Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 405 AM EDT Mon Oct 09 2017 Valid 12Z Mon Oct 09 2017 - 12Z Wed Oct 11 2017 ...Tropical Depression Nate will slowly become extratropical... ...There is a slight risk of severe thunderstorms over parts of the Central/Southern Plains... ...Heavy rain possible for parts of the Middle Mississippi Valley/Western Ohio Valley... ...Light snow over parts of the Central Rockies... Nate will move northeastward to the Canadian Maritimes by Tuesday morning. Nate is also forecast to become extratropical early Monday morning. Rain with embedded thunderstorms will develop over parts of the Ohio Valley/Lower Great Lakes that will move northeastward to New England by Monday evening then move into Canada overnight Monday into Tuesday morning. A plume of tropical moisture will extend from the Eastern Gulf Coast northward into the Mid-Atlantic that will move off the Mid-Atlantic Coast overnight Monday. Showers and thunderstorms will develop over parts of the Mid-Atlantic into the Southeast and the Eastern Gulf Coast that will move off the Northern Mid-Atlantic Coast by Tuesday morning. In addition, tropical moisture will surge northward over the Central/Eastern Gulf Coast and the Southeast into the Tennessee Valley/Southern Mid-Atlantic by Tuesday morning, too. Likewise, showers and thunderstorms will develop over parts of the Central/Western Gulf Coast/Southeast and move northward into the Tennessee Valley eastward to the Southern Mid-Atlantic by Monday evening into Tuesday and Tuesday evening. In the meantime, a wave of low pressure over the Southern Plains will lift northeastward to the Ohio Valley by Tuesday evening. The associated front will move from the Middle Mississippi Valley into the Great Lakes that will move into the Northeast and merge with the surface low once know as Nate by Tuesday evening. The boundary will extend from the Ohio Valley to the Mid-Atlantic by Wednesday morning. The southern end of the front will move from the Southern High Plains eastward to Middle/Lower Mississippi Valley by Tuesday evening. The system will produce light snow over parts of the Central Rockies that will end overnight Monday. Rain will also develop over parts of the Central Plains through Tuesday afternoon. Showers and thunderstorms will develop along the associated front over the Southern Plains on Monday evening that will move eastward to the Western Gulf Coast and the Lower/Middle Mississippi Valley by Tuesday evening. By Tuesday morning, rain and thunderstorms will move into the Middle Mississippi Valley and the Western Ohio Valley into Tuesday evening. ...more to follow... As an upper level trough digs across the Central Rockies, a surface cold front will sweep across the western U.S. while bringing much colder conditions with it. With the right ingredients in place, a burst of heavy snow across the Central Rockies can be expected throughout Monday. Thus, winter storm warnings and advisories are in place across Colorado and southeast Wyoming. As the upper level trough swiftly moves over the Plains by Tuesday morning, the precipitation along the Rockies will come to an end. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php