Hydrometeorological Discussion
Issued by NWS North Central River Forecast Center

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AGUS73 KMSR 121617

Hydrometeorological Forecast Discussion
NWS North Central River Forecast Center Twin Cities/Chanhassen MN
1116 AM CST Tue Dec 12 2017

Clipper systems from the northwest continued to bring widespread
light precpitation across the RFC in the last 24 hours.
Precipitation totals were generally less than 0.2 inches and
pushed more to the east over the last 24 hours than in some
previous days, falling mostly over Wisconsin and Michigan, with
very light precipitation reaching down into northeastern Iowa and
northern Illinois and Indiana.  As always, precipitation was
heavier on the downwind Great Lakes shores of Michigan, where
totals approached half an inch.  The main difference between the
last 24 hours the the preceeding days was that warmer temperatures
resulted in a mix of rain, freezing rain and snow in many areas.

In the forecast, this weather pattern will continue, producing
widespread 0.1-0.2 inch precipitation with 0.2-0.5 inch totals in
the same areas of Michigan that have been gettin the heaviest
accumulations. Temperatures are borderline freezing so expect a
mix of snow and freezing rain.

...Hydrologic Conditions...
No flooding is expected anytime soon in the NCRFC area but the
threat of ice jam flooding is always a concern.

Due to open water freezing in the northern part of the NCRFC
a dip of reduced flow is working its way down the main stem
Mississippi. This is the first of a series of "ice bite"
events expected. Water temperatures are around the freezing
mark down to L & D 13 but much open water still exists.

The temperature outlook shows some potential for another deep
freeze around Christmas which would freeze up rivers for the
middle portion of the NCRFC creating a second ice bite event.

Navigation on the Mississippi at St. Louis can be greatly
impacted from sharp flow loss or critically low stages.

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

Emergency Call Back List: (in order MAW ... SAS ... ANM)

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



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