Alert archive / Massachusetts / Winter Storm Watches in 2021
Winter Storm Watch 7, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this winter storm watch at Apr 15, 2021, 3:37 AM EDT for Middlesex County, Worcester County, Massachusetts. It took effect at Apr 15, 2021, 8:00 PM EDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Apr 15, 2021, 3:37 AM EDT (07:37 UTC)
- In effect from
- Apr 15, 2021, 8:00 PM EDT
- Expired
- Apr 15, 2021, 3:25 PM EDT
- In force
- Issued by
- NWS Boston/Norton, MA
Counties Middlesex County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 67 km from the middle of the area, began a volume at 07:37 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
Albany, NY (KALY), launched 00:00Z, 7.6 hours before the alert went out and 181 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
- 3 J/kg
- Mixed-layer CIN
- -76 J/kg
- Mixed-layer LCL
- 2373 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 32 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
613 WWUS41 KBOX 150737 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 337 AM EDT Thu Apr 15 2021 MAZ002-008-152045- /O.UPG.KBOX.WS.A.0006.210416T0000Z-210417T0000Z/ /O.NEW.KBOX.WS.W.0005.210416T0000Z-210417T0000Z/ Western Franklin MA-Western Hampshire MA- Including the cities of Charlemont and Chesterfield 337 AM EDT Thu Apr 15 2021 ...WINTER STORM WARNING IN EFFECT FROM 8 PM THIS EVENING TO 8 PM EDT FRIDAY... * WHAT...Heavy wet snow expected. Total snow accumulations of 5 to 8 inches with localized amounts up to 10 inches possible above 1500 feet. * WHERE...Western Franklin MA and Western Hampshire MA Counties. * WHEN...From 8 PM this evening to 8 PM EDT Friday. * IMPACTS...Travel could be very difficult. Some power outages are possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ009-152045- /O.UPG.KBOX.WS.A.0006.210416T0000Z-210417T0000Z/ /O.NEW.KBOX.WW.Y.0013.210416T0000Z-210417T0000Z/ Western Hampden MA- Including the city of Blandford 337 AM EDT Thu Apr 15 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 8 PM EDT FRIDAY... * WHAT...Wet snow expected. Total snow accumulations of 4 to 6 inches. * WHERE...Western Hampden MA County. * WHEN...From 8 PM this evening to 8 PM EDT Friday. * IMPACTS...Travel could be very difficult. A few power outages are possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ MAZ003-010-152045- /O.NEW.KBOX.WW.Y.0013.210416T0000Z-210417T0000Z/ Eastern Franklin MA-Eastern Hampshire MA- Including the cities of Greenfield, Orange, Amherst, and Northampton 337 AM EDT Thu Apr 15 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 8 PM EDT FRIDAY... * WHAT...Wet snow expected. Total snow accumulations of 2 to 5 inches. * WHERE...Eastern Franklin MA and Eastern Hampshire MA Counties. * WHEN...From 8 PM this evening to 8 PM EDT Friday. * IMPACTS...Travel could be very difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ MAZ004-026-152045- /O.NEW.KBOX.WS.A.0007.210416T0000Z-210417T0000Z/ Northern Worcester MA-Northern Middlesex MA- Including the cities of Barre, Fitchburg, and Ayer 337 AM EDT Thu Apr 15 2021 ...WINTER STORM WATCH IN EFFECT FROM THIS EVENING THROUGH FRIDAY EVENING... * WHAT...Heavy wet snow possible. Total snow accumulations of 4 to 7 inches possible with the highest amounts at or above 1000 feet. * WHERE...Northern Worcester MA and Northern Middlesex MA Counties. * WHEN...From this evening through Friday evening. * IMPACTS...Travel could be very difficult. Some power outages are possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ Frank
1 follow-up statement
483 WWUS41 KBOX 151925 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 325 PM EDT Thu Apr 15 2021 MAZ002-008-160900- /O.CON.KBOX.WS.W.0005.210416T0000Z-210417T0000Z/ Western Franklin MA-Western Hampshire MA- Including the cities of Charlemont and Chesterfield 325 PM EDT Thu Apr 15 2021 ...WINTER STORM WARNING REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 8 PM EDT FRIDAY... * WHAT...Heavy wet snow expected. Total snow accumulations of 5 to 8 inches with localized amounts of 10 inches possible above 1500 feet. * WHERE...Western Hampshire MA and Western Franklin MA Counties. * WHEN...From 8 PM this evening to 8 PM EDT Friday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ004-026-160900- /O.UPG.KBOX.WS.A.0007.210416T0000Z-210417T0000Z/ /O.EXB.KBOX.WW.Y.0013.210416T0000Z-210417T0600Z/ Northern Worcester MA-Northern Middlesex MA- Including the cities of Barre, Fitchburg, and Ayer 325 PM EDT Thu Apr 15 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 8 PM THIS EVENING TO 2 AM EDT SATURDAY... * WHAT...Wet snow expected. Total snow accumulations of 2 to 5 inches with localized amounts greater than 6 inches possible above 1000 feet. * WHERE...Northern Worcester MA and Northern Middlesex MA Counties. * WHEN...From 8 PM this evening to 2 AM EDT Saturday. * IMPACTS...Travel could be very difficult. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ MAZ003-009-010-160900- /O.CON.KBOX.WW.Y.0013.210416T0000Z-210417T0000Z/ Eastern Franklin MA-Western Hampden MA-Eastern Hampshire MA- Including the cities of Greenfield, Orange, Blandford, Amherst, and Northampton 325 PM EDT Thu Apr 15 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 8 PM EDT FRIDAY... * WHAT...Wet snow expected. Total snow accumulations of 2 to 5 inches. * WHERE...Western Hampden MA, Eastern Hampshire MA and Eastern Franklin MA Counties. * WHEN...From 8 PM this evening to 8 PM EDT 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. && $$ BL
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 3:37 AM EDT | Winter Storm Warning | BOX | Franklin, Hampshire, Middlesex, Worcester | 40 hr |
| Apr 15, 3:37 AM EDT | Winter Weather Advisory | BOX | Franklin, Hampden, Hampshire, Middlesex, Worcester | 40 hr |
| Apr 15, 3:40 AM EDT | Gale Warning | BOX | 48 hr |
Nearby
Winter Storm Watches in Massachusetts, 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.