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
1235 PM CDT Wed Jul 26 2017

...Precipitation...

A few areas of thunderstorms produced heavy rainfall yesterday
morning and then again late afternoon through early this morning.
The highest rainfall amounts were 2 to 4 inches in east central
to southeast Minnesota.  Scattered areas with amounts around a
half to 1 inch extended fron eastern South Dakota and western
Iowa, up across southern Minnesota to northern Wisconsin, and in
northern lower and eastern upper Michihgan.

In the forecast ... thunderstorms will continue to develop today
mainly across Iowa and the north half of Missouri to Illinois,
southern Wiscosnin to northern lower Michigan.  Rainfall amounts
should average 1 to 2.5 inches with locally higher amounts.


...Hydrologic Conditions...

Significant flooding continues in southern Wisconsin, northern
Illinois, and eastern Iowa from multiple rounds of heavy rain over
the last week and a half.  Rivers remaining above moderate flood
stage include the Fox (Illinois), Rock and its tributary
Pecatonica, and the Wapsipinicon.  The Baraboo, Kickapoo, and Des
Plaines Rivers are now in recession and have recently fallen
below moderate stages.  The Rock River at Joslin and Moline is
roughly at crest as a top five to top ten event.  The Wapsipinicon
at Independence is in recession now after a double crest, but
downstream locations are still on the rise toward eventual
moderate to major flood crests.

The Mississippi River is experiencing minor flooding from
Lock and Dam 15 at Rock Island Illinois to Clarksville Missouri,
Lock and Dam 24. The crest is nearly at Lock and Dam 18.

The expected heavy rain has the potential to create new
significant flooding or exasperate flooding on swollen rivers.
If the outcome is similar to last night then just more
localized flooding is expected.

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/sas...





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