Lafayette, Indiana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

272
FXUS63 KIND 301916
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
316 PM EDT Tue Jun 30 2026

.KEY MESSAGES...

- Hot and humid condition expected with highs in the 90s and heat
  indices peaking at 105 to 110 degrees in the afternoons through
  Thursday

- Extreme Heat Warning in effect through Thursday evening

- Thunderstorm chances will increase Friday through the holiday
  weekend

&&

.DISCUSSION (This evening through Tuesday)...
Issued at 316 PM EDT Tue Jun 30 2026

Ridging and high pressure will persist for much of the week, keeping
hot and humid conditions firmly in place. The ridge will finally
start to break day and push east Friday and allowing for daily
chances of showers and storms for the holiday weekend and into next
week.

The primary focus will be on the heat and humidity with several more
days of highs in the 90s and heat indices from around 100 to 110
each day. The hot, moist air is is being streamed into the region
from the SW and Gulf which is helping to keep the dew points in the
70s. Increased subsidence over the Ohio Valley will limit clouds and
diurnal cumulus clouds as well, especially Wednesday. Likely to see
a slight increase in cumulus development Thursday as moisture pivots
around the back side of the ridge and into the area, but it is
shallow and should not have much impact on expected highs.

Long range guidance depicts upper ridging flattening out towards the
end of the week with northwest flow developing aloft late weekend
into early next week. A few shortwaves aloft are expected to track
towards the region once the ridge begins to flatten. Weakening large
scale subsidence and modest dynamics from the approaching impulses
will provide greater opportunities for convection into the weekend.
Diurnal convection can also be expected with strong daytime heating
atop an anomalously moist PBL.

A few strong storms are possible with the potential for isolated
intense downbursts in the moisture rich unstable environment during
the afternoon or evening hours. Slow moving storms can also be
expected as forecast soundings depict very weak flow throughout the
column. This will support the potential for brief locally heavy
rainfall and mostly prevent severe weather potential outside of the
threat for isolated downbursts. A few MCSs may still develop
upstream and propagate towards the region over the weekend, but
specific details regarding this remain uncertain due to diverging
model solutions.

Humid conditions will continue through the weekend while
temperatures remain hot. Some slight relief from the heat appears
increasingly likely into early next week as guidance suggest a front
associated with a more organized shortwave could dive south. ECMWF
and GEFS members differ on exact timing of the front though.

&&

.AVIATION (18Z TAF Issuance)...
Issued at 157 PM EDT Tue Jun 30 2026

Impacts:

- Low Cu field through sunset

 Discussion:

VFR conditions are expected to prevail throughout the period.

A low Cu field is expected through much of the rest of the daylight
hours today sitting around 025 to 030 with thin cirrus clouds aloft
at times. Mostly clear skies should then move in tonight and should
last into tomorrow under ridging. Winds will generally be out the SW
throughout the period with wind speeds of 5 to 10 kt. A few sporadic
gusts, less than 20 kts are possible this afternoon.

Can`t rule out patchy fog during the early morning hours given how
humid conditions are across the area, but winds should be just high
enough to prevent anything widespread or dense. Will continue to
monitor and update if needed.


&&

.IND WATCHES/WARNINGS/ADVISORIES...
Extreme Heat Warning until 8 PM EDT Thursday for INZ021-028>031-
035>049-051>057-060>065-067>072.

&&

$$

AVIATION...KF
DISCUSSION...KF/Melo