585
FXUS63 KGRR 212325
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
725 PM EDT Sun Jun 21 2026
.KEY MESSAGES...
- Rain chances this afternoon and overnight
- Cooler than normal temperatures persist through the week
&&
.DISCUSSION...
Issued at 208 PM EDT Sun Jun 21 2026
- Rain chances this afternoon and overnight
Beneficial light rain for some with no significant impacts
expected this afternoon and overnight. Focus for rain is near and
south of I-96 with better chances for more rain the further south
you go.
Current ensemble probabilities for near I-94 show around 75% chance
for one-quarter inch or more, 50% chance for one-half inch or more
of rain by tomorrow and around a 10% chance of one inch or more. Up
around I-96 those probabilities drop to around 35% chance for one-
quarter inch or more, around 15% chance for one-half inch or more
and near zero percent chance of one inch or more. Up around US-10,
the probabilities for one-tenth of an inch or more and one-
quarter inch or more are both near 0%.
So most likely case is around a quarter-inch or less near I-96 and a
half-inch or so near/south of I-94. Again...no significant impacts
expected from this rain.
Some lightning may be possible...though chances for that should be
better closer to and south of the Indiana border than up in lower
Michigan.
- Cooler than normal temperatures persist through the week
No change to the overall pattern expected this week with
temperatures generally hovering in the mid 70s for highs and in the
50s for lows. We could see some warming to more summer like
temperatures next weekend into the last few days of June with models
indicating warming temps potentially through the 4th of July
weekend.
&&
.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 722 PM EDT Sun Jun 21 2026
Light rain continues to fall at the I-94 terminals and is very
slowly moving north and will likely reach the northern terminals
later this evening. Expect several hours of IFR cigs overnight
except at MKG/GRR where MVFR will be the most likely category. A
return to VFR Monday afternoon is expected.
&&
.MARINE...
Issued at 208 PM EDT Sun Jun 21 2026
Winds and waves begin to increase midday Monday and continue
through Monday evening. Small craft and beach hazards statement
may be needed for some if not all of the coastal zones tomorrow.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...Maczko
AVIATION...04
MARINE...Maczko
NWS GRR Office Area Forecast Discussion
