676
FXUS63 KGRR 071706
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
Issued by National Weather Service Detroit/Pontiac MI
106 PM EDT Thu May 7 2026
.KEY MESSAGES...
- Cool with occasional chances for showers
&&
.DISCUSSION...
Issued at 234 AM EDT Thu May 7 2026
- Cool with occasional chances for showers
Upper troughing across the Great Lakes will persist into next
week. Temperatures will remain cool with a frost threat again
Thursday night. Frost/Freeze potential increases for Saturday,
Sunday and Monday nights as well. Clipper type lows will
occasionally bring showers in a northwest flow regime.
A shortwave trough moves through today and tonight with the
diurnal increase in sfc-based instability this afternoon and
evening resulting in isolated to scattered showers. The pattern
repeats for Saturday and Tuesday. The Tuesday low should have
deeper moisture to work with, but is moving fast enough to limit
the chances of excessive rainfall.
&&
.AVIATION /18Z TAFS THROUGH 18Z FRIDAY/...
Issued at 106 PM EDT Thu May 7 2026
Diurnal cumulus field is gradually increasing in coverage outside
the Lake Michigan shaddow. Additional clouds with a few showers is
working across northern Illinois. Clouds and showers are expected
to increase in coverage through the afternoon and will traverse
the airspace of the southern terminals early this evening.
Ceilings will remain VFR with this weak system. The somewhat
gusty west flow this afternoon will quell quickly this evening and
become light and variable overnight. Patchy ground fog may affect
a few inland terminals with a little bit more near surface
moisutre in place tonight. High clouds with light westerly winds
are expected on Friday.
&&
.MARINE...
Issued at 234 AM EDT Thu May 7 2026
West winds today could gust over 20 knots at times, otherwise
winds and waves will remain relatively light into the weekend.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...Ostuno
AVIATION...Mann
MARINE...Ostuno
NWS GRR Office Area Forecast Discussion