Lafayette, Indiana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

764
FXUS63 KIND 291857
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
257 PM EDT Mon Jun 29 2026

.KEY MESSAGES...

- Hot and humid condition expected for much of this week with
  multiple days in the 90s and heat indices over 100 degrees

- Heat Advisory in effect this afternoon through Thursday

- Thunderstorm chances will increase late week into the holiday
  weekend

&&

.DISCUSSION (This evening through Monday)...
Issued at 257 PM EDT Mon Jun 29 2026

Ensemble guidance is in excellent agreement showing anomalous
ridging this week across the Ohio River Valley. Ensemble mean 500mb
heights around 598dm are roughly 2-3 sigma above average for this
time of the year. Ridging remains roughly in place through about
Thursday, before gradually drifting eastward and weakening somewhat.
At the surface, prolonged southerly flow will continue to allow
moisture and warm air to flow northward.

The warm and deeply subsident atmosphere should act to prevent
shower or thunderstorm activity. Compressional heating combined with
modest warm air advection is expected to result in above-normal
warmth this week and likely into this weekend. High temperatures in
the low to middle 90s are probable, with lows in the 70s.
Additionally, dew points in the 70s will contribute to high heat
indices between 100-110 all of this week. A Heat Advisory has been
issued through Thursday evening.

As the ridge gradually drifts eastward later this week, subsidence
weakens allowing for the possibility of daytime / pop-up showers and
thunderstorms beginning on Friday. Severe weather is not currently
expected, since the jet stream is far to our north, but isolated
downbursts can never be ruled out in low-shear situations. Guidance
shows a weak cold front potentially arriving early next week, with
an increased risk of showers/storms. Upper-level flow remains
minimal, however, and organized severe weather does not appear
likely at this time.

&&

.AVIATION (18Z TAF Issuance)...
Issued at 128 PM EDT Mon Jun 29 2026

Impacts:

- Patchy ground fog possible early Tuesday morning

 Discussion:

Marginal MVFR ceilings are lifting as temperatures rise. Cloud bases
are now between 3000-3500 feet. Cumulus should ebb and flow between
SCT and BKN this afternoon, dissipating around 00-02z. Cirrus should
be present in some extent into tonight as well.

Winds remain out of the south today around 10kt, decreasing this
evening. Winds may become light enough to allow for some ground fog
at the typically fog-prone terminals. Chances are low, so this will
not be included in the TAFs for now.

Winds become southwesterly on Tuesday after sunrise, increasing to
between 5-10kt.


&&

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

&&

$$

AVIATION...Eckhoff
DISCUSSION...Eckhoff