West Lafayette, Indiana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

307
FXUS63 KIND 050149
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
949 PM EDT Sat Jul 4 2026

.KEY MESSAGES...

- Heat Advisory through 9PM this evening

- Scattered to numerous thunderstorms will continue through the
  evening, with lower coverage overnight into Sunday

- Damaging winds and heavy downpours will be the main threats through
  this evening

- Trending cooler into next week with frequent chances for showers
  and storms

&&

.FORECAST UPDATE...
Issued at 949 PM EDT Sat Jul 4 2026

Thunderstorms over southern portions of central Indiana will
continue to weaken and diminish through 04Z/midnight EST as the
atmosphere continues to stabilize. A decent amount of stratiform
precip with embedded thunder will continue to dissipate over areas
north of I-70 next few hours as well. POPs have been lowered most
areas overnight to account for the sharp drying trend already
developing into northwest portions of central Indiana that will
slowly spread east to areas along and west of I-65.

&&

.DISCUSSION (This evening through Saturday)...
Issued at 222 PM EDT Sat Jul 4 2026

Rest of This Afternoon into This Evening...

An old boundary was near Interstate 70 early this afternoon. Cumulus
were developing near and along this boundary. Meanwhile, an MCV was
moving into northern Illinois. With continued hot and humid
conditions, MLCAPE was approaching 2000 J/kg. Shear was weak.

Scattered thunderstorms may develop along the old boundary, while
convection had already developed in Illinois in advance of the MCV.
Expect the most coverage of convection to be associated with the MCV
and focused on the northern half of central Indiana. However, will
also have to monitor how coverage of convection in southern Illinois
develops.

Severe convection is possible given the instability, with downbursts
possible with the scattered convection not associated with the MCV.
The MCV influenced convection could become more organized and form a
cold pool. This will increase the threat of damaging winds with
these.

Present indications are that the highest severe threat and most
coverage will be 22-02Z (6PM to 10PM EDT).

Will go likely PoPs across the northern half or so of the forecast
area with the best forcing from the MCV and go lower PoPs to the
south.

Temperatures have yet to reach 90 this afternoon, but with heat
indices still approaching 100 and with a lot of people outside
today, will continue the Heat Advisory as is.

Overnight tonight through Sunday night...

Some weak forcing will continue overnight so kept some chance PoPs
around. Severe weather is not expected with diminished instability.
With extra particulates in the air tonight and humid conditions,
patchy fog is likely overnight. Lows will be in the mid 60s to
around 70.

An upper trough and weak surface front will be across the area on
Sunday, so scattered showers and thunderstorms will continue.
Highest coverage will be in the afternoon. More clouds will be
around on Sunday, and high temperatures will be cooler. Highs will
be in the lower to middle 80s. Instability will be weaker Sunday, so
severe storms are not expected.

Rain chances will diminish Sunday evening as heating is lost.

Monday...

Upper troughing will linger across the area on Monday so kept some
slight chance to chance category PoPs around. Temperatures will peak
in the lower and middle 80s.

Tuesday and Wednesday...

Part of the upper ridge will try and sneak back into the area. High
pressure will be in control at the surface for most areas. Thus, dry
conditions are expected, with temperatures returning to the
middle and upper 80s.

Thursday and beyond...

Upper flow will become northwest with upper waves moving through the
flow. This will bring a return of daily chances for showers and
thunderstorms. A surface cold front will move into the vicinity
around Friday as well.

Questions remain on the timing and strength of the upper waves and
on the timing of the cold front. Will have PoPs each day, but
confidence is low on timing of the highest PoPs.

Temperatures in the middle and upper 80s Thursday should give way to
the lower and middle 80s by Saturday, but this may change depending
on the timing of the surface front.

&&

.AVIATION (00Z TAF Issuance)...
Issued at 807 PM EDT Sat Jul 4 2026

Impacts:

- Scattered to numerous convection ending by 04Z.
- MVFR visibility in fog likely overnight. Stratus is possible.
- Additional storms may develop across area tomorrow afternoon.

Discussion:

Scattered thunderstorms continues across central Indiana but will
diminish quickly between through 03Z. Overnight, a few showers will
remain possible especially near KBMG through 07Z. Light winds and
cooler temperatures and residual warm ground will support MVFR
visibilities and may support isolated areas of fog late tonight
after 06Z.

Any areas of fog will end quickly after sunrise. Destabilization
will lead to potential for another round of showers and storms
Sunday afternoon and have added PROB30 for these conditions.


&&

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

$$

UPDATE...Crosbie
AVIATION...Crosbie
DISCUSSION...50