Hudsonville, Michigan Weather Forecast Discussion

513
FXUS63 KGRR 170729
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
329 AM EDT Wed Sep 17 2025
.KEY MESSAGES...
- Fog This Morning, Few Showers Thursday
- Chance For Showers And Storms This Weekend Into Next Week
&&
.DISCUSSION...
Issued at 328 AM EDT Wed Sep 17 2025
- Fog This Morning, Few Showers Thursday
Expect areas of lower visibility this morning for areas mainly
along and east of US-131. Visibilities may drop down to a mile
with the best chance for any denser fog along US-127. Fog should
clear shortly after sunrise, with light winds and sunny skies
expected for the remainder of the day.
A round of positive vorticiy advection and 700mb moisture
advection move in this evening as a shortwave trough passes to
the northeast. The increase in moisture may be enough for some
isolated showers to develop along a backdoor cold front moving
through from northeast to southwest Thursday morning and
afternoon. Therefore added 20 percent PoPs to the forecast in
coordination neighboring offices.
- Chance For Showers And Storms This Weekend Into Next Week
A series of troughs move through toward the second half of the
weekend into the first half of next week. The first shortwave
trough is on the weaker side, but with a little more moisture in
place along with some increase 850 mb flow and positive vorticity
advection the signal is there for isolated to scattered showers
and some thunderstorms (20 to 30 percent) as early as Saturday
night and continuing into the day Sunday. Chances (30 to 50
percent) continue Sunday night into Monday within the southwest
flow ahead of a deeper trough. Looking at cluster analysis the
evolution of this trough varies along with the timing. Some
guidance suggests a cut off low develops and lingers into
Wednesday while others show more of an open wave pattern. With
this uncertainty stuck with the NBM PoPs through Tuesday.
&&
.AVIATION /06Z TAFS THROUGH 06Z THURSDAY/...
Issued at 131 AM EDT Wed Sep 17 2025
Not much of a change with the previous forecast. Light and
variable winds are expected through most of the day with a light
lake breeze developing this afternoon. Light to moderate fog with
visibilities dropping into the 1-5 SM range between 10Z-13Z is
expected this morning mainly along and east of a AZO to GRR to RQB
line. Lowest visibilities are expected toward LAN and JXN, but at
this time not expecting any dense fog.
&&
.MARINE...
Issued at 328 AM EDT Wed Sep 17 2025
Light and variable winds along with low wave heights continue.
Expect more onshore flow this afternoon as the lake breeze
develops. Winds build tomorrow behind the backdoor cold front with
northerly winds around 10 to 20 knots. Easterly winds then return
until more southwesterly flow develops Sunday and continues into
next week. With this change in the wind there will also be chances
for showers and even a few thunderstorms. At this time Small Craft
Advisory conditions are not expected over the next week.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...RAH
AVIATION...RAH
MARINE...RAH

NWS GRR Office Area Forecast Discussion