The summer heat and humidity made a comeback over the weekend with
temperatures rising back above average, reaching the mid and upper 80s
Saturday and Sunday and pushing the heat index back into the 90s. The
return of the muggy conditions, however, also brought back a few
thunderstorms - especially Sunday evening.
Isolated thunderstorms developed over far northwest Illinois and
southwest Wisconsin Sunday afternoon, shifting east during the evening.
The storms were a result of an MCV (mesoscale convective vortex). Think
of this as a small area of low pressure. As that moved into Illinois,
it moved into an environment with quite a bit of instability.
Thunderstorms were quick to grow, but have so far remained below severe
limits locally. There have been a few severe thunderstorm warnings
further north in Wisconsin.
The strongest storms will produce wind gusts 40-50mph and possibly small
hail. Heavy downpours will also occur, producing a quick half an inch
or more for some. Areas along and north of Highway 20 have a higher
chance for thunderstorms Sunday evening, but a few isolated storms may
be possible further to the south. There is a marginal risk for severe
storms Sunday evening, but the risk for storms once these evening ones
pass remain fairly low.
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