Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 801 AM EDT Mon Mar 26 2018 Valid 12Z Mon Mar 26 2018 - 12Z Wed Mar 28 2018 ...There is a slight risk of severe thunderstorms over parts of the Southern Plains... ...Heavy rain possible from the Southern Plains to the Ohio Valley and over parts of the Pacific Northwest Coast... ...Heavy snow possible over the Cascades, parts of the Northern/Central Rockies, and parts of the Upper Mississippi Valley... A storm over Central/Southern High Plains will slowly move northeastward to the Great Lakes by Tuesday evening. The system will produce snow over parts of the Northern/Central Rockies northeastward to the Upper Mississippi Valley on Monday that will wane over the Northern Rockies/Northern Plains by late Monday night. The snow will end over the Upper Mississippi Valley by Tuesday afternoon as the snow moves into Southern Canada. Showers and thunderstorms will develop over parts of the Central/Southern Plains and the Middle/Lower Mississippi Valley that will expand southwestward along and ahead the associated dryline/front by Monday evening. Overnight Monday, the showers and thunderstorms will intensify with heavy rain at times over the Middle Mississippi Valley. The showers and thunderstorms will be confined to Texas and the Lower Mississippi Valley by Tuesday evening. As the Northern half of the storm moves northeastward, rain will develop over parts of the Central Plains and the Middle/Upper Mississippi Valley on Monday afternoon that will expand into parts of the Upper Great Lakes/Ohio Valley by Monday evening. The rain continues to spread eastward into the Ohio Valley/Great Lakes by Tuesday morning and into of the Lower Great Lakes/Central Appalachians by Tuesday evening. The rain will end over the Upper Mississippi Valley by Tuesday afternoon. Meanwhile, upper-level energy in a deep upper-level trough over Southern California into the GreatBasin/Northern Rockies will develop into an upper-level low over the Southwest by Tuesday morning that will slowly begin to weaken by Tuesday evening. The energy will develop snow over parts of the Central Rockies into parts of the Southwest overnight Monday. By Tuesday evening the snow and lower elevation rain moves into the Southern/Central Rockies. In addition, showers and thunderstorms will develop over the Southern High Plains on Tuesday afternoon into Tuesday evening. Additionally, upper-level energy moving over the Northwest and onshore flow will aid in producing coastal rain and higher elevation snow will develop over the Pacific Northwest that will continue through Tuesday evening. Snow will also develop over parts of the Northern Intermountain Region/Northern Rockies Monday evening into Tuesday evening. Discussion was delayed due to communication problems. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php