Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 235 PM EST Thu Jan 19 2017 Valid 00Z Fri Jan 20 2017 - 00Z Sun Jan 22 2017 ...Severe thunderstorms possible for portions of the Gulf Coast states... ...Heavy snow possible for the California mountains as well as the Mogollon Rim and portions of the central and southern Rockies... Showers and thunderstorms are expected to be widespread tonight in association with a warm front and an upper-level disturbance from portions of the Gulf Coast and Southeast to the Ohio valley and portions of the Great Lakes. Some thunderstorms could be severe across portions of the Gulf Coast. Rain will spread northeast on Friday across portions of the Mid-Atlantic and lower Great Lakes. Farther south on Friday, another round of showers and thunderstorms is expected to develop during the afternoon and evening along the Gulf Coast, some of which could once again become severe. Please refer to products issued by the Storm Prediction Center for further details on the severe weather threat. On Saturday, widespread showers and thunderstorms are once again expected from the Gulf Coast and lower Mississippi valley to the Southeast along and ahead of a developing warm front. A Pacific frontal system will move onshore along the West coast tonight, bringing widespread rain and mountain snow. As the system moves inland, snow will spread into portions of the Great Basin and Four Corners region on Friday. Heavy snow will be possible through Saturday morning for the mountains in California as well as areas from the Mogollon Rim to the central and southern Rockies. By late Saturday into Saturday night, rain and mountain snow will begin to increase once again from central California northward along the coast as another frontal system approaches. Ryan Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php