Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Mon Apr 23 2018 Valid 12Z Mon Apr 23 2018 - 12Z Wed Apr 25 2018 ...Heavy rain possible over parts of the Central/Southern Appalachians and the Southern Mid-Atlantic... ...Snow possible over parts of the Northern Rockies/Northern High Plains... A storm over the Tennessee Valley will slowly move eastward to the Southeast/Southern Mid-Atlantic by Tuesday evening. Showers and thunderstorms will develop along and ahead of the associated front over parts of the Tennessee Valley into the Southeast moving off most of the Southeast Coast except for parts of the Florida Peninsula and the Southern Mid-Atlantic by Tuesday evening. Rain will also develop over parts of the Middle Mississippi and Ohio Valleys that will expand into parts of the Central Appalachians and the Northern Mid-Atlantic by Monday evening. The rain will move into parts of the Great Lakes and the Northeast on Tuesday morning into Tuesday evening. Meanwhile, upper-level energy over the Northern Rockies will move southeastward to the Central Plains/Central Rockies by Tuesday evening. The energy will aid in producing higher elevation snow and lower elevation rain over parts of the Northern Rockies/Northern High Plains that will move southeastward into parts of the Central Rockies overnight Monday into Tuesday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php