textproduct: Grand Rapids

KEY MESSAGES

- Showers continue until tomorrow

- Cooler weather ahead, Frost/freeze chances begin this weekend

DISCUSSION

Issued at 255 PM EDT Thu Oct 1 2026

- Showers continue until tomorrow

Light to moderate rain from the persistent tropical moisture will continue through the rest of the day until tomorrow as the ribbon of moisture continues. Anomalous PWATS upwards of 1.75 inches are on track to advect through the region through 00Z. So expect periods of moderate showers to be possible. However, the axis of heavier precip will slowly move to the southeast, so not expecting flooding. An additional inch of precipitation is expected, with the largest amounts expected along and south of the I -94 corridor.

- Cooler weather ahead, Frost/freeze chances begin this weekend

A cold front will be driving the moisture to the southeast tomorrow. Which will end the rainfall and usher in cooler temperatures, along with some gusty northwesterly flow tomorrow. This will bring cooler temperatures overall. Clear skies and lighter winds will set the stage for potential frost/freeze Friday night, Saturday morning. Min Temps could be 5 to 10 degrees below normal, especially north of I 96. Will hold off on headlines for now but they will probably be needed. Temps will rebound into Sunday, and a weak system will swing through, though any precipitation should be remain through northern lower. Temperaturesat or below normal are ahead, with High's in the low 60s expected through mid next week.

AVIATION /18Z TAFS THROUGH 18Z FRIDAY/

Issued at 728 PM EDT Thu Oct 1 2026

MVFR and areas of IFR conditions can be expected through this evening as a cold front slowly moves southeast across Lower Michigan. Conditions will improve overnight as the rain and low clouds move off to the southeast and VFR can be expected for Friday. Winds will go from southwest to northwest as the front moves through, generally less than 10 knots. Northwest winds on Friday could gust to 20 knots at times.

MARINE

Issued at 230 PM EDT Thu Oct 1 2026

Showers with fairly weak flow will continue tonight into Friday morning. A cold front will swing through the region tomorrow. While the winds will begin the morning out of the north, northeast, they will shift to have a more northwesterly flow. This increasing northwesterly flow will allow winds over the Lake to reach upwards of 25 to 30 knots and waves to build by Friday afternoon. So SCY conditions will begin in the north and build southward to envelop the lakefront. So have issued an SCY from 12Z Friday until 00Z Saturday. After which the winds and waves will subside.

GRR WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...Small Craft Advisory from 8 AM to 8 PM EDT Friday for LMZ844>849.