Alert archive / Massachusetts / Winter Storm Watches in 2021
Winter Storm Watch 5, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this winter storm watch at Feb 16, 2021, 3:38 PM EST for Capitol Planning Region, Northeastern Connecticut Planning Region, Connecticut; 10 counties in Massachusetts; 5 counties in Rhode Island. It took effect at Feb 18, 2021, 7:00 AM EST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 16, 2021, 3:38 PM EST (20:38 UTC)
- In effect from
- Feb 18, 2021, 7:00 AM EST
- Expired
- Feb 17, 2021, 3:37 PM EST
- In force
- Issued by
- NWS Boston/Norton, MA
Counties Capitol Planning Region, CT, Northeastern Connecticut Planning Region, CT, Bristol County, MA, Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex 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), 43 km from the middle of the area, began a volume at 20:41 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, 8.6 hours before the alert went out and 145 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
- 599 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 523 m²/s²
- 0-3 km storm-relative helicity
- 591 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
014 WWUS41 KBOX 162038 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 338 PM EST Tue Feb 16 2021 CTZ002>004-MAZ002>021-026-RIZ001>007-170445- /O.NEW.KBOX.WS.A.0005.210218T1200Z-210220T0000Z/ 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-Northern Middlesex MA- Northwest Providence RI-Southeast Providence RI-Western Kent RI- Eastern Kent RI-Bristol RI-Washington RI-Newport RI- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Charlemont, Greenfield, Orange, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, Foxborough, Norwood, Cambridge, Boston, Quincy, Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Ayer, Foster, Smithfield, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, and Newport 338 PM EST Tue Feb 16 2021 ...WINTER STORM WATCH IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY EVENING... * WHAT...Heavy mixed precipitation possible. Total snow accumulations of 4 to 7 inches and ice accumulations of a light glaze possible. * WHERE...Northern Connecticut, Rhode Island, and most of Massachusetts except Cape Cod and Islands. * WHEN...From Thursday morning through Friday evening. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
3 follow-up statements
248 WWUS41 KBOX 170315 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 1015 PM EST Tue Feb 16 2021 CTZ002>004-MAZ002>021-026-RIZ001>007-171000- /O.CON.KBOX.WS.A.0005.210218T1200Z-210220T0000Z/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA- Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA- Western Essex MA-Eastern Essex MA-Western Hampshire MA- Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA- Suffolk MA-Eastern Norfolk MA-Northern Bristol MA- Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA- Southern Plymouth MA-Northern Middlesex MA- Northwest Providence RI-Southeast Providence RI-Western Kent RI- Eastern Kent RI-Bristol RI-Washington RI-Newport RI- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Charlemont, Greenfield, Orange, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, Foxborough, Norwood, Cambridge, Boston, Quincy, Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Ayer, Foster, Smithfield, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, and Newport 1015 PM EST Tue Feb 16 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY EVENING... * WHAT...Heavy snow and mixed wintry precipitation possible. Total snow accumulations of 4 to 7 inches and ice accumulations of a light glaze possible. * WHERE...Northern Connecticut, Rhode Island, and most of Massachusetts except Cape Cod and Islands. * WHEN...From Thursday morning through Friday evening. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
155 WWUS41 KBOX 170903 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 403 AM EST Wed Feb 17 2021 CTZ002>004-MAZ002>021-026-RIZ001>007-172215- /O.CON.KBOX.WS.A.0005.210218T1200Z-210220T0000Z/ 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-Northern Middlesex MA- Northwest Providence RI-Southeast Providence RI-Western Kent RI- Eastern Kent RI-Bristol RI-Washington RI-Newport RI- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Charlemont, Greenfield, Orange, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, Foxborough, Norwood, Cambridge, Boston, Quincy, Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Ayer, Foster, Smithfield, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, and Newport 403 AM EST Wed Feb 17 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM THURSDAY MORNING THROUGH FRIDAY EVENING... * WHAT...Potential snow accumulations of 4 to 8 inches. * WHERE...Northern Connecticut, Rhode Island, and most of Massachusetts except Cape Cod and Islands. * WHEN...From Thursday morning through Friday evening. * IMPACTS...Travel could be difficult. The hazardous conditions could impact the morning or evening commute Thursday and Friday. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
954 WWUS41 KBOX 172037 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 337 PM EST Wed Feb 17 2021 CTZ002>004-MAZ002>021-026-RIZ001>007-180945- /O.UPG.KBOX.WS.A.0005.210218T1200Z-210220T0000Z/ /O.NEW.KBOX.WW.Y.0012.210218T1700Z-210220T0000Z/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA- Eastern Franklin MA-Northern Worcester MA-Central Middlesex MA- Western Essex MA-Eastern Essex MA-Western Hampshire MA- Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Southern Worcester MA-Western Norfolk MA-Southeast Middlesex MA- Suffolk MA-Eastern Norfolk MA-Northern Bristol MA- Western Plymouth MA-Eastern Plymouth MA-Southern Bristol MA- Southern Plymouth MA-Northern Middlesex MA- Northwest Providence RI-Southeast Providence RI-Western Kent RI- Eastern Kent RI-Bristol RI-Washington RI-Newport RI- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Charlemont, Greenfield, Orange, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, Foxborough, Norwood, Cambridge, Boston, Quincy, Taunton, Brockton, Plymouth, Fall River, New Bedford, Mattapoisett, Ayer, Foster, Smithfield, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, Bristol, Narragansett, Westerly, and Newport 337 PM EST Wed Feb 17 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM NOON THURSDAY TO 7 PM EST FRIDAY... * WHAT...Snow expected. Total snow accumulations of 5 to 7 inches. * WHERE...Portions of northern Connecticut, central, eastern, northeastern, southeastern and western Massachusetts and northern and southern Rhode Island. * WHEN...From noon Thursday to 7 PM EST Friday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ MAZ022>024-RIZ008-180945- /O.NEW.KBOX.WW.Y.0012.210218T1700Z-210220T0000Z/ Barnstable MA-Dukes MA-Nantucket MA-Block Island RI- Including the cities of Chatham, Falmouth, Provincetown, Vineyard Haven, Nantucket, and New Shoreham 337 PM EST Wed Feb 17 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM NOON THURSDAY TO 7 PM EST FRIDAY... * WHAT...Mixed precipitation expected. Total snow accumulations of 4 to 6 inches and ice accumulations of a light glaze. Winds gusting as high as 35 mph. * WHERE...In Massachusetts, Barnstable, Dukes and Nantucket Counties. In Rhode Island, Block Island. * WHEN...From noon Thursday to 7 PM EST Friday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. 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 16, 3:47 PM EST | Gale Warning | BOX | 12 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.