Public Information Statement
Issued by NWS Des Moines, IA

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Public Information Statement
National Weather Service Des Moines IA
1100 AM CDT Thu May 25 2017

...Changes to River Forecast Services in Central Iowa...

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/ Customers and Partners, NWS
          Employees

From:     Jeffrey Zogg
          Senior Hydrologist, NWS Des Moines IA

Subject:  Changes to Action Stage, Flood Stage and Flood
          Severity Categories for the Middle River near
          Indianola IA, Effective Immediately


...Changes to Action Stage, Flood Stage and Flood Severity
Categories for the Middle River near Indianola IA /Site ID of
IDNI4/, Effective Immediately...

Relocation of the USGS streamgage associated with NWS river
forecast services for this location has necessitated an immediate
change to the Action Stage, Flood Stage, Moderate Flood Stage and
Major Flood Stage. These changes are effective immediately since
the USGS streamgage was relocated on May 24 2017.

As has been the case for IDNI4, forecasts and warnings will
continue to be valid along the reach of the Middle River extending
from Clanton Creek near Spring Hill to the Des Moines River.

The NWS will provide river forecasts when the observed or forecast
stages go above the Action Stage. In addition, the NWS will issue
river Flood Warnings and follow-up river Flood Statements when the
observed or forecast stages go above the Flood Stage. Below are
the new stage thresholds for IDNI4, along with the changes from
the present values

* Action Stage: 15.5 ft. Decrease of 3.5 ft.
* Flood Stage and Minor Flooding: 19.5 ft. Decrease of 3.5 ft.
* Moderate Flooding: 22.5 ft. Decrease of 3.5 ft.
* Major Flooding: 24.5 ft. Decrease of 3.5 ft.


The Middle River near Indianola is a real-time U.S. Geological
Survey /USGS/ streamgage which provides stage and discharge data.
This streamgage has a period of record back to 1940. It is
maintained by the USGS Iowa Water Science Center and is funded
cooperatively by the U.S. Army Corps of Engineers Rock Island
District, the Iowa Department of Transportation and the USGS Water
Science Center in Iowa City.


...Concluding Remarks...

As with other NWS river forecast points, river forecasts for the
above location will be available on the NWS Advanced Hydrologic
Prediction Service /AHPS/ Website. In addition, river forecasts
for this location will be updated as needed while the stream
remains at or above the Forecast Issuance Stage. At a minimum, the
river forecasts will be updated once per day in the morning, when
either the observed or forecast stage is at or above the Forecast
Issuance Stage.

More information is available on our Website at:
http://www.weather.gov/desmoines .


The NWS welcomes public feedback. If you have any questions or
comments on this change, please contact:

     Jeffrey Zogg
     National Weather Service Forecast Office
     9607 NW Beaver Drive
     Johnston Iowa 50131-1908

     Phone 515-270-4501 x493

$$

Zogg



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