textproduct: Grand Rapids

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 /18Z TAFS THROUGH 18Z SATURDAY/

Issued at 138 PM EDT Fri Jul 24 2026

VFR conditions will continue to dominate through the forecast period. Winds are expected to go light/variable between 00Z to 01Z this evening. Winds will mix out of the southwest between 13Z to 17Z west to east Saturday morning.

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.