The storm threat remains over the Plains and Upper Midwest Monday night as a ridge of high pressure holds strong over northern Illinois. Thunderstorms developing over Nebraska will lift northeast into South Dakota, Iowa and Minnesota during the night but weaken as they move further into the Midwest by Tuesday morning.
Temperatures in the mid 50's Tuesday morning will work to bring highs back up near 80 degrees during the afternoon. Isolated thunderstorms will be possible mid-day Tuesday with a weak wave of energy moving through the jet stream, but may be more focused up over southern Wisconsin.
A better chance for thunderstorms will arrive Wednesday and Thursday with the approach of a cold front from the north. Following a few showers and isolated thunderstorms (non-severe) early Wednesday, we may end up with a decent break in activity through most of Wednesday afternoon. If Wednesday afternoon ends up mostly dry then temperatures will be up back to 80 degrees. Showers and thunderstorms will become more widespread Wednesday evening and night with the arrival of another mid-level disturbance. Heavy rainfall could occur through Thursday morning. The passage of a cold front Thursday keep the thunderstorm threat going into Thursday afternoon and evening. Instability will also be on the increase through Thursday as temperatures and moisture rise. Right now it appears as if the highest severe threat will remain focused to our west, but a couple stronger storms with gusty winds could be possible.
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