118
FXUS63 KGRR 080658
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
258 AM EDT Fri May 8 2026
.KEY MESSAGES...
- Northwest Flow Regime Continues
&&
.DISCUSSION...
Issued at 257 AM EDT Fri May 8 2026
- Northwest Flow Regime Continues
Upper troughing across the Great Lakes will persist into next
week. Temperatures will run cooler than normal with Frost/Freeze
potential or Saturday, Sunday and Monday nights. Clipper type lows
will occasionally bring showers in a northwest flow regime.
A shortwave trough moves through tonight with scattered showers
into Saturday morning. The pattern repeats for Tuesday into
Tuesday night. The Tuesday low should have deeper moisture to
work with, but is moving fast enough to limit the chances of
excessive rainfall.
&&
.AVIATION /06Z TAFS THROUGH 06Z SATURDAY/...
Issued at 141 AM EDT Fri May 8 2026
VFR conditions continue through Friday night. There could be some
shallow ground fog at JXN and AZO between 10 and 12Z if skies are
clear and radiational cooling conditions are optimal. This was
left out of the forecast because of uncertainty of cloud cover
overnight. Winds will be near clam overnight then southwest AOB 10
knots on Friday. There could be some gusts over 20 knots at times
this afternoon.
&&
.MARINE...
Issued at 257 AM EDT Fri May 8 2026
Held off on a SCA for tonight as conditions will be marginal but
it is possible that south/southwest winds will gust to 25 knots
this evening north of Whitehall where waves could also top 4 feet,
especially around Big and Little Sable Points.Conditions improve
Saturday night and Sunday as pressure gradient relaxes.
&&
.FIRE WEATHER...
Issued at 257 AM EDT Fri May 8 2026
Lowered NBM dew points for today given soundings showing mixing
heights rising to 7500 feet. This yields Min RH to around 25
percent this afternoon. Deep mixing will yield winds of 20 knots
at the surface as well, so we will have to monitor for RFW
criteria being reached this afternoon,
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...Frost Advisory until 9 AM EDT this morning for MIZ037-038-
043>046.
Freeze Warning until 9 AM EDT this morning for MIZ039-040.
MARINE...None.
&&
$$
DISCUSSION...Ostuno
AVIATION...
MARINE...Ostuno
FIRE WEATHER...Ostuno
NWS GRR Office Area Forecast Discussion
