294
FXUS63 KGRR 061832
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
232 PM EDT Sun Sep 6 2026

.KEY MESSAGES...

- Chances for Rain late Tuesday into Wednesday and again next
  weekend

&&

.DISCUSSION...
Issued at 232 PM EDT Sun Sep 6 2026

- Chances for Rain late Tuesday into Wednesday and again next
  weekend

Fair weather continues through Labor Day into most of Tuesday.
There could be some shallow fog late tonight into early Monday
morning as light winds and clear skies result in radiational
cooling. Lows will drop into the upper 40s and lower 50s by
daybreak across much of the forecast area.

An Omega block across the CONUS breaks down early this week as a
low across the Pacific NW kicks east and flattens the upper high,
with surface low pressure tracking across southern Canada. Return
flow of moisture and a surface cold front should kick off some
showers and thunderstorms late Tuesday into Wednesday. Shear
profiles suggest organized convection is possible if instability
is sufficient Tuesday evening ahead of the front.

A zonal flow pattern across the northern CONUS should allow a
quick progression of a shortwave trough from the Pacific NW into
the upper Great Lakes by next weekend with increasing chances for
showers and thunderstorms late Friday into Sunday.

&&

.AVIATION /18Z TAFS THROUGH 18Z MONDAY/...
Issued at 159 PM EDT Sun Sep 6 2026

Overall VFR conditions with an east to south east wind will
continue for the next 24 hours. The only caveat is JXN. Some low
CU from out east has brought MVFR over the site this afternoon.
That should linger through the day, clearing this evening.
 Clearing overnight, light winds and cool overnight lows should
allow for patchy fog/mist to develop at JXN. Expect MVFR to IFR
cigs and vsbys from 09Z until around 13Z. Conditions should then
improve to VFR by 15Z at the latest.

&&

.MARINE...
Issued at 232 PM EDT Sun Sep 6 2026

Light offshore winds, generally less than 15 knots, can be
expected through Labor Day under high pressure. Winds will
increase on Tuesday as the high moves east A Small Craft Advisory
will be needed for Tuesday afternoon through Wednesday night.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.

&&

$$

DISCUSSION...Ostuno
AVIATION...Ceru
MARINE...Ostuno