Rare January t-storms threaten flooding
For only the second time this month, thunder may accompany rainfall later Wednesday. South winds predicted to reach 75 m.p.h. just a mile above Chicago are forcing unusually mild air over the area’s extensive snow cover. Dense fog has resulted as the chilly surface cools the air, producing condensation.
Downpour generating t-storms and the prolific runoff generated as melting snows free 0.50” to 1.50” of water trapped in the area’s snowpack, threaten widespread flooding. Ice dams—the buildup of chunks of ice as above freezing temps reach area river basins—and snow-clogged storm sewers threaten extensive flooding. An incoming flood of frigid air Thursday may complicate matters by turning standing water to ice later Thursday/Thursday night. Thundery weather has occurred already this month on Jan. 1. Additional t-storms late today would mark the 10th time since 1871 that a January has produced two or more days of t-storms.
-Tom Skilling