A cool front will stall in the region on Wednesday which will allow numerous showers and thunderstorms to form. With cloudy skies and rainfall, will keep afternoon highs in the upper 70s, even with southerly wind. Rainfall amounts will near an inch in some spots (much below any flood thresholds).
On Thursday, an area of low pressure will develop in the Upper Midwest allowing a strong cold front to approach during the afternoon. There is now a concern of a possible severe weather outbreak in parts of Eastern Iowa, Wisconsin, and Illinois Thursday afternoon as mid-level winds will be strong and dry. The main threat of damaging wind will be forecast right now but later forecasts may include a chance of tornadoes and very large hail.
The front will sweep through in the evening with a gusty northwest wind. Friday will be a very different day for all of us in the Midwest. Winds will howl out of the north with temperatures only in the upper 60s. Lowering humidities will cause the temperatures to free-fall Friday night with early risers shivering in middle 40 degree temperatures!
This post was written by Eric Sorensen on August 31, 2010