442
NOUS43 KLOT 241459
PNSLOT
SERVICE CHANGE NOTICE
NATIONAL WEATHER SERVICE CHICAGO IL
1000 AM CDT FRI APR 24 2026
TO: FAMILY OF SERVICES /FOS/SUBSCRIBERS…NOAA WEATHER WISE
SERVICE/NWWS/SUBSCRIBERS…EMERGENCY MANAGERS WEATHER INFORMATION
NETWORK/EMWIN/SUBSCRIBERS…NOAAPORT SUBSCRIBERS…OTHER NATIONAL
WEATHER SERVICE/NWS/ CUSTOMERS AND PARTNERS…NWS EMPLOYEES.
FROM: W. SCOTT LINCOLN, SENIOR SERVICE HYDROLOGIST, WFO CHICAGO, IL
SUBJECT: NEW FORECAST SERVICES FOR MCCOOK RESERVOIR IN COOK COUNTY,
ILLINOIS
EFFECTIVE MAY 26, 2026, FORECAST SERVICES WILL BEGIN FOR MAINSTREAM
DEEP TUNNEL AT MCCOOK RESERVOIR (NWS IDENTIFIER MCCI2). FORECAST
SERVICES FOR THIS RESERVOIR WERE DEVELOPED IN COLLABORATION WITH THE
NORTH CENTRAL RIVER FORECAST CENTER, REPRESENTATIVES FROM THE CITY
OF CHICAGO, COOK COUNTY EMERGENCY MANAGEMENT AND REGIONAL SECURITY,
METROPOLITAN WATER RECLAMATION DISTRICT OF GREATER CHICAGO, AND THE
US ARMY CORPS OF ENGINEERS CHICAGO DISTRICT.
IN CONJUNCTION WITH THIS NEW FORECAST SERVICE, ACTION STAGE WILL
CHANGE FROM -40 FEET TO -100 FEET AND MINOR FLOOD STAGE WILL BE SET
AT -30 FEET. RIVER FORECASTS WILL BE ISSUED WHEN WATER LEVELS AT
THIS LOCATION HAVE REACHED, OR ARE EXPECTED TO REACH, THE ACTION
STAGE OF -100 FT.
FORECAST INFORMATION WILL BE AVAILABLE FROM THE NOAA/NWS CHICAGO WEB
PAGE AT WEATHER.GOV/CHICAGO AS WELL AS THE NATIONAL WATER PREDICTION
SERVICE (NWPS) WEB PAGE AT WATER.NOAA.GOV.
IF YOU HAVE ANY QUESTIONS REGARDING THIS CHANGE, PLEASE CONTACT:
W. SCOTT LINCOLN
SCOTT.LINCOLN@NOAA.GOV
815-834-0600 X493
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