New Flood Stage For Dardenne Creek in St. Peters

SERVICE CHANGE NOTICE
NATIONAL WEATHER SERVICE ST LOUIS MO
925 AM CST MON MAY 13 2013

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
        AND PARTNERS...AND NWS EMPLOYEES

FROM:   MARK FUCHS
        SERVICE HYDROLOGIST
        NWS WFO ST. LOUIS

SUBJECT CHANGE IN FLOOD STAGE ALONG DARDENNE CREEK AT ST.
        PETERS MISSOURI EFFECTIVE THIS MORNING AT 9 AM CDT.

THIS MORNING AT 9 AM CDT...THE NATIONAL WEATHER SERVICE UPDATED THE
FLOOD STAGE DARDENNE CREEK AT OLD TOWN ST. PETERS FROM THE PREVIOUS
LEVEL OF 16 FEET TO 18 FEET.  ACCORDINGLY...ACTION STAGE HAS ALSO
BEEN INCREASED FROM 14 TO 16 FEET.  THIS IS A FLOOD-ONLY FORECAST
POINT...MEANING THE NATIONAL WEATHER SERVICE ISSUES STREAM HEIGHT
FORECASTS FOR THIS LOCATION ONLY WHEN THE CREEK IS EXPECTED TO
APPROACH OR EXCEED FLOOD STAGE.

AT ONE TIME...FLOOD WATERS AFFECTED PARK GROUNDS ADJACENT TO BROWN
ROAD AND HIGHWAY C JUST WEST OF THE OLD TOWN AREA OF ST. PETERS WHEN
THE CREEK LEVELS APPROACHED 16 FEET.  HOWEVER...ST. PETERS CITY
ENGINEERS REPAIRED A FAULTY FLAP GATE NEAR THE CREEK CHANNEL THAT
HAS KEPT THESE AREAS FREE OF FLOOD WATERS AT THESE HEIGHTS.  THE
CREEK DOES NOT APPEAR HAVE ANY IMPACT UNTIL IT RISES ABOVE 18 FEET.
ACCORDINGLY...THE NEW ACTION STAGE AND FORECAST ISSUANCE STAGE WILL
ALSO BE ADJUSTED FROM 14 TO 16 FEET.

IN ADDITION...AN AGRICULTURAL LEVEE ALONG HIGHWAY C NORTH OF THE
GAGE HAS ALSO BEEN RAISED BY AT LEAST A FOOT IN RECENT YEARS.  IN
2008...THIS LEVEE WAS OVERTOPPED AT ABOUT 21.4 FEET.  TODAY...THE
LEVEL OF OVERTOPPING APPEARS TO BE ABOUT 22.5 FEET.

DUE TO THESE IMPROVEMENTS...MODERATE AND MAJOR LEVELS HAVE ALSO BEEN
ADJUSTED.  THE MODERATE STAGE HAS BEEN UPDATED FROM 19 TO 20
FEET...WHILE THE MAJOR STAGE HAS BEEN UPDATED FROM 21 TO 23 FEET.
MODERATE AND MAJOR STAGES ARE LEVELS AT WHICH HUMAN IMPACT INCREASES
NOTICABLY.  AT MODERATE LEVELS...NUMEROUS SECONDARY RAOD MAY BE
INUNDATED AND SOME OUTBUILDINGS MAY BE FLOODED.  AT MAJOR
LEVELS...PRIMARY RAODS AND HIGHWAYS CAN BECOME FLOODED ALONG WITH
RESIDENCES AND BUSINESSES.

FLOOD STAGE IS THE STREAM LEVEL AT WHICH MINIMAL HUMAN IMPACT FROM
FLOODWATERS BEGINS...AND THE LEVEL THE NATIONAL WEATHER SERVICE USES
AS A THRESHOLD FOR ISSUING RIVER FLOOD WARNINGS.  ACTION STAGE IS
THE OBSERVED OR FORECAST THRESHOLD LEVEL THE NATIIONAL WEATHER
SERVICE USES TO BEGIN ISSUING FORECASTS.

THE NATIONAL WEATHER SERVICE WELCOMES PUBLIC FEEDBACK.  IF YOU HAVE
ANY QUESTIONS OR COMMENTS ABOUT THESE SERVICE CHANGES...PLEASE
CONTACT:

MARK FUCHS
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



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