The latest AccuWeather regional radar shows showers over Kansas that change to snow showers over the High Plains of eastern Colorado. Those showers are moving east but will not do much in Kansas since there is insufficient instability for major thunderstorms to form.
However, once the low pressure in the upper atmosphere reaches Missouri — where unstable air will reside by sunrise — thunderstorms with large hail will develop. The map below is valid at 5am CST Friday.
At 8am, the strongest storms (possibly still producing hail) are forecast to be in the general vicinity of St. Louis.
As temperatures in the in the Ohio and Tennessee River Valleys rise after mid-morning tomorrow, the modest thunderstorms will grow in number and intensity to where widespread severe thunderstorms are in progress by around 2pm.