Alert archive / Massachusetts / Winter Storm Warnings in 2021
Winter Storm Warning 4, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this winter storm warning at Feb 9, 2021, 1:59 AM EST for 6 counties in Massachusetts. It took effect at Feb 9, 2021, 4:00 AM EST. It was in force for 10 hr. 16 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
- Feb 9, 2021, 1:59 AM EST (06:59 UTC)
- In effect from
- Feb 9, 2021, 4:00 AM EST
- Expired
- Feb 9, 2021, 1:48 PM EST
- In force
- 10 hr
- Issued by
- NWS Boston/Norton, MA
Counties Essex County, MA, Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 89 km from the middle of the area, began a volume at 07:03 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
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 9, 10:46 AM EST | SNOW 1 | Longmeadow, MA | |
| Feb 9, 12:20 PM EST | SNOW 1.5 | Russell, MA | |
| Feb 9, 12:38 PM EST | SNOW 1.2 | Hampden, MA | |
| Feb 9, 12:48 PM EST | SNOW 1 | North Grafton, MA | |
| Feb 9, 12:59 PM EST | SNOW 1 | Holden, MA | |
| Feb 9, 1:00 PM EST | SNOW 1 | Holden, MA | |
| Feb 9, 1:00 PM EST | SNOW 1.9 | Springfield, MA | INDIAN ORCHARD |
| Feb 9, 1:08 PM EST | SNOW 1.9 | Springfield, MA | |
| Feb 9, 1:16 PM EST | SNOW 1.3 | Auburn, MA | |
| Feb 9, 1:25 PM EST | SNOW 1.2 | Northbridge, MA | |
| Feb 9, 1:30 PM EST | SNOW 1.3 | Northborough, MA | |
| Feb 9, 1:35 PM EST | SNOW 1.3 | Northborough, MA | |
| Feb 9, 1:35 PM EST | SNOW 1.6 | South Acton, MA | |
| Feb 9, 1:44 PM EST | SNOW 1.3 | Leominster, MA | |
| Feb 9, 1:48 PM EST | SNOW 1 | Cambridge, MA | |
| Feb 9, 1:56 PM EST | SNOW 1.4 | Lexington, MA |
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 00:00Z, 7.0 hours before the alert went out and 152 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
- 1506 m above ground
- 0-6 km bulk shear
- 116 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 292 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
455 WWUS41 KBOX 090659 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 159 AM EST Tue Feb 9 2021 MAZ002>012-014-026-091700- /O.UPG.KBOX.WW.Y.0009.210209T0900Z-210210T0300Z/ /O.NEW.KBOX.WS.W.0004.210209T0900Z-210210T0300Z/ Western Franklin MA-Eastern Franklin MA-Northern Worcester MA- Central Middlesex MA-Western Essex MA-Eastern Essex MA- Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA- Eastern Hampden MA-Southern Worcester MA-Southeast Middlesex MA- Northern Middlesex MA- Including the cities of Charlemont, Greenfield, Orange, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, Cambridge, and Ayer 159 AM EST Tue Feb 9 2021 ...WINTER STORM WARNING IN EFFECT UNTIL 10 PM EST THIS EVENING... * WHAT...Heavy snow expected. Total snow accumulations of 5 to 7 inches. * WHERE...Western and Central Massachusetts, the Merrimack Valley and North Shore in Massachusetts. * WHEN...Until 10 PM EST this evening. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. The worst conditions are expected with the evening commute. * ADDITIONAL DETAILS...Snowfall rates up to 1 inch per hour at times with reduced visibilities are expected to develop by mid- afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ017>019-RIZ003>005-091700- /O.EXA.KBOX.WW.Y.0009.210209T0900Z-210210T0300Z/ Northern Bristol MA-Western Plymouth MA-Eastern Plymouth MA- Western Kent RI-Eastern Kent RI-Bristol RI- Including the cities of Taunton, Brockton, Plymouth, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, and Bristol 159 AM EST Tue Feb 9 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 10 PM EST THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 2 to 4 inches. * WHERE...Much of southeastern Massachusetts and central Rhode Island. * WHEN...Until 10 PM EST this evening. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ CTZ002>004-MAZ013-015-016-RIZ001-002-091700- /O.CON.KBOX.WW.Y.0009.210209T0900Z-210210T0300Z/ Hartford CT-Tolland CT-Windham CT-Western Norfolk MA-Suffolk MA- Eastern Norfolk MA-Northwest Providence RI- Southeast Providence RI- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Foxborough, Norwood, Boston, Quincy, Foster, Smithfield, and Providence 159 AM EST Tue Feb 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 PM EST THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 3 to 5 inches. * WHERE...Northern Connecticut, Northern Rhode Island into Norfolk and Suffolk Counties in Massachusetts. * WHEN...Until 10 PM EST this evening. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the morning or evening commute. The worst conditions are expected during the evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ Loconto
2 follow-up statements
723 WWUS41 KBOX 091632 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 1132 AM EST Tue Feb 9 2021 MAZ002>012-014-026-100045- /O.CON.KBOX.WS.W.0004.000000T0000Z-210210T0300Z/ Western Franklin MA-Eastern Franklin MA-Northern Worcester MA- Central Middlesex MA-Western Essex MA-Eastern Essex MA- Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA- Eastern Hampden MA-Southern Worcester MA-Southeast Middlesex MA- Northern Middlesex MA- Including the cities of Charlemont, Greenfield, Orange, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, Cambridge, and Ayer 1132 AM EST Tue Feb 9 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 PM EST THIS EVENING... * WHAT...Heavy snow expected. Total snow accumulations of 3 to 6 inches. * WHERE...Western and Central Massachusetts, the Merrimack Valley and North Shore in Massachusetts. * WHEN...Until 10 PM EST this evening. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. The worst conditions are expected with the evening commute. * ADDITIONAL DETAILS...Snowfall rates up to 1 inch per hour at times with reduced visibilities are expected to develop by mid- afternoon. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ CTZ002>004-MAZ013-015>019-RIZ001>005-100045- /O.CON.KBOX.WW.Y.0009.000000T0000Z-210210T0300Z/ Hartford CT-Tolland CT-Windham CT-Western Norfolk MA-Suffolk MA- Eastern Norfolk MA-Northern Bristol MA-Western Plymouth MA- Eastern Plymouth MA-Northwest Providence RI- Southeast Providence RI-Western Kent RI-Eastern Kent RI- Bristol RI- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Foxborough, Norwood, Boston, Quincy, Taunton, Brockton, Plymouth, Foster, Smithfield, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, and Bristol 1132 AM EST Tue Feb 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 PM EST THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 2 to 4 inches. * WHERE...Much of southeastern Massachusetts and central Rhode Island. * WHEN...Until 10 PM EST this evening. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$
302 WWUS41 KBOX 091848 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 148 PM EST Tue Feb 9 2021 MAZ002>012-014-026-100300- /O.CAN.KBOX.WS.W.0004.000000T0000Z-210210T0300Z/ /O.EXA.KBOX.WW.Y.0009.000000T0000Z-210210T0300Z/ Western Franklin MA-Eastern Franklin MA-Northern Worcester MA- Central Middlesex MA-Western Essex MA-Eastern Essex MA- Western Hampshire MA-Western Hampden MA-Eastern Hampshire MA- Eastern Hampden MA-Southern Worcester MA-Southeast Middlesex MA- Northern Middlesex MA- Including the cities of Charlemont, Greenfield, Orange, Barre, Fitchburg, Framingham, Lowell, Lawrence, Gloucester, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, Cambridge, and Ayer 148 PM EST Tue Feb 9 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 10 PM EST THIS EVENING... ...WINTER STORM WARNING IS CANCELLED... * WHAT...Snow. Additional snow accumulations of up to two inches. * WHERE...Portions of central, eastern, northeastern and western Massachusetts. * WHEN...Until 10 PM EST this evening. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS... PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ CTZ002>004-MAZ013-015>019-RIZ001>005-100300- /O.CON.KBOX.WW.Y.0009.000000T0000Z-210210T0300Z/ Hartford CT-Tolland CT-Windham CT-Western Norfolk MA-Suffolk MA- Eastern Norfolk MA-Northern Bristol MA-Western Plymouth MA- Eastern Plymouth MA-Northwest Providence RI- Southeast Providence RI-Western Kent RI-Eastern Kent RI- Bristol RI- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Foxborough, Norwood, Boston, Quincy, Taunton, Brockton, Plymouth, Foster, Smithfield, Providence, Coventry, West Greenwich, East Greenwich, Warwick, West Warwick, and Bristol 148 PM EST Tue Feb 9 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 10 PM EST THIS EVENING... * WHAT...Snow expected. Total snow accumulations of 2 to 4 inches. * WHERE...Much of southeastern Massachusetts and central Rhode Island. * WHEN...Until 10 PM EST this evening. * IMPACTS...Plan on slippery road conditions. 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 9, 3:07 PM EST | Small Craft Advisory | BOX | 19 hr |
Nearby
Winter Storm Warnings in Massachusetts, 2021Every winter storm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.