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
1004 AM CST Mon Dec 18 2017

...Precipitation...

Rain showers moved across southern Iowa, Missouri, Illinois,
southern Wisconsin, northern Indiana, and southern Lower Michigan
during the last 24 hours.  Reports were generally less than 0.1"
with isolated reports of over 0.25".  Light snow fell over
portions of northern Wisconsin, the Upper Peninsula of Michigan,
and northern Lower Michigan.  Most reports were less than 0.1".

Snow is forecast across the northern tier of states during the
next three days.  Total snowfall water equivalents could be as
high as 0.5".  Higher amounts will be along the Canadian border.

...Hydrologic Conditions...

With relatively warmer temperatures currently, ice jam formation
potential is somewhat reduced.  Locations experiencing recent jams
have stabilized and most have dropped below advisory levels,
including the Trempealeau in Wisconsin, and the Looking Glass near
Eagle, Michigan.  A cold snap at the end of this week could cause
new risk in ice jam-prone areas as far south as northern Illinois.

The first of a likely series of "ice bite" reductions in flow is
working its way down the main stem Mississippi. Navigation dams
20 through 25 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.


$$

...bac/jmp...





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