Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 215 AM EST Tue Jan 29 2019 Valid 12Z Tue Jan 29 2019 - 12Z Thu Jan 31 2019 ...Heavy lake enhanced snow downwind from the Great Lakes that will extend into New England... ...Temperatures will be 20 to 40 degrees below average over the Upper Midwest... ...Dangerous Wind Chills over much of the Midwest and Northern Plains spread into the Ohio Valley... Low pressure over Southern Ontario will move northward into East-Central Canada by Wednesday evening. A deep upper-level low over the Upper Midwest will move northeastward into Eastern Canada by Thursday. The system will produce snow and lake enhanced snow over the Great Lakes through Wednesday night. Rain and snow will develop along the associated front from the Mid-Atlantic southwestward to the Central Gulf Coast that will move eastward off the East Coast by Wednesday afternoon. In addition, snow will expand into parts of the Northeast on Tuesday, ending over most of the Northeast by Thursday. Snow showers will linger over parts of the Central/Southern Appalachians on Wednesday afternoon. Meanwhile, very cold high pressure over South-Central Canada will move southeastward to the Western Ohio Valley by Thursday. The high will bring air that is 20 to 40 degrees below average temperatures that will also bring dangerous wind chills over most of the Mid-West into the Ohio Valley through Thursday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php