As cool Canadian high pressure recedes to the east, southerly winds return to Chicago,
bringing warmer and noticeably more humid air back into the area. An approximate
two-day period of mid-summer-like heat, humidity and thunderstorms is expected to
begin later tonight. As a cold front approaches from the west, strong storms with heavy
downpours become more likely later Monday into Tuesday. Monday-Tuesday rainfall
totals could easily exceed two inches at many metro area observation points. The
southern portion of cooler less humid Canadian high pressure should hold over the
Midwest Wednesday and Thursday, with a shift in the jet stream flow allowing an
increasing southerly flow and the return of warm humid air next weekend.
--By Paul Dailey, WGN Weather Center Meteorologist
TROPICAL STORM BERTHA COULD BECOME HURRICANE THIS WEEK
