There were a few minor adjustments made to the Extreme Heat Warning last night. The National Weather Service removed Jo-Daviess, Carroll, and Stephenson Counties from the warning as slightly lower temperatures and heat index values are expected in those areas. However, the rest of the Stateline remains under the Extreme Heat Warning until 12AM Thursday night.
As for today's forecast, a few isolated thunderstorms remain possible early this morning, but much of the day will feature partly cloudy skies. Despite the slight drop in humidity compared to the past few days, high temperatures remain the same, peaking in the low 90s for the 4th consecutive day. When combined with the lingering humidity, heat index values will approach the 100° mark and may briefly rise above it for an hour or two during peak heating hours.
Along with keeping an eye on the heat, watch for severe potential this evening into tonight. Much of that potential will depend on whether the atmosphere can recover following a round of showers and storms that pass through Wisconsin early in the day. It also will depend on if the frontal boundary responsible for redevelopment remains intact or fizzles out as it slides closer to the Illinois/Wisconsin border.
Highest severe threats will be strong winds, along with frequent lightning and heavy downpours. For that, the Storm Prediction Center has areas under a level 2 of 5 Slight Risk for scattered severe storms. They also have a level 2 of 5 Slight Risk in place for the entire Stateline area tomorrow as a secondary boundary sinks south.
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