textproduct: Grand Rapids

KEY MESSAGES

- Rain Chances Tonight and Wednesday

DISCUSSION

Issued at 155 AM EDT Sun Jun 21 2026

- Rain Chances Tonight and Wednesday

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

The best chance for rain tonight will be across southern Lower Michigan as low pressure tracks across northern Indiana and Ohio. An area of mid-level frontogenetic forcing brings steady rain across the I-94 corridor with QPF close to an inch by the time the rain ends on Monday. There will be a sharp gradient to the north with around a quarter inch along I-96 and less than a tenth of an inch north of there.

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

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

Issued at 653 AM EDT Sun Jun 21 2026

VFR conditions this morning will go over to MVFR this afternoon as rain moves in from the southwest then IFR this evening as steadier rain develops and ceilings lower. There will be a gradual improvement Monday morning as the rain ends.

MARINE

Issued at 156 AM EDT Sun Jun 21 2026

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

GRR WATCHES/WARNINGS/ADVISORIES

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