Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 256 AM EST Sat Feb 24 2018 Valid 12Z Sat Feb 24 2018 - 12Z Mon Feb 26 2018 ...There is a slight risk of severe thunderstorms over parts of the Lower Mississippi Valley into the Tennessee/Southwestern Ohio Valleys... ...Heavy snow over the Cascades and Northern Rockies... ...Heavy snow for Upper Mississippi Valley/Upper Great Lakes... ...Rain/freezing rain possible over parts of New England... A wave of low pressure over the Southern High Plains will deepen rapidly while moving to the Upper Great Lakes by Sunday morning and continue to move to James Bay by Sunday evening. The system will produce snow over parts of the Southern/Central Rockies into the Central Plains that will move northeastward into the Upper Midwest by Saturday evening. Buy Sunday evening the snow will move out of the Upper Great Lakes into Canada. The snow will be heavy at times over the Upper Mississippi Valley into the Upper Great Lakes overnight Saturday into Sunday. Showers and thunderstorms will develop along and ahead of the associated front over parts of the Southern Plains into the Lower/Middle Mississippi Valley into parts of the Ohio Valley by Saturday evening. The showers and thunderstorms will move eastward to the Southern Mid-Atlantic/Southeast by Sunday evening, while continuing over the Western/Central Gulf Coast. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php