Muir, Michigan Weather Forecast Discussion

280
FXUS63 KGRR 290729
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
329 AM EDT Mon Sep 29 2025
.KEY MESSAGES...
- Warm and dry conditions will continue this week
&&
.DISCUSSION...
Issued at 320 AM EDT Mon Sep 29 2025
- Warm and dry conditions will continue this week
Shallow Patchy fog will again greet portions of southwest and
central Michigan this morning. The cool overnight lows, coupled
with calm winds will allow for another, albeit weaker, round of
shallow fog. Any fog that forms will lift/dissipate shortly
after sunrise.
Forecast and models remain fairly unchanged. The large upper
ridge will dominate the pattern through the week. Temperatures
will continue their trend into the 80s today and tomorrow. Tuesday
will see a back door cool front swing through the which will
shift the high pressure to the west slightly and bring cooler air,
dropping temperatures back into the 70s Tuesday and Wednesday.
That will be short lived as that front moves east and the high
settles again over the upper midwest. Temps should then climb back
into the 80s through the end of the week and into the weekend.
The ridge should flatten into the weekend.
Next chance for precipitation is potentially next week. However
given model variability timing remains uncertain.
&&
.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/...
Issued at 128 AM EDT Mon Sep 29 2025
Weak northwesterly flow along with weak southeasterly surface
winds should allow for a moisture boundary. That boundary, along
with clear skies and calming winds overnight should allow for
MVFR cigs and vsbys overnight, especially at southern TAF sites
with a brief period in GRR. So have continued and expanded MVFR
cigs and vsbys. Any reducing cigs and vsbys should lift/dissipate
shortly after sunrise. VFR conditions should then dominate the
forecast period.
&&
.MARINE...
Issued at 305 AM EDT Mon Sep 29 2025
Light winds and waves will persist through Tuesday. Wind direction
will tend to vary with the contribution of the daytime lake
breeze circulation and the nighttime land breeze circulation.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...Ceru
AVIATION...Ceru
MARINE...Ceru

NWS GRR Office Area Forecast Discussion