Skies have been pretty dry and temperatures comfortable following
Monday's derecho event which produced a total of 15 tornadoes across
northern Illinois. Four of those tornadoes occurred in the immediate
viewing areas of Winnebago, McHenry, Boone and DeKalb counties. High
pressure was quick to build for the remainder of the week leaving skies
dry through Friday night.
A quickly advancing cold front over the Plains and Midwest will pass
through Wisconsin and Illinois Saturday. Severe thunderstorms have
developed
along the front Friday evening with numerous tornado warnings
ongoing in Minnesota. The risk for strong to severe storms will remain
across the Midwest and Plains Friday evening, with cloud cover
increasing locally overnight. Temperatures will dip into the mid 60s
for the start of Saturday.
A few light showers may be possible before sunrise Saturday but with
drier air overhead a lot of the rain will fizzle out before reaching the
Stateline. An earlier arrival of the cold front Saturday means most of
the storm activity for the afternoon will develop
along and east of
I-39, and closer towards Chicago and Indiana during the late afternoon
and evening. While a few isolated thunderstorms will be possible for
the immediate area early afternoon, there remains a higher chance for
strong/severe storms to the east. This is where the Storm Prediction
Center has placed the 'marginal risk' for severe storms during the
afternoon. Locally, a few gustier storms may be possible but will
remain rather isolated. Drier air along with high pressure will help
clear skies Saturday night and heading into Sunday.
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