Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 356 AM EDT Thu Mar 27 2014 Valid 12Z Thu Mar 27 2014 - 12Z Sat Mar 29 2014 ...There is a slight risk of severe thunderstorms over parts of the Middle/Lower Mississippi Valley... ...Heavy rain possible along the Central Gulf Coast... ...Heavy rain possible over parts of Northern California... A storm over the Central Plains will move the Great Lakes and move into Southeastern Canada by Friday evening. The system will produce showers and thunderstorms over parts of the Central/Southern Plains will move eastward to the Southern Appalachians and the Eastern Gulf Coast by Friday. Snow will develop over parts of Upper Great Lakes/Northern Plains that will move into Southeastern Canada by Friday afternoon. Rain will also develop over parts of the Middle Mississippi Valley that will move into the Northeast/Mid-Atlantic on Friday. A wave of low pressure will develop over the Lower/Middle Mississippi Valley on Friday evening redeveloping showers and thunderstorms over the region. Meanwhile, upper-level energy moving over the West Coast eastward to the Mississippi Valley by Friday. The energy will produce snow over parts of the Northern/Central Rockies and the Northern Intermountain Region that will move into parts of the Northern/Central Plains by Friday morning. In addition, onshore flow will aid in producing rain along the coastal regions of the Pacific Northwest/Northern California with snow at higher elevations on Thursday. A new front will begin to come onshore over the Pacific Northwest aiding in producing rain over the area on Friday. Snow will also develop over parts of the Northern Intermountain Region by Friday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php