Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 AM EDT Fri Apr 20 2018 Valid 12Z Fri Apr 20 2018 - 12Z Sun Apr 22 2018 ...Heavy rain possible over parts of the Lower Mississippi Valley into parts of the Southern Plains... ...Heavy snow possible over parts of the Central Rockies... A storm over the Central/Southern Rockies will slowly move to the Southern High Plains by Saturday evening. The system will produce lower elevation rain and snow over parts of the Central Rockies/Great Basin that will slowly taper off by Saturday evening. Showers and thunderstorms will develop over parts of the Southern High Plains that will move eastward to the Southern Plains by Saturday morning moving into the Lower Mississippi Valley by Sunday morning. Rain will begin to develop over parts of the Central High Plains on Friday morning that will expand into parts of the Middle Mississippi Valley by Saturday morning into Sunday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php