Flash Flood Warning 78, NWS Indianapolis, IN

225 
WGUS73 KIND 161122
FFSIND

Flash Flood Statement
National Weather Service Indianapolis IN
722 AM EDT Sun Aug 16 2026

INC139-161132-
/O.EXP.KIND.FF.W.0078.000000T0000Z-260816T1130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Rush IN-
722 AM EDT Sun Aug 16 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 730 AM EDT THIS MORNING FOR 
NORTHERN RUSH COUNTY...

Flooding is no longer expected to pose a threat. Please continue to 
heed remaining road closures.

A Flood Watch remains in effect until 1200 PM EDT for portions of 
central, east central, north central, and west central Indiana.

&&

LAT...LON 3963 8530 3962 8530 3960 8530 3958 8530
      3956 8530 3954 8530 3953 8530 3952 8530
      3950 8530 3948 8530 3969 8563 3978 8563
      3979 8535 3979 8530 3965 8530

$$

JP

Area Forecast Discussion
National Weather Service Indianapolis IN
128 AM EDT Sun Aug 16 2026

.KEY MESSAGES...

- Strong to severe storms with damaging winds, heavy rainfall, and
  flash flooding remain a significant threat through the weekend

- Heat index values in excess of 100 possible today and Sunday in
  southern portions of central Indiana

- Dry and milder weather early in the work week

- Additional storms possible Wednesday

&&

.FORECAST UPDATE...
Issued at 1019 PM EDT Sat Aug 15 2026

Only minor changes to the timing of Sunday's precipitation chances
with this update. A few isolated showers have persisted across
east- central Indiana this evening in the wake of a warm front.
To the west, water vapor imagery nicely shows a mid- level
shortwave trough axis shifting east out of Iowa into western
Illinois. Indeed, a cluster of storms has developed in the
vicinity of the attendant low. This system will provide the next
round of more widespread rain chances as it approaches the
forecast area by early morning. CAMs continue to vary in the
location of the heaviest rainfall, but given the abundant
moisture, increasing synoptic-scale lift, and a strengthening 850
mb jet, locally heavy rainfall will be possible--including over
areas that have already experienced flooding. The system
continues to look fairly progressive, however, which should limit
the time any stronger storm lingers over one location.

&&

.DISCUSSION (This evening through Saturday)...
Issued at 330 PM EDT Sat Aug 15 2026

Through 7PM:

Convection across the area has decreased significantly over the
course of the morning, with only a few isolated showers remaining
early this afternoon. Breaks in the cloudcover are evident on
visible satellite, which will allow for better destabilization of
the airmass as we head into the peak of daytime heating. Convective
inhibition has settled in across roughly the central third of the
state due to the extensive cold pool formed by this morning's
activity. We will continue to see little to no precipitation for
the remainder of the afternoon. Cloud breaks, a lull in
precipitation, and SSW flow will allow afternoon high temperatures
to reach the low 80s in the north and low 90s in the south. Heat
Index values will approach and could exceed 100 in the southern
portion of the area where precipitation and cloud cover has been
more minimal, and a Heat Advisory is in effect for this region
through tomorrow afternoon.

Flash Flood warnings currently in effect across central Indiana will
be coming to an end as the precipitation has ended for the time
being. They will be transitioned to areal Flood Warnings to reflect
the lingering flood threat brought on by the several-days long
stretch of rain the area has seen this week. A Flood Watch is still
in effect through Sunday morning (at this time - future evaluations
may necessitate its extension) from Vigo/Clay/Owen/Decatur counties
and north.

7PM to Midnight:

A warm front draped across the southern portion of the CWA is
expected to lift northward tonight, bringing a more unstable airmass
back into the area. Initially, this front is not expected to trigger
much precipitation. Most CAMs keep any development during this time
period north/east of the IND CWA (NE IN/NW OH) where more robust
shortwave energy and upper-level support will be moving through. The
most likely area to see isolated shower/storm activity would be the
N/NErn border (Carroll-Howard-Delaware-Randolph area).

Midnight through Sunday morning:

Unfortunately, the heavy rain threat continues Sunday morning, as a
low-level jet begins to ramp up across central Missouri and Illinois
and push into the west once again. The warm front that moves north
into the area Saturday night precedes a low that will be pushed
in from the west Sunday, bringing yet another round of lift
through an extremely unstable and incredibly moist warm sector.
More widespread rain looks to start moving in to the northwestern
portion of the area after midnight.

Sunday and Sunday Night:

Despite precipitation activity throughout the morning, instability
is expected to soar into the afternoon hours, and sufficient bulk
shear 30+ kts may allow for a few supercells. The primary convective
hazard with this activity would be damaging winds with any line
segments that may form as progressive outflow boundaries collide and
roll through the volatile environment. However, flooding remains the
biggest concern. This system should be decently progressive, but it
will track directly over the same areas already experiencing
saturated soils. It will take very little to result in more flooding
Sunday afternoon. Rain comes to an end Sunday evening.

The warm sector keeps things nice and toasty, with high temperatures
Sunday consistent with Saturday along with Heat Index values near
and exceeding 100 in the south once again.

Monday/Tuesday:

Rejoice! Surface and mid-level ridging will keep the shortwave
energy at bay for a day or two and turn off the atmospheric hose.
Temperatures also drop back closer to normal, with highs in the
upper 70s to mid-80s. Clouds will clear out and we will enjoy a
couple days of sunshine, as well as a light north wind.

Wednesday/Thursday:

Savor the dry time while you can, as upper-level northwest flow
strikes again on Wednesday. Long term models show many pockets of
shortwave energy preceding a deeper wave that sweeps across the
Plains later in the day. The SPC has not indicated a severe risk
this far in advance due to the low level of predictability at
such a lead time, however it is safe to say that a flooding risk
will definitely return as there will not be enough dry time to
counteract the extended period of rainfall we have seen this week.

Friday and Beyond:

Long term models are not indicating much of a change from this
troughing pattern through the weekend, though some weak surface high
pressure and perhaps brief mid-level inverted ridging may be enough
to interrupt the rain chances for at least the end of the weekend
headed into next week. As mentioned, the primary threat with any
activity for the immediate forecast period will be flooding with
additional rainfall.

&&

.AVIATION (06Z TAF Issuance)...
Issued at 128 AM EDT Sun Aug 16 2026

Impacts:

- Threat for showers and storms again at times through mid afternoon

- Patchy MVFR fog at some sites through daybreak

Discussion:

The continued presence of a very moist and humid airmass will
promote patchy MVFR fog through daybreak at one or more of the
outlying sites.

Additionally, isolated to widely scattered showers and storms are
developing near IND, and additional activity will likely move into
the area later this morning into the early to mid afternoon hours.
Will carry showers and PROB30 groups at each site during the most
favored time frame.

Winds will generally be light and variable to calm overnight,
becoming more westerly with time as high as 8-12KT.

&&

.IND WATCHES/WARNINGS/ADVISORIES...

Flood Watch until noon EDT today for INZ021-028>031-035>049-
051>057-065.

Heat Advisory until 8 PM EDT this evening for INZ060>063-067>071.

&&

UPDATE...Didio/WFO SGF
AVIATION...Nield
DISCUSSION...Nelson/WFO SGF

Hazardous Weather Outlook
National Weather Service Indianapolis IN
422 PM EDT Sat Aug 15 2026

INZ021-028>031-035>049-054>057-162030-
Carroll-Warren-Tippecanoe-Clinton-Howard-Fountain-Montgomery-Boone-
Tipton-Hamilton-Madison-Delaware-Randolph-Vermillion-Parke-Putnam-
Hendricks-Marion-Hancock-Henry-Morgan-Johnson-Shelby-Rush-
422 PM EDT Sat Aug 15 2026

This hazardous weather outlook is for central Indiana.

.DAY ONE...Tonight.

Major river flooding will continue along the White River from
Indianapolis upstream. Additional flooding will continue elsewhere in
central Indiana and a Flood Watch remains in effect for much of central
Indiana.

Thunderstorms are expected again tomorrow morning with a threat for
damaging winds and heavy rainfall. Any additional heavy rainfall will
likely quickly produce flash flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Thunderstorms will be possible at times through Sunday with
continued river flooding. Strong to severe storms will be possible
again on Sunday, and the flash flooding threat will remain elevated.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this weekend. Please report
incidents of flooding, large hail, or wind damage.

&&

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

INZ051>053-060>065-067>072-162030-
Vigo-Clay-Owen-Sullivan-Greene-Monroe-Brown-Bartholomew-Decatur-Knox-
Daviess-Martin-Lawrence-Jackson-Jennings-
422 PM EDT Sat Aug 15 2026

This hazardous weather outlook is for central Indiana.

.DAY ONE...Tonight.

Minor to Moderate river flooding will continue along the White and
East Fork White River. Additional river flooding will continue
elsewhere in south-central Indiana.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Thunderstorms will be possible at times through Monday morning along
with continued river flooding. Strong to severe storms will be
possible on Sunday, and the flash flooding threat will remain
elevated.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this weekend. Please report
incidents of flooding, large hail, or wind damage.

&&

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

Special Weather Statement
National Weather Service Indianapolis IN
115 AM EDT Sun Aug 16 2026

INZ039-040-047-048-160615-
Madison IN-Hancock IN-Hamilton IN-Marion IN-
115 AM EDT Sun Aug 16 2026

...A strong thunderstorm will impact portions of southern Madison,
northern Hancock, northeastern Marion and southeastern Hamilton
Counties through 215 AM EDT...

At 115 AM EDT, Doppler radar was tracking a strong thunderstorm over
Lawrence, or 9 miles northeast of Indianapolis, moving east at 35
mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Indianapolis, Anderson, Carmel, Fishers, Lawrence, Cumberland,
McCordsville, Pendleton, Fortville, Chesterfield, Ingalls, Meridian
Hills, Warren Park, Shirley, Markleville, Wilkinson, Williams Creek,
Castleton, Geist Reservoir, and Broad Ripple.

This includes the following highways...
 Interstate 69 between mile markers 200 and 230.
 Interstate 70 between mile markers 86 and 101.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3987 8560 3985 8560 3978 8610 3992 8617
      4013 8559 3987 8558
TIME...MOT...LOC 0515Z 249DEG 28KT 3989 8603

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Nield

Special Weather Statement
National Weather Service Indianapolis IN
156 AM EDT Sun Aug 16 2026

INZ048-049-057-160645-
Rush IN-Henry IN-Hancock IN-
156 AM EDT Sun Aug 16 2026

...Strong thunderstorms will impact portions of eastern Hancock, Rush
and Henry Counties through 245 AM EDT...

At 156 AM EDT, Doppler radar was tracking a cluster of strong
thunderstorms along a line extending from 9 miles northeast of
Greenfield to near Glenwood. Movement was east at 35 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
New Castle, Rushville, Knightstown, Carthage, Spiceland, Shirley,
Kennard, Wilkinson, Mooreland, Lewisville, Glenwood, Straughn,
Dunreith, Cadiz, Greensboro, Mays, and Arlington.

This includes Interstate 70 between mile markers 109 and 133.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3987 8522 3979 8522 3979 8530 3954 8530
      3957 8561 3966 8563 3970 8563 3970 8565
      3991 8571 4001 8521 4000 8520 3988 8520
TIME...MOT...LOC 0556Z 268DEG 29KT 3989 8564 3961 8537

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Nield