Indiana’s Weather For Today

HEADLINES
– Rivers have already reached or are expected to reach moderate to major flood stage in Central and South Central Indiana, primarily in the White and East Fork White River basins.
– Widespread, significant river flooding continuing through at least the next 1 to 2 weeks in some spots.
– Rain Wednesday and Thursday, with less than an inch expected.
– Warming trend this weekend.

TODAY’S MAP

NWS TECHNICAL DISCUSSION

High pressure continues to build in the low levels beneath strong
CAA. This has led to clear skies across all of central Indiana as of
06Z, with quickly decreasing near surface temperatures. A Freeze
Warning remains in affect through 14Z this morning with all of
central Indiana currently at or below freezing and temperatures
expected to fall into the mid 20s by the morning.

As the PBL decoupled this evening, wind gusts have started to wane.
Still with a modest pressure gradient over central Indiana,
sustained winds will likely remain elevated for the next few hours.
These greater winds will begin to die off this morning into the
afternoon as winds back ahead of another shortwave. The overall
airmass will remain unchanged without any strong temperature
advection today, resulting in a very cool early April-day for
central Indiana. Current expectation is for temperatures to only
reach the mid 40s this afternoon. Thermal profiles due show a narrow
near saturated layer at the top of the PBL this afternoon. This
along with shallow instability will likely lead to scattered diurnal-
cu in the afternoon.

Overnight, winds will shift towards southerly as the wave approaches
from the west. Courser grid models have trended towards a quicker
onset of mid level clouds overnight of which will likely lead to a
less amplified diurnal swing. For this reason, there is higher
uncertainty on whether or not temperatures will fall below freezing
tonight. Still, light winds and more prolonged clearing over SE
portions of the area will likely lead a localized area of lower
temperatures, and for areas of frost to develop in locations like
Seymour, Greensburg and Columbus. Elsewhere, greater southerly winds
and more prolonged cloud cover should keep temperatures in the 34-36
range significantly lowering the risk of frost formation.

&&

.LONG TERM (Wednesday through Monday)...
Issued at 300 AM EDT Tue Apr 8 2025

Relatively quiet weather awaits us during the long range despite an
amplified progressive jet pattern.

Our next chance of measurable precipitation occurs on Wednesday as
an amplifying shortwave digs southward out of Canada. A potent low-
level jet is modeled to develop ahead of this feature as it
approaches Indiana, bringing warmer air and moisture northward.
Combined with the forcing from the shortwave itself, isentropic
ascent at the nose of this jet combined with low-level convergence
should promote precipitation development Wednesday morning. Precip
will be mostly rain, but enough dry air and marginally cold temps
may allow for snow to mix in at onset, mainly across northern
Indiana. Model soundings hint at some elevated CAPE, which may allow
for some weak convection at times especially south of Indianapolis.
Limited instability, moisture, and poor low-level lapse rates should
keep severe potential very low. Precipitation amounts should be
under an inch for most if not all locations. Ongoing river flooding
will not likely be impacted much by this rainfall.

A deeper trough arrives behind the departing shortwave on Thursday
bringing another shot of colder air with it. Temperatures at 850mb
dip as low as -5C, which isn`t as cold as the current trough
affecting the region. Winds do not appear to die down fully until
after sunrise Friday, so ideal radiative conditions are not
expected. That being said, temperatures should still drop at least
into the 30s Thursday night / Friday morning, simply from cold air
advection. Friday night into Saturday morning have the best
radiative conditions as surface high pressure arrives with clear
skies and light winds. Lows near freezing are likely with readings
in the upper 20s possible in more rural areas.

Ridging builds over the Plains this weekend as strong warm air
advection takes hold. Temperatures rise quickly here in Indiana with
highs returning to the 60s and potentially near 70 by Sunday. Strong
cyclogenesis over the northern Plains early next week looks to
strengthen the southwesterly flow, which may allow temps to end up
warmer than guidance currently suggests. We will not deviate too
much as it is still many days out. Additionally, these scenarios
tend to lead to gusty winds depending on how strong the upstream low
gets.

INDY SEVEN DAY FORECAST
Today: Mostly sunny. High 45.

Tonight: Partly cloudy. Frosty again. Low 30.

Wednesday: Mostly cloudy. Spotty morning snow showers. Scattered afternoon showers. High 49.

Wednesday Night: Rainy. Low 43.

Thursday: Scattered showers. High 58.

Thursday Night: Mostly cloudy. Low 38.

Friday: Partly sunny. High 52.

Friday Night: Mostly clear. Low 32.

Saturday: Sunny. High 57.

Saturday Night: Mostly clear. Low 36.

Sunday: Mostly sunny. High 63.

Sunday Night: Partly cloudy. Low 49.

Monday: Partly sunny. Spotty afternoon showers. High 74.

NWS CHARTS FOR TODAY/TONIGHT