Hydrometeorological Discussion
Issued by NWS North Central River Forecast Center

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HMDMSR

Hydrometeorological Forecast Discussion
NWS North Central River Forecast Center Twin Cities/Chanhassen MN
1245 PM CDT Fri Jul 21 2017

...Precipitation...

One round of thunderstorms produced 1 to 2 inch rainfall amounts
across northern Illinois to northern Indiana yesterday morning.
These storms continued eastward producing around a quarter to half
inch of rain in southwest lower Michigan.

Then late yesterday afternoon through last night storms across
central Iowa to northern Illinois produced 1 to 2 inches of rain.
And yet another area late last night through early this morning
developed over eastern North Dakota across southern Minnesota and
in northeast Iowa.  These very efficient slow moving storms were
producing 1 to 2 inches for several locations.

In the forecast...  thunderstorms with the heaviest rainfall will
continue to develop today across southern Minnesota and along
northern Iowa to southern Wisconsin and northern Illinois. Totals
should average around 1 to 3 inches with locally higher amounts in
the stronger storms.  The larger area that should see at least a
half inch of rain covers eastern North Dakota and eastern South
Dakota, across the southwest half of Minnesota, and down across
central Iowa to Indiana to the southwest half of lower 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.  Recent
additional rains yesterday and early this morning have sustained
flooding in these areas.

The rainfall expected today will result in additional significant
flooding.  This could add to the impending crests on the Kickapoo
and Baraboo Rivers, with a potential for new records on the
Kickapoo.  It will also push the Rock, Fox, and Des Plaines Rivers
to higher levels.  Some points that are on recessions from
historically high crests will re-rise, possibly near the previous
crests, and downstream locations that are still rising or near
crests from previous rains will rise even higher.

Additional locations beyond the already listed rivers are also
likely to see rises of the bankfull to minor variety, with some
nearing moderate floods.  This includes locations in southeastern
Minnesota, Wisconsin, eastern Iowa, Illinois, and parts of Indiana
and southern Michigan.

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.


$$

...rhr/jmp...





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