Thanks to bullish, blocking high pressure aloft over the eastern Great Lakes northward into Labrador (eastern Canada), a dip in the jet stream, or trough, will dig into the nation's heartland, then get blocked and end up closing off into a vigorous, nearly-stationary closed low.
The first effect of this will be a return of stubborn, chilly air to the Plains.
(MORE: Extreme Temperature Drops this Week)
Mid-to-late-week highs in the 40s, possibly even 30s in some spots, can be expected in parts of the Plains and Midwest, not to mention the Front Range of the Rockies.
(HIGHS: Wed. | Thu. | Fri. | Sat.)
That fresh cold air will set the stage for what will be a snowy couple of days from the Front Range of the Rockies to parts of the Plains and Midwest.

More Rockies, Midwest Snow Ahead

Tracking The Storm

Snow Forecast

Tracking The Storm

Tracking The Storm

• Rockies Snow - Denver, Colo. and Cheyenne, Wyo. are a couple of the cities that will see snow with a cold front diving south Tuesday night into Wednesday. Amounts could top a foot in portions of Wyoming! Parts of the Denver metro area could pick up 6 inches or more. This comes after an April where snowfall was 20 inches above average in Cheyenne and 11 inches above average in Denver.
• Plains, Midwest Snow Too? - Wednesday night through Thursday, portions of the Plains and Upper Midwest near the closed upper-low could see some wet snow. Parts of Minnesota, western Wisconsin, Iowa and Nebraska seem most likely to see this, but flakes could also fly in Kansas, and even Missouri, where accumulating snow is extremely rare in May. Our most reliable computer models are even putting northern Oklahoma in play for some light snow - stay tuned! Minneapolis,