sat Feb 6 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 7 AM SUNDAY TO 1 AM EST MONDAY... * WHAT...Heavy wet snow expected. Total snow accumulations of 5 to 9 inches, except for the Outer Cape where only 1 to 3 inches of snow are expected. Winds gusting as high as 40 mph. * WHERE...Portions of southeastern Massachusetts as well as central and southern Rhode Island. * WHEN...From 7 AM Sunday to 1 AM EST Monday. Heaviest snow is expected Sunday afternoon with 1 to 2 hour snowfall rates possible at times. * IMPACTS...Travel will be very difficult. * ADDITIONAL DETAILS...Rain may mix in at times, especially near the immediate coast and over Cape Cod. The Outer Cape is expected to see mostly rain. Snowfall rates could reach 1 to 2 inches per hour at times during the afternoon hours where mixing doesn't occur. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ024-070830- /O.UPG.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ /O.NEW.KBOX.WW.Y.0008.210207T1200Z-210208T0600Z/ Nantucket MA- Including the city of Nantucket 327 PM EST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 7 AM SUNDAY TO 1 AM EST MONDAY... * WHAT...Wintry mix of rain and snow expected. Total snow accumulations of up to one inch. Winds gusting as high as 50 mph. * WHERE...Nantucket MA County. * WHEN...From 7 AM Sunday to 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. Gusty winds could bring down tree branches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ CTZ002-MAZ008>011-070830- /O.UPG.KBOX.WS.A.0003.210207T1200Z-210208T0600Z/ /O.NEW.KBOX.WW.Y.0008.210207T1200Z-210208T0600Z/ Hartford CT-Western Hampshire MA-Western Hampden MA- Eastern Hampshire MA-Eastern Hampden MA- Including the cities of Hartford, Windsor Locks, Chesterfield, Blandford, Amherst, Northampton, and Springfield 327 PM EST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 7 AM SUNDAY TO 1 AM EST MONDAY... * WHAT...Snow expected. Total snow accumulations of 4 to 6 inches. * WHERE...In Connecticut, Hartford CT County. In Massachusetts, Western Hampshire MA, Western Hampden MA, Eastern Hampshire MA and Eastern Hampden MA Counties. * WHEN...From 7 AM Sunday to 1 AM EST Monday. * IMPACTS...Travel could be very difficult. * ADDITIONAL DETAILS...Snowfall rates could reach 1 to 2 inches per hour at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ MAZ002-003-070830- /O.NEW.KBOX.WW.Y.0008.210207T1200Z-210208T0600Z/ Western Franklin MA-Eastern Franklin MA- Including the cities of Charlemont, Greenfield, and Orange 327 PM EST Sat Feb 6 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 7 AM SUNDAY TO 1 AM EST MONDAY... * WHAT...Snow expected. Total snow accumulations of 4 to 6 inches. * WHERE...Western Franklin MA and Eastern Franklin MA Counties. * WHEN...From 7 AM Sunday to 1 AM EST Monday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...Snowfall rates could reach 1 to 2 inches per hour at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 5, 3:43 AM EST | Gale Watch | BOX | 24 hr | |
| Feb 5, 3:43 AM EST | Small Craft Advisory | BOX | 36 hr |
Nearby
Winter Storm Watches in Massachusetts, 2021Winter Storm Watches in Rhode Island, 2021Winter Storm Watches in Connecticut, 2021Every winter storm watch in 2021
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.