475
FXUS63 KIWX 100953
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
553 AM EDT Sun Aug 10 2025

.KEY MESSAGES...

- Hot and humid through Monday with highs in the upper 80s to
  near 90 and heat indices in the low to mid 90s.

- Periods of showers and storms this week. The first chances
  will begin late tonight into Monday morning as a frontal
  boundary approaches from the northwest. Better chances across
  the area will be early Tuesday through Wednesday. Confidence
  remains low on exact timing and locations to be impacted.

&&

.DISCUSSION...
Issued at 319 AM EDT Sun Aug 10 2025

Hot and humid conditions continue today as the ridging still
remains stubbornly in place over the CWA. High temperatures
today in the upper 80s to low 90s. This coupled with the dew
points in the low to mid 70s will make for fairly uncomfortable
conditions. Heat indices in the mid to upper 90s for most
locations. The ridging has kept most of the activity up to our
north and further west along the periphery of the ridging. As
the ridge moves slowly east and southward, we will start to see
some of that activity inch closer into the northwestern portions
of our CWA late tonight into the early Monday morning hours. At
this time kept slight chances of showers as most of the
convection deteriorates as it pushes into the capping present
over the area. Monday again hot and humid but a degree or two
cooler with the increasing clouds. This will also bring the heat
indices down a couple degrees. It will still be uncomfortable
however.

Late Monday into Tuesday morning think the better chances for
showers and storms begins to push into the area along with the
boundary as we do get the stubborn ridging begin to push
southeasterly out of the area. The boundary will act as a better
forcing mechanism to overcome any residual capping. The cool front
does begin to bring in a little cooler airmass and a little bit
less humidity into the area. Tuesday we will see highs in the
mid to upper 80s. Our lows drop down back into the 60s Tuesday
night/Wednesday morning along with a more zonal flow aloft. We
see Wednesday highs in the low to mid 80s. This repeats for
Thursday. Still looking at some instability showers and a few
thunderstorms possible each afternoon, of course as is the
nature of instability driven convection it will be hard to
exactly where a shower/storm develops.

By Friday, we start to see another warming trend into the
weekend where we see a return to the more hot and humid
conditions. Saturday`s high temperatures will once again get
into the 90s and dew points back into the 70s.

&&

.AVIATION /06Z TAFS THROUGH 06Z MONDAY/...
Issued at 551 AM EDT Sun Aug 10 2025

Few changes were needed for the 12Z TAFs. Another tranquil, dry
day is expected across the forecast area today. A few showers
may be possible in NW Indiana and at KSBN very late tonight
into early Monday (mainly after 03-06Z Monday), but showers will
be so sparse that I opted to leave any mention of them out of
the TAFs for now. Will let subsequents shifts add precipiation
into the TAFs, if confidence increases. VFR ceilings are
expected to persist throughout the duration of the TAF forecast
period. Southeasterly winds will gradually switch to become
southwest by the late morning. Gusts to 20 kts are possible once
again this afternoon and evening at KSBN and near Lake
Michigan.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...None.

&&

$$

DISCUSSION...Andersen
AVIATION...Johnson