A large ridge of heat is building in the eastern two-thirds of the country while a low pressure system is forming over Wyoming and Colorado.
High temperatures in parts of Texas and Oklahoma are expected to hit triple digits Tuesday. The heat and low humidity in the Southwest have triggered red flag warnings from Arizona all the way into Kansas. The fire danger will remain high through at least the middle of the week.
Once the Colorado low and the trailing cold front move east on Wednesday, the middle of the country will begin to see thunderstorms firing along the front. This system has a lot of support through all the layers of the upper atmosphere, creating ideal conditions for damaging straight-line winds.
Wednesday's threat for severe weather spans from south Texas all the way into Minnesota, all of Wisconsin, and into the upper peninsula of Michigan. On Thursday, that same threat shifts slightly to the east.
The surface low will cut eastward across the middle of the country, so the biggest threat for this severe weather will likely be centered over portions of the Midwest and Upper Midwest.
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