Alert archive / Massachusetts / Winter Weather Advisories in 2021
Winter Weather Advisory 13, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this winter weather advisory at Apr 15, 2021, 3:37 AM EDT for 5 counties in Massachusetts. It took effect at Apr 15, 2021, 8:00 PM EDT. It was in force for 24 hr.
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 16, 2021, 8:00 PM EDT
- In force
- 24 hr
- Issued by
- NWS Boston/Norton, MA
Counties Franklin County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Worcester County, MA
The radar
The Boston radar (KBOX), 102 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 135 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
5 follow-up statements
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. && $$ BL
817 WWUS41 KBOX 160130 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 930 PM EDT Thu Apr 15 2021 MAZ004-026-161430- /O.UPG.KBOX.WW.Y.0013.000000T0000Z-210417T0600Z/ /O.EXA.KBOX.WS.W.0005.000000T0000Z-210417T0000Z/ Northern Worcester MA-Northern Middlesex MA- Including the cities of Barre, Fitchburg, and Ayer 930 PM EDT Thu Apr 15 2021 ...WINTER STORM WARNING IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Heavy wet snow. Total snow accumulations of 4 to 8 inches with the higher of those amounts at elevations near or above 1000 feet. * WHERE...Northern Worcester MA and Northern Middlesex MA Counties. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Travel could be very difficult. Some power outages are possible due to the wet nature of the snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ002-008-161430- /O.CON.KBOX.WS.W.0005.000000T0000Z-210417T0000Z/ Western Franklin MA-Western Hampshire MA- Including the cities of Charlemont and Chesterfield 930 PM EDT Thu Apr 15 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 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...Until 8 PM EDT Friday. * IMPACTS...Travel could be very difficult. Some power outages are possible due to the wet nature of the snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ003-009-010-161430- /O.CON.KBOX.WW.Y.0013.000000T0000Z-210417T0000Z/ Eastern Franklin MA-Western Hampden MA-Eastern Hampshire MA- Including the cities of Greenfield, Orange, Blandford, Amherst, and Northampton 930 PM EDT Thu Apr 15 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT FRIDAY... * WHAT...Wet snow. Total snow accumulations of 2 to 5 inches. * WHERE...Western Hampden MA, Eastern Hampshire MA and Eastern Franklin MA Counties. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Travel could be difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ Frank
813 WWUS41 KBOX 160741 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 341 AM EDT Fri Apr 16 2021 MAZ002-008-162045- /O.CON.KBOX.WS.W.0005.000000T0000Z-210417T0000Z/ Western Franklin MA-Western Hampshire MA- Including the cities of Charlemont and Chesterfield 341 AM EDT Fri Apr 16 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heavy wet snow expected. Total snow accumulations of 3 to 8 inches with localized 10 inch amounts possible above 1500 feet. * WHERE...Western Hampshire MA and Western Franklin MA Counties. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Travel could be very difficult. Some power outages are possible due to the wet nature of the snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ004-026-162045- /O.CON.KBOX.WS.W.0005.000000T0000Z-210417T0000Z/ Northern Worcester MA-Northern Middlesex MA- Including the cities of Barre, Fitchburg, and Ayer 341 AM EDT Fri Apr 16 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heavy wet snow. Total snow accumulations of 3 to 8 inches with localized 10 inch amounts possible at elevations over 1000 feet. * WHERE...Northern Worcester MA and Northern Middlesex MA Counties. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Travel could be very difficult. Some power outages are possible due to the wet nature of the snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ003-009-010-162045- /O.CON.KBOX.WW.Y.0013.000000T0000Z-210417T0000Z/ Eastern Franklin MA-Western Hampden MA-Eastern Hampshire MA- Including the cities of Greenfield, Orange, Blandford, Amherst, and Northampton 341 AM EDT Fri Apr 16 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Wet snow. Total snow accumulations of 2 to 5 inches. * WHERE...Western Hampden MA, Eastern Hampshire MA and Eastern Franklin MA Counties. * WHEN...Until 8 PM EDT Friday. * IMPACTS...Travel could be difficult. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$ Frank
745 WWUS41 KBOX 161937 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 337 PM EDT Fri Apr 16 2021 MAZ002-008-170000- /O.CON.KBOX.WS.W.0005.000000T0000Z-210417T0000Z/ Western Franklin MA-Western Hampshire MA- Including the cities of Charlemont and Chesterfield 337 PM EDT Fri Apr 16 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heavy snow. Additional snow accumulations of up to two inches. * WHERE...Western Hampshire MA and Western Franklin MA Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ004-026-170000- /O.CON.KBOX.WS.W.0005.000000T0000Z-210417T0000Z/ Northern Worcester MA-Northern Middlesex MA- Including the cities of Barre, Fitchburg, and Ayer 337 PM EDT Fri Apr 16 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Heavy snow. Additional snow accumulations of up to two inches. * WHERE...Northern Worcester MA and Northern Middlesex MA Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. && $$ MAZ003-009-010-170000- /O.CON.KBOX.WW.Y.0013.000000T0000Z-210417T0000Z/ Eastern Franklin MA-Western Hampden MA-Eastern Hampshire MA- Including the cities of Greenfield, Orange, Blandford, Amherst, and Northampton 337 PM EDT Fri Apr 16 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING... * WHAT...Snow. Additional snow accumulations of up to one inch. * WHERE...Western Hampden MA, Eastern Hampshire MA and Eastern Franklin MA Counties. * WHEN...Until 8 PM EDT this evening. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. && $$
846 WWUS41 KBOX 162355 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 755 PM EDT Fri Apr 16 2021 MAZ002-008-170100- /O.EXP.KBOX.WS.W.0005.000000T0000Z-210417T0000Z/ Western Franklin MA-Western Hampshire MA- Including the cities of Charlemont and Chesterfield 755 PM EDT Fri Apr 16 2021 ...WINTER STORM WARNING WILL EXPIRE AT 8 PM EDT THIS EVENING... Precipitation continues to wind down as low pressure lifts offshore. There could be up to an additional half inch of accumulation before precipitation ends. Therefore, the Winter Storm Warning will be allowed to expire. $$ MAZ004-026-170100- /O.EXP.KBOX.WS.W.0005.000000T0000Z-210417T0000Z/ Northern Worcester MA-Northern Middlesex MA- Including the cities of Barre, Fitchburg, and Ayer 755 PM EDT Fri Apr 16 2021 ...WINTER STORM WARNING WILL EXPIRE AT 8 PM EDT THIS EVENING... Precipitation continues to wind down as low pressure lifts offshore. There could be up to an additional inch of accumulation before precipitation ends. Therefore, the Winter Storm Warning will be allowed to expire. $$ MAZ003-009-010-170100- /O.EXP.KBOX.WW.Y.0013.000000T0000Z-210417T0000Z/ Eastern Franklin MA-Western Hampden MA-Eastern Hampshire MA- Including the cities of Greenfield, Orange, Blandford, Amherst, and Northampton 755 PM EDT Fri Apr 16 2021 ...WINTER WEATHER ADVISORY WILL EXPIRE AT 8 PM EDT THIS EVENING... Precipitation continues to wind down as low pressure lifts offshore. There could be up to an additional half inch of accumulation before precipitation ends. Therefore, the Winter Weather Advisory will be allowed to expire. $$
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 Watch | BOX | Middlesex, Worcester | 12 hr |
| Apr 15, 3:37 AM EDT | Winter Storm Warning | BOX | Franklin, Hampshire, Middlesex, Worcester | 40 hr |
| Apr 15, 3:40 AM EDT | Gale Warning | BOX | 48 hr |
Nearby
Winter Weather Advisories in Massachusetts, 2021Every winter weather advisory 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.