Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Sunday could bring areas of flooding to parts of the upper Midwest, central Great Lakes, southern New England and Virginia/North Carolina tidewater region. Read More >

Overview

A stalled frontal system brought a prolonged period of heavy rain to Wisconsin. The rain began in the early morning hours on September 21, 2016, and persisted through the morning of the 22nd. The western portions of the state were hit the hardest, where upwards of 7 inches fell in some locations. Much of the rain in this area fell during the morning of the 21st, resulting in flash flooding in several locations.

Portions of south central Wisconsin also saw quite a bit of rain, with 4-5 inches falling in the Baraboo River Valley. Fortunately, that rainfall was fairly spread out through the day of the 21st, and very little flash flooding was observed in that area.

Herzog

A radar loop from midnight, September21 through 10 am September 22.

Flooding
Rainfall

Hydrographs

While very little in the way of flash flooding was observed within the Milwaukee/Sullivan forecast area, portions of the Baraboo and Wisconsin river valleys did receive an excessive amount of rain. This resulted in river flooding along both of those rivers. Currently, the Baraboo River has reached or is expected to reach flood stage at Baraboo, Reedsberg, and Rock Springs, and the Wisconsin River is expected to reach flood stage at Portage.

Flooding