Flood Potential Outlook
Issued by NWS Milwaukee/Sullivan, WI

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FGUS73 KMKX 172031

Hydrologic Outlook
National Weather Service Milwaukee/Sullivan WI
231 PM CST Sat Feb 17 2018

...Long Duration Rainfall Could Result In Flooding...

There is increasing concern that the period Monday through
Tuesday night could result in parts of south central and southeast
Wisconsin seeing flooding as a result of persistent rainfall.

A frontal boundary will push into the area and stall, acting as a
focus for repeated rounds of moderate to possibly heavy rainfall.

We have an existing icy snowpack with high moisture content and
the ground is still deeply frozen. One to 2 inches of rain falling
on these surface conditions is an ideal setup for efficient and
rapid runoff. This could cause smaller rivers and streams to flow
out of their banks.

Thunderstorms are also possible in the southeast. If heavy rain
accompanies these storms, flash flooding becomes a concern.

There is still some uncertainty as to just where the heavier rain
bands will set up, it could shift south into Illinois, or even a
bit farther north.

For now, prepare for the potential of this heavy rain and possible
flooding across southern Wisconsin during the Monday through
Tuesday night timeframe. If flooding does occur, it would persist
through much of the week ahead.


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