438
FXUS63 KGRR 291823
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
223 PM EDT Wed Jul 29 2026

.KEY MESSAGES...

- Dry Conditions Continue into Friday

- Rain Chances Increase Friday Night Into Saturday

&&

.DISCUSSION...
Issued at 223 PM EDT Wed Jul 29 2026

- Dry Conditions Continue into Friday

Upper level ridging will continue to build into the area into
Thursday. High pressure will be in place into Friday with dry
conditions expected and highs in the 80s with lows in the 50s to
low 60s. Expect cooler daytime temperatures along the lakeshore
with winds off of Lake Michigan.

- Rain Chances Increase Friday Night Into Saturday

A shortwave trough moves through Friday night into Saturday
bringing our next chance for rain. The surface low is expected to
track south of the area, but increasing precipitable water values
and mid level lift should support the development of rain showers
starting Friday night and continuing into Saturday. At this time
CAPE is limited, but can`t rule out some thunder during this
timeframe. Rain likely clears Saturday night, but some
variability in timing exists. If the trough lingers we could see
rain chances extend into Saturday night. After the trough clears
pressure heights increase and high pressure builds back into the
area.

&&

.AVIATION /18Z TAFS THROUGH 18Z THURSDAY/...
Issued at 135 PM EDT Wed Jul 29 2026

VFR weather will continue through the TAF period.

Scattered CU this afternoon will give way to clear skies after
00Z. Light northerly flow /around 10 kt/ this afternoon will
become light and variable this evening, as boundary layer cools
and surface ridge approaches from the west.

Surface ridge will be overhead Thursday. Light west-northwest
winds will develop by late morning. A few late morning CU may
form once again, though today`s sunshine will likely dry out
boundary layer further, so we may ultimately be CU-free.

&&

.MARINE...
Issued at 223 PM EDT Wed Jul 29 2026

High pressure will be in place into Friday. Northerly winds become
southwesterly Thursday into Friday around 5 to 15 knots. Rain
showers move in Friday night into Saturday with dry conditions
returning for Sunday. A few rumbles of thunder are possible. Wave
heights are expected to be 2 feet or less into Sunday with areas
toward the open waters potentially hitting 3 feet on Sunday.

&&

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

&&

$$

DISCUSSION...RAH
AVIATION...Smith
MARINE...RAH