553
FXUS63 KGRR 021723
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
123 PM EDT Fri Oct 2 2026
.KEY MESSAGES...
- Clearing And Frost Tonight
- Light Chance of Rain Sunday Morning, Then Frost/Freeze Possible
&&
.DISCUSSION...
Issued at 122 PM EDT Fri Oct 2 2026
- Clearing And Frost Tonight
Post frontal dir air and associated high pressure has led to mainly
some diurnal stratocu, which will diminish tonight leading to clear
skies. This will cause temps to fall as radiational cooling takes
hold into the 30s across much of the area. Frost advisory looks good
across the interior counties of Central Lower Michigan.
Probabilistic guidance suggests chances are low for temps to fall
below freezing, but would not be surprised so see some of our cold
hollows like Leota get that cold overnight.
- Light Chance of Rain Sunday Morning, Then Frost/Freeze Possible
A low chance of rain exists mainly north of M20 Sunday morning as a
mid-level wave and associated moisture provide a glancing blow to
our northern counties. A cold front crossing the area Sunday ends
the low rain chances and marks the arrival of a notably cooler
airmass. 850mb temps fall to near 0C across our interior north.
Given light winds/high pressure/clear skies a favorable setup for
frost, potentially freeze conditions, will be in place Sunday night
across our northern two rows and Monday Night areawide. Otherwise,
look for highs in the 60s and mild dewpoints making for comfortable
fall conditions.
&&
.AVIATION /18Z TAFS THROUGH 18Z SATURDAY/...
Issued at 117 PM EDT Fri Oct 2 2026
VFR conditions will prevail through Saturday morning. The
exception will be some thin stratocumulus bringing areas of MVFR
conditions this afternoon with bases 2000 to 3000 feet AGL and
tops AOB 3500 feet. North to northwest winds around 10 knots this
afternoon dropping to around 5 knots this evening.
&&
.MARINE...
Issued at 122 PM EDT Fri Oct 2 2026
Ongoing Small Craft Advisory expires this evening as winds diminish
with the approach of a high pressure system. Next window for
hazardous winds and waves looks to be Saturday Night into Sunday
ahead of a cold front, with the greatest risk north of Grand Haven
based on current guidance trends.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...Frost Advisory from 10 PM this evening to 8 AM EDT Saturday for
MIZ038>040-044-045.
MARINE...Small Craft Advisory until 8 PM EDT this evening for LMZ844>849.
&&
$$
DISCUSSION...Thomas
AVIATION...Ostuno
MARINE...Thomas
NWS GRR Office Area Forecast Discussion
