785
FXUS63 KIND 181730
AFDIND

Area Forecast Discussion
National Weather Service Indianapolis IN
130 PM EDT Sat Apr 18 2026

.KEY MESSAGES...

- Showers and isolated thunderstorms this morning, diminishing
  this afternoon

- Temperatures falling today into the 50s

- Much cooler Sunday into Monday with the potential for patchy frost
  tonight followed by near freezing temperatures and more frost
  early Monday morning

&&

.FORECAST UPDATE...
Issued at 1053 AM EDT Sat Apr 18 2026

Stratiform rain continues across central Indiana as a cold front
moves through. Temperatures have fallen into the upper 40s at
Lafayette as of 10am, with the front itself located just west of the
Indy metro area. Expect a quick 5 to 10 degree drop in temperatures
with an abrupt wind shift from SW to NW. The front should exit our
CWA to the southeast by 2-3pm.

&&

.DISCUSSION (Today through Friday)...
Issued at 253 AM EDT Sat Apr 18 2026

Early This Morning through Today...

Convection continues to weaken across central Indiana early this
morning. Will lower PoPs for a while, especially southeast. The old
outflow is slowing down across the central forecast area while
continuing to move east farther to the north. Some gusty winds and a
temperature drop will occur behind that boundary.

With the surface cold front still to move through this morning and
the upper trough still approaching, there should be enough forcing
for additional showers to move across the area this morning. Will go
with likely or higher category PoPs across much of the area after
12Z. However, PoPs will diminish from northwest to southeast during
the day as the significant forcing exits. Some rumbles of thunder
will be around, but no strong or severe convection is expected with
the instability east of the area today.

Temperatures will fall today with cold advection, with perhaps some
small rebound during the afternoon as clouds decrease some. Still,
readings will only be in the 50s by then.

Tonight through Sunday night...

Clouds will continue to decrease tonight. Winds will diminish but
not go calm. These conditions will allow readings to fall into the
middle and upper 30s. Some patchy frost may form across the northern
half or so of the area, especially in protected areas. At the
moment, do not feel coverage will amount to the need for a Frost
Advisory, but will watch trends closely.

Some upper energy and a secondary cold front could bring an isolated
shower to mainly northern portions of the area on Sunday. Highs will
be in the mid 50s to lower 60s.

Colder air moving in behind the front, clearing skies, and
diminishing winds will bring lows in the lower to middle 30s to the
area Sunday night. There is the potential for freezing temperatures
north, and frost will be more widespread. There will likely be a
need for Frost Advisory, and a Freeze Warning will not be out of the
question in the far north.

Monday onward...

Quiet weather will continue Monday into Tuesday, but a weak front
will bring low chances for rain around Wednesday. Better chances for
rain arrive Friday into next Saturday with a potentially stronger
surface cold front moving through.

Below normal temperatures will persist Monday, then above normal
readings can be expected for much of the remainder of next week.

&&

.AVIATION (18Z TAF Issuance)...
Issued at 130 PM EDT Sat Apr 18 2026

Impacts:

- Wind gusts 20-30kt this afternoon, diminishing this evening.
- Scattered showers early, brief reductions in visibility possible.
- Wind gusts between 20-30kt once again on Sunday.

Discussion:

A cold front has moved through central Indiana with winds now out of
northwest at all terminals. Winds are between 15-20kt sustained with
gust to around 25-30kt. These winds die down overnight as surface
high pressure arrives.

IFR to MVFR ceilings persist across the area and are gradually
clearing as high pressure builds in and dry air flows in from the
northwest. Rain showers are present but should gradually decrease as
the front moves further away. Some brief reductions in visibility to
MVFR are possible.

Winds turn westerly and increase again on Sunday as an weak mid-
level system passes just to our north. Wind gusts are expected to
again be between 20-30kt. Additionally, a few rain showers are
possible Sunday afternoon just beyond the end of the current TAF
period.

&&

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

$$

UPDATE...Eckhoff
AVIATION...Eckhoff
DISCUSSION...50