Plainfield, Indiana 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

695
FXUS63 KIND 290402
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
1202 AM EDT Mon Jun 29 2026

.KEY MESSAGES...

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

- Heat Advisory in effect Monday afternoon through Thursday

&&

.FORECAST UPDATE...
Issued at 1016 PM EDT Sun Jun 28 2026

Only minor adjustments made to most forecast variables this evening,
as things seem to be well in hand. A few weak radar echoes to our
north suggest an outside possibility of a sprinkle or two, but
nothing of impact or worthy of a measurable PoP.

Do think that guidance is underdoing fog potential, even with a bit
of high cloud over portions of the area. Winds will be fairly light
and dewpoints are incredibly high, particularly in the southern
forecast area, and ample rain has fallen in recent days across
portions of central Indiana as well. Will introduce a bit more of a
fog mention to grids in parts of the area, particularly south. This
is more robustly supported by NBM probabilistic data.

&&

.DISCUSSION (This evening through Sunday)...
Issued at 231 PM EDT Sun Jun 28 2026

Skies remained partly to mostly cloudy across central Indiana this
afternoon, and this will remain the case for the rest of the day.
While broken cumulus will eventually scatter out late in the
afternoon into early evening, high clouds will increase from dying
thunderstorms to the northwest.

Will have to keep an eye out for the remnants of the upstream storms
early this evening. They should weaken/dissipate as they approach
the area, but it may take longer than the CAMs suggest per recent
trends. Will keep the forecast area dry but continue to monitor.

Otherwise, a warm front with the hot airmass behind it will move
across the area tonight. Forcing isn`t great so am expecting mainly
some clouds. However, can`t rule out an isolated shower. Odds will
remain below mentionable thresholds. With the moist atmosphere in
place, some patchy fog may form again overnight. Lows will be in the
lower to middle 70s.

On Monday morning, the warm front will be near or just east of the
forecast area. A rogue shower will still be possible east, but again
odds are too low to mention. The front will then exit to the east as
the upper ridge builds across the area. The ridge should be strong
enough to keep any storms riding around it east of the area Monday
afternoon.

This ridge will persist across the area at least through Wednesday.
The airmass will be a hot and humid one, with highs in the lower to
perhaps middle 90s and dewpoints in the lower to middle 70s. This
will produce afternoon heat indices of 100 to 105 for most areas
with locally higher values. Given this, the Heat Advisory looks good
and will make no changes at this time.

The ridge will may start to break down as early as Thursday, and by
next weekend some guidance is showing an upper trough moving in.
These will result in a return of chances of showers and
thunderstorms.

Blended guidance is keeping highs in the 90s into next weekend, but
that may be too warm given more clouds and increasing chances for
rain with the upper trough.

&&

.AVIATION (06Z TAF Issuance)...
Issued at 1202 AM EDT Mon Jun 29 2026

Impacts:

- Patchy MVFR fog possible overnight, periods of IFR possible at KBMG

Discussion:

High level convective cloud debris will continue to drift southeast
across the region over the next few hours. Still feel LAMP guidance
is underforecasting fog potential...and NBM probabilities tend to
hint at somewhat more possibility for visibility restrictions
predawn and through daybreak. Greatest potential will be at outlying
terminals and will continue with a period of tempo MVFR. At KBMG
which is both climatologically vulnerable and in one of the wetter
regions of the area in recent days...IFR visibilities will be
possible later in the overnight.

VFR conditions are expected once any fog dissipates in typical
diurnal fashion by mid morning. Diurnal cu is possible for this
afternoon before diminishing as skies clear this evening. S/SW
winds up to 10kts are possible later today.

&&

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

&&

$$

UPDATE...Nield
AVIATION...Ryan
DISCUSSION...50