431
FXUS63 KGRR 102320
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
720 PM EDT Sat Oct 10 2026
.KEY MESSAGES...
- Rain Mid-Week then Cooler
&&
.DISCUSSION...
Issued at 232 PM EDT Sat Oct 10 2026
- Rain Mid-Week then Cooler
Tropical moisture will graze southeast Lower Michigan tonight
with low chance POPs there, then fair and warm weather expected
into Monday before a shortwave trough rides over the top of upper
ridging across the SE CONUS with a low pressure center tracking
across the central Great Lakes on Tuesday. This is followed by a
full latitude upper trough developing across the eastern CONUS by
next weekend and the potential for a stronger low on Wed-Thu
although ensemble spread remains considerable on the details.
At this point it seems possible rain will be around for Wednesday
and Thursday with sharply cooler weather for Friday and beyond.
&&
.AVIATION /00Z TAFS THROUGH 00Z MONDAY/...
Issued at 717 PM EDT Sat Oct 10 2026
High clouds cover the terminals from the tropical system to the
south. We`ll see increased low level moisture flow north overnight
and IFR ceilings are expected overnight. A LLJ moving to the north
will create some LLWS later this evening.
&&
.MARINE...
Issued at 232 PM EDT Sat Oct 10 2026
No changes to the Small Craft Advisory. Winds are still below 20
knots south of Pentwater but should be increasing this evening.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory until 5 AM EDT Sunday for LMZ846>849.
&&
$$
DISCUSSION...Ostuno
AVIATION...04
MARINE...Ostuno
NWS GRR Office Area Forecast Discussion
