After days of dangerous heat, a powerful shift in the atmosphere is now unleashing severe storms across the Plains and Midwest — and the worst may arrive by Monday.
For days, a stagnant weather system called an Omega block trapped extreme heat across the Central U.S. — but that pattern is now breaking down, and what’s coming in its place could be far more dangerous.
As the high-pressure system at the center of the Omega block flattens, a series of powerful storm systems is pushing into the Great Plains. The National Oceanic and Atmospheric Administration (NOAA) has placed central Kansas — including Wichita — under a Level 2 out of 5 severe thunderstorm risk.
Forecasters say a mid-level atmospheric wave pushing eastward, combined with a developing dryline, is creating the perfect recipe for explosive storm development. All the ingredients needed — wind shear, moisture, and instability — are now falling into place.
“A series of subtle shortwave troughs moving through this environment will likely trigger scattered to numerous thunderstorms during the afternoon and evening hours.” — Storm Prediction Center
There is one factor that could suppress the storms initially: a “stout cap” — a layer of warm air several thousand feet above the ground that can delay or prevent thunderstorm development. But forecasters warn this lid won’t hold for long.
If storms break through, residents could face hail up to 2 inches wide, damaging straight-line winds, and in some areas, the threat of tornadoes — particularly where supercell thunderstorms develop.
Day-by-day breakdown
Friday – Saturday
Severe storm threat develops across central Kansas and surrounding areas. Large hail and damaging winds are the primary hazards as the dryline activates.
Saturday – Sunday
A more powerful area of low pressure develops, pulling additional moisture northward. Eastern Nebraska and western Iowa become the bullseye for supercell storms capable of producing large hail, damaging winds, and tornadoes. Des Moines, Iowa and Minneapolis, Minnesota face a Level 1 flash flood threat.
Monday onward
The storm threat expands dramatically. A Level 2 out of 5 severe risk stretches from northern Wisconsin all the way south into northern Texas. An upper-level trough over the western U.S. drives strong southwesterly flow, fueling additional rounds of heavy rain and severe weather to kick off the new week.
Residents across the affected corridor — from the central Plains through the upper Midwest — are urged to monitor local forecasts closely, have a plan in place for severe weather, and be ready to act quickly if warnings are issued.
The storm pattern is expected to remain active and potentially intensify through early next week as extreme moisture and strong wind shear continue to interact across the region.
