If outdoors, consider seeking shelter inside a building.

At 909 AM EDT, Doppler radar was tracking strong thunderstorms along a line extending from 9 miles northwest of Mattituck to Manorville to 6 miles south of Mastic Beach. Movement was east at 50 mph. HAZARD...Winds in excess of 30 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to outdoor objects is possible. Locations impacted include... Riverhead, Southold, Manorville, Center Moriches, Mattituck, Southampton, Westhampton, Sag Harbor, Bridgehampton, Plum Island, Gardiners Island, Mastic Beach, Calverton, Noyack, and Shelter Island.