This is going to be a very nasty storm in the end. Given that we have just about every weather situation that will happen through the weekend, including snow, tornadoes, tropical storm and heavy rains. The tornado outbreak, I think, has the potential to be the worse than any tropical storm or blizzard because if one large tornado hits a town or city, it will cause extensive damage. In contrast, if Tropical Storm Karen forms in the Gulf of Mexico, impacts will be mainly gusty winds under 50 mph and flooding rains.
The snow from Wyoming into Nebraska and South Dakota will be heavy and in some areas, combination of the high winds and snow will create blizzard conditions. I do expect a lot of travel problems through that area.
The severe storms will march east Saturday and Sunday, and I do think there is a risk of tornadoes through the weekend despite the fact that wind damage and hail will be the main impacts.
Upper-level storm will bring heavy rains to the mid-Atlantic.
An upper low will dive into the Ohio Valley producing an area of heavy rain.
A front settles down into Texas and causes heavy rains.
Severe storms over the High Plains. Video looks at the tropical issues coming up.
Tropics may produce storms that could impact the U.S.
The heavy storms return to the Midwest, some with hail and heavy rains.