315
FXUS63 KGRR 041120
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
720 AM EDT Sat Oct 4 2025

.KEY MESSAGES...

- Late summer-like weather through Monday then showers and
  temperatures falling

&&

.DISCUSSION...
Issued at 200 AM EDT Sat Oct 4 2025

- Late summer-like weather through Monday then showers and
  temperatures falling

Upper ridging and southwest flow persists into Monday with 850 mb
temps around 15-16C and highs in the 80s. Low level moisture
return increases ahead of an advancing western CONUS trough and a
cold front is expected to focus showers and a few thunderstorms
Monday evening into Tuesday.

The front clears Lower Michigan Tuesday night with dry northerly
flow as high pressure builds in. There could be some frost by
Wednesday morning with a better chance for frost and freezing
conditions Thursday morning.

The sfc high moves east with return moisture and an upper low
bringing the chance of showers by the end of the week.

&&

.AVIATION /12Z TAFS THROUGH 12Z SUNDAY/...
Issued at 720 AM EDT Sat Oct 4 2025

VFR conditions expected through tonight. Winds will be south to
southwest today AOB 10 knots.

&&

.MARINE...
Issued at 200 AM EDT Sat Oct 4 2025

Surface pressure gradient will tighten over the next couple days
with increasing south to southwest winds. Conditions are expected
to become hazardous to small craft on Sunday north of Holland and
possibly south of there on Monday. A cold front moves through by
Tuesday with north winds possibly gusting over 25 knots at times
Tuesday afternoon and evening.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.

&&

$$

DISCUSSION...Ostuno
AVIATION...Ostuno
MARINE...Ostuno