First Warn Weather Team

A massive area of high pressure in the upper atmosphere over the southern plains will be expanding, and moving toward the northeast. The net result for the Stateline will be a heat wave starting on Sunday with no definite end in sight at the present time. Temperatures are expected to top out in the low 90's on Sunday, and then vacillating between the low to middle 90's for the rest of the coming week into next weekend, and possibly beyond. It will be mostly sunny, and hot on Sunday with dew points in the low 70's making for very uncomfortable conditions. The winds will be light, too ranging from light and variable to southerly up to 10 mph. That will not help to cool us down very much. On Sunday night there will be a slight chance of thunderstorms as ridge riders over the northern plains slide down the northeast edge of the massive ridge. There will be a continuing slight chance of thunderstorms on Monday, and on Monday night there will be a pretty good chance of storms with a possible mesoscale convective complex moving in from the northwest as a week cool front moves into northern Illinois and stall out for a few hours on Tuesday.  With the front in the area on Tuesday, and copious amounts of Gulf moisture pooling along the front there will be a continuing chance of showers and thunderstorms on Tuesday and end early Tuesday night as the front returns back north as a warm front.  The heat from the plains will kick temperatures up into the middle 90s by Thursday, and dew points could even get into the upper 70's making it very uncomfortable, and possibly dangerous to those who get too much heat exposure.  On Thursday night another cool front will try to make an approach from the north, but fail as it runs into the massive upper level heat producing high just to our southwest.  With a stationary front across southern Minnesota and central Wisconsin to our north, there may be some scattered thunderstorms that develop along it and slide to the southeast into northern Illinois Thursday night and Friday when it will return back to the north as a warm front.  The 90+ temperatures will continue thru at least Saturday.