Lansing, Michigan 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

674
FXUS63 KGRR 091115
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
715 AM EDT Wed Apr 9 2025

.KEY MESSAGES...

- Rain/snow mix today/tonight

- Warming trend through the weekend

&&

.DISCUSSION...
Issued at 330 AM EDT Wed Apr 9 2025

- Rain/snow mix today/tonight

Latest water vapor imagery shows a short wave moving across North
Dakota headed toward the Great Lakes. This wave will help to
develop the surface low over the Missouri Valley as it moves east
toward Lower MI later today. Models continue to show light
rain and snow developing this afternoon. The question remains how
much snow, if any, we`ll accumulate from late afternoon through
tonight.

We`re expecting surface temperatures to climb into the 40s this
afternoon prior to the onset of precipitation which would
certainly be a hindrance to snow development. However, current
dewpoints are fairly low...in the teens...and any precipitation
that begins will help to cool the column via wet bulb processes.
Due to this we lowered surface temperatures a couple of degrees
from late afternoon through the evening which resulted in some
light snow accumulation tonight. Ground temperatures are warming
which will also be a mitigating factor.

Two areas of snowfall accumulation could occur tonight. The first
is over the northeast cwa where temperatures are colder and we see
some lift via fgen processes. The second is closer to I-94 near
the low track that could see some higher precipitation rates that
overcome warmer ground temperatures. Both of those areas could see
an inch or so of accumulation tonight.

Whatever does accumulate tonight will melt Thursday as
temperatures warm into the 40s again.

- Warming trend through the weekend

The upper troughing will move east toward the weekend and with it
will go the cold air. Rising heights will lead to warmer
temperatures. Highs in the lower 50s Friday will warm to the upper
50s Saturday and into the 60s by Sunday with lower 70s possible
Monday. The weekend looks pretty dry at this point with the next
chance of rain arriving Monday.

&&

.AVIATION /12Z TAFS THROUGH 12Z THURSDAY/...
Issued at 715 AM EDT Wed Apr 9 2025

A clipper system will move through the Great Lakes region today
and tonight bringing deteriorating aviation conditions. VFR
weather will continue into the early afternoon hours before
conditions take a turn for the worse around 18Z. Conditions will
drop into the IFR and LIFR categories this evening and tonight as
a band of rain and snow pivots through the area. Ceilings will dip
to 400-600 feet with visibilities dropping to around 2 miles due
to falling rain and snow. Southerly winds today will shift to the
east tonight.

&&

.MARINE...
Issued at 330 AM EDT Wed Apr 9 2025

Some gusty winds may develop this afternoon near the Points which
could create a few winds gusts over 25 knots, however, most of the
wind/waves will remain below advisory criteria.

&&

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

&&

$$

DISCUSSION...04
AVIATION...Duke
MARINE...04