Lafayette, Indiana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

436
FXUS63 KIND 252330
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
630 PM EST Tue Nov 25 2025

.KEY MESSAGES...

- Rain showers continue into tonight, transitioning to snow showers
  on Wednesday.

- Wind Advisory in effect from 7am to 7pm Wednesday, winds 20-30 mph
  with gusts 40-50 mph expected.

- Wind chills in the teens Thursday and Friday.

- Potential for accumulating snow Saturday to Sunday with colder
  weather persisting into early next week.

&&

.SHORT TERM (This evening through Wednesday)...
Issued at 252 PM EST Tue Nov 25 2025

A cold front extends from Minnesota southward through Iowa and into
Missouri as of 2pm. The air mass ahead of the cold front is rather
mild and humid, with rich moisture in the lower levels. This has
lead to modest amounts of instability primarily confined to under
3km. The shallow instability, combined with weak lift, has lead to
scattered light rain showers this afternoon. These should continue
through this evening and into the overnight.

The cold front itself looks to arrive around 3-6am. High-resolution
guidance hints at a line of heavier showers immediately along the
boundary. Given the modest low-level instability present, this does
not appear unreasonable. Some of these showers may even produce some
gusty winds. Winds should remain elevated even after the showers
pass. The MSLP gradient behind the front is expected to tighten
considerably as low pressure to our north intensifies.

Increasing surface pressure gradient is one factor for gusty winds
on Wednesday. The other is steep boundary layer (PBL) lapse rates
which will promote efficient downward momentum transfer during the
daylight hours. Guidance has gradually trended upward regarding
winds at the PBL/free atmosphere interface, so we`ve nudged wind
speeds up a bit compared to our previous forecast. Additionally,
we`ve issued a Wind Advisory for the majority of our CWA. Expect
sustained winds between 20-30mph with gusts 40-50mph.

Steep lapse rates, broad cyclonic curvature, and rich PBL moisture
will lead to continued precipitation potential on Wednesday.
However, as temperatures continue to cool from strong cold air
advection within the post-front environment, a transition to mostly
snow is expected. Accumulations are not expected. Most of the snow
on Wednesday will be either flurries or light snow showers.

Temperatures are expected to peak before sunrise Wednesday,
gradually falling through the 30s during the day as cold air
advection continues. Wind chills look to be in the upper 10s/20s
through the afternoon.

&&

.LONG TERM (Wednesday night through Tuesday)...
Issued at 252 PM EST Tue Nov 25 2025

Wednesday Night Through Friday.

By Wednesday night the stronger pressure gradients will begin to
relax along with a decoupling of the boundary layer which will bring
an end to the gusts of 40 to 50 mph.  Drier air will also work into
the area which will help to erode the residual clouds and help to
bring temperatures down into the low to mid 20s across central
Indiana with wind chills in the teens. Breezy conditions will return
during the daytime hours Thursday with gusts of 20-30 mph and wind
chills remaining in the teens through the day. Similar conditions
are expected for Friday with mostly clear skies, breezy conditions
and chilly temperatures.

Saturday Through Tuesday.

The main focus for the long term period will be tracking the
potential for an accumulating snow Saturday into Sunday. While many
of the finer details remain uncertain, the broader details are
beginning to become a bit more clear. Synoptically, an upper level
shortwave will push southeast out of the Northern Rockies with weak
southeasterly surface flow just ahead of the arrival of the low.
Confidence is increasing in the surface low track with broad model
agreement in central Indiana remaining in the "warm" sector of the
system as the low tracks from Missouri through Northern Illinois and
Lake Michigan.

Where details are still more uncertain and impactful will be surface
temperatures ahead of the arrival of precipitation and the impacts
on precipitation type. Latest trends over the last 12 hours have
been trending towards the GFS on timing with a less progressive low
pressure system with precipitation onset potentially as late as the
late morning/early afternoon hours on Saturday. Confidence is fairly
high in snow being the initial precipitation type before stronger
southerly flow advects warmer air into central Indiana through the
night. This non-diurnal temperature curve will help to transition
the snow to rain at some point during the night with overall snow
totals looking on the lower end compared to other recent model runs
due to the later precipitation onset time.

That being said, at least some travel impacts look likely during the
afternoon and evening hours Saturday with surface temperatures in
the upper 20s to low 30s ahead of onset with no expected issues for
the snow to stick as temperatures will be well below freezing in the
days leading up to Saturday. It remains very uncertain on specific
snowfall totals, but a reasonable expectation at this time looks to
be 1-2 inches across north central Indiana with 0-1 towards
Indianapolis and points to the south. There remains the potential
for both higher amounts and an all-rain scenario but those look to
be the less likely scenarios at this time. Snow ratios will also
likely end up on the lower end of normal at around 6-8:1 due to the
wet/slushy nature of the snow.

Going into Sunday much cooler temperatures will quickly move in as
the low moves into the Great Lakes and much colder air pushes in on
the backside of the system. There will be at least some mid-level
forcing on the backside of the system which will bring the potential
for additional snow chances through the day Sunday with some signs
of lingering flurries into Monday. Temperatures will then remain
below normal through Tuesday with another low-end chance for
additional snow Monday night into Tuesday.

&&

.AVIATION (00Z TAF Issuance)...
Issued at 629 PM EST Tue Nov 25 2025

Impacts:

- Subtle improvement from IFR to MVFR later this evening or tonight

- Light showers possible ahead of and along a cold front tonight

- Westerly winds increase pre-dawn Wednesday with peak gusts 30kt to
  40kt

- Light snow showers or flurries during the day Wednesday

Discussion:

IFR ceilings remain at a few sites, but some gradual improvement to
MVFR is likely over the next few hours. A cold front approaching
from the west will bring a few showers and scour out any remaining
IFR ceilings tonight. MVFR ceilings should persist through much of
the TAF period. Additionally, flurries or light snow showers are
possible Wednesday as colder air filters in. Brief minor visibility
reductions are possible. Confidence in impacts is low at this time
so only VCSH was mentioned.

A substantial increase in wind speeds is likely after the front
passes through. Winds will initially be out of the SW tonight before
becoming Westerly on Wednesday. Sustained winds between 20kt to 25kt
with gusts up to 40kt are possible. Winds will then gradually
diminish after sunset Wednesday.

&&

.IND WATCHES/WARNINGS/ADVISORIES...
Wind Advisory from 7 AM to 7 PM EST Wednesday for INZ021-028>031-
035>049-051>057-060>065-067-068.

&&

$$

SHORT TERM...Eckhoff
LONG TERM...White
AVIATION...Melo