742
FXUS63 KGRR 291741
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
141 PM 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 /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 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...Smith
MARINE...Ostuno
NWS GRR Office Area Forecast Discussion
