 Across Upstate New York, Damaging Thunderstorms resulted from an unprecedented temperature gradient and unusually strong Jet Stream winds over the area.Jet stream winds of 160 mph, and winds at the 1,000 foot level of as high as 70 mph crossed the area during the evening as an area of low pressure developed over the region and dragged a warm front northward.The Storm Prediction Center placed New York and Pennsylvania under a Moderate Risk for Severe Thunderstorms.