490
FXUS63 KGRR 281827
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
227 PM EDT Tue Apr 28 2026
.KEY MESSAGES...
- Cooler With A Couple Chances for Showers, Frost Likely
&&
.DISCUSSION...
Issued at 227 PM EDT Tue Apr 28 2026
- Cooler With A Couple Chances for Showers, Frost Likely
This week an upper level trough will sit over the region bringing
cooler temperatures along with a couple chances for showers.
A shortwave trough will move through late tonight into Wednesday
morning bringing scattered showers. Best chances (40 to 50
percent) will be south of a Holland to Mount Pleasant line. On the
backside of the trough showers could linger into the afternoon
with some surface based instability for more brief isolated
showers. Depths do not look high enough to pose any risk for
thunderstorms.
Another shortwave trough brings slight chances (20 percent) for
showers Thursday. Highs through the week will be in the 40s to 50s
with lows in the 20s to 30s with the coldest temperatures Friday
night into Saturday morning.
The colder temperatures will be a concern for sensitive
vegetation. At this time cloud cover is expected to be mostly
clear each night along with light winds due to the inversion.
Looking at 925mb temperatures and ensemble probabilities the
probability of lows less that 36 degrees is high starting
Wednesday night and going into the weekend. Ensembles are in
agreement as well for probabilities of less than 32 increasing
into the weekend. Lakeshore areas may be several degrees warming
than inland. Frost Advisory and Freeze Warning headlines will
likely be needed.
&&
.AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 125 PM EDT Tue Apr 28 2026
Visible loop sows some clearing occuring from the west; we`ll see
cigs lift and scatter this afternoon. However, the clearing will
be short lived as another low will lift northeast toward the Great
Lakes overnight. Clouds will move in after midnight and lower to
MVFR around 12z. Models indicate most if not all of the
precipitation will remain south of the terminals.
&&
.MARINE...
Issued at 227 PM EDT Tue Apr 28 2026
Winds and waves will drop below Small Craft Advisory conditions
this afternoon into this evening. Lighter winds and lower wave
heights are expected through the remainder of the week. Winds
shift to the north tonight into Wednesday and remain northerly
into Saturday.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory until 6 PM EDT this evening for LMZ844>849.
&&
$$
DISCUSSION...RAH
AVIATION...04
MARINE...RAH
NWS GRR Office Area Forecast Discussion
