A significant severe weather event occurred across east central New York on Thursday June 9th. A very warm and humid air mass was in place across the region on the morning of June 9th. A cold front was positioned well to the north and west of the region, toward the Upper Great Lakes. However, a well-defined pre-frontal trough marched across Upstate New York during the morning and afternoon hours. This pre-frontal trough showed up well in observational data, with an abrupt wind shift to the northwest and a sharp drop in dew points. The pre-frontal trough triggered convection, first as a series of discrete storms developing into a broken line, which eventually evolved into an organized line of severe storms known as a severe quasi-linear-convective-system, QLCS. Initially, when the storms were discrete, hail was the main threat. Once the QLCS developed, damaging winds were the main threat. The severe storms resulted in numerous power outages with the large hail denting vehicles.

Hail in FULTON, NEW YORK
From 09-JUN-11 11:50:00 to 09-JUN-11 11:52:00 (EST-5)
Location: EPHRATAH
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported during a thunderstorm in Ephratah.

Hail in HERKIMER, NEW YORK
From 09-JUN-11 11:55:00 to 09-JUN-11 12:05:00 (EST-5)
Location: WEST WINFIELD
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail up to 2 inches in diameter was reported during a thunderstorm in West Winfield.

Thunderstorm Wind in DUTCHESS, NEW YORK
From 09-JUN-11 16:00:00 to 09-JUN-11 16:00:00 (EST-5)
Location: MATTEAWAN
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

A tree was reported down in Beacon due to strong thunderstorm winds.

Thunderstorm Wind in WARREN, NEW YORK
From 09-JUN-11 12:22:00 to 09-JUN-11 12:22:00 (EST-5)
Location: THURMAN
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were reported down in Thurman due to strong thunderstorm winds.

Thunderstorm Wind in WARREN, NEW YORK
From 09-JUN-11 12:27:00 to 09-JUN-11 12:27:00 (EST-5)
Location: BOLTON
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Several trees were reported down in Bolton due to strong thunderstorm winds.

Hail in SARATOGA, NEW YORK
From 09-JUN-11 13:40:00 to 09-JUN-11 13:45:00 (EST-5)
Location: GANSEVOORT
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Trained Spotter

Half dollar size hail was reported during a thunderstorm in Gansevoort.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:40:00 to 09-JUN-11 15:43:00 (EST-5)
Location: HOPEWELL JCT
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported during a thunderstorm in Hopewell Junction.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:42:00 to 09-JUN-11 15:45:00 (EST-5)
Location: BEEKMAN
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was reported during a thunderstorm in Beekman.

Hail in FULTON, NEW YORK
From 09-JUN-11 13:00:00 to 09-JUN-11 13:02:00 (EST-5)
Location: JOHNSTOWN
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported during a thunderstorm in Johnstown.

Hail in WASHINGTON, NEW YORK
From 09-JUN-11 13:48:00 to 09-JUN-11 13:50:00 (EST-5)
Location: FT EDWARD
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported during a thunderstorm in Fort Edward.

Hail in WASHINGTON, NEW YORK
From 09-JUN-11 13:50:00 to 09-JUN-11 13:52:00 (EST-5)
Location: ARGYLE
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was reported during a thunderstorm in Argyle.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 09-JUN-11 13:45:00 to 09-JUN-11 13:45:00 (EST-5)
Location: BRUNSWICK
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and wires were reported down in Brunswick due to strong thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 09-JUN-11 13:45:00 to 09-JUN-11 13:45:00 (EST-5)
Location: CASTLETON ON HDSN AR
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

Tree limbs were reported down in Castleon-on-Hudson due to strong thunderstorm winds.

Thunderstorm Wind in RENSSELAER, NEW YORK
From 09-JUN-11 13:45:00 to 09-JUN-11 13:45:00 (EST-5)
Location: SYCAWAY
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and wires were reported down in Troy due to strong thunderstorm winds.

Thunderstorm Wind in GREENE, NEW YORK
From 09-JUN-11 14:15:00 to 09-JUN-11 14:15:00 (EST-5)
Location: FREEHOLD
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and wires were reported down in Freehold due to strong thunderstorm winds.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:56:00 to 09-JUN-11 15:58:00 (EST-5)
Location: HOPEWELL JCT
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported during a thunderstorm in Hopewell Junction.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:56:00 to 09-JUN-11 15:58:00 (EST-5)
Location: DIDDELL
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported during a thunderstorm in Myers Corner.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 16:00:00 to 09-JUN-11 16:03:00 (EST-5)
Location: BRINCKERHOFF
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported during a thunderstorm in Fishkill.

Hail in FULTON, NEW YORK
From 09-JUN-11 13:15:00 to 09-JUN-11 13:20:00 (EST-5)
Location: HILL CORNERS
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Quarter size hail was reported during a thunderstorm in Perth.

Hail in WARREN, NEW YORK
From 09-JUN-11 13:15:00 to 09-JUN-11 13:25:00 (EST-5)
Location: (GFL)GLENS FALLS ARP
Magnitude: 2.00 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail up to 2 inches in diameter was reported during a thunderstorm in the Glens Falls and Queensbury area.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 16:05:00 to 09-JUN-11 16:08:00 (EST-5)
Location: CHELSEA
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was reported during a thunderstorm in Castle Point.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:26:00 to 09-JUN-11 15:28:00 (EST-5)
Location: WAPPINGERS FALLS
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported during a thunderstorm in Wappingers Falls.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:40:00 to 09-JUN-11 15:45:00 (EST-5)
Location: HAVILAND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported during a thunderstorm in Dover Plains.

Thunderstorm Wind in DUTCHESS, NEW YORK
From 09-JUN-11 15:53:00 to 09-JUN-11 15:53:00 (EST-5)
Location: BILLINGS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

Numerous tree limbs were reported down in Lagrangeville due to strong thunderstorm winds.

Thunderstorm Wind in DUTCHESS, NEW YORK
From 09-JUN-11 15:55:00 to 09-JUN-11 15:55:00 (EST-5)
Location: WAPPINGERS FALLS
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

Trees were reported down in Wappingers Falls due to strong thunderstorm winds.

Thunderstorm Wind in DUTCHESS, NEW YORK
From 09-JUN-11 15:53:00 to 09-JUN-11 15:53:00 (EST-5)
Location: HAVILAND
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

Trees and limbs were reported down in Dover Plains due to strong thunderstorm winds.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:50:00 to 09-JUN-11 15:53:00 (EST-5)
Location: BILLINGS
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was reported during a thunderstorm in Lagrangeville.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:55:00 to 09-JUN-11 15:57:00 (EST-5)
Location: MATTEAWAN
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported during a thunderstorm in Beacon.

Hail in MONTGOMERY, NEW YORK
From 09-JUN-11 13:20:00 to 09-JUN-11 13:22:00 (EST-5)
Location: AMSTERDAM
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Public

Quarter size hail was reported during a thunderstorm in Amsterdam.

Hail in HAMILTON, NEW YORK
From 09-JUN-11 11:53:00 to 09-JUN-11 11:55:00 (EST-5)
Location: SABAEL
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Park/Forest Service

Quarter size hail was reported during a thunderstorm approximately 5 miles north of Speculator.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 16:00:00 to 09-JUN-11 16:03:00 (EST-5)
Location: WAPPINGERS FALLS
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Public

Ping-pong ball size hail was reported during a thunderstorm in Wappingers Falls.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 16:05:00 to 09-JUN-11 16:08:00 (EST-5)
Location: MATTEAWAN
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Public

Ping-pong size hail was reported during a thunderstorm in Beacon.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 09-JUN-11 14:33:00 to 09-JUN-11 14:33:00 (EST-5)
Location: CHATHAM
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

Trees and wires were reported down in Chatham due to strong thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 09-JUN-11 14:40:00 to 09-JUN-11 14:40:00 (EST-5)
Location: STUYVESANT
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

Wires were reported down in Stuyvesant due to strong thunderstorm winds.

Thunderstorm Wind in COLUMBIA, NEW YORK
From 09-JUN-11 14:40:00 to 09-JUN-11 14:40:00 (EST-5)
Location: NEW LEBANON
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

Trees and wires were reported down in New Lebanon due to strong thunderstorm winds.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:07:00 to 09-JUN-11 15:10:00 (EST-5)
Location: EAST FISHKILL
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was reported during a thunderstorm in East Fishkill.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:15:00 to 09-JUN-11 15:25:00 (EST-5)
Location: CASTLE PT
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Multiple reports of hail greater than an inch in diameter were reported during a thunderstorm in Beacon. The largest hail stones observed were estimated to be the size of golf balls.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:15:00 to 09-JUN-11 15:25:00 (EST-5)
Location: HOPEWELL JCT
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Multiple reports of hail greater than an inch in diameter were reported during a thunderstorm in Hopewell Junction. The largest hail stones observed were estimated to be the size of golf balls.

Thunderstorm Wind in DUTCHESS, NEW YORK
From 09-JUN-11 15:32:00 to 09-JUN-11 15:32:00 (EST-5)
Location: WEBATUCK
Magnitude: 50.00 EG
Crop damage: 0.00K
Reported by: Public

Trees and wires were reported down in Wingdale due to strong thunderstorm winds.

Hail in DUTCHESS, NEW YORK
From 09-JUN-11 15:40:00 to 09-JUN-11 15:45:00 (EST-5)
Location: WAPPINGERS FALLS
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Public

Golf ball size hail was reported during a thunderstorm in Wappinger Falls.

Hail in MONTGOMERY, NEW YORK
From 09-JUN-11 12:55:00 to 09-JUN-11 12:57:00 (EST-5)
Location: FONDA
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Broadcast Media

Ping-pong ball size hail was reported during a thunderstorm by a Weathernet6 observer approximately 2 north-northwest of Fonda.