Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 301 PM EDT Mon Apr 19 2021 Valid 00Z Tue Apr 20 2021 - 00Z Thu Apr 22 2021 ...Snow continues to spread south into the Central Rockies/High Plains this evening before swinging out into the Central Plains, Midwest, and the Lower Great Lakes on Tuesday... ...Record cold and subfreezing temperatures expected across much of the south-central United States on Wednesday morning... ...Additional rounds of heavy rain to continue across central Florida over the next few days... A late-season upslope snow event is in progress from Wyoming to northern Colorado 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 and central Rockies/High Plains tonight before overspreading much of Kansas and southern Nebraska by early Tuesday morning. As a low pressure wave forms along the sharp cold front, the snow will then swing eastward through the Midwest and the Lower Great Lakes on Tuesday. The highest additional snowfall amounts are expected to occur along the north-central Colorado Rockies, where an additional foot of snow could fall. Meanwhile, over 2 inches of snow is likely across the northern half of Kansas and northwest Missouri. Winter Storm Warnings and Winter Weather Advisories remain in effect for these regions. As the area of low pressure moves towards the Great Lakes on Tuesday, a few inches of wet snow can be expected to accumulate between central Illinois to northwest Ohio. Snow will struggle to accumulate during the daytime hours given the high April sun-angle, therefore much of the snow will stick to grassy surfaces and while falling at night. By Wednesday, much of the wintry precipitation and accumulating wet snow will be found across northern and western portions of New York State and the northern Appalachians. Unseasonably cold air behind this strong cold front will lead to widespread freeze and frost concerns beginning tonight across Midwest and central/southern Plains. Numerous daily record low temperatures are forecast to be tied or broken on Wednesday morning as temperatures dip to around 20 degrees below average. Hard Freeze Warnings and Watches have been issued in eleven states from North Texas to western Ohio. 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 chances should slowly diminish and edge southward into southern Florida. Snell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php