A very energetic mid-atmospheric disturbance moved across the Great Lakes during the afternoon and evening of June 10th. This developed a surface low along a cold front, which moved across northern New York during the afternoon. These features moved across a very warm, humid and unstable airmass draped across New York that resulted in two rounds of widespread severe thunderstorms.
The first round moved across northern New York during the early afternoon hours and the second round occurred during the early evening.
In northern New York (Clinton, Essex, Franklin and St. Lawrence counties)...hundreds to thousands of trees were damaged, downed or uprooted which caused downed power lines, fires and structural damage to buildings and vehicles. Tens of thousands of customers lost power due to the storms, with some outages that lasted several days. Some communities affected included Potsdam, Parishville and Colton (St. Lawrence county), Moira, Malone and Vermontville (Franklin county), Peru, Plattsburgh and Ellenburg (Clinton county) as well as Wilmington, Westport and Jay (Essex county).
Several fallen trees resulted in injuries and one death resulted from a motorcyclist driving into a downed tree across the road in Wilmington (Essex county).

Thunderstorm Wind in ESSEX, NEW YORK
From 10-JUN-08 18:08:00 to 10-JUN-08 18:08:00 (EST-5)
Location: WILMINGTON
Magnitude: 55.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Trees downed by thunderstorms winds in Wilmington, including Route 86 and Springfield road. Motorcyclist hit fallen tree on road and died from his injuries.

Thunderstorm Wind in ESSEX, NEW YORK
From 10-JUN-08 18:10:00 to 10-JUN-08 18:10:00 (EST-5)
Location: UPPER JAY
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Numerous trees down across and along Route 9N between Jay and Upper Jay.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 10-JUN-08 11:35:00 to 10-JUN-08 11:35:00 (EST-5)
Location: RUSSELL
Magnitude: 60.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Numerous and widespread reports of large trees downed on power lines and houses.

Hail in FRANKLIN, NEW YORK
From 10-JUN-08 17:40:00 to 10-JUN-08 17:40:00 (EST-5)
Location: FAUST
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Estimated golf ball size hail reported by State Police.

Thunderstorm Wind in ESSEX, NEW YORK
From 10-JUN-08 13:36:00 to 10-JUN-08 13:36:00 (EST-5)
Location: WESTPORT
Magnitude: 60.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Department of Highways

Trees downed throughout Westport, including Main Street near the County Fairgrounds. Trees and power lines down along Route 9N/22.

Thunderstorm Wind in CLINTON, NEW YORK
From 10-JUN-08 12:40:00 to 10-JUN-08 12:40:00 (EST-5)
Location: ELLENBURG
Magnitude: 55.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and power lines down across Route 190 and forced road closure near Ellenburg.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 10-JUN-08 11:55:00 to 10-JUN-08 11:55:00 (EST-5)
Location: CRANBERRY LAKE
Magnitude: 55.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

More than a dozen trees reported downed by thunderstorm winds.

Thunderstorm Wind in CLINTON, NEW YORK
From 10-JUN-08 18:25:00 to 10-JUN-08 18:25:00 (EST-5)
Location: PERU
Magnitude: 65.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Newspaper

Numerous trees down across Peru, including fallen onto a house that injured two people. Barn roof torn off by high winds as well.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 10-JUN-08 11:50:00 to 10-JUN-08 11:50:00 (EST-5)
Location: COLTON
Magnitude: 60.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous and widespread reports of trees downed by thunderstorm winds on power lines and vehicles.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 10-JUN-08 11:59:00 to 10-JUN-08 11:59:00 (EST-5)
Location: POTSDAM
Magnitude: 50.00 MG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: AWOS

Measured 58 mph wind gust from AWOS. Also numerous reports of fallen trees and power lines.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 10-JUN-08 17:55:00 to 10-JUN-08 17:55:00 (EST-5)
Location: SARANAC LAKE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Trees and power lines downed by thunderstorms winds in Saranac Village.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 10-JUN-08 12:19:00 to 10-JUN-08 12:19:00 (EST-5)
Location: MALONE
Magnitude: 51.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Estimated wind gust of 59 mph from Cooperative observer, as well as trees reported down.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 10-JUN-08 17:29:00 to 10-JUN-08 17:29:00 (EST-5)
Location: FAUST
Magnitude: 70.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Estimated wind gusts to 80 mph with numerous trees and power lines downed.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 10-JUN-08 12:05:00 to 10-JUN-08 12:05:00 (EST-5)
Location: PARISVILLE CENTER
Magnitude: 65.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Newspaper

Thunderstorms winds downed numerous trees and power lines across Potsdam/Colton/Parishville/Hopkinton vicinity. Roads throughout Parishville blocked by downed trees and power lines, including a tree that fell and severely damaged a home.

Thunderstorm Wind in CLINTON, NEW YORK
From 10-JUN-08 12:49:00 to 10-JUN-08 12:49:00 (EST-5)
Location: BEEKMANTOWN
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Numerous trees and power lines downed by thunderstorm winds in Beekmantown, north Plattsburgh and Chazy area.

Thunderstorm Wind in CLINTON, NEW YORK
From 10-JUN-08 12:50:00 to 10-JUN-08 12:50:00 (EST-5)
Location: FOREST
Magnitude: 50.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Several trees snapped or downed by thunderstorm winds, along with power lines that have blocked several roads.

Thunderstorm Wind in CLINTON, NEW YORK
From 10-JUN-08 13:05:00 to 10-JUN-08 13:05:00 (EST-5)
Location: PLATTSBURGH
Magnitude: 55.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees down across Plattsburgh, that have fallen onto power lines and some structures.

Thunderstorm Wind in ST. LAWRENCE, NEW YORK
From 10-JUN-08 17:00:00 to 10-JUN-08 17:00:00 (EST-5)
Location: CRANBERRY LAKE
Magnitude: 70.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Widespread trees and powerlines down from Wanakena to Tupper Lake along Route 3. Some structures, including camps were heavily damaged.

Thunderstorm Wind in CLINTON, NEW YORK
From 10-JUN-08 12:52:00 to 10-JUN-08 12:52:00 (EST-5)
Location: ALTONA
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Trees reported down across Altona.

Thunderstorm Wind in ESSEX, NEW YORK
From 10-JUN-08 13:00:00 to 10-JUN-08 13:00:00 (EST-5)
Location: KEESEVILLE ARPT
Magnitude: 50.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Numerous one foot diameter trees down.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 10-JUN-08 12:15:00 to 10-JUN-08 12:15:00 (EST-5)
Location: SARANAC LAKE
Magnitude: 55.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees down across Saranac Lake vicinity along Route 3 between
Saranac Village and Tupper Lake.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 10-JUN-08 12:10:00 to 10-JUN-08 12:10:00 (EST-5)
Location: MOIRA
Magnitude: 60.00 EG
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Public

Numerous trees downed by thunderstorm winds on power lines, vehicles and houses throughout Moria, including Route 5.

Thunderstorm Wind in FRANKLIN, NEW YORK
From 10-JUN-08 12:30:00 to 10-JUN-08 12:30:00 (EST-5)
Location: WHIPPLEVILLE
Magnitude: 55.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: COOP Observer

Numerous and widespread trees downed between Malone and Westfield with Routes 5 and 8 closed due to blocked roads and power lines.

Thunderstorm Wind in CLINTON, NEW YORK
From 10-JUN-08 18:25:00 to 10-JUN-08 18:25:00 (EST-5)
Location: AUSABLE CHASM
Magnitude: 55.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Numerous trees and power lines down across Port Douglas Road and throughout Keeseville.