Lafayette, Indiana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

318
FXUS63 KIND 081147
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
747 AM EDT Fri May 8 2026

.KEY MESSAGES...

- Chance for light showers later this afternoon into tonight,
  mainly across north Central Indiana.

- Milder Friday into the weekend, with numerous showers and isolated
  thunderstorms Friday afternoon into Friday night.

- Additional chances for precipitation Saturday night into Sunday
  and again towards mid week, temperatures remaining near to
  below normal.

&&

.DISCUSSION (Today through Thursday)...
Issued at 330 AM EDT Fri May 8 2026

Today through Sunday night...

Recent more-active pattern will continue through the late week and
weekend, albeit with less-impressive disturbances...that will
bring the potential for isolated non-severe thunder, yet perhaps
moderate rainfall late today into tonight given system slow
progression. Central Indiana will remain in the belly of an
anomalously deep and broad H500 trough spinning around the
southern banks of Hudson Bay, with an associated very weak yet
quasi-stagnant trough of surface low pressure slowly advancing
from the Upper Midwest today to the Ohio Valley by Sunday night.

More southern-extending assemblage of weaknesses near the Ozarks to
Chicagoland will help focus a small portion of more impressive
western Gulf moisture north across much of the Midwest by late
today.  Steadily increasing coverage of showers can be expected
along a SW-NE aligned axis of best lift that will slowly slide
from near Lafayette early this afternoon...to the Indianapolis
Metro by sundown...and to Seymour by 07Z tonight. Isolated non-
severe thunder to accompany increasing rain rates late today, with
most rain falling within the 00Z to 08Z timeframe tonight. Axis
of 0.50-0.75 inches of rain is expected by dawn Saturday near I-70
and south to US-50, with otherwise light rainfall for the
region`s north-northwestern third and towards the Ohio Valley.

Damp conditions to set in tonight into early Saturday as showers
taper off and depart east...with a shallow saturated isothermal layer
under 900 mb trapping moisture and low stratus into much of Saturday
morning.  Moderate confidence in tranquil conditions Saturday PM
under weak differential NVA, with at least partial clearing promoting
robust west-southwest winds gusting to 15-25 mph through sundown.

The very weak cold front will then cross the CWA Saturday evening,
with modest anafrontal lift providing widely scattered showers
overnight and into much of the day Sunday south/east of Indianapolis.

Monday through Thursday...

Indiana will remain in an overall zonal and somewhat progressive
pattern, with the state positioned between short waves descending
from the Canadian Plains to the Great Lakes...and a stagnant
subtropical ridge aligned over much of western North America.
Amplified Canadian high pressure will slowly cross the region to
start the workweek...before the southern side of a small system
brings opportunities for showers within an 18-hour window Tuesday to
Tuesday night.  Despite brief return of better precipitable water,
so far appears general lack of instability should allow only
scattered showers and a few general thunderstorms...although the
system potency would trend upward if the parent wave plunged farther
south.

The mid-week most likely to feature a slow transitional, and mainly
dry day Wednesday as weaker high pressure attempts to build into the
area...and actually a pleasant spring day to end the long term with
lighter winds under partly sunny skies promoting readings near mid-
May normals.  Patchy early morning fog will be on the table at times
through the long term with light NW/N breezes, if not pre-dawn light
winds.  Mainly below-normal readings will include overnight lows in
40s to around 50F...while afternoons slowly moderate through the 60s
into the 70s.

&&

.AVIATION (12Z TAF Issuance)...
Issued at 745 AM EDT Fri May 8 2026

Impacts:

- Occasional gusts as high as 18-24KT within 15Z-22Z
- -SHRA expanding this afternoon...slowly tapering off from NW to SE
  from 00Z at KLAF...to a bit after 08Z Saturday at KBMG
- MVFR VIS possible at times after 22Z
- MVFR or worse CIG developing 04Z-05Z Saturday, lingering through
  most of Saturday morning

Discussion:

VFR conditions to continue near central Indiana terminals through at
least 18Z this afternoon.  Clear skies early today will be replaced
by increasing decks through midday ahead of -SHRA.  Winds to also
increase from the southwest, with gusts to 13-24KT within 15Z-22Z.

Next disturbance will cross the Midwest later today and tonight,
bringing slowly increasing coverage of mainly light showers from NW
to SE after 16Z.  Any thunder will be too isolated to include in TAFs.
Occasional MVFR VIS is possible as noted in PROB groups, with
confidence too low to include at KLAF.  Ceilings to deteriorate later
tonight as -SHRA slowly taper off from NW to SE with MVFR or worse
developing quickly in the early overnight.

&&

.IND WATCHES/WARNINGS/ADVISORIES...None.
&&

$$

AVIATION...AGM
DISCUSSION...AGM