Flash Flooding in Indiana, June 9, 2026

Area Forecast Discussion
National Weather Service Louisville KY
1004 AM EDT Tue Jun 9 2026

.KEY MESSAGES...

* Unsettled weather with localized area of heavy rainfall and flash
  flooding are possible across KY and southern IN now through
  Wednesday morning. While basin average rainfall of 0.75-2 inches
  are expected, localized amounts of 3-6 inches will be possible in
  heavier swaths, mainly across central KY.

* Despite some morning showers and weak storms on Wednesday, hot
  temperatures and mugginess are expected Wednesday and Thursday,
  with peak afternoon heat index values between 90-100.

* An approaching cold front later in the week provide more
  opportunity for rain and some storms Thursday evening through
  Friday, though timing is still uncertain.

&&

.UPDATE...
Issued at 1004 AM EDT Tue Jun 9 2026

Early morning MCS continues to roll eastward into the Bluegrass
region.  This area has missed out on earlier rainfall so rainfall
amounts of 1-2 inches will be possible with this activity this
morning which could cause some minor issues here and there.

Next band of precipitation continues to move toward the I-65
corridor.  Heavy rainfall will likely slide east along and just
south of the I-64 corridor.  This will likely impact areas from the
Metro southward and eventually down into east-central KY and the
Bluegrass region.  After this band moves through, we may see a bit
of a break in the action as convection will likely become more
scattered in nature.

Have gone ahead and expanded the Flood Watch in area to include the
Bluegrass region of central KY and to extend the watch out through
Noon EDT Wednesday.  Early 12Z data suggests a break in the rainfall
this evening, but another MCS is likely to drop into the region
overnight.  Will be evaluating the 12Z data suite and the 12Z HREF
to better define convective expectations for the afternoon package.
However, given ongoing rain in the Bluegrass which will just prime
the soil, felt it was the best option to go ahead and expand the
watch rather than wait.

Will make some adjustments to the forecast grids and get a full
update of products out in the next hour.  Also, we'll be updating
our briefing packets with the latest data and a new packet will be
released in a little bit.

Updated 911 AM EDT Tue Jan 9 2026

Ongoing MCS continues to push into east-central KY this morning.
Widespread 1-1.5 inch rain amounts are occurring with this rainfall.
However, there are smaller streaks where intense rainfall has
produced rainfall values of 4-5 inches.

Low-level jet appears to be driving the next round of convection
that is oriented from NW-SE across portions of Breckinridge
southeast into Hardin/LaRue/Green/Taylor counties.  This activity
will pivot eastward, but the storms here are moving at 20-25 mph, so
the residence time of heavy rain at any one location may be a bit
more limited that what we've seen this morning.  We do have some
tall/skinny CAPE profiles in the morning proximity soundings.  With
MLCAPE around 1000 J/kg or less and shear through the column remains
below 20kts.  PWAT values are solidly in the 2-2.1 inch category and
freezing heights are up near 13-14kft. So, the overall threat here
will be storms with very efficient rainfall and localized flash
flooding.

Secondary band of convection out north of Evansville will continue
to slide southeast this morning.  This may clip the southern end of
the Louisville metro area, with the bulk of it going through north-
central Kentucky.  Once this passes, a break in the action looks
possible through the late afternoon and evening before the next wave
of precipitation arrives.

&&

.SHORT TERM /THROUGH WEDNESDAY/...
Issued at 401 AM EDT Tue Jun 9 2026

A complex of showers and storms continues overnight along our
western CWA gradually moving NE. Though daytime heating has waned,
there is plenty of moisture in the vertical throughout our CWA,
which has produced some torrential downpours along our western
border counties. Some of these areas have already picked up 1-1.5"
of rain in the past few hours and will continue to see on and off
moderate rain showers through the morning. This type of periods of
heavy rain will be the theme for the short term, at least through
Wednesday morning. The synoptic setup features very weak low to mid
level flow over the next 24 hours. As a result, as waves of rain and
storms roll through, localized heavier rainfall totals creating
flooding concerns will continue through this afternoon and into
overnight Wednesday. The current rounds of rain was part of a series
of shortwaves moving through the Plains, and as the first of a
couple moves off to our north, it leaves behind moisture-rich air,
high dewpoints and warm temperatures for the morning. Another
shortwave moving NE through the central plains will maintain surface
SW flow for the remainder of Tuesday - Wednesday.

From general lift induced by the central plains shortwave,
additional rounds of MCVs will move in along an axis of enhanced
PWATs oriented along a NW-SE line from roughly the Kansas City area
towards Richmond, KY. The initial MCV moving SE from Kansas City
will generally break up as it approaches, though rainfall rates will
remain high within embedded storms from what will likely become a
messy scattered complex of convection. Short range model guidance
has a general drying trend later in the evening on Tuesday, before
more storms and/or additional MCVs fire off again within a pool of
increased PWATs that will linger right over KY overnight through
Wednesday morning.

This general pool of increased stationary PWATs of 1.8-2.0"
lingering through the overnight is the cause of greatest concern for
flooding. Latest 00Z HREF guidance suggests a series of back-
building and training storms over far southern IN moving SE through
the heart of KY towards the Somerset-Richmond, KY area. HREF 6hr
LPMM data through overnight Wednesday features some areas of
receiving 4-6". Other signals of significant rainfall within short
bursts of time exist in HREF guidance, with 3hr QPF probability of
exceeding 1" is above 50% early Wednesday morning, with a 10%
hatched area of exceeding 3" in 3hr QPF. Altogether, there is a
strong signal of localized flooding, mainly through central KY going
through a lull of flooding probability Tuesday afternoon and
increasing in action from training storms overnight Tuesday into
Wednesday. As a result, the current Flood Watch will be extended
through 12Z Wednesday morning, and will be monitored for any further
expansion or time extensions.

With regard to any severe risk, as storms approach from the WNW,
there may be enough mid-level shear to sustain a severe wind threat
over our western CWA. The severe risk is low and is only for gusty
winds and this will be monitored throughout the day. The main
concern is for localized flooding concerns that ramp up later in the
night on Tuesday. Area wide rainfall totals through Wednesday
morning should range 0.75 - 2", though localized areas of 3-6" are
still possible in training storms in central KY.

Despite the rounds of rain today, muggy conditions with dew points
in the low to mid 70s will make the air feel thick and oppressive
between showers. Highs will be in the low to mid 80s with breaks in
cloud cover later on Tuesday.

By Wednesday morning, the main concern will be continued training
showers and storms. Surface moisture will remain high giving plenty
of moisture for storms to work with despite the lack of daytime
heating. As the day progresses, an axis of high pressure to our SW
will build into the lower Ohio Valley, expected to act as a lid for
any continued convection and generally sweep storms out towards the
east by lunchtime. Latest HREF guidance wants to slow this process
down with continued convection. For now, we are forecasted skies to
gradually clear SW to NE during the day. Without a significant
change in air masses though, dew points will remain high in the low
to mid 70s. A heat advisory may need to be issued for Wednesday as
highs will reach the low 90s by afternoon, with heat indices maxing
out in the low 100s at times.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
Issued at 401 AM EDT Tue Jun 9 2026

      Wednesday - Sunday ...

Heading into Thursday, the surface to mid level ridge will remain
overhead locking in hot temperatures and high dew points. Heat
indices will raise into the upper 90s and isolated low 100s again,
meaning another heat advisory may be needed. One note of difference
is a building LLJ from the SW in response to a tightening pressure
gradient on Thursday. A larger mid to upper level trough will be
swinging through the Northern Plains meaning gusty winds on Thursday
afternoon from daytime mixing is possible, gusting 20-25 MPH. This
could serve as a way to cool off during the day if nothing else.

This trough over the northern plains will kick off a trailing cold
front that should sweep through the Ohio Valley. The timing of this
cold front is key to any severe weather potential Thursday evening-
Friday morning. Current trend is to sweep through during the
overnight limiting the severe potential and serving as another rain
chance with some gusty winds. Beyond this, relief from the heat at
least temporarily is expected. Temperatures will remain near or just
above normal as a return of warm moist air looks to return beyond
Saturday.

&&

.AVIATION /12Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 714 AM EDT Tue Jun 9 2026

VFR to MVFR conditions will continue through the morning hours with
storms rolling through KY airports over the next several hours.
Southerly flow will slowly shift out of the southwest this afternoon
gusting near 20kts. Beyond this initial round of storms this
morning, spotty storms are possible in the afternoon. More
widespread coverage of storms returns later this evening from the NW
that will linger overnight into Wednesday morning. Prolonged rounds
of storms and rain are possible at times Tuesday evening temporarily
dropping ceilings to MVFR conditions. Otherwise, passing -SHRA with
winds becoming lighter overnight is expected with VFR-MVFR
conditions remaining Wednesday morning.

&&

.LMK WATCHES/WARNINGS/ADVISORIES...
KY...Flood Watch through Wednesday morning for KYZ023>043-045>049-
     053>057-061>067-070>078-081-082.
IN...Flood Watch through Wednesday morning for INZ076>079-083-084-
     089>092.

&&

UPDATE.......MJ
SHORT TERM...BKF
LONG TERM....BKF
AVIATION.....BKF

Preliminary Local Storm Report
National Weather Service Louisville KY
921 AM EDT Tue Jun 9 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0900 AM     Flood            3 E Rineyville          37.75N 85.91W
06/09/2026                   Hardin             KY   Public

            Neighborhood flooding on Boone Rd off of
            South Wilson Rd.

&&

CAL

Preliminary Local Storm Report
National Weather Service Louisville KY
927 AM EDT Tue Jun 9 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0818 AM     Rain             Liberty                 37.32N 84.93W
06/09/2026  M4.21 Inch       Casey              KY   Public

            Personal Weather Station, KKYLIBER6, Weather
            Underground station name 22-5-08 Casey
            County Primary Care. Hardware is Ambient
            Weather WS-140-IP.

&&

CG

Special Weather Statement
National Weather Service Louisville KY
927 AM EDT Tue Jun 9 2026

INZ083-084-089-090-KYZ025-091415-
Crawford IN-Perry IN-Dubois IN-Harrison IN-Meade KY-
927 AM EDT Tue Jun 9 2026

...STRONG THUNDERSTORMS WILL IMPACT NORTHWESTERN HARRISON...
SOUTHEASTERN DUBOIS...CRAWFORD...PERRY AND NORTHWESTERN MEADE
COUNTIES THROUGH 1015 AM EDT/915 AM CDT/...

At 927 AM EDT/827 AM CDT/, Doppler radar was tracking strong
thunderstorms along a line extending from 11 miles west of English to
near Santa Claus. Movement was east at 25 mph.

HAZARD...Wind gusts up to 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
English, Carefree Town, Mount Pleasant, Ferdinand, Marengo, Milltown,
Leopold, Birdseye, Troy, and Leavenworth.

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 3840 8669 3838 8609 3797 8661 3799 8679
      3800 8681 3802 8680 3800 8677 3803 8678
      3803 8677 3804 8679 3806 8677 3808 8678
      3810 8677 3812 8681 3812 8680 3815 8681
      3821 8679 3820 8689
TIME...MOT...LOC 1327Z 267DEG 23KT 3835 8667 3808 8696

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

AMS

Preliminary Local Storm Report
National Weather Service Louisville KY
930 AM EDT Tue Jun 9 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0837 AM     Rain             5 ENE Allendale         37.41N 85.50W
06/09/2026  M4.45 Inch       Taylor             KY   Public

            Personal Weather Station, Davis Weatherlink.

&&

CG

Preliminary Local Storm Report
National Weather Service Louisville KY
1002 AM EDT Tue Jun 9 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0821 AM     Flash Flood      4 SSE Summersville      37.27N 85.59W
06/09/2026                   Green              KY   911 Call Center

            Flash flooding reported at the intersection
            of KY Hwy 88 and KY 1464.

&&

CAL

Preliminary Local Storm Report
National Weather Service Louisville KY
1004 AM EDT Tue Jun 9 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0820 AM     Flash Flood      3 NNE Pierce            37.23N 85.60W
06/09/2026                   Green              KY   911 Call Center

            Flash flooding reported on Grab Rd.

&&

CAL