textproduct: Grand Rapids
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Rain Wednesday into Friday
- Cool air follows the rain
DISCUSSION
Issued at 252 PM EDT Tue Sep 29 2026
- Rain Wednesday into Friday
An upper low across the western CONUS will move east and pull moisture from an Eastern Pacific tropical cyclone with it, which spreads in a narrow ribbon along a nearly-east west frontal boundary by mid-week. We expect the rain to arrive Wednesday morning and continue on and off through Friday as the front moves slowly southeast, nearly parallel with the upper flow. Total QPF from this event is still expected to be 1 to 2 inches by the time it ends on Friday, but we will have to watch if it overperforms from the injection of tropical moisture.
- Cool air follows the rain
Upper troughing follows for the weekend into early next week with Canadian surface highs bringing the coolest air of the season so far. Temperatures are expected to fall below normal across the forecast area with frost and freezing temperatures widespread Saturday morning and again Tuesday morning as another Canadian surface high moves south early next.
AVIATION /00Z TAFS THROUGH 00Z THURSDAY/
Issued at 743 PM EDT Tue Sep 29 2026
VFR should continue well into tonight, with higher altitude ceilings trending MVFR from northwest to southeast during the daytime Wednesday. Not expecting fog tonight given the clouds and winds below 1,000 feet. The winds at 1,000 feet should be about 200 degrees at 20 to 25 knots, between 03 and 14 Z, which would lead to there being about 20 knots of LLWS below 1,000 feet. Light to occasionally moderate rain will spread over much of Lower Michigan on Wednesday, affecting northwest sooner southeast later. Ceilings may trend down to IFR near and north/northeast of MKG Wednesday afternoon.
MARINE
Issued at 252 PM EDT Tue Sep 29 2026
No changes to the headlines as winds pick up tonight ahead of the slow moving front and then ease as the pressure gradient slackens along the front on Thursday.
GRR WATCHES/WARNINGS/ADVISORIES
MI...Beach Hazards Statement through Thursday morning for MIZ037-043- 050. MARINE...Small Craft Advisory until 8 AM EDT Thursday for LMZ847>849.
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