Public Information Statement
Issued by NWS Omaha/Valley, NE

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6

839
NOUS43 KOAX 161356
PNSOAX
171356-


Service Change Notice
National Weather Service Omaha/Valley Nebraska
856 AM CDT Tue Oct 16 2018

...Flood stage changes along the Missouri River...

TO:      FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER WIRE
         SERVICE /NWWS/ SUBSCRIBERS...EMERGENCY MANAGERS WEATHER
         INFORMATION NETWORK /EMWIN/ SUBSCRIBERS...NOAA PORT
         SUBSCRIBERS...OTHER NATIONAL WEATHER SERVICE /NWS/
         CUSTOMERS AND PARTNERS...AND NWS EMPLOYEES

FROM:    Suzanne Fortin
         Meteorologist-In-Change
         WFO OMAHA/VALLEY, Valley, Nebraska

SUBJECT: Flood stage changes along the Missouri River

On November 17th, 2018 the National Weather Service will change
several flood stages along the Missouri River. To follow is a
summary of the changes:

(NEBN1) Missouri River at Nebraska City
Previous Action Stage:    16.0 FT  New Action Stage:   17.0 FT
Previous Flood Stage:     18.0 FT  New Flood Stage:    no change
Previous Moderate Stage:  23.0 FT  New Moderate Stage: no change
Previous Major Stage:     27.0 FT  New Major Stage:    no change

(BRON1) Missouri River at Brownville
Previous Action Stage:    31.5 FT  New Action Stage:   33.0 FT
Previous Flood Stage:     33.0 FT  New Flood Stage:    34.0 FT
Previous Moderate Stage:  38.5 FT  New Moderate Stage: no change
Previous Major Stage:     43.0 FT  New Major Stage:    no change

(RULN1) Missouri River at Rulo
Previous Action Stage:    15.0 FT  New Action Stage:   16.0 FT
Previous Flood Stage:     17.0 FT  New Flood Stage:    no change
Previous Moderate Stage:  21.0 FT  New Moderate Stage: no change
Previous Major Stage:     25.6 FT  New Major Stage:    26.0 FT

These changes are the result of observed impacts from recent high
water events and the re-evaluation of other, higher, impacts. Below
is more information about each change.

Action stage is changing at each site to better reflect when high
river levels start to become a widespread concern, but not flooding
in any significant way.

At Brownville, minor flood stage is being raised by one foot. At the
current flood stage level, 33 feet, the river is generally within
bank. Therefore, based on this information and site surveys, a level
of 34 feet will better reflect when flooding becomes significant.

At Rulo, major flood stage is changing to better reflect when major
flooding begins. This level is being set to when the Big Lake levee
overtops.

Please note, the Corps of Engineers does NOT consider Missouri River
flood stages in their decision-making regarding releases from Gavins
Point Dam. Releases from Gavins Point Dam are based on service level
and downstream flood control targets, as outlined in the Master
Manual.

A description of flood categories is available at:
https://w1.weather.gov/glossary/index.php?word=Flood+Categories


Please send any comments or feedback these changes to:

         David Pearson

         Senior Service Hydrologist
         National Weather Service Forecast Office
         6707 North 288th Street
         Valley, Nebraska 68064-9443

         PHONE: 402-359-5732
         EMAIL: david.pearson@noaa.gov
$$
Pearson




USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.