textproduct: Grand Rapids

KEY MESSAGES

- Mostly Fair Weather through the Weekend

- Showers and Thunderstorms Possible Late Monday into Tuesday

DISCUSSION

Issued at 256 AM EDT Thu Sep 10 2026

- Mostly Fair Weather through the Weekend

High pressure moves in today with lower humidity. The drying persists into Saturday when the high moves east and return flow brings some moisture. There could be a few showers Saturday night into Sunday, but current dry forecast will not be changed until there is more ensemble support for deeper moisture.

- Showers and Thunderstorms Possible Late Monday into Tuesday

A shortwave trough ejects out of the northern Rockies with a surface low tracking into Canada early next week. A trailing cold front is expected to touch off showers and thunderstorms by late Monday into Tuesday. Instability and deeper moisture is across northern Lower Michigan pooling ahead of the cold front, which sinks south through the forecast area on Tuesday. Precipitable water surges over 2 inches, so heavy rain potential is there as the front will be moving slowly and MBE vectors are less than 10 knots.

The front clears the southern zones on Wednesday, but could return north again on Thursday as a surface low tracks across southern Lower Michigan.

AVIATION /12Z TAFS THROUGH 12Z FRIDAY/

Issued at 641 AM EDT Thu Sep 10 2026

Shallow fog will bring patchy IFR conditions through 12Z then the fog dissipates shortly after 12Z with VFR conditions today into tonight.

MARINE

Issued at 256 AM EDT Thu Sep 10 2026

Winds and waves should remain relatively light until Saturday when south winds increase and waves build over 4 feet. A Small Craft Advisory may be needed for Saturday.

GRR WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...None.