185
FXUS63 KGRR 062320
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
720 PM EDT Mon Apr 6 2026
.KEY MESSAGES...
- Snow showers this evening
- Fair Tuesday then rain chances return
&&
.DISCUSSION...
Issued at 251 PM EDT Mon Apr 6 2026
- Snow showers this evening
Shortwave trough and sfc cold front moving through this afternoon
and evening with enough surace-based instability to bring
diurnally enhanced rain,graupel, snow showers through early
evening. Then the really cold air moves in with 850mb temps
dropping to -15C tonight as the thermal trough swings through.
This will be cold enough to provide some lake-enhancement with
snow showers and flurries persisting overnight before surface
ridging builds in and subsidence and drying bring clearing by
Tuesday morning.
- Fair Tuesday then rain chances return
Fair and cold weather into Wednesday morning, then the surface
high moves east and we go back to return flow of warmer but
increasingly moister air. A baroclinic zone and weak front is
across Lower Michigan by early Thursday with rain diminishing by
late Thursday as the front dags south and washes out. Unsettled
weather expected into early next week with potential for
significant rain and convection as Plains cyclogenesis moves
northeast across the Great Lakes, with the details uncertain on
specific timing and tracks of the surface lows.
&&
.AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/...
Issued at 718 PM EDT Mon Apr 6 2026
Radar shows light snow showers moving south across the terminals.
A shot of colder is is poised to flow over the lake tonight and
we`ll see lake effect snow showers continue. However, by morning,
high pressure will be moving overhead and boundary layer winds
will move to a northerly or northeasterly direction, putting an
end to the precipitation. VFR conditions are expected through the
period. However, for a few hours this evening, MKG/GRR may see
cigs around 2500 ft.
&&
.MARINE...
Issued at 251 PM EDT Mon Apr 6 2026
No changes to the SCA. Some gales of 35 knots are possible this
evening north of Whitehall, Winds and waves will quickly decrease
on Tuesday morning as high pressure builds in then pick up again
from the south or southwest on Wednesday as the high moves east,
&&
.HYDROLOGY...
Issued at 251 PM EDT Mon Apr 6 2026
No significant rain is expected until Wednesday night and Thursday
when one quarter to half an inch is forecast across the Muskegon
Basin with lesser amounts to the south across the Grand and
Kalamazoo river basins. Until then, crests will continue moving
downstream across the rivers.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory until 8 AM EDT Tuesday for LMZ844>849.
&&
$$
DISCUSSION...Ostuno
AVIATION...04
MARINE...Ostuno
HYDROLOGY...Ostuno
NWS GRR Office Area Forecast Discussion
