Widely isolated showers developed Tuesday afternoon and evening and
produced brief heavy downpours. Lightning was absent from most of the
shower activity, so thunder was extremely limited.
The showers developed as an upper level low moved over southern
Wisconsin and northern Illinois. At the surface, there was a weak
boundary (wind convergence line) over northern
Illinois. Cumulus clouds
started to build high in the sky as the low passed overhead. The
quickly rising clouds and boundary near the surface allowed enough
convergence and spin to develop in the atmosphere to produce brief
funnel clouds.
The pictures above were taken shortly after 12:30pm Tuesday afternoon
from Browns Mill Road in Stephenson County, looking to the
east/southeast. The photos are from Patrick
Murray. You'll notice the
funnel isn't very big and is not attached to a thunderstorm cloud.
These types of funnel clouds rarely touch down and typically don't last
too long. If they do touch down, minimal damage can occur.
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