402
FXUS63 KGRR 281821
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
221 PM EDT Mon Sep 28 2026
.KEY MESSAGES...
- More patchy areas of dense fog tonight
- Rain Wednesday through Friday
&&
.DISCUSSION...
Issued at 221 PM EDT Mon Sep 28 2026
- More patchy areas of dense fog tonight
High pressure remains over the Great Lakes tonight with clam winds
and clear skies which means another night of good radiational
cooling conditions. Similar to the past few nights, patch dense
fog will form in low spots, especially near rivers and inland
lakes where air temperatures cool below the still relatively warm
water temperatures resulting in shallow, but dense "steam fog".
- Rain Wednesday through Friday
An upper low across the western CONUS will move east and pull
moisture from the Eastern Pacific tropical cyclone with it, which
spreads in a narrow ribbon along a nearly-east west frontal
boundary by mid-week. We expect the rain to arrive by Wednesday
afternoon and continue through Friday as the front moves slowly
southeast, nearly parallel with the upper flow, with occasional
breaks in the steady rain. Total QPF from this event is expected
to be 1 to 2 inches by Friday, but we will have to watch if it
overperforms from the injection of tropical moisture.
&&
.AVIATION /18Z TAFS THROUGH 18Z TUESDAY/...
Issued at 203 PM EDT Mon Sep 28 2026
A few cumulus clouds around 4,000 feet have developed this
afternoon and will dissipate around sunset. Light and variable
winds overnight with clear skies are expected as high pressure
moves over the region. This is another setup for patchy or shallow
fog between 08 and 13 Z. VFR is then expected with south-southwest
winds on Tuesday.
&&
.MARINE...
Issued at 203 PM EDT Mon Sep 28 2026
10 knot northwest winds Monday afternoon will diminish with a
weak land breeze developing overnight. Waves build to 1-3 feet
north of Grand Haven on Tuesday with south winds. South-southwest
winds strengthen on Wednesday, which favors small craft advisory
and hazardous beach conditions north of Holland. Hazardous
conditions are likely to continue into Thursday
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...Ostuno
AVIATION...CAS
MARINE...CAS
NWS GRR Office Area Forecast Discussion
