Alert archive / Massachusetts / Winter Storm Watches in 2021
Winter Storm Watch 1, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this winter storm watch at Jan 28, 2021, 3:53 PM EST for Barnstable County, Nantucket County, Massachusetts. It took effect at Jan 29, 2021, 7:00 AM EST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Jan 28, 2021, 3:53 PM EST (20:53 UTC)
- In effect from
- Jan 29, 2021, 7:00 AM EST
- Expired
- Jan 29, 2021, 3:26 AM EST
- In force
- Issued by
- NWS Boston/Norton, MA
Counties Barnstable County, MA, Nantucket County, MA
The radar
The Boston radar (KBOX), 98 km from the middle of the area, began a volume at 20:55 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, 8.9 hours before the alert went out and 26 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
- 1 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 558 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- -27 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
907 WWUS41 KBOX 282053 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 353 PM EST Thu Jan 28 2021 CTZ002>004-MAZ002>004-008>012-026-290900- /O.CON.KBOX.WC.Y.0001.210129T0500Z-210129T1700Z/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA- Eastern Franklin MA-Northern Worcester MA-Western Hampshire MA- Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Southern Worcester MA-Northern Middlesex MA- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Charlemont, Greenfield, Orange, Barre, Fitchburg, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, and Ayer 353 PM EST Thu Jan 28 2021 ...WIND CHILL ADVISORY REMAINS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON EST FRIDAY... * WHAT...Very cold wind chills expected. Wind chills as low as 20 below zero. * WHERE...Portions of northern Connecticut and central, eastern and western Massachusetts. * WHEN...From midnight tonight to noon EST Friday. * IMPACTS...The cold wind chills could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. && $$ MAZ022-024-290900- /O.NEW.KBOX.WS.A.0001.210129T1200Z-210130T0100Z/ Barnstable MA-Nantucket MA- Including the cities of Chatham, Falmouth, Provincetown, and Nantucket 353 PM EST Thu Jan 28 2021 ...WINTER STORM WATCH IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING... * WHAT...Heavy snow possible. Total snow accumulations of up to 6 inches possible. Winds could gust as high as 45 mph. * WHERE...Barnstable MA and Nantucket MA Counties. The greatest risk is east of Hyannis from Provincetown to Chatham and Nantucket. * WHEN...From Friday morning through Friday evening. * IMPACTS...Near blizzard conditions are possible in the areas mentioned. The hazardous conditions could result in difficult travel due to low visibilities, strong winds and slick roads. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...There is uncertainty to where the heaviest snow will set up. If the band stays further offshore then the snowfall accumulations will be less. Even if the snow amounts are less still expect travel impacts due to reduced visibility from snow in combination with the strong winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
1 follow-up statement
375 WWUS41 KBOX 290826 WSWBOX URGENT - WINTER WEATHER MESSAGE National Weather Service Boston/Norton MA 326 AM EST Fri Jan 29 2021 MAZ022-291630- /O.UPG.KBOX.WS.A.0001.210129T1200Z-210130T0100Z/ /O.NEW.KBOX.WW.Y.0004.210129T1200Z-210130T0100Z/ Barnstable MA- Including the cities of Chatham, Falmouth, and Provincetown 326 AM EST Fri Jan 29 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 8 PM EST THIS EVENING... * WHAT...Heavy snow showers expected. Total snow accumulations of 2 to 6 inches. Winds gusting as high as 45 mph. * WHERE...Barnstable MA County, especially over the Outer Cape. Expect lesser amounts towards the Cape Cod Canal. * WHEN...From 7 AM this morning to 8 PM EST this evening. * IMPACTS...Near blizzard conditions are possible especially across the Outer Cape. The hazardous conditions could result in difficult travel due to low visibilities, strong winds and slick roads. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...There remains some uncertainty as to where the heaviest snow will set up. If the band stays further offshore then the snowfall accumulations will be less. Even if the snow amounts are less still expect travel impacts due to reduced visibility from snow in combination with the strong winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. Remember to stay weather aware as road conditions can deteriorate rapidly. && $$ MAZ024-291630- /O.UPG.KBOX.WS.A.0001.210129T1200Z-210130T0100Z/ /O.NEW.KBOX.WW.Y.0004.210129T1200Z-210130T0100Z/ Nantucket MA- Including the city of Nantucket 326 AM EST Fri Jan 29 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 8 PM EST THIS EVENING... * WHAT...Heavy snow showers expected. Total snow accumulations of 1 to 4 inches. Winds gusting as high as 50 mph. * WHERE...Nantucket MA County. * WHEN...From 7 AM this morning to 8 PM EST this evening. * IMPACTS...Near blizzard conditions are possible. The hazardous conditions could result in difficult travel due to low visibilities, strong winds and slick roads. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...There remains some uncertainty as to where the heaviest snow will set up. If the band stays further offshore then the snowfall accumulations will be less. Even if the snow amounts are less still expect travel impacts due to reduced visibility from snow in combination with the strong winds. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. Remember to stay weather aware as road conditions can deteriorate rapidly. && $$ CTZ002>004-MAZ002>004-008>012-026-291630- /O.CON.KBOX.WC.Y.0001.000000T0000Z-210129T1700Z/ Hartford CT-Tolland CT-Windham CT-Western Franklin MA- Eastern Franklin MA-Northern Worcester MA-Western Hampshire MA- Western Hampden MA-Eastern Hampshire MA-Eastern Hampden MA- Southern Worcester MA-Northern Middlesex MA- Including the cities of Hartford, Windsor Locks, Union, Vernon, Putnam, Willimantic, Charlemont, Greenfield, Orange, Barre, Fitchburg, Chesterfield, Blandford, Amherst, Northampton, Springfield, Milford, Worcester, and Ayer 326 AM EST Fri Jan 29 2021 ...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL NOON EST TODAY... * WHAT...Very cold wind chills expected. Wind chills as low as 20 below zero. * WHERE...Portions of northern Connecticut and central, eastern and western Massachusetts. * WHEN...From midnight tonight to noon EST Friday. * IMPACTS...The cold wind chills could cause frostbite on exposed skin in as little as 30 minutes. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. && $$
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 28, 3:31 AM EST | Gale Warning | BOX | 42 hr | |
| Jan 28, 3:32 AM EST | Wind Chill Advisory | BOX | Franklin, Hampden, Hampshire, Middlesex, Worcester | 32 hr |
| Jan 28, 3:53 PM EST | Heavy Freezing Spray Warning | BOX | 30 hr | |
| Jan 28, 3:53 PM EST | Heavy Freezing Spray Advisory | 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.