Hydrometeorological Discussion
Issued by NWS North Central River Forecast Center

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Hydrometeorological Forecast Discussion
NWS North Central River Forecast Center Twin Cities/Chanhassen MN
217 PM CDT Sat Jul 22 2017

...Precipitation...

Yesterday morning several storms moved west to east from South
Dakota across southern Minnesota and northern Iowa to northern
Illinois. Then in the afternoon through last night, more
thunderstorms with heavy rain again moved across this same area,
along with more storms in the northern part of our region across
eastern North Dakota and west central to northeat Minnesota.

The heaviest rainfall since yesterday morning was 4 to 7 inches
across northeast Iowa, southwest Wisconsin, and northern Illinois.
Several areas had 1 to 3 inches of rain in northern Indiana, North
Dakota to eastern South Dakota and across Minnesota.

In the forecast, the main front with the heavier rainfall shifts
out of our area today, with scattered thunderstorm across
Missouri through central and southern Illinois to lower Michigan.
Some scattered showers and thunderstorms with rotate around the
low pressure area moving through farther north.  Rainfall totals
by tomorrow morning should be around a quarter to half inch over
northeastern Minnesota and the northwest half of Wisconsin to
Upper Michigan.

...Hydrologic Conditions...

Significant flooding continues in southern Wisconsin and northern
Illinois, including the following rivers: Des Plaines, Fox
(Illinois), Rock, Baraboo, Kickapoo, and Trempealeau.  The
additional rain from last night, especially in the Rock, Fox and
Des Plaines basins have caused additional rises to already high
rivers.  Some locations on the Rock River may set new records.

The rainfall last night also hit hard in Iowa Rivers including the
Turkey, Wapsipinicon, and Maquoketa.  Those rivers have already
seen, or will soon see moderate to major flooding.  Additionally,
smaller tributaries to the Mississippi and local contributions are
adding to the expected rise on the Mississippi downstream of
Dubuque.  For example, the Grant River at Burton exceeded a record
set in 1950.  The Mississippi is now likely to see moderate
flooding through Burlington Iowa and minor flooding down to lock
and dam 25 near Winfield Missouri.

Additional minor and bankfull rises are being seen in eastern
Iowa, Illinois, and Indiana.  With very little rain in the
forecast for the next few days, we don`t expect to add aditional
flooding in the area.

For additional and more in-depth information concerning river
forecasts, precipitation and all hydrometeorological information
in the NCRFC area of responsibility, please refer to the NCRFC
web page at:     http://www.weather.gov/ncrfc

NCRFC will be staffed 24 hours until further notice.

If no response from this list, call the DOH, SCH or HIC.


$$

...rhr/jmp...





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