Flash Flood Warning 23, NWS Indianapolis, IN

622 
WGUS73 KIND 270703
FFSIND

Flash Flood Statement
National Weather Service Indianapolis IN
303 AM EDT Sat Jun 27 2026

INC083-270845-
/O.CON.KIND.FF.W.0023.000000T0000Z-260627T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Knox IN-
303 AM EDT Sat Jun 27 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 AM EDT EARLY THIS 
MORNING FOR SOUTHWESTERN KNOX COUNTY...

At 303 AM EDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 3.5 inches of rain have 
fallen since 12 am EDT. Additional rainfall amounts  up to 1 inch 
are possible in the warned area. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

IMPACT...Flash flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other poor
         drainage and low-lying areas.

Some locations that will experience flash flooding include...
  Decker.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3851 8729 3854 8736 3851 8737 3854 8740
      3853 8748 3850 8750 3852 8754 3849 8754
      3850 8759 3845 8760 3846 8765 3843 8766
      3842 8772 3841 8774 3845 8773 3846 8776
      3851 8765 3855 8767 3858 8725 3853 8726

FLASH FLOOD...RADAR INDICATED

$$

Ryan

856 
WGUS53 KIND 270830
FFWIND
INC083-271015-
/O.EXT.KIND.FF.W.0023.000000T0000Z-260627T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Indianapolis IN
430 AM EDT Sat Jun 27 2026

The National Weather Service in Indianapolis has extended the

* Flash Flood Warning for...
  Southwestern Knox County in southwestern Indiana...

* Until 615 AM EDT.

* At 430 AM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3.5 inches of 
  rain have fallen since 12 am EDT. Additional rainfall amounts of 
  0.5 to 1.5 inches are possible in the warned area. Flash flooding 
  is ongoing or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Decker.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3851 8729 3854 8736 3851 8737 3854 8740
      3853 8748 3850 8750 3852 8754 3849 8754
      3850 8759 3845 8760 3846 8765 3843 8766
      3842 8772 3841 8774 3845 8773 3846 8776
      3851 8765 3855 8767 3858 8725 3853 8726

FLASH FLOOD...RADAR INDICATED

$$

Ryan

121 
WGUS73 KIND 271010
FFSIND

Flash Flood Statement
National Weather Service Indianapolis IN
610 AM EDT Sat Jun 27 2026

INC083-271020-
/O.EXP.KIND.FF.W.0023.000000T0000Z-260627T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Knox IN-
610 AM EDT Sat Jun 27 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 615 AM EDT THIS MORNING FOR 
SOUTHWESTERN KNOX COUNTY...

The heavy rain is ending. Flash flooding is no longer expected to 
pose a threat. Please continue to heed remaining road closures.

A Flood Watch remains in effect until 200 PM EDT Saturday for 
portions of central, south central, southeast, southwest, and west 
central Indiana.

&&

LAT...LON 3851 8729 3854 8736 3851 8737 3854 8740
      3853 8748 3850 8750 3852 8754 3849 8754
      3850 8759 3845 8760 3846 8765 3843 8766
      3842 8772 3841 8774 3845 8773 3846 8776
      3851 8765 3855 8767 3858 8725 3853 8726

$$

Ryan

Area Forecast Discussion
National Weather Service Indianapolis IN
1245 AM EDT Sat Jun 27 2026

.KEY MESSAGES...

- Flood Watch from through Saturday afternoon for southern portions
  of central Indiana with 1 to 3 inches of rain possible

- Multiple rounds of showers and storms producing torrential
  rainfall and localized flooding expected through Saturday night

- Isolated severe storms possible across south central Indiana this
  afternoon and evening

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

&&

.FORECAST UPDATE...
Issued at 1018 PM EDT Fri Jun 26 2026

Model and ACARS soundings continue to depict a deeply
saturated/pseudotropical airmass in place across central Indiana
tonight, with near-saturation up through about 450 mb and moist
adiabatic lapse rates through the tropopause. Minimal instability is
available as a result, with larger values concentrated south of the
area where more widespread and stronger deep convection has occurred
tonight, in part driven by a remnant MCV.

CAMs depict some additional shower activity and perhaps a rumble of
thunder overnight, with chances highest across the south obviously,
and have made some PoP adjustments in this respect, though with a
lack of more significant upper level support, suspect coverage and
intensity will be limited for much of the area. That said,
precipitable water values remain near 2 inches, and even showers
will be capable of quick heavy downpours. These limited hydrologic
concerns will be the primary issue overnight.

Blended in latest short term guidance which keeps temperatures
largely steady or very slowly falling a few degrees at most
overnight with the boundary moving little, expansive cloud cover,
and dewpoints in the mid 60s to low 70s across the area. This bumped
the min temps up slightly, primarily central and north.

&&

.DISCUSSION (This evening through Friday)...
Issued at 319 PM EDT Fri Jun 26 2026

Today through Saturday Night

Quasi-zonal flow aloft above an east-west oriented baroclinic zone
will allow a mid-level wave to progress into Indiana this evening.
Surface low pressure associated with the wave will allow the
baroclinic zone to lift northward as a warm front this afternoon.
Numerous showers have developed today, initially from broad
isentropic lift but some convective elements have also developed
this afternoon. Low-level instability increases with time as the
warm and buoyant air mass behind the front advects northward.

Though instability never becomes abundant, it likely becomes at
least sufficient for continued scattered convective development into
tonight. As the low approaches, model hodographs show some
elongation and curvature in the 1-2km layer due to a strengthening
low-level jet. Given a temperature profile that shows roughly moist
adiabatic lapse rates, relatively shallow convection with minimal
lightning is possible today. Despite this, some of these
showers/storms may exhibit mesocyclone development due to the low-
level shear profile. As such, isolated tornadoes are possible later
today into tonight mainly across our southwest where better surface
lapse rates are found. Strong wind gusts are also possible if
activity can congeal into a line or cluster.

Our primary threat, however, is flooding and heavy rainfall. With
deep moisture, moist adiabatic lapse rates, and a deep warm cloud
layer, we can expect efficient rainfall processes today.
Additionally, hodographs indicate that mature convection could
become slow to stationary at times. Very heavy rainfall rates with
prolonged duration across already moist ground may lead to a
flooding and flash flooding threat through tonight. Additional
showers and thunderstorms are possible on Saturday as the low
pressure itself sits overhead, though activity will be more isolated
in nature. The Flood Watch will be extended until 18z Saturday to
account for this.

Convective coverage is a bit uncertain through tonight due to the
relatively weak surface forcing as well as a mid-level wave that is
weaker on recent model runs compared to earlier ones. Convective-
allowing models have a difficult time with storm placement in such
situation, and run to run consistency is likely to be quite low.

Sunday into Next Week

A few storms may linger into Sunday morning but the trend will be
for the frontal boundary to lift north of the area Sunday as deep
ridging expands into the Ohio Valley. This will serve as the
transition point towards progressively hotter and more humid
conditions that will last through much of next week as the core of
the ridge peaks with heights at 596-597dam. Multiple days with highs
in the 90s are anticipated with the highest heat indices of the
summer so far rising into the 100s during the afternoons. Isolated
late afternoon and evening convection may develop by late next week
as the mid-level heights begin to fall back. As the upper ridge
retrogrades to the southwest next weekend...will need to monitor for
an increased risk for convective clusters riding along the periphery
of the ridge impacting parts of the region.

&&

.AVIATION (06Z TAF Issuance)...
Issued at 1245 AM EDT Sat Jun 27 2026

Impacts:

- IFR or worse conditions through the morning in fog, low ceilings,
  and scattered showers/perhaps a few thunderstorms

- Conditions improving to MVFR in the afternoon but with scattered
  convection redeveloping

Discussion:

Poor flying conditions will persist through the morning with only
marginal improvement into the afternoon as deep moisture remains
trapped over the region in the vicinity of a frontal boundary.
Ceilings at 500ft and lower are expected through daybreak with slow
lifting by midday. The boundary layer remains saturated however with
stratus lingering in the MVFR category through tonight.

The convective threat is messy and chaotic with the boundary
remaining in the area. The bulk of the showers through mid morning
will remain over southern parts of central Indiana with any impacts
being confined especially to KBMG and possibly KHUF. As the
atmosphere destabilizes this afternoon...scattered convection will
develop and may impact all of the terminals. Showers and storms will
likely persist through this evening before gradually diminishing
tonight.

&&

.IND WATCHES/WARNINGS/ADVISORIES...
Flood Watch through this afternoon for INZ051>053-060>065-
067>072.

&&

UPDATE...Nield
AVIATION...Ryan
DISCUSSION...Ryan/Eckhoff

Hazardous Weather Outlook
National Weather Service Indianapolis IN
1020 PM EDT Fri Jun 26 2026

INZ021-028>031-035>049-051>057-060>065-067>072-280230-
Carroll-Warren-Tippecanoe-Clinton-Howard-Fountain-Montgomery-Boone-
Tipton-Hamilton-Madison-Delaware-Randolph-Vermillion-Parke-Putnam-
Hendricks-Marion-Hancock-Henry-Vigo-Clay-Owen-Morgan-Johnson-Shelby-
Rush-Sullivan-Greene-Monroe-Brown-Bartholomew-Decatur-Knox-Daviess-
Martin-Lawrence-Jackson-Jennings-
1020 PM EDT Fri Jun 26 2026

This hazardous weather outlook is for central Indiana.

.DAY ONE...Tonight.

Scattered showers and a few storms remain possible overnight, which
could produce heavy downpours and localized flooding.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

Isolated to scattered showers and thunderstorms are expected through
Saturday night. Heavy rainfall producing flooding will remain the
primary concern.

Afternoon heat indices will rise into the upper 90s on Sunday then
above 100 degrees for much of next week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated but any reports of flooding
through Saturday night would be appreciated.

&&

More information, along with other weather, hydrological and climate
information can be found at http://weather.gov/ind