Moderate to heavy snow and wind gusts of up to 35 mph will combine to reduce visibility to a half mile at times, making travel dangerous, according to meteorologists at the Upton office of the National Weather Service (NWS).“Only travel in an emergency,” NWS warned in a winter weather warning that is in effect for Suffolk County from 3 a.m. to 3 p.m. Friday. “If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency.”Nassau County is under a winter weather advisory. Less snow is forecast on western LI.The storm is expected to blanket much of the tri-state area and Northeast in snow, although in some areas the storm will start as rain before changing into snow.Temperatures are expected to be in the 30s when the storm hits. Once it passes, the rest of the weekend is forecast as sunny with temperatures in the 40s. Sign up for our COVID-19 newsletter to stay up-to-date on the latest coronavirus news throughout New York A winter storm is forecast to dump between five inches and a foot of snow on parts of Long Island overnight Friday, snarling the morning rush hour commute.