Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 221 PM EDT Fri Apr 15 2016 Valid 00Z Sat Apr 16 2016 - 00Z Mon Apr 18 2016 ...Heavy snow expected for portions of the Rockies and Front Range... ...Heavy rain and severe thunderstorms possible Saturday for portions of the central and southern plains... ...Dry conditions and above average temperatures expected for the Great Lakes, Mid-Atlantic, and Northeast... A slow-moving low pressure system will move across the Four Corners region tonight, while a cold front becomes stationary across the central and northern plains. Snow will become more widespread by this evening across the central Rockies, and will gradually spread to lower elevations as colder air moves into the Front Range and foothills -- changing rain to snow in these areas overnight. Snow will continue across the Rockies, Front Range, and foothills into Saturday, with heavy snowfall accumulations possible. Rain will also mix with snow across portions of western Nebraska on Saturday before changing to mostly snow by Saturday night into Sunday. Farther east, on the warm side of the frontal boundary, showers and thunderstorms are expected to be widespread tonight into Saturday morning across portions of the southern and central plains -- and will continue through Sunday due to the lack of movement of the frontal boundary. Heavy rain may lead to flooding for some areas due to the long duration of the rainfall event and numerous showers and thunderstorms potentially affecting the same areas. Additionally, the Storm Prediction Center is forecasting a chance of severe thunderstorms both tonight and Saturday across portions of the southern and central plains. Elsewhere, a weakening frontal boundary will keep scattered showers and thunderstorms a possibility for portions of the southeastern states tonight -- these will become more limited to Florida on Saturday as the front weakens. Farther north, a pleasant weekend is in store for the Great Lakes, Mid-Atlantic, and Northeast, as high pressure will dominate the weather pattern. Dry conditions and above average temperatures are expected. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php