Portions of Lower Michigan saw flooding rainfall from Wednesday afternoon, April 17th, through the day on Thursday, April 18th. Most areas saw between 2 to 4 inches of rainfall. Some local areas near Holland and Grand Rapids saw around 5 inches of rainfall. All of this rainfall fell on top of already fully saturated soil from big rains that came in the last couple of weeks. This only exacerbated the already high river levels that were already in place
The high river levels combined with the heavy rainfall this week, is now leading to flooding on most area rivers. In fact, the flooding occurring is all-time record flooding at some locations since records have been kept.
Here is a link to the latest information on the area rivers. Southwest Michigan River Levels
Below is a map of the rainfall from Wednesday p.m. through Thursday night.
The next map is an image of rainfall over the past two weeks. You can see in the red shading that much of the area has seen between 6 and 10 inches of rain over the last 14 days.
The heavy rainfall came as numerous waves of low pressure moved across the area beginning Wednesday afternoon, and continuing through Thursday night. These waves contained showers and thunderstorms which contained heavy downpours. Below are loops of the radar through the period.
The first loop is from Wednesday afternoon and Wednesday evening.
The second loop is from overnight Wednesday night.
The final loop is during the daylight hours on Thursday.
Below are a couple of pictures of flooding in downtown Grand Rapids, courtesy of GRnow.