Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 408 AM EDT Mon Apr 19 2021 Valid 12Z Mon Apr 19 2021 - 12Z Wed Apr 21 2021 ...Snow continues to spread south into central Rockies/High Plains this eveving before swinging out into the central Plains, Midwest, and the lower Great Lakes on Tuesday... ...Heavy showers and thunderstorms continue across central Florida... An upslope snow event is in progress from the northern Rockies to the northern High Plains as a surge of cold air from Canada continues to plunge southward. The cold surge will bring rapidly falling temperatures as well as a quick burst of snow through the northern Rockies/High Plains today before overspreading the central Rockies into the High Plains later today. As a low pressure wave forms along the sharp cold front, the snow will then swing eastward through the central Plains tonight and then across the Midwest and the lower Great Lakes on Tuesday. The highest snowfall amounts are expected to occur along the Bighorn Mountains of north-central Wyoming and along the Front Range of Colorado where over a foot of snow is predicted. Other mountain peaks such as the Black Hills of Wyoming and South Dakota, could see snowfall accumulations of over 6 inches. Winter Storm Warnings and Winter Weather Advisories remain in effect. As the low pressure wave moves across the central Plains towards the Great Lakes on Tuesday, a few inches of wet snow can be expected to accumulate in these areas. Unseasonably cold air behind the low will plunge southward through the southern Plains. Numerous daily record low temperatures are forecast to be tied or broken by Wednesday morning especially over the southern Plains. Meanwhile, active weather is expected to linger across central Florida as low pressure waves develop along a slow-moving front. Occasional showers, heavy at times, together with embedded thunderstorms can be expected to continue through Tuesday. A few storms could turn severe. In addition, flash flooding will be a concern due to upwards of 5 inches of rain forecast to fall across central Florida during the next few days. By Wednesday morning, the rain should slowly be edging into southern Florida. Much of the lower 48 will experience below average temperatures over the next few days. The only exceptions will be found across southern Florida, the Northeast, and along the West Coast where above normal temperatures remain locked in place. Avalanche Warnings are in effect for the Washington Cascades as a result of the recent warm spell. In contrast, Freeze Watches and Warnings across much of the central Plains to the Midwest. Finally, the risk of wildfire will be elevated over parts of the interior western U.S. during the next couple of days. Red Flag Warnings are in effect for parts of Utah into western Colorado. Kong Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php