Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 337 AM EDT Mon Apr 18 2016 Valid 12Z Mon Apr 18 2016 - 12Z Wed Apr 20 2016 ...There is a slight risk of severe thunderstorms over South Texas... ...Heavy rain likely over parts of the Southern Plains through Wednesday morning... ...Snow over parts of the Central/Northern Rockies... A nearly stationary front associated with a deep upper-level low will be draped from the Upper Midwest and Great Lakes region southward through the central and southern plains. Moisture from the Gulf of Mexico streaming in ahead of the front will fuel the atmosphere for widespread showers and thunderstorms. Some of the storms may turn severe therefore the Storm Prediction Center has issued a slight risk for portions of the southern Plains today. Heavy rainfall is expected with this weather pattern. Texas will be the most likely area for high rainfall rates over the next couple of days. Southeast Texas has a high risk for flash flooding today, with slight to moderate risk for much of central/eastern Texas and Oklahoma through Wednesday morning. Multi-day accumulations of 3 to 8 inches is forecast from the Ark-La-Tex border to the western Gulf Coast - the highest amounts will be in the vicinity of Galveston, Texas. The showers and thunderstorms will spread into parts of the Middle/Lower Mississippi Valley into Tuesday, as well as, rain developing along and near the boundary over parts of the central and northern plains. Higher elevation snow and lower elevation rain will develop over parts of the Northern/Central Rockies through Tuesday with accumulations up to 1 foot at the highest elevations of Colorado and Wyoming. A cold front will slowly sink through the Northeast and into the Mid-Atlantic region by midweek. Rain will develop along the boundary over the Upper Mississippi Valley and expand into the Upper Great Lakes today. The rain will move into parts of Northern New England moving into parts of the Northern Mid-Atlantic by Tuesday. A few embedded thunderstorms may develop over parts of the Middle Mississippi Valley and parts of the Middle Missouri Valley this afternoon and evening. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php