940
FXUS63 KIND 241237 AAA
AFDIND

Area Forecast Discussion...UPDATED
National Weather Service Indianapolis IN
837 AM EDT Mon Jun 24 2024

.KEY MESSAGES...

- Some thunderstorms possible late tonight north, potentially with
  gusty winds.
- Tuesday likely to be warmest day of the week.
- More thunderstorms possible Tuesday into Wednesday, with one or
  more rounds of strong to severe storms possible, though uncertain.
- A brief respite from heat and humidity late in the week.

&&

.FORECAST UPDATE...

Onset of surface heating has caused areas of shallow fog to
diminish. Surface ridge axis placement causing light winds and
slightly less moist air mass with seasonal temperatures will result
in a pleasant day. No forecast changes needed.

&&

.SHORT TERM (Today and tonight)...
Issued at 305 AM EDT Mon Jun 24 2024

Today...

A quiet day is in store today as surface high pressure moves across
central Indiana. This will keep some drier air across the area and
keep winds lighter.

A few cumulus will pop up, mainly northeast where cooler air aloft
will be. Some cirrus will pass by as well, but overall still expect
mostly sunny conditions.

Temperatures will be a little above normal and peak in the middle to
upper 80s.

Tonight...

An upper level wave will approach the area from the northwest
overnight tonight. 850mb winds will become west/southwest and
increase in speed. Isentropic lift and some frontogenetical forcing
will arrive overnight with these features.

The best forcing will be northwest/north of the area and should
generate some thunderstorms, some of which may slide into the
forecast area late tonight. Questions remain on coverage of
the storms as well as moisture availability this far south for the
storms to survive on.

CAMs are trending upward in storm coverage, giving support for at
least some convection around. Will increase PoPs across the northern
forecast area late tonight. Given the uncertainty, will keep them
low for now. If trends continue, may have to up them with later
forecasts.

With higher winds aloft, there is a low chance that some of the
storms may be strong enough for some gusty winds, perhaps near
severe levels. Confidence is low in this at the moment.

Temperatures will be warmer with the surface high off to the east
and some increase in cloud cover. Lows will be in the middle 60s to
around 70.

&&

.LONG TERM (Tuesday through Sunday)...
Issued at 305 AM EDT Mon Jun 24 2024

Warmth will continue through the long term period although more
bearable and closer to normal than has been seen in the past week or
two. Outside of Tuesday, which is expected to have widespread 90s,
highs should largely stick to the 80s. This period will also see
multiple thunderstorm chances, occurring Tuesday and Wednesday and
again sometime this weekend. The early period system also has a the
potential for isolated severe storms.

Tuesday will start off with a slight chance of storms from a
decaying complex but the better chance of storms will arrive Tuesday
night through Wednesday. Most likely will see another day of
widespread highs in the 90s on Tuesday but if storms stick around
long enough Tuesday morning, this may not be realized. More than
likely though, that heat and humidity will have a chance to dominate
before the cold front from a low pressure system arrives Tuesday
night. Storms forming along and ahead of the front should bring some
welcome rain amounts to the area. There is a marginal chance of
severe storms with this line of rain as ample CAPE will be present
and moderate shear. It will likely be that micro to mesoscale
features should drive any severe activity, and damaging winds will
be the main threat.

The front should make it all the way across the forecast area by
late Wednesday, leaving behind cooler temperatures and a few days
relief from humidity. Unfortunately, the heat and humidity are
expected to return for the weekend but highs should only top out in
the upper 80s to near 90. Models still lack agreement on timing, but
they do show that another system should bring additional rain
chances to the area at some point this weekend.

&&

.AVIATION (12Z TAF Issuance)...
Issued at 637 AM EDT Mon Jun 24 2024

Impacts:
 - Lingering fog at all but KIND very early in the period
 - Potential for convection at KLAF late in the period

Discussion:

Ground fog will linger at the outlier sites very early in the period
until mixing improves conditions. Otherwise, a few cumulus will pop
up this afternoon.

Tonight, convection to the north of central Indiana may move in
after 07Z, impacting mainly KLAF. Confidence too low to include this
far out though.


&&

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

$$

UPDATE...BRB
SHORT TERM...50
LONG TERM...KF
AVIATION...50