Portage, Michigan 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

450
FXUS63 KGRR 060547
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
147 AM EDT Mon Apr 6 2026

.KEY MESSAGES...

- Light mixed precipitation tonight/Monday

- Warmer, chance of rain late week

&&

.DISCUSSION...
Issued at 128 PM EDT Sun Apr 5 2026

- Light mixed precipitation tonight/Monday

Latest visible loop shows clearing skies over Wisconsin moving
east across the lake. We should see clearing at the lake shore by
late afternoon and that clearing will move east across the cwa by
late evening. It won`t last long, however. Another short wave see
in water vapor imagery over northern Minnesota will move
southeast across the cwa after midnight. We`re likely to see light
rain, possibly mixed with snow over the northern half of the cwa.
Precipitation will only be a few hundredths, which should do
little to exacerbate the ongoing flooding.

Another short wave Monday will follow, dragging a shot of cold air
with it. H8 temps are progd to fall to -15c by Tuesday morning.
That should be enough to generate some lake effect snow showers
over the region. However, boundary layer winds from the north are
not favorable for snow showers inland. It will be cold Tuesday;
highs from the upper 30s north to lower 40s south are expected.

- Warmer, chance of rain late week

The cold air doesn`t last long, though, this time of year. By
Wednesday, we`ll see highs in the upper 50s as high pressure moves
east and south winds on the back side of the high increase over
the region. The south winds will also draw moisture northward
where it will begin to interact with a cold front moving east
across the Plains. This cold front will be the focus of showers
Thursday through Saturday as it stalls over southern Lower. We`ll
see a couple of waves of low pressure ride northeast along the
frontal boundary. It`s possible that much of the thunderstorm
activity with stay south of the cwa, if the boundary sets up south
of I-94. However, when these frontal boundaries become quasi
stationary, they sometimes wiggle back and forth and that might be
enough to get the far southern cwa into the warm sector. We`ll
have to wait to see how this evolves before we can determine if
there`s a severe wx threat or whether additional rainfall will
slow the rate of river falls.

&&

.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/...
Issued at 146 AM EDT Mon Apr 6 2026

This forecast period starts out with all of the terminals sitting
at VFR with mainly mid and high clouds overhead. There is some
light rain being reported at times at KLDM with some spotty MVFR
ceilings. Some light rain will be more likely at KMKG and KGRR for
a couple of hours early this morning. Have gone VCSH at most of
the other sites.

Some MVFR clouds are likely to move in at KGRR and KMKG for a few
hours behind a weak front. These are likely only to persist for a
few hours before lifting to VFR. Another band of showers is
expected to move southward through the area mid-late afternoon.
These are likely to start out as some rain showers. Then they will
change to snow showers as a band moves through and colder air
moves in. More impacts are expected to affect KMKG and KGRR before
they weaken further south and east. Have gone tempo/prob30 for
this line to account for it.

Winds will then shift to become from the NNE. A few light
flurries/very light snow showers will be possible through 06z with
no impacts expected.



&&

.MARINE...
Issued at 128 PM EDT Sun Apr 5 2026

Small craft conditions are ongoing but will begin to diminish
later this afternoon as high pressure noses into the region. The
small craft advisory remains in effect until 8 pm.

Wind and waves will increase again Monday into Tuesday and another
small craft advisory may be needed.

&&

.HYDROLOGY...
Issued at 128 PM EDT Sun Apr 5 2026

Over a dozen river flood warnings are in effect for the next few
days as the crests on area rivers works downstream. Although light
rain is a possibility during the next couple of days, rain totals
will be less than a tenth of an inch and won`t significantly
impact the ongoing flooding. More rain later in the week may be a
bit heavier than what`s expected early this week, but will be
significantly less than the last few days.

Remember, never drive on a road that`s flooded, because the
pavement may be washed out beneath the flood waters.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory from 11 AM this morning to 8 AM EDT Tuesday
     for LMZ844>849.

&&

$$

DISCUSSION...04
AVIATION...NJJ
MARINE...04
HYDROLOGY...04