Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 239 PM EST Fri Mar 10 2017 Valid 00Z Sat Mar 11 2017 - 00Z Mon Mar 13 2017 ...Turning colder across much of the nation with a couple storm systems having snow potential... Much of the U.S. will have a noticeable change in the weather this weekend and into early next week. A ridge of high pressure will build in over the West which will allow a deep trough to set up over the central and eastern states. With the ridge building in over the West, a vast portion of this region will be dry with mild temperatures. Arctic air will continue to spill into the northern and central states as Canadian high pressure drifts southeast-- resulting in January-like temperatures. Many locations will observe temperatures changes of 15 to 30 degrees colder after the cold front passes. A few snow showers will be possible, along with some lake effect snow for areas downwind of the Great Lakes given the strong cold air advection. Surface cyclogenesis is forecast to develop along this front on Friday near the New England coast and become a powerful nor'easter as it lifts northward across the Canadian Maritimes by Saturday. Accumulating snow is expected from Pennsylvania to southern New England with this system, with some locations receiving four to six inches of snow east of New York City. Another disturbance passing through the central/southern Plains into the Gulf of Mexico will bring another round of rain and thunderstorms to the southern states and snow from the Midwest to parts of the Tennessee valley. Campbell/D. Hamrick Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php