Mattawan, Michigan Weather Forecast Discussion

020
FXUS63 KGRR 261709
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
109 PM EDT Fri Sep 26 2025
.KEY MESSAGES...
- Fog this morning with chance of rain this afternoon
- Warmer and Drier weather ahead
&&
.DISCUSSION...
Issued at 550 AM EDT Fri Sep 26 2025
- Fog this morning with chance of rain this afternoon
Clearing skies and light winds at the surface has provided for a
better environment for fog development this morning. The dew
point depression remains around zero with a very moist surface
However, while periods of dense fog will occur, there is enough
wind where fog will shift and visibility will improve periodically
at times. The inversion is extremely shallow, which helps to
explain the changing visibility, however, periods of dense fog
will continue through sunrise before lifting and dissipating by
mid morning due to clear skies. Temps should increase by 9 to 10
AM to allow any lingering clouds to clear.
A weak frontal boundary will sweep through northern lower and
clip the US 10 corridor. There is enough lift and moisture to
allow for a chance of rain through central Michigan.
- Warmer and Drier weather ahead
A ridge will continue to move over head through the weekend and
into next week this which will bring warmer and drier weather.
Temps could reach into the 80s Sunday and into next week. Expect
the warm weather to continue until around mid week. An upper level
trough moving through Eastern Canada could move southward through
the NE US and into the Mid Atlantic, that could push the ridge
westward, and cause some cold air advection that would drop Max
temperatures closer to normal.
&&
.AVIATION /18Z TAFS THROUGH 18Z SATURDAY/...
Issued at 109 PM EDT Fri Sep 26 2025
VFR conditions are expected through this evening with scattered
daytime Cu around 4kft across West Michigan. Tonight, conditions
will be favorable for patchy fog development as skies remain
clear and winds subside. Have added MVFR restrictions at
MKG/AZO/LAN where better low-level RH will be and slightly weaker
winds aloft will be present. Best potential for fog development
looks to be across Central Lower Michigan to the north of the
terminals. Further south, have gone with no restrictions at this
time, and will monitor dewpoint trends through the afternoon to
see if any may be needed in subsequent updates. Look for west
winds around 5 knots today becoming light and variable overnight;
before increasing from the southwest on Saturday to around 5-10
knots.
&&
.MARINE...
Issued at 354 AM EDT Fri Sep 26 2025
Conditions are expected to remain below Small Craft Advisory/Beach
Hazards Statement levels the next several days as a weak gradient is
in place across the area.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.
&&
$$
DISCUSSION...Ceru
AVIATION...Thomas
MARINE...Ceru

NWS GRR Office Area Forecast Discussion