674
FXUS63 KGRR 042331
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
731 PM EDT Sun Oct 4 2026
.KEY MESSAGES...
- Dry weather expected for much of this week
- Limited chance of frost Tonight...Better chance Monday Night
&&
.DISCUSSION...
Issued at 252 PM EDT Sun Oct 4 2026
- Dry weather expected for much of this week
Strong high pressure building in will bring dry weather through
much of the week. Northwesterly flow aloft Tuesday through late
this week brings with it some chance for very light rain...though
not much in the way of moisture will be available for producing
anything too heavy or to widespread. Best chance for that should
be north of the forecast area.
- Limited chance of frost Tonight...Better chance Monday Night
Non-zero chance for pockets of frost tonight in our far northern
zones but lower levels should remained mixed enough tonight to
keep the temperatures up. There is a better chance for frost
Monday night into early Tuesday with less wind and clouds.
&&
.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 731 PM EDT Sun Oct 4 2026
Little in the way of aviation concerns tonight and Monday. The
MVFR ceilings that were in place across portions of Western Lower
Michigan have scattered out and dissipated. The TAF period should
either see clear skies or SCT-BKN bases at or near 6,000ft. A
patch of moisture over Northern Wisconsin will move southeast
tonight and potentially affect the TAF sites with VFR bases. It is
most likely that these clouds work through between 05z and 12z.
Winds are in the process of decoupling as we move towards 00z. We
are already losing the gustiness at most locations. Tonight a west
to northwest wind of 4-8 knots will be common. Northwest winds on
Monday will run in the 5-10 knot range.
&&
.MARINE...
Issued at 252 PM EDT Sun Oct 4 2026
Northwesterly winds to keep waves up through the overnight hours
into early Monday. Have extended the existing small craft advisory
and added the southern zones where waves will increase this
evening. Could see waves linger into mid-late Monday morning for
some...though winds quiet down and most of the day should see
smaller waves. Tuesday could be another small craft day with
breezy conditions expected in the afternoon/evening.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory until 8 AM EDT Monday for LMZ844>849.
&&
$$
DISCUSSION...Maczko
AVIATION...Duke
MARINE...Maczko
NWS GRR Office Area Forecast Discussion
