textproduct: Grand Rapids

KEY MESSAGES

- Rain and Thunderstorms Monday Afternoon into Monday Night

- Cooler and Mainly Dry Tuesday through Saturday

DISCUSSION

Issued at 235 PM EDT Sun Apr 26 2026

- Rain and Thunderstorms Monday Afternoon into Monday Night

Overall dry conditions are expected into early Monday afternoon. A decaying line of thunderstorms moves in from the southwest during the late afternoon. Instability and lift will be limited over the area. This initial round of rain ahead of our evening round could impact our marginal severe risk. We'll have plenty of shear with the low and mid level jet, but instability is lacking. HREF keeps values below 1000 J/kg and doesn't bring in the better instability until the line of showers and thunderstorms is already through the area. This timing difference really limits the potential for any stronger storms. The best window for any strong to severe storms would be between 8pm Monday and 2am Tuesday. Wind would be the primary concern largely south of I-96 with the best chances in far southwest Michigan. This area is consistent between the NCAR, GEFS, NSSL, Nadocast, and SPC outlooks.

- Cooler and Mainly Dry Tuesday through Saturday

We'll remain under troughing through most of the week bringing cooler temperatures to the region. A couple shortwave troughs may spark off showers Tuesday night into Wednesday and Thursday night into Friday. High temperatures will largely be in the 50s with lows in the 30s. Frost will be possible starting Wednesday night. Be prepared to take care of any sensitive vegetation during this period of colder temperatures.

AVIATION /18Z TAFS THROUGH 18Z MONDAY/

Issued at 113 PM EDT Sun Apr 26 2026

VFR conditions are expected through the TAF period as earlier low clouds have burned off. High pressure and a lack of low-level moisture will limit cloud cover to mid and high clouds over the next 24 hours. Winds will be from the southeast through the TAF period, with gusts to 25 knots expected starting mid to late Monday morning.

MARINE

Issued at 235 PM EDT Sun Apr 26 2026

Southeast winds build tonight into Monday with gusts 25 to 30 knots Monday morning. Small craft advisory conditions are then expected to continue into Tuesday with winds becoming more westerly. Wave heights build to 4 to 8 feet Monday night as the winds shift to the southwest. Thunderstorms will also be possible late Monday afternoon into Monday night.

Winds and waves will then subside Tuesday afternoon and remain below Small Craft Advisory conditions through the rest of the week.

GRR WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...Small Craft Advisory from 8 AM Monday to 6 PM EDT Tuesday for LMZ844>849.