With roads and sidewalks wet from rain or slush overnight and today, a flash freeze is a major concern as temperatures plummet below freezing.
Snow falling on top of the icy roads will make travel even more treacherous, while winds whipping the snow around will make it downright dangerous. The combination of the icy roads, snow and low visibility could even force officials to make closures some areas.
Early Sunday morning, temperatures were already dropping into the 20s across western Ohio and approaching the freezing mark in some higher elevations of the Northeast and New England.
Travelers across the Midwest and Northeast will face icy, snow-covered roads, like the one pictured in this Photos.com photo. Post any pictures you have of the storm on our AccuWeather.com Facebook page!
Temperatures have continued to drop or stay steady throughout the day across the Midwest and about as far east as Pittsburgh, with any lingering rain changing to snow.
Farther east, temperatures will not hit the freezing mark in most places until tonight.
Subfreezing temperatures will extend all the way from the interior West to the Gulf Coast and much of the Eastern Seaboard tonight. Temperatures will even dip below freezing in areas from South Texas to the central Gulf Coast and the northern half of Florida.
Any places where roads are still wet as temperatures drop below freezing could have problems if left untreated.
Expert Senior Meteorologist Alex Sosnowski has been warning about the flash freeze for days now and recommends that people walk and drive "defensively."
Cloudy, cool and showery weather is set to return to Seattle following a warm and dry start to the week.
A late-April snowstorm dumped over a foot of heavy, wet snow across parts of Colorado on Thursday into Friday, boosting snowpack for an extended ski season at local resorts.
Expanding rainfall will bring good news for unusually dry portions of the northeastern United States into the start of May.
Heavy thunderstorms, a few of which will become severe and trigger flash flooding, will target the middle and lower Mississippi Valley into Saturday evening.
Residents of the southeastern United States may feel like the calendar has flipped ahead to Memorial Day weekend with warm and muggy weather in place for the start of May.
Those traveling during the end of the bank holiday weekend across the United Kingdom will face bouts of rain and increasingly gusty winds.
Oklahoma City, OK (1989)
No thunderstorms reported for the entire month of April -- first time on record since 1891.
Pueblo, CO (1990)
16.8" of snow in 24 hours. This tied 24-hour record for April set from April 1-2, 1957.
Alta, UT (1991)
Record April snowfall of 136.2 inches beats the 136 inches set during 1963 and again in 1974. Season total was 580.1"; normal is 486.1".