599
FXUS63 KGRR 221028
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
628 AM EDT Mon Jun 22 2026

.KEY MESSAGES...

- Cooler than normal this week with Rain on Wednesday

&&

.DISCUSSION...
Issued at 221 AM EDT Mon Jun 22 2026

- Cooler than normal this week with Rain on 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 while a shortwave trough brings the chance for rain
Wednesday into Wednesday night.

Moisture is limited on Wednesday with little return flow out
ahead of the low in a northwest flow regime and and precip amounts
will probably be less than a quarter inch.

&&

.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/...
Issued at 628 AM EDT Mon Jun 22 2026

Patchy IFR conditions will persist across southern Lower Michigan
into this morning then improve to MVFR as rain ends and clouds
break up, North winds will gust to 25 knots today.

&&

.MARINE...
Issued at 221 AM EDT Mon Jun 22 2026

Winds and waves will become hazardous to swimmers and small craft
this afternoon before decreasing late this evening. A Beach
Hazards Statement and Small Craft Advisory has been issued for
this afternoon and evening south of Pentwater.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...Beach Hazards Statement from 4 PM EDT this afternoon through
     this evening for MIZ043-050-056-064-071.
MARINE...Small Craft Advisory from 4 PM this afternoon to midnight EDT
     tonight for LMZ844>848.

&&

$$

DISCUSSION...Ostuno
AVIATION...Ostuno
MARINE...Ostuno