Public Information Statement
Issued by NWS St. Louis, MO

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Public Information Statement
National Weather Service Saint Louis MO
905 AM CDT Wed Aug 5 2020

TO:     Family of Services /FOS/ subscribers...
        NOAA Weather Wire Service /NWWS/ subscribers
        Emergency Managers Weather Information Network
        /EMWIN/ subscribers...NOAAPORT subscribers...
        other National Weather Service /NWS/ users, partners,
        and NWS employees

FROM:   Mark Fuchs
        Senior Service Hydrologist
        NWS WFO St. Louis, Missouri

SUBJECT: Changes in flood stages along the Mississippi River.

This morning at 9 AM CDT, the National Weather Service updated flood
stages for 7 different forecast points along the Mississippi River in
the St. Louis Hydrologic Service Area.  Most of these changes reflect
increases in flood stage, an indication that earlier flood impacts
have been mitigated in these communities and no longer exist.

For the Mississippi River at Canton Lock and Dam #20, the previous
flood stage for minor flooding has been 14 feet.  The new flood stage
is now 15 feet.  For the Mississippi River at LaGrange, Missouri, the
previous flood stage was 18 feet.  The new flood stage for minor
flooding is lowered to 17 feet.  For the Mississippi River at Quincy,
the previous flood stage was 17 feet.  The new flood stage for minor
flooding is raised to 19 feet.  At the Lock and Dam #21 below Quincy,
the previous flood stage was 17 feet.  The new flood stage for minor
flooding is 18 feet.  For the Mississippi River at Hannibal, the
previous flood stage was 16 feet.  The new flood stage for minor
flooding is raised to 17 feet.

At Saverton Lock and Dam #22, minor flood stage will remain the same
at 16 feet.  However, major flood stage is increased from 22 feet to
24 feet.  Downstream at Louisiana, Clarksville Lock and Dam #24, and
Winfield Lock and Dam #25, no adjustments are necessary.  Finally,
for the Mississippi River at Grafton, the previous flood Stage for
minor flooding has been 18 feet.  The new flood stage
indicating the threshold for minor flooding is now 20 feet.

Minor flood stage is the forecast or observed level at which the
National Weather Service will consider issuing flood warnings, if
forecast confidence in flood levels is sufficient.  Minor flooding is
characterized by impacts such as private road inundation, bicycle or
pedestrian path closures, cropland or pastureland inundation,
campground flooding or evacuation, or golf course inundation.

Moderate flood stage is the forecast or observed level at which
moderate flooding begins, which may necessitate additional flood
warning.  Moderate flooding is characterized by impacts such as the
inundation of public park structures like gazebos, rest rooms, or
shelters, state-maintained road inundation, or railroad track
inundation.

Major flood stage is the forecast or observed level at which major
flooding begins, which may necessitate additional flood warning.
Major flooding is typically characterized by interstate highway
closure, the inundation of homes and businesses, or public utility
inundation.

The National Weather Service welcomes public feedback.  If you have
any questions or comments about these service changes, please
contact:

Mark Fuchs
Senior Service Hydrologist
National Weather Service Forecast Office
12 Missouri Research Park Drive
St. Charles, MO 63304

Phone:  (636) 447-1876
Email:  mark.fuchs@noaa.gov


$$

WFO LSX


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