Hydrometeorological Discussion
Issued by NWS North Central River Forecast Center

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AGUS73 KMSR 171733

Hydrometeorological Forecast Discussion
NWS North Central River Forecast Center Twin Cities/Chanhassen MN
1133 AM CST Sun Dec 17 2017


During the past 24 hours, light snow fell over the Arrowhead
region of Minnesota and central Lower Michigan.

Rain showers are moving into southern Missouri and southern
Illinois.  The forecast for Missouri and central and southern
Illinois is for 0.1" or less of precipitation during the next 24

Light snow is expected along the Canadian border region Monday and
Monday night.

...Hydrologic Conditions...

With relatively warmer temperatures currently, ice jam formation
potential is somewhat reduced.  A cold snap at the end of this
week could cause new risk in ice jam-prone areas as far south as
northern Illinois.

Currently, several sites across the region are showing signs of
ice effected stages, including advisory levels on the Menominee,
and Trempealeau Rivers in Wisconsin, and the Looking Glass River
near Eagle, Michigan.

The first of a likely series of "ice bite" reductions in flow is
working its way down the main stem Mississippi. Navigation dams
18 through 22 are at their low points from this bite.  With the
next deep freeze coming around Christmas for the middle portion
of the NCRFC, a second ice bite event is possible.

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: JDT ... JMP ... BAC

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



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