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NOUS43 KGRR 201651
PNSGRR
MIZ072-221700-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1151 AM EST THU FEB 20 2025
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: ANDREW DIXON
SERVICE HYDROLOGIST
GRAND RAPIDS, MI
SUBJECT: REVISIONS OF FLOOD CATEGORY STAGES FOR THE PORTAGE RIVER
AT VICKSBURG (VCKM4)
EFFECTIVE FRIDAY, MARCH 21, 2025, THE NATIONAL WEATHER SERVICE (NWS) IN
GRAND RAPIDS, MI WILL CHANGE THE FLOOD CATEGORY STAGES FOR THE
PORTAGE RIVER NEAR VICKSBURG (VCKM4).
ALL NWS FLOOD WARNINGS, FLOOD STATEMENTS, FLOOD ADVISORIES, FLOOD
WATCHES, PROBABILITY OUTLOOKS, AND NWS HYDROGRAPHS ON THE NATIONAL WATER
PREDICTION SERVICE (NWPS) WILL REFERENCE THE NEW CATEGORY
LEVELS. THIS CHANGE IS PART OF A RECENT EVALUATION OF THE LEVELS
BASED ON HIGH WATER, FLOOD EVENTS, AND IMPACTS OVER THE PAST 10
YEARS.
THE NEW FLOOD CATEGORIES WILL BE AS FOLLOWS (ALL VALUES AT LEVEL
ABOVE GAGE ZERO DATUM).
PORTAGE RIVER AT VICKSBURG:
GAGE ZERO DATUM: 839.513 FT ABOVE MSL NGVD29
NEW FLOOD CATEGORIES PREVIOUS FLOOD CATEGORIES
-------------------- -------------------------
ACTION STAGE: 4.5 FT ACTION STAGE: 5.0 FT
MINOR FLOOD STAGE: 5.0 FT MINOR FLOOD STAGE: 5.5 FT
MODERATE FLOOD STAGE: 7.0 FT MODERATE FLOOD STAGE: 7.0 FT
MAJOR FLOOD STAGE: 8.0 FT MAJOR FLOOD STAGE: 8.0 FT
THE NATIONAL WEATHER SERVICE WELCOMES PUBLIC FEEDBACK. IF YOU HAVE
ANY QUESTIONS OR COMMENTS ON THIS CHANGE, PLEASE CONTACT:
ANDREW DIXON
SERVICE HYDROLOGIST
(616) 949-0643 EXT 493
ANDREW.DIXON@NOAA.GOV
NATIONAL WEATHER SERVICE
4899 TIM DOUGHERTY DRIVE SE
GRAND RAPIDS MI 49512
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