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Service Change Notice
National Weather Service Milwaukee/Sullivan WI
100 PM CDT Mon Apr 28 2025

...Service Change Notice...


To:     Family of Services (FOS) subscribers, NOAA Weather Wire
        Service (NWWS) subscribers, Emergency Managers Weather
        Information Network (EMWIN) subscribers, NOAAPort
        subscribers, National Weather Service (NWS) partners and
        other users, and NWS employees.

From:   Sarah Marquardt
        Senior Service Hydrologist
        NWS Milwaukee

Subject: Change to forecast services for Turtle Creek in south-
         central Wisconsin


Effective May 30, 2025, river forecast services for Turtle Creek at
Clinton, Wisconsin (NWS identifier CLIW3) and Turtle Creek at
Beloit, Wisconsin (NWS identifier BOIW3) will undergo a change.

As automated data is no longer available at BOIW3, areas along
Turtle Creek that were previously provided river forecast services
based on data from BOIW3 will now be served by the upstream gauge of
CLIW3.

With this change, flood impact categories for CLIW3 will be
correlated with impacts in the Turtle Creek river reach extending
from near the confluence of Turtle Creek with Little Turtle Creek
downstream to the confluence with the Rock River.

In addition, the river flood hazard area for Turtle Creek associated
with the CLIW3 river gauge will be expanded to cover the
aforementioned BOIW3 river reach. River flood watches and warnings
based on forecasts from the CLIW3 river gauge will now include
portions of Beloit in Rock County, Wisconsin (previously associated
with river gauge BOIW3) as well as portions of South Beloit in
Winnebago County, Illinois.

River forecasts will be issued when river levels at CLIW3 reach or
are forecast to reach or exceed Action Stage of 6 ft. Listed below
are the current and proposed new flood stages for CLIW3, with
Moderate Flood Stage to increase from 10 to 11 feet.

                Current Flood Stages        New Flood Stages
Action:                 6.0 ft                    6.0 ft
Minor (Flood):          8.0 ft                    8.0 ft
Moderate:              10.0 ft                   11.0 ft
Major:                 12.0 ft                   12.0 ft

These changes were coordinated with representatives from Rock County
Emergency Management, City of Beloit Emergency Management, the
Wisconsin DNR, and the NWS Chicago office.

Forecast and warning information is available from the NOAA/NWS
Milwaukee web page at weather.gov/milwaukee as well as the NOAA/NWS
National Water Prediction Service (NWPS) web page at water.noaa.gov.

If you have any questions or comments regarding this change, please
contact:

Sarah Marquardt
sarah.marquardt@noaa.gov
262-431-5029

or

Scott Lincoln
scott.lincoln@noaa.gov
815-834-0600 x493



$$