Wyoming, Michigan 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

168
FXUS63 KGRR 131141
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
741 AM EDT Wed Aug 13 2025

.KEY MESSAGES...

- A Little Cooler and Drier Next Couple Days

- Hot This Weekend With Showers/Storms Possible

&&

.DISCUSSION...
Issued at 348 AM EDT Wed Aug 13 2025

- A Little Cooler and Drier Next Couple Days

Areas of fog and low stratus will lift and scatter out later this
morning. Dew points will drop today as drier air mixes down,
reaching the 50s in central Mich and mid 60s in southern Mich.
Temperatures will be near mid-August normals through Thu night.
Only spoiler may be some moderate AQI smoke infiltrating into
portions of Lower Michigan per upstream air quality monitors and
the (experimental) HRRR-Smoke.

- Hot This Weekend With Showers/Storms Possible

Large scale ridging will build over the central CONUS late in the
week, and 850 mb temperatures nearing 20 C return on Saturday. Dew
points are also expected to climb and the heat index should be
well into the 90s on Sat. Michigan will tend to be just downstream
of the 500 mb ridge with some ridge-riding shortwaves supporting a
round or two of scattered thunderstorms. Storm chances are
relatively higher up north on Saturday and may affect our part of
Michigan later Saturday into early Sunday.

Ensembles are split whether the cold front sags south enough to
provide a cooler and drier Mon-Tue, or if there will be another
surge of humid and unstable air with additional storm and heavy
rain chances during that time.

&&

.AVIATION /12Z TAFS THROUGH 12Z THURSDAY/...
Issued at 741 AM EDT Wed Aug 13 2025

IFR visibility and ceilings will trend MVFR after 13 Z, then
likely be VFR by mid-day, 16 Z, as the lower atmosphere mixes
drier air down with daytime heating. Afternoon scattered cumulus
are expected above 4,000 feet with light winds from the northwest.

&&

.MARINE...
Issued at 348 AM EDT Wed Aug 13 2025

Light north winds are expected to strengthen out of the northwest
to around 15-20 knots this afternoon, per high resolution models
which better capture the effects of high pressure nosing in paired
with the developing lake breeze. Generally 2 to 3 ft waves today,
with 3 to 4 ft waves and moderate swim risk later this afternoon
between Whitehall and South Haven.

The weekend into early next week will feature chances for
thunderstorms to occasionally cross Lake Michigan.

&&

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

&&

$$

DISCUSSION...CAS
AVIATION...CAS
MARINE...CAS