High pressure anchored over the Midwest and Great Lakes this week has
kept the threat for measurable rainfall very limited for most in the
Stateline. Isolated showers and thunderstorms did develop Tuesday and
Wednesday afternoon, but were focused more over southwest Wisconsin and
northwest Illinois.
There hasn't been much moisture in the atmosphere due to northerly winds
in the jet stream coming in from Canada and high pressure near the
surface. High pressure is associated with sinking air, and in order to
get thunderstorms to develop, or even rain clouds, air needs to be
rising. There were a couple weaker upper level disturbances Tuesday and
Wednesday that allowed some of the air to rise, but it remained fairly
weak.
High pressure will continue to dominate our skies through the end of the
week as it shifts into the southeastern part of the country. This will
allow our winds to begin to shift around to the south by the weekend.
Rain chances will remain limited going into the weekend until a cold
front moves down from the north. That front will come through Monday
morning bringing our first chance for more widespread and measurable
rainfall in over a week.
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