111
FXUS63 KGRR 290541
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
141 AM EDT Wed Jul 29 2026

.KEY MESSAGES...

- Next chance for rain Friday and Saturday

&&

.DISCUSSION...
Issued at 141 AM EDT Wed Jul 29 2026

Quiet weather through Thursday under high pressure with the next
chance for rain coming on Friday into the weekend. A shortwave
trough rounds the top of the western CONUS ridge and closes off
across or just south of the Great Lakes.

An associated surface low meandering across the Ohio Valley
brings a moist easterly flow into Lower Michigan where mid level
f-gen forcing and instability should bring rain and embedded
thunderstorms with some diurnal enhancement on Saturday. Afternoon
showers could linger into Sunday and even Monday before the upper
low gets kicked out.

&&

.AVIATION /06Z TAFS THROUGH 06Z THURSDAY/...
Issued at 141 AM EDT Wed Jul 29 2026

VFR conditions expected to continue through Wednesday evening.
North winds AOB 10 knots today, except for some gusts to near 20
knots possible at MKG this afternoon.

&&

.MARINE...
Issued at 129 AM EDT Wed Jul 29 2026

Winds and waves are diminishing and are or soon will be below 4
feet in all zones, so the SCA/BHS are expired. Waves could
increase to 3 to 4 feet again at South Haven on Wednesday
afternoon as north winds increase to near 20 knots.

Thursday to Saturday should see fairly light winds and waves with
north winds increasing again on Sunday to near 20 knots.

&&

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

&&

$$

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