Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 328 PM EDT Thu Apr 25 2019 Valid 00Z Fri Apr 26 2019 - 00Z Sun Apr 28 2019 ...There is a slight risk of severe thunderstorms over parts of the Central/Eastern Gulf Coast... ...There is a slight risk of excessive rainfall over parts of the Ohio Valley and the Central Gulf Coast... ...Heavy snow possible over parts of the Northern Plains to parts of the Upper Great Lakes... ...Temperatures will be 10 to 15 degrees above average over parts of California and the Southwest... Low pressure over the Tennessee Valley will move northeastward to Northern New England by Saturday. The system will produce showers and thunderstorms along and ahead of the boundary from the Southern Ohio and Tennessee Valleys to the Central Gulf Coast that will move into the Mid-Atlantic to the Southeast by Friday morning and off the East Coast by Friday evening. Heavy to excessive rainfall and flash flooding will be possible with this activity, too on Thursday into Friday morning. Rain will also develop over parts of the Ohio Valley, Middle Mississippi Valley, and into parts of the Great Lakes that will move eastward to the Northeast/Northern Mid-Atlantic by Friday morning. The Rain will move into Eastern Canada on Saturday with showers lingering over the Northeast. Energy over the Eastern Pacific will move onshore over the Pacific Northwest and intensify while moving to the Middle Mississippi Valley by Saturday. Overnight Thursday, rain and highest elevation snow will develop over parts of the Northern Intermountain Region expanding into the Northern/Central Rockies by Friday evening. Overnight Friday, snow will develop over parts of the Northern Plains that will move eastward to the Middle/Upper Mississippi Valley and the Upper Great Lakes by Saturday evening. Similarly, showers and thunderstorms will develop along and ahead of the associated cold front over parts of the Central Plains into the Southern High Plains overnight Friday. Rain with embedded thunderstorms will move into the Central/Southern Plains by Saturday morning and rain will move into parts of the Middle Mississippi Valley by Saturday evening. Additional upper-level energy will move into the Pacific Northwest on Saturday. The energy will trigger rain and higher elevation snow over parts of the Pacific Northwest into parts of the Northern Rockies on Saturday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php