Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 303 PM EST Mon Nov 28 2022 Valid 00Z Tue Nov 29 2022 - 00Z Thu Dec 01 2022 ...Severe thunderstorms expected for portions of the lower Mississippi Valley along with possible flash flooding on Tuesday... ...Light to moderate snowfall will likely impact the central High Plains into the upper Mississippi Valley late tonight through Tuesday... ...Strong Pacific storm system to begin impacting Washington and Oregon Tuesday night with heavy rain and snow along with strong winds... As an upper level trough begins to shift eastward into the Great Plains tonight, low pressure at the surface will organize over Kansas, eventually tracking into the upper Great Lakes region for Tuesday night. Snow will develop eastward from the central Rockies into Nebraska along with gusty winds tonight, creating dangerous travel conditions due to reduced visibility across the region. A swath of light to moderate snow is expected to translate northeastward into portions of southern Minnesota, northwestern Wisconsin and the Upper Peninsula of Michigan. Lake effect snow showers are expected to enhance snowfall totals into the 6-12 inch range for portions of northwestern Wisconsin into Michigan with colder air moving in behind the system's cold front, In fact, a significant drop in temperature is expected behind the cold front for much of the Colorado Front Range into the central Plains with a 20 to 30 degree drop in maximum temperatures anticipated between today and Tuesday. As the strong cold front advances eastward, severe storms and heavy rainfall are expected for portions of the lower/middle Mississippi Valley into a portion of the Gulf Coast states. A Moderate Risk of severe thunderstorms (Storm Prediction Center) and Slight Risk of excessive rainfall (Weather Prediction Center) is in place on Tuesday for much of the lower Mississippi Valley. A few strong/long-track tornadoes will be possible from eastern Arkansas, northeastern Louisiana into the northern half of Mississippi with this storm system. By mid-week, a significant Pacific storm system is forecast to reach the Pacific Northwest. An occluded frontal system will near the coast of the Northwest Tuesday night, bringing areas of heavy lower elevation rain and heavy mountain snow. Through Wednesday night, the heaviest snowfall accumulations, some in excess of 1-2 feet, will impact the Washington Olympics and Cascades. Lowering snow levels are also expected to impact many mountain passes and lower elevation communities with snowfall later in the week. Otto Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php