568
FXUS63 KGRR 101041
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
641 AM EDT Thu Sep 10 2026
.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.
&&
$$
DISCUSSION...Ostuno
AVIATION...Ostuno
MARINE...Ostuno
NWS GRR Office Area Forecast Discussion
