218
FXUS63 KGRR 282331
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
731 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 calm 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 /00Z TAFS THROUGH 00Z WEDNESDAY/...
Issued at 731 PM EDT Mon Sep 28 2026
Winds go light and variable to calm overnight with clear skies
as high pressure moves over the region. This is another setup for
patchy or shallow fog between 08 and 13 Z, as predicted lows may
fall a few degrees below this afternoon`s crossover temperature.
Models indicate areas of fog, in some places becoming dense
(VLIFR), but do not give a strong signal which particular
locations are most favored for dense fog. VFR is then expected
with light south-southwest winds during the day 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