378
FXUS63 KGRR 240604
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
204 AM EDT Fri Jul 24 2026
.KEY MESSAGES...
- Northwest Flow Regime Continues with Low Confidence for Rain
Chances
&&
.DISCUSSION...
Issued at 204 AM EDT Fri Jul 24 2026
- Northwest Flow Regime Continues with Low Confidence for Rain
Chances
A persistent western CONUS upper ridge and eastern CONUS upper
trough will keep the Great Lakes region in northwest flow with
occasional chances for rain/thunderstorms, but low confidence on
coverage and QPF amounts...and perhaps similar to the under-
performing events from the past week.
A weak shortwave trough moves through Saturday night. Not much
moisture available and the best lift is off to the east, so
low/slight chance POPs at best.
Another trough moving through late Monday into Tuesday has better
moisture to work with and is amplifying as it moves though, so
high chance to likely POPs in NBM appear possible if not
reminiscent of the convectively-lacking event of last Monday.
The longwave upper trough amplifies late in the week with a cold
front bringing another chance of rain on Friday followed by
another cool down for next weekend.
&&
.AVIATION /06Z TAFS THROUGH 06Z SATURDAY/...
Issued at 204 AM EDT Fri Jul 24 2026
VFR conditions will continue through Friday. Winds will be light
and variable.
&&
.MARINE...
Issued at 204 AM EDT Fri Jul 24 2026
Calm conditions today then a SCA may be needed for Saturday and
Saturday night and again Monday and Tuesday as a couple low
pressure centers quickly move through with southwest flow on
Saturday and Monday and northerly flow on Tuesday.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...Ostuno
AVIATION...Ostuno
MARINE...Ostuno
NWS GRR Office Area Forecast Discussion
