475
FXUS63 KGRR 170657
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
257 AM EDT Sat Oct 17 2026
.KEY MESSAGES...
- Blocking Pattern Brings Fair Weather
&&
.DISCUSSION...
Issued at 256 AM EDT Sat Oct 17 2026
- Blocking Pattern Brings Fair Weather
THe sharp upper trough that brought the cold air and lake effect
showers moves east over the weekend with rising heights and
southwest flow bringing warmer temperatures. However, the current
cold airmass will still be in place for tonight and another round
of frost/freeze conditions can be expected away from Lake Michigan
where winds can decouple. The growing season will be ended on
Sunday, since we are past the climatological end of the season and
the two nights of cold temperatures.
No precipitation is expected for the next week under upper
ridging. Height falls may finally happen next weekend as a
shortwave trough moves across southern Canada and approaches the
Great Lakes.
&&
.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
Issued at 150 AM EDT Sat Oct 17 2026
VFR conditions through Saturday evening. North winds are
decreasing but some gusts near 20 knots are still possible
through 08Z then diminish to less than 10 knots by 10Z. Winds
will increase this afternoon from the southwest with some gusts
to 20 knots at MKG by late afternoon.
&&
.MARINE...
Issued at 256 AM EDT Sat Oct 17 2026
The Gale Warning expired at 2 AM and was followed with a Small
Craft Advisory until 10 AM. The day shift will have to hoist
another SCA or even a Gale Warning for later today and beyond as
southwest winds increase and waves build.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...Freeze Warning until 8 AM EDT this morning for MIZ043>046-
050>052-056>059.
Frost Advisory until 8 AM EDT this morning for MIZ064>067-
071>074.
MARINE...Small Craft Advisory until 10 AM EDT this morning for LMZ844>849.
&&
$$
DISCUSSION...Ostuno
AVIATION...Ostuno
MARINE...Ostuno
NWS GRR Office Area Forecast Discussion
