Mattawan, Michigan Weather Forecast Discussion

591
FXUS63 KGRR 100531
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
131 AM EDT Wed Sep 10 2025
.KEY MESSAGES...
- Dry and Warm through Friday
- Slight Chances for Rain Saturday
&&
.DISCUSSION...
Issued at 331 PM EDT Tue Sep 9 2025
- Dry and Warm through Friday
Overall dry conditions with highs in the upper 70s to low 80s and
lows in the 40s to low 50s are expected through Friday. A weak
front will move through Wednesday bringing with in increased cloud
cover but dry air at the surface along with the weak forcing will
prevent any precipitation from making it to the surface. Light
southerly winds will shift to the east and northeast Thursday
behind the front and be more variable on Friday.
- Slight Chances for Rain Saturday
Saturday we`ll be in between a ridge to the west and a trough to
the northeast. The strength of either of these features will
determine our rain chances over the weekend. Overall focus is more
on Saturday for rain chances with solutions focusing on the
morning or overnight period into early Sunday morning. Guidance is
also hinting at some instability so can`t rule out a few rumbles
of thunder. Overall the probability is low at this time for
showers and thunderstorms with the probability of a hundredth or
more of rain in the 20 to 30 percent range across the area.
Afterwards the dry weather continues through the remainder of the
weekend with highs remaining in the upper 70s to low 80s and lows
in the 50s.
&&
.AVIATION /06Z TAFS THROUGH 06Z THURSDAY/...
Issued at 131 AM EDT Wed Sep 10 2025
Another set of forecasts with minimal concerns/impacts through the
period. We are looking at thin high clouds over the area early
this morning, all very much VFR with ceilings around 25k ft. We
have added some fog again at KJXN as that has been the case with
light winds the last few mornings, and a similar setup today.
We will see clouds lower some, into the mid levels of the
atmosphere today. We do not expect anything below 10k ft. Winds
will pick up a bit by noon EDT/16z from the SW. These winds will
gradually turn to the NNE tonight as a weak front pushes through.
&&
.MARINE...
Issued at 331 PM EDT Tue Sep 9 2025
Mariners can expect quiet weather over the nearshore waters of
eastern Lake Michigan through Wednesday. South to southwesterly
breezes of generally 10-20 kts will diminish early this evening, and
then remain light southerly late tonight into Wednesday. A very weak
pressure gradient across the region Wednesday may allow onshore lake
breezes to develop by late afternoon, with winds and waves remaining
on the light side.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...RAH
AVIATION...NJJ
MARINE...NJJ/Smith

NWS GRR Office Area Forecast Discussion