Event Summary

Clusters of strong thunderstorms developed in a moist unstable airmass ahead of a slow moving cold front. As thunderstorms moved east southeast at speeds averaging 20 MPH, they produced high winds, large hail and torrential rain. Trees were knocked down and a building collapsed at the intersection of Jersey and Front Streets in Port Jervis of Orange County. In addition to the 1 inch diameter hail report from Stony Point, 3/4 inch diameter hail was also reported in Pomona in Rockland County. Winds that gusted to 75 MPH downed trees in Ossining in Westchester County. Serious flooding was reported along the Saw Mill River Parkway in Westchester County and across Southern New York County. A huge maple tree was downed about 1/2 mile north of the Sayville train station in Suffolk County.