846
FXUS63 KGRR 191043
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
643 AM EDT Fri Jun 19 2026
.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 /12Z TAFS THROUGH 12Z SATURDAY/...
Issued at 643 AM EDT Fri Jun 19 2026
VFR conditions will continue through Saturday morning. Northwest
winds could gust to over 20 knots at times this afternoon, then
diminish 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.
&&
$$
DISCUSSION...Ostuno
AVIATION...Ostuno
MARINE...Ostuno
NWS GRR Office Area Forecast Discussion
