East Lansing, Michigan 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

071
FXUS63 KGRR 150546
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
146 AM EDT Fri Aug 15 2025

.KEY MESSAGES...

- Hot and Humid weather returns

- Showers and Storms Possible this weekend

- More organized Storms possible early next week

&&

.DISCUSSION...
Issued at 325 PM EDT Thu Aug 14 2025

- Hot and Humid weather returns

 Latest satellite shows a good mix of sun and clouds as the
increased humidity due to the southerly flow is combining with
the increased heat to allow for scattered cumulus this afternoon.
While it should remain dry overall, there is a slight chance that
there could be a light shower this afternoon.

The hot and humid conveyor belt returns through the weekend.
Temperatures will continue to build into Saturday, bringing temps
back into the 90s by Saturday with dewpoints into the upper 60s to
low 70s. That will give SW Michigan hot and sticky weather
Saturday. This is due to zonal flow that will continue to dry
warm, moist air around high pressure that is situated over the
central US.

- Showers and Storms Possible this weekend

 Several boundaries and fronts will swing through the Great Lakes
as the upper level pattern over top the previously mention high.
Ensembles continue to have good agreement of strong moisture
transport Saturday into Sunday with anomalous PWATS late Saturday
into Sunday. NAEFS mean PWATS are +2 with 1.75 to 2 inches of
moisture that will straddle Lower Michigan. So given the advection
of this frontal boundary there is the potentially for heavy
downpours late Saturday into Sunday. As such portions of northern
lower north of Muskegon are in a marginal excessive rainfall out
look, with areas north of Ludington in a slight risk of excessive
rainfall. QPF continues to be increased with a half to an inch of
QPF along and north of the US 10 corridor. The front should dip to
the south with the potential for scattered showers and storms
Sunday. The front continues to look to weaken as it progresses
southward, however there should be enough CAPE and instability to
allow for scattered storms.

- More organized showers and storms possible early next week

A broad upper level high should situated itself over CONUS early
next week. Over top this is will be successive short waves, a more
potent vort max associated with a short wave through spill over
the high and trek through Michigan Monday. Mid level moisture
along with +20C 850 Temps could bring another chance for
widespread precipitation Monday and Tuesday. There is still some
questions for timing and instability but signal is remaining
consistent so far.

&&

.AVIATION /06Z TAFS THROUGH 06Z SATURDAY/...
Issued at 145 AM EDT Fri Aug 15 2025

VFR weather is in place across all of the TAF sites at 06z. This
should remain the case right through the TAF period of 06z to 06z.
At this time we are not expecting fog or stratocumulus development
this morning. Cannot rule out very patchy fog, but not enough of a
signal to put in any TAF site at this point.

Some scattered cumulus development is likely again today with
bases between 5,000 and 6,000 feet. Winds light from the southeast
before daybreak will become south in the few hours after daybreak
and finally southwest by noon. Wind speeds will be light, on the
order of 5-9 knots.

&&

.MARINE...
Issued at 325 PM EDT Thu Aug 14 2025

A pleasant and relatively benign period of weather continues over
Lake Michigan for the next few days. A brief period of northwest
winds may locally enhance waves close to 2 ft or more for the next
several hours between Saugatuck and Muskegon, but if this happens
it will drop off again shortly after sunset. Otherwise, we`ll see
periodic changes in wind direction over the next few days over
the lake, but none of them will see winds more than 10 or 15
knots, so no hazardous weather is expected. The threat of storms
crossing the lake increases for Saturday and Sunday, but
confidence in timing or coverage remains low at this time.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.

&&

$$

DISCUSSION...Ceru
AVIATION...
MARINE...Ceru