Thursday June 9, 2011
Widespread Severe Weather Outbreak

Another widespread outbreak of severe thunderstorms hit eastern New York and western New England from roughly 1pm through 5pm Thursday June 9, 2011. This event consisted of initially a few isolated thunderstorm line segments, which formed in the Adirondacks, Mohawk valley, and western Catskills, between noon and 1pm. These t'storms then consolidated into a solid squall line as it passed over the Capital Region intensifying as it moved into the mid Hudson valley and Berkshire County. This system produced fairly widespread damaging wind gusts along with thousands of vivid violent cloud to ground lightning strikes along its leading edge especially over Columbia, Berkshire, Dutchess and Litchfield counties where it reached its peak intensity locally. Approximately 25,000 local National Grid customers lost power during the height of the event with power outages continuing through Friday June 10. Up to two inches of rain also fell in especially the mid Hudson valley and Berkshire County with the passage of the thunderstorms with generally minor street flooding reported in parts of Berkshire, Dutchess, and Litchfield counties. The squall line continued through New England where it unleashed further damaging wind as it accelerated towards the coast by the evening. The following series of Instant Doppler 6 radar images chronicles the development of the June 9 squall line.

Instant Doppler 6 Radar Images

2:08 pm Thursday June 9, 2011

Instant Doppler 6, 2:08 pm June 9, 2011

2:43 pm Thursday June 9, 2011

Instant Doppler 6, 2:43 pm June 9, 2011 

3:08 pm Thursday June 9, 2011

Instant Doppler 6, 3:08 pm June 9, 2011 

4:28 pm Thursday June 9, 2011

>Instant Doppler 6, 4:28 pm June 9, 2011 

Set-Up

A hot, humid, and potentially very unstable atmosphere existed over eastern New York, and western and southern New England. CAPE values (convective potential instability) grew to between 2000 and 3500 j/kg as the combination of high heat and humidity, (air temperatures in the upper 80s to lower 90s, and dewpoints in the upper 60s) coupled with some cooling aloft with the approach of a shallow upper level low pressure trough created a favorable thermodynamic environment for t'storm development. With temperatures slowly falling aloft, limited capping existed (warm air aloft), as had been the case prior to the severe weather event on June 8, so thunderstorm updrafts in this case were easily able to develop during the heating of the day. A cold front moved into the St. Lawrence valley and a low pressure trough (pre-frontal trough) developed over central and northern New York in advance of the front. It was along the pre-frontal trough, where low level convergence maximized, where thunderstorm development was focused. A fairly unidirectional moderately fast mid level flow existed across the region to cause multi-cell t'storm clusters to organize into a formidable squall line through the afternoon.

STORM REPORTS June 9, 2011

Town County Storm Report Time
Ephratah Fulton Estimated 1" diameter Hail 12:50pm
5 Miles No. of Speculator Hamilton Estimated 1" diameter Hail 12:53pm
West Winfield Herkimer 1.75" diameter Hail (golf ball sized) 12:58pm
West Winfield Herkimer Estimated 1" diameter Hail 1:00pm
1 Mile W. of Richfield Springs Otsego Measured 1" diameter Hail 1:13pm
Thurman Warren T'Storm Wind Damage, Trees blown down 1:22pm
Bolton Warren T'storm Wind Damage, Trees blown down 1:27pm
West Winfield Herkimer Estimated 2" diameter Hail 1:28pm
Cherry Valley Otsego Measured 1" diameter Hail 1:39pm
2 Miles NW of Fonda Montgomery Estimated 1" diameter Hail 2:05pm
Johnstown Fulton Estimated 1" diameter Hail 2:05pm
Perth Fulton Estimated 1" diameter Hail 2:15pm
4 Miles No. of Glens Falls Warren Estimated 1" diameter Hail 2:15pm
Amsterdam Montgomery Estimated 1" diameter Hail 2:20pm
Perth Fulton Estimated 1" diameter Hail 2:20pm
3 Miles NNW of Glens Falls Warren Estimated 2" diameter Hail 2:26pm
Gansevoort Saratoga Estimated 1.25" diameter Hail 2:40pm
Brunswick Rensselaer T'Storm Wind Damage, trees and wires blown down 2:45pm
Fort Edward Washington Estimated 1" diameter Hail 2:48pm
Landgrove, VT Bennington Trees and power lines blown down 2:48pm
Argyle Washington Estimated 1.75" diameter Hail 2:50pm
Gansevoort Saratoga Estimated 1" diameter Hail 2:51pm
Troy Rensselaer T'Storm Wind Damage, Trees and Wires blown down 3:15pm
5 Miles SSW of E. Greenbush Rensselaer T'Storm Wind Damage, Trees limbs blown down 3:15pm
Freehold Greene T'Storm Wind Damage, Trees and wires blown down 3:17pm
Fish Eddy Delaware T'Storm Wind Damage, Power Lines blown down 3:30pm
Chatham Columbia T'Storm Wind Damage, Trees and Wires blown down 3:33pm
Hancock Delaware T'Storm Wind Damage, Trees down across Route 97 five miles south of Hancock  
Stuyvesant Columbia T'Storm Wind Damage, Wires blown down 3:56pm
Lee, MA Berkshire Major T'Storm Wind Damage, many large trees blown down 4:00pm
New Lebanon Columbia T'Storm Wind Damage, trees and wires blown down 4:05pm
East Fishkill Dutchess Estimated 1.75" diameter Hail 407pm
Norfolk, CT Litchfield Estimated 1.75" diameter Hail 4:13pm
Beacon Dutchess Estimated 1" diameter Hail 4:15pm
Hopewell Junction Dutchess Estimated 1" diameter Hail, significant wind damage to trees 4:17pm
Hopewell Junction Dutchess Estimated 1.25" diameter Hail 4:24pm
Hopewell Junction Dutchess Estimated 1.75" diameter Hail 4:24pm
Beacon Dutchess Estimated 1.50" diameter Hail 4:28pm
Torrington, CT Litchfield Estimated 1.50" diameter Hail 4:30pm
Wingdale Dutchess Wind Damage, trees and wires down 4:32pm
Winsted, CT Litchfield Estimated 1.50" diameter Hail 4:35pm
North Otis, MA Berkshire T'Storm Wind Damage, trees blown down 4:35pm
New Milford, CT Litchfield T'Storm Wind Damage, tree blown down on a house 4:35pm
Wappingers Falls Dutchess Estimated 1" diameter Hail 4:40pm
Hopewell Junction Dutchess Estimated 1" diameter Hail 4:41pm
Beekman Dutchess Estimated 1.75" diameter Hail 4:42pm
Wappingers Falls Dutchess Estimated 1.75" diameter Hail 4:43pm
Litchfield, CT Litchfield T'Storm Wind Damage, Trees down across Route 202 4:45pm
Dover Plains Dutchess Estimated 1" diameter Hail 4:49pm
LaGrangeville Dutchess T'storm Wind Damage, numerous trees blown down 4:53pm
Dover Plains Dutchess T'Storm Wind Damage, large trees blown down 4:53pm
LaGrangeville Dutchess Estimated 1.75" diameter Hail 4:53pm
Wappingers Falls Dutchess Wind Damage, Trees blown down 4:55pm
Beacon Dutchess Estimated 1" diameter Hail 4:57pm
Hopewell Junction Dutchess Estimated 1" diameter Hail 4:58pm
Woodbury, CT Litchfield Heavy Rain, 1.97" and wind damage 5:00pm
Wappingers Falls Dutchess Estimated 1.50" diameter Hail 5:01pm
Fishkill Dutchess Estimated 1" diameter Hail 5:01pm
Canaan, CT Litchfield T'Storm Wind Damage, trees blown down 5:07pm
Castle Point Dutchess Estimated 1.75" diameter Hail 5:10pm
Beacon Dutchess Estimated 1.50" diameter Hail 5:10pm
New Milford, CT Litchfield Major Wind Damage, dozens of trees reported down across Pumpkin Hill road 5:16pm
Stockbridge, MA Berkshire T'Storm Wind Damage, Many trees blown down 5:18pm
Stockbridge, MA Berkshire Minor Street Flooding due to torrential rain 5:18pm

Storm Pictures


Photographer: CBS6 viewer Debbie Southard...Both pictures are shots of severe thunderstorm straight line wind damage in Lee, MA Berkshire County on June 9, 2011
Wind Damage in Lee, MA June 9, 2011
Wind Damage in Lee, MA June 9, 2011
Photographer: WeatherNet 6 spotter Steve Meicht...The picture on the left is a thunderstorm shelf cloud north of Catskill on approach. The picture on the left is one of the many cloud to ground lightning strikes
Shelf cloud passing north of Catskill, NY June 9, 2011
Cloud to ground Lightning strike over Catskill, NY June 9, 2011
Left Photograph: Photographer Russell Hande, dramatic lightning strike over Hudson, NY Columbia County, 3:54pm June 9, 2011. Right Photograph: Photographer WeatherNet 6 spotter David Zboinski: Straight line severe thunderstorm wind damage in Hopewell Junction, Dutchess County June 9, 2011
A video freeze frame of a dramatic cloud to ground lightning strike, Hudson, NY 3:54pm June 9, 2011
Wind Damage in Hopewell Junction, Dutchess County June 9, 2011
Photographer: WeatherNet 6 spotter Paul Wyzomirski, large hail, some up to 1.5" in diameter, around 2pm in Fonda, Montgomery County June 9, 2011
Hail in Fonda, NY Montgomery County June 9, 2011

WeatherNet 6 Rainfall Reports for June 9, 2011
(Note: Rainfall in most cases fell in an hour or less)

Town County Rainfall Report Town County Rainfall Report
Savoy, MA Berkshire 0.60" Lanesborough, MA Berkshire 1.50"
Pittsfield, MA Berkshire 1.10" Alford, MA Berkshire 0.90"
           
Medusa Albany 1.49" Glenmont Albany 0.20"
           
Ancramdale Columbia 0.87" Ghent Columbia 1.56"
Livingston Columbia 0.28" Chatham Center Columbia 1.54"
Chatham Columbia 1.90" North Chatham Columbia 0.27"
           
Hopewell Junction Dutchess 0.73"      
           
Johnstown Fulton 0.40"      
           
Catskill Greene 0.27" Greenville Greene 0.16"
Lexington Greene 0.40"      
           
Wells Hamilton
0.33"
Indian Lake Hamilton 0.05"
Blue Mountain Lake Hamilton Trace      
           
Fonda Montgomery 0.56" Amsterdam Montgomery 0.38"
Hessville Montgomery 0.16"      
           
Cherry Valley Otsego 0.40" East Worcester Otsego 0.11"
Worcester Otsego 0.52"      
           
Center Brunswick Rensselaer 0.30" Berlin Rensselaer 0.90"
Lansingburgh Rensselaer 0.20"      
           
Charlton Saratoga 0.25" Wilton Saratoga 0.15"
Corinth Saratoga 0.08" Milton Saratoga Trace
           
Jefferson Schoharie 1.00" Summit Schoharie 0.13"
Milddleburgh Schoharie 0.67" Richmondville Schoharie 0.04"
           
Whiteport Ulster 0.08" Esopus Ulster 0.16"
Saugerties Ulster Trace      
           
Warrensburg Warren 0.30" Lake Luzerne Warren 0.06"
Brant Lake Warren 0.63" Queensbury Warren 0.44"
           
Salem Washington 1.00" Ft. Edward Washington 0.51"
Granville Washington 1.00" Cossayuna Washington 1.05"
           
Landgrove, VT Bennington 1.37" West Arlington, VT Bennington 0.48"
Woodford, VT Bennington 0.35" West Rutland, VT Rutland 1.50"
Danby, VT Rutland 0.46"