550
FXUS63 KGRR 090132
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
932 PM EDT Tue Oct 8 2024

.KEY MESSAGES...

- Frost Advisory Tonight...another possible Wednesday night

- Cooler With Increasing Weekend Showers

&&

.UPDATE...
Issued at 932 PM EDT Tue Oct 8 2024

Winds have diminished with the sfc high building in and skies are
clear, resulting in ideal radiational cooling conditions. Temps
may dip low enough to support some frost even south and west of
where the Frost Advisory is in effect so have added patchy frost
for the GRR and LAN/JXN areas as well.

&&

.DISCUSSION...
Issued at 320 PM EDT Tue Oct 8 2024

- Frost Advisory Tonight...another possible Wednesday night

We have issued a Frost Advisory tonight for a portion of our
forecast area. The northern row of counties has seen a killing
frost already, so we are issuing frost/freeze headlines south of
there. Tonight`s cold looks to focus north of Lansing through
Mount Pleasant and back to the west through Newaygo and Howard
City. Our southern and western areas towards I-94 and locations
near Lake Michigan will stay above Frost Advisory criteria. The
NPWGRR will be out shortly.

Another Frost Advisory for the bulk of the forecast area is likely
for Wednesday night as we look to be colder. We may even need a
Freeze Warning for places like Mecosta and Isabella Counties.

Otherwise, skies look to be mainly clear with quiet weather
tonight through Wednesday night.

- Cooler With Increasing Weekend Showers

High pressure holds over the region keeping conditions quiet and dry
through the end of the work week. A relatively dry cold front will
sweep through from north to south Friday evening bringing a chance
for scattered showers. Following the passage of that front, deep
upper troughing takes hold Saturday through the first half of next
week. An initial clipper system will bring renewed rain chances
Saturday night to Sunday, then persistent lake effect rain will be
possible into mid-week.

Upper troughing overhead will support cold air advection through mid-
week. Noticeably cooler temperatures in the 50s to 60s are expected
starting this weekend.

&&

.AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/...
Issued at 719 PM EDT Tue Oct 8 2024


VFR conditions will continue overnight and through tomorrow as
high pressure continues to dominate over the region. Winds will
diminish overnight and will be less than 10kts tomorrow.

&&

.MARINE...
Issued at 320 PM EDT Tue Oct 8 2024

High pressure over the Great Lakes region will keep winds light
and waves at a minimum from tonight into Thursday. The next time
frame when wind will be on the increase will be Thursday night
into Saturday morning. The strongest winds will be Friday (in
southwest winds ahead of a cold front) and Friday evening (in
north winds behind the cold front). Both periods of higher winds
will at least be Small Craft Advisory worthy if not Gale Force.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...Frost Advisory until 8 AM EDT Wednesday for MIZ044>046-051-052-
     058-059.
MARINE...None.

&&

$$

UPDATE...Meade
DISCUSSION...Duke/Thielke
AVIATION...Ceru
MARINE...Duke