365
FXUS63 KGRR 280634
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
234 AM EDT Mon Sep 28 2026
.KEY MESSAGES...
- Dry through Tuesday
- Showers and isolated thunder Tuesday night - Friday
- Mild through Thursday, then cooler
&&
.DISCUSSION...
Issued at 234 AM EDT Mon Sep 28 2026
- Dry through Tuesday
We`re looking at some patchy dense fog again early this morning.
Hart, Fremont, and Ludington are at or near a quarter mile and a
couple other locations around a half mile. Any fog that does
develop will burn off by mid morning.
High pressure remains entrenched across the Great Lakes extending
west to the upper MS Valley and being held in place by the Mid
Atlantic low. A light north wind will keep dewpoints comfortably
in the 50s through Tuesday and we`ll see quite a bit of sunshine;
IR loop shows scattered high clouds to the east and west.
Once the low begins to move northeast today, the high will also
drift east and we should develop a south flow by Tuesday. Tuesday
will be another sunny day, but may see some high clouds begin to
move in from the west later in the day.
- Showers and isolated thunder Tuesday night - Friday
The blocking low off the East Coast has delayed the arrival of the
next cold front until Wednesday. The GFS and ECMWF are in pretty
good agreement in showing showers/storms along the cold frontal
boundary, extending to the low in western Kansas. Instability is
very weak with positive LI`s and MUCAPE a couple hundred j/kg at
best Wednesday into Thursday. That said, most ECMWF ensemble
members produce rain during this time frame with the average
around a half inch.
The cold front will move south across the cwa Friday and take the
precipitation with it. High pressure quickly builds in behind it
for Saturday and much of Sunday.
- Mild through Thursday, then cooler
Average highs around around 70 currently and we`ll be in the mid
70s through Thursday before cooling into the mid 60s Friday,
behind the cold front as h8 temps fall to around 5c from 18c
Thursday.
&&
.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/...
Issued at 234 AM EDT Mon Sep 28 2026
Skies are clear across the region. However, some fog and vertical
restrictions have developed to the north and east of the
terminals. Models indicate JXN has the highest probability of
seeing visibilities less than 2sm by 10z and included that in the
TAFs. Fog will dissipate later this morning leading to VFR
conditions through the day. A repeat of more fog is possible again
after 04z tonight.
&&
.MARINE...
Issued at 234 AM EDT Mon Sep 28 2026
Wind will be relatively light through Tuesday due to high pressure
overhead. After that, the high will drift east and south winds
will increase ahead of the next cold front. A small craft advisory
may be needed Wednesday north of Grand Haven.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...04
AVIATION...04
MARINE...04
NWS GRR Office Area Forecast Discussion
