GRAND RAPIDS, Mich. (WOOD) - Rain could cause record crests in the Grand River in and around Grand Rapids by Sunday evening.
The Grand River could crest at record 22.4 feet in Grand Rapids, according to the National Weather Service. The current high-time record crest is 19.5 feet, which was set in 1985.
The Grand River at Comstock Park could hit 18.35 feet. The all-time record there is 17.8, set in 1948.
National Weather Service Hydrologist Mark Walton told 24 Hour News 8 that the predictions aren't set in stone -- they are still dependent upon how much rain the Grand Rapids area gets in the next two days. If that rain never materializes, river levels will not rise to the predicted levels.
He said that in the event the water does rise, downtown Grand Rapids is protected by flood walls so serious property damage is unlikely, but areas up and downstream are not.The most concern is for Comstock Park and Robinson Township. Walton advised preparing for flooding by moving valuables to upper floors of houses.
The crest of 22.4 feet would be high enough to impact the Grand Rapids waste water treatment plant.
It would be several feet higher than the level at which there would be moderate flooding of homes both up and downstream -- though not in the city proper -- and basement flooding in low-lying areas of the city.
It would also be about a half-foot below the water level at which there could be "major flooding of residential areas," according to the NWS.
An 18.35-foot crest would be high enough to cause major residential flooding in Comstock Park.
Homes along Abrigador Trail and Willow Drive had already seen moderate flooding as of Wednesday evening, when the river level was at 14.8 feet. Wednesday, the river in Grand Rapids was at 17.18 feet.
Flood warnings, watches and advisories are in effect for much of West Michigan as two to four inches of rain are expected Wednesday through Friday morning.
Storm Team 8 says significant flooding is a concern across the WOOD TV8 viewing area, especially near already-swollen rivers, creeks and streams, and low-lying areas.
With two to four more inches of rain by Friday, according the NWS, the threat is expected to be the most serious in the Grand River, Muskegon River, White River, Pere Marquette River, Pine River and Chippewa River.
The NWS Storm Prediction Center has included Central and Southern Lower Michigan in the moderate risk for severe storms -- which includes strong winds, hail and even the threat for tornadoes -- for Thursday.
==Watch the video above for Storm Team 8 coverage of the storms and flooding threat.==
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