Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 258 AM EST Wed Feb 13 2019 Valid 12Z Wed Feb 13 2019 - 12Z Fri Feb 15 2019 ...Heavy precipitation expected for the western U.S. and improving conditions for the East Coast... Coastal and lower elevation rain, along with heavy mountain snow, is forecast to continue across much of the western states as multiple fronts move onshore through the end of the week. Conditions will be favorable for very heavy rain along the central and southern California coast and nearby mountains, which will maintain an elevated risk for flash flooding, and possible debris flows near recent wildfire burn scar areas. A moderate to high risk area of excessive rainfall exists across much of southern California on Thursday with a highly anomalous surge of Pacific moisture directed towards this area as part of an atmospheric river event. Widespread heavy snowfall is expected from the Oregon Cascades to the Sierra Nevada, where 1 to 3 feet of snow is likely through the end of the week, and additional heavy snow is anticipated for the northern Rockies as the moisture plume moves inland. The winter storm that has crossed the northeastern U.S. on Tuesday is beginning to exit the East Coast, with lingering snow across much of New England on Wednesday and lake effect snow downwind of the Great Lakes. A band of rain with some embedded thunderstorms is expected across the coastal portion of the Southeast U.S. and Florida early on Wednesday before a cold front advects cooler and drier conditions to the region. Another winter storm system is forecast to develop over the Upper Midwest, Great Lakes, and Northeast regions by the end of the work week as a developing surface low tracks across the region. The corridor of snow and freezing rain with this event will be farther to the northwest compared to the most recent winter storm over the eastern U.S. Hamrick/Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php