Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 143 PM EST Thu Dec 20 2018 Valid 00Z Fri Dec 21 2018 - 00Z Sun Dec 23 2018 ...Severe storms possible across southern Florida this evening with a heavy rainfall and flooding threat extending from the Southeast into the Mid-Atlantic and the Northeast... ...Record mild temperatures into the Northeast on Friday... ...Another system will bring more rain and snow to the Northwest... A significant storm system currently located in the Southeast U.S., will push quickly north and eastward spreading heavy rainfall across much of the Eastern U.S. through Friday. Given significant moisture associated with this system, flooding and flash flooding will be a threat along and ahead of the cold front -- WPC has a slight risk highlighted on the excessive rainfall graphic across the Florida/Southeast and from the Mid-Atlantic/central Appalachians to coastal New England. Flood watches are in effect from the central Mid-Atlantic to parts of the Northeast. In addition to heavy rainfall, severe weather capable of producing tornadoes is possible across parts of southern Florida this evening. Ahead of the system, temperatures will be well above normal across much of the Northeast into Friday, with record highs possible in the Philadelphia to Boston corridor. Behind the front, cooler air filter in allowing for accumulating snowfall across the lower Great Lakes and western slopes of the Appalachians Friday into Saturday. Yet another system moving into the Northwest will continue to bring heavy rain and mountain snows from coastal Washington/Oregon and into northern California tonight. Conditions dry out a bit in the Pacific Northwest on Friday in between systems, but lower elevation rains and heavy mountain snows should move through parts of the Intermountain West and Rockies. Ahead of the system, temperatures from the Front Range into the Plains will be well above normal into the weekend. Across the rest of the Northwest, temperatures will be near to below normal before another round of heavy rainfall and high elevation snows move into the Pacific Northwest by Saturday afternoon and evening. Santorelli Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php