Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 AM EDT Wed May 22 2024 Valid 12Z Wed May 22 2024 - 12Z Fri May 24 2024 ...Deep storm begins to move away from the upper Midwest/Great Lakes today as the next heavy rain and severe weather threats emerge across the southern Plains toward the lower to mid-Mississippi Valley tonight... ...Heavy wet snow expected to overspread the higher elevations of the northern Rockies tonight into Thursday... ...Another rapidly developing low pressure system will bring severe weather and heavy rain threats into the Thursday night into Friday morning... An active weather pattern continues from the western U.S. to the Great Plains where unsettled and changeable weather can be expected for at least the next couple of days. Residents across the upper Midwest into the upper Great Lakes will wake up this morning with a rapidly intensifying low-pressure system passing through. Much of the heavy rain and embedded thunderstorms associated with the system are already moving into southern Canada as the storm center continues to take a north-northeasterly track across the western end of Lake Superior and heading quickly toward southern Canada. Blustery winds behind the departing storm will take extra time to subside today across the upper Midwest and the Great Lakes. As the heavy rain and thunderstorms associated with the deep storm exit the upper Midwest, the southern Plains will need to watch for an emerging threat of heavy rain and severe thunderstorms where the trailing front from the deep storm becomes nearly stationary. The most active weather can be expected tonight as well as Thursday night from the southern Plains toward the lower Mississippi Valley, with a lull in the activities Thursday morning. Meanwhile, the next energetic upper low, which had a history of diving southeast from Alaska, is getting ready to reach the Pacific Northwest. The system will bring a round of widespread precipitation through the Northwest, with heavy wet snow falling across the higher elevations of Idaho, western Montana, and into Wyoming for tonight and into Thursday. The system will also usher a cold air mass through the Northwest by Thursday, reaching into the northern Plains by Friday morning. Windy conditions are also expected to overspread the entire area, especially immediately behind a sharp cold front. Elsewhere, relatively quiet weather is expected across the Southwest. Meanwhile, very warm to hot weather is expected across much of the eastern U.S. today before showers and thunderstorms quickly move into the interior sections later today. The Mid-Atlantic states will see these showers and embedded thunderstorms move in tonight and linger into Thursday as the front becomes nearly stationary across the region. Additional moisture from the South is forecast to ride along the front, bringing rounds of showers and thunderstorms from the Mid-South to the Mid-Atlantic into Friday morning. Across southern Texas, the heat is forecast to gradually intensify through the next few days, with heat indices possibly topping 110 degrees by Thursday afternoon. Residents across southern Florida will also feel the heat getting more oppressive as the week progresses due to gradually increasing humidity under the influence of a high pressure ridge with fair weather conditions. Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php