Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Mon Apr 21 2025 Valid 00Z Tue Apr 22 2025 - 00Z Thu Apr 24 2025 ...Mixed rain and snow over the upper Great Lakes tapering off as low pressure system moves into Canada... ...Rounds of scattered showers and possibly severe thunderstorms develop over the central Plains beginning later on Tuesday... A low pressure system tracking across the upper Great Lakes this Monday afternoon is forecast to move farther into southeastern Canada through the next couple of days. Mixed rain and wet snow as well as gusty winds across the upper Great Lakes will gradually taper off this evening. Showers and thunderstorms associated with the trailing cold front will sweep across the Northeast through tonight along with gusty winds. Farther south, only scattered showers are expected to pass through the Mid-Atlantic tonight. Across the Deep South, showers and thunderstorms are expected to linger through the next couple of days as the trailing front stalls across the region. Moisture from the Gulf will then gradually stream northward into the southern and then the central Plains through Wednesday as southerly flow strengthens. Rounds of scattered showers and possibly severe thunderstorms can be expected to develop from time to time beginning later on Tuesday with increasing frequency going into Wednesday as a low pressure wave is forecast to develop over the southern High Plains. Over the northern Rockies, mountain snow will gradually taper off tonight as an upper-level trough passes through and heads into the northern Plains. This trough will then bring a round of rain showers with embedded thunderstorms tonight into Tuesday across the northern Plains into the upper Midwest where a weak occluded cyclone passes through. Meanwhile, much of the Southwest as well as Florida will remain dry through Wednesday. Temperatures will average above normal across a large portion of the country while cooler than normal conditions will be confined to the Pacific Northwest and into the northern Plains. Kong Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php