textproduct: Grand Rapids

KEY MESSAGES

- Cooler than normal with occasional rain

DISCUSSION

Issued at 235 AM EDT Fri Jun 19 2026

The Great Lakes will continue to be in a fast quasi-zonal flow regime on the southern edge of persistent upper troughing across eastern Canada into next week. This will keep temperatures below normal with fast-moving shortwave troughs bringing the chance for rain late tonight into early Saturday, Sunday night, and again on Wednesday.

The best chance for rain will be across southern Lower Michigan on Sunday night as low pressure tracks across northern Indiana and Ohio. An area of mid-level frontogenetic forcing should bring steady rain across the I-94 corridor with QPF of one-half to one inch by the time the rain ends on Monday.

A weaker low follows for Wednesday in northwest flow and precip amounts will probably be less than a quarter inch.

AVIATION /18Z TAFS THROUGH 18Z SATURDAY/

Issued at 114 PM EDT Fri Jun 19 2026

SCT to BKN diurnal Cu are expected to continue through this evening around 5kft inland of the lake shadow (meaning cloud cover will be little at MKG through the afternoon). Tonight, widespread clouds move in ahead of a cold front along with scattered showers that have a low chance of affecting the terminals, with a PROB30 at GRR/MKG where the chance is best. MVFR cigs have a moderate (50-60%) chance of development based on RRFS/other model soundings, highest at GRR. Any low ceilings should dissipate by mid morning given strong June sunshine. Gusts to around 20 knots expected through the afternoon before diminishing this evening.

MARINE

Issued at 643 AM EDT Fri Jun 19 2026

Fairly tranquil conditions into Sunday then winds and waves will increase Sunday night as low pressure passes just south of Lake Michigan. A SCA may be needed for Monday.

GRR WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...None.