Quick Hitting Rain to Snow Event
Mid Hudson Valley to Berkshire County T'Storms 2-4pm
EF1 Amenia Tornado
EF0 Kent, CT Tornado
Wednesday April 21, 2021


A Winter and Spring Clash

Spring: 3pm Albany Doppler Radar Image: Strong thunderstorms with frequent lightning and small hail in Berkshire County. A rotating severe thunderstorm going through Amenia in Dutchess County and Kent, CT in Litchfield County had just produced brief tornadoes in those locations.

Albany Doppler radar showing t'storms at 3pm April 21, 2021 

Winter: 3pm Albany Doppler Radar Image: Widespread snow and sleet in a cold air mass west of the storm track from the Hudson valley and points west was simultaneously in progress as the strong thunderstorms only a few miles to the east.

Albany Doppler radar showing widespread sleet and snow in the cold air in the Hudson valley and points west, 3pm April 21, 2021 

A vigorously intensifying storm raced northeast from Pennsylvania to the mid Hudson valley by early afternoon on the 21st and then to western Maine by early evening. A tight thermal gradient from west to east across the storm caused a classic winter-spring clash over the local area resulting in both thunderstorms along and east of the storm track and rain changing to sleet, graupel and snow along and west of the storm track, both illustrated in the two above radar images at 3pm. The entire event spanned only a few hours from roughly noon to 6pm with the core of the strongest storms and most robust snowfall occurring within a tighter time frame from roughly 2pm to 5pm.

4pm Northeast Temperature Observations, April 21, 2021

Thunderstorms occurred locally in eastern Ulster, eastern Greene, Columbia, Berkshire, Dutchess and Litchfield counties with a severe thunderstorm with strong rotation indicated on radar causing hail, damaging wind straight line wind and two brief tornado touchdowns in east central Dutchess County around Amenia and in a swath up through central Litchfield County, CT. (See below for the tornado reports.) That storm went on into the Springfield, MA area producing additional hail and wind damage with the cell tied closely to the actual synoptic scale low pressure system as it raced NE at over 50 mph. Temperatures briefly warmed into the 60s along and east of the storm track creating a bubble of unstable air which allowed strong and highly directionally sheared winds aloft to mix down to the ground in damaging gusts. Temperatures at the same time ranged through the 30s west and north of the storm track which supported a change in precipitation type to snow in the cold air mass.

Snow accumulations were limited to an inch or two at elevations of 1500' and higher with a lot of coatings on grassy surfaces in valley areas from the mid afternoon through the early evening with the precipitation shield only remaining in tact for a couple of hours, falling apart quickly as the storm raced away from the region early in the evening.

Windy and cold conditions followed the storm through the night with areas of light upslope snow east of the Hudson valley into Washington, Rensselaer, Bennington and northern Berkshire counties and some lake effect flurries and snow showers into the Mohawk valley and Catskills persisting through the night as well as through Thursday the 22nd where there were additional mainly higher elevation accumulations of 1"-2" in the western Mohawk valley, Catskills and across the higher terrain in Vermont.


WeatherNet Snowfall Reports Wednesday April 21, 2021

Town County Snowfall Report Town County Snowfall Report
Savoy, MA Berkshire 0.4"      
           
Knox Albany 0.7" Albany (ASOS) Albany Trace
           
Franklin Delaware 3.0" Denver Delaware Trace
           
Halcott Greene 0.3"      
           
Wells Hamilton 0.8" Piseco Hamilton 1.0"
Indian Lake Hamilton 4.0"      
           
Amsterdam Montgomery 0.5" Glen Montgomery 2.0"
           
Oneonta Otsego 1.0" East Worcester Otsego 1.6"
Worcester Otsego 1.3"      
           
Center Brunswick Rensselaer 1.5" Speigletown Rensselaer 0.3"
           
Lake Desolation Saratoga 1.5" Clifton Park Saratoga 0.2"
           
Richmondville Schoharie 2.0" Charlotteville Schoharie 2.0"
Warnerville Schoharie 1.0" Huntersland Schoharie 0.3"
           
Warrensburg Warren Trace      
           
Granville Washington 1.5" Cossayuna Washington Trace
Hartford Washington 2.0" Whitehall Washington 2.0"
           
Landgrove, VT Bennington Trace Woodford, VT Bennington Trace
Danby, VT Rutland 0.3"      


Albany NWS Storm Damage Team Tornado Reports


Albany NWS tornado report - Amenia, Dutchess County, April 21, 2021

Storm summary from the Albany National Weather Service: "A tornado briefly touched down just south of Amenia and moved north, northeast into the village. The tornado started near the intersection of Powder House Road and Ohandley Drive and caused sporadic damage along its path length. One house along Ohandley drive had partial roof damage and a two by four and a small branch driven into the side of the home. Nine out of ten homes on Ohandley Drive sustained damage. the tornado ended near the intersection of Mechanic Street and East main Street where it ripped the roof off a restaurant." This is the earliest tornado on record in Dutchess County in the year to date. (records back to 1950)

Albany NWS track plot of the Amenia, Dutchess County tornado, April 21, 2021 

Albany NWS tornado report - Kent, CT, Litchfield County, April 21, 2021

Storm summary from the Albany National Weather Service: "A tornado briefly touched down just north of Bulls Bridge, CT and moved east, northeast into South Kent. the tornado damage was sporadic along the path which began along Route 7 just north of Bulls Bridge and consisted mostly of downed tree limbs. A few hardwood trees were snapped and uprooted and one home owner lost part of a solid wooden fence along Spooner Hill Road. A car tent canopy was blown away by the strong winds. No damage to buildings." This is the earliest tornado on record for the state of Connecticut to date. (records back to 1950)

Albany NWS track plot of the Kent, Litchfield County tornado, April 21, 2021