Ample instability and low-level vertical wind shear across central Indiana combined with a warm frontal boundary approaching from the south to produce several rotating, supercell thunderstorms.  These storms produced large hail within a two hour late day period over several of the region's southwestern to south-central counties
Soon after, a rotating cluster of thunderstorms crossed southern central Indiana during the evening and early morning hours.  This relative small, yet intense, complex of storms produced a long-track EF-1 tornado from Illinois into Gibson and Knox Counties in Indiana, as well as isolated, locally intense, damaging winds that were mainly in southeastern central Indiana.

Hail in KNOX, INDIANA
From 19-MAY-22 16:52:00 to 19-MAY-22 16:52:00 (EST-5)
Location: FRITCHTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DAVIESS, INDIANA
From 19-MAY-22 17:15:00 to 19-MAY-22 17:15:00 (EST-5)
Location: WASHINGTON
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm produced estimated 1.25 inch hail that was found along road after partially melting.

Thunderstorm Wind in HENDRICKS, INDIANA
From 19-MAY-22 22:40:00 to 19-MAY-22 22:40:00 (EST-5)
Location: HAZELWOOD
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm winds downed 15 to 20 trees at 9173 South County Road 100 West.

Hail in LAWRENCE, INDIANA
From 19-MAY-22 18:26:00 to 19-MAY-22 18:26:00 (EST-5)
Location: MITCHELL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in DECATUR, INDIANA
From 20-MAY-22 02:10:00 to 20-MAY-22 02:10:00 (EST-5)
Location: MILFORD
Magnitude: 52.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds snapped a utility pole about halfway up at West Base Road and North County Road 500 West.

Hail in KNOX, INDIANA
From 19-MAY-22 16:30:00 to 19-MAY-22 16:30:00 (EST-5)
Location: SANDBORN
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Photograph showing approximately 2.00 inch hail just north of Sandborn.

Hail in KNOX, INDIANA
From 19-MAY-22 16:40:00 to 19-MAY-22 16:40:00 (EST-5)
Location: VINCENNES
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm produced large hail in and near Vincennes, including estimated 1.50 inch hail at 1645 EST within the City of Vincennes.

Hail in MARTIN, INDIANA
From 19-MAY-22 17:41:00 to 19-MAY-22 17:41:00 (EST-5)
Location: BRAMBLE
Magnitude: 2.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in KNOX, INDIANA
From 19-MAY-22 22:00:00 to 19-MAY-22 22:00:00 (EST-5)
Location: ST THOMAS
Magnitude: 61.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew over a tractor-trailer on US Route 41 near the Fireman Road intersection.

Thunderstorm Wind in JACKSON, INDIANA
From 20-MAY-22 01:20:00 to 20-MAY-22 01:20:00 (EST-5)
Location: SEYMOUR
Magnitude: 74.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm straight-line winds caused significant damage at Kasting Park.  Baseball dugout had roof lifted off and cinder block wall knocked down.  Aluminum bleachers were blown into stadium's fence.  Only minor siding damage to onsite building.  Damage was all laid out to the north and northeast.

Tornado in KNOX, INDIANA
From 19-MAY-22 21:40:00 to 19-MAY-22 22:03:00 (EST-5)
Location: ORRVILLE
Tornado F-scale: EF1
Property damage: 200.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

Tornado crossed a county line 10 times in its 26.7-mile track from Illinois to Indiana, see below for lat/long/location/time details for each border crossing.
The tornado first entered the extreme southwestern corner of Knox County at 940 PM EST and proceeded to cause damage consistent with EF0/EF1 intensity:  snapping two hardwood trees that fell onto power lines on South 1300 West at 13.4 miles west, breaking large hardwood tree branches on South County Road 1300 West at 18.3 miles south, and leaning two utility poles on South 1200 West at 19.9 miles south.
The tornado's center track then crossed the Knox-Gibson county line 4 times over a 1.4-mile segment roughly midway between Mt. Carmel, IL and Hazleton, IN before re-entering Knox County to cause damage consistent with EF0 intensity during 944-949 PM EST:  breaking small hardwood tree limbs on South County Road 775 West at 18.6 miles south;  and then along the 17.8 South parallel, blowing over 5 irrigation sections at 8.7 miles west, before blowing over two more irrigation sections and blowing in a barn door and tree damage at 8.1 miles west;  and then breaking large hardwood tree branches along South County Road 775 West at both 17.0 miles south and 16.55 miles south.
The tornado track then entered the appendage of Gibson County west of Hazleton, IN for 0.5 miles before again re-entering Knox County to cause damage consistent with EF1 intensity at 952 PM EST:  leaning utility poles and snapping several tree branches on West County Road 1750 South just west of Old US Route 41.
The tornado track then entered Gibson County for the final time while transecting the appendage north of Hazleton, IN for 1.0 miles before re-entering Knox County for the final time to cause damage consistent with EF0/EF1 intensity at 954 PM EST in the town of Decker, IN:  uprooting large hardwood trees along Broadway Street near 3rd Street, with large hardwood branches snapped across southern and eastern portions of Decker.
The tornado continued to the northeast, next causing damage consistent with EF0/EF1 intensity during 955-959 PM EST:  snapping branches of various sizes from both softwood and hardwood trees along Indiana Route 241 and East County Road 1250 South to the west of Iona, IN;  as well as destroying an old barn on East 1250 South just east of South Decker Road by lifting the roof which allowed the walls to collapse.
The tornado's final observed damage was consistent with EF1 intensity during 1000-1003 PM EST :  snapping several softwood trees on South Hart Road just northwest of Upper River Deshee, and fully destroying a barn on Southeast County Road 200 East east of Upper River Deshee, scattering debris several hundred feet to the northeast.
Further data regarding every county/state border crossing.
ILLINOIS:  traveled 8.33 miles as EF0-EF2 before entering Gibson County Indiana.
INDIANA: traveled 18.36 miles as EF0-EF1: Gibson Co. (3.51 mi), Knox Co. (14.85 mi).
A, 38.410/-87.745, Mt. Carmel 1.1 ESE, 2139EST, Illinois to Indiana;
B, 38.417/-87.732, Mt. Carmel 1.8 E, 2140EST, Gibson to Knox;
C, 38.446/-87.674, Mt. Carmel 5.3 ENE, 2143EST, Knox to Gibson;
D, 38.448/-87.669, Mt. Carmel 5.6 ENE, 2143EST, Gibson to Knox;
E, 38.450/-87.664, Mt. Carmel 5.9 ENE, 2143EST, Knox to Gibson;
F, 38.455/-87.651, Mt. Carmel 6.7 ENE, 2144EST, Gibson to Knox;
G, 38.490/-87.586, Hazleton 2.3 W, 2150EST, Knox to Gibson;
H, 38.494/-87.577, Hazleton 1.9 W, 2150EST, Gibson to Knox;
I, 38.507/-87.546, Hazleton 1.2 N, 2152EST, Knox to Gibson;
J, 38.515/-87.530, Decker 0.4 SSW, 2153EST, Gibson to Knox;
K, 38.609/-87.400, Monroe City 2.5 WSW, 2203EST, End of track in Knox Co, IN.

Thunderstorm Wind in JENNINGS, INDIANA
From 20-MAY-22 01:39:00 to 20-MAY-22 01:39:00 (EST-5)
Location: NORTH VERNON
Magnitude: 56.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds downed numerous trees and utility lines on northeast side of North Vernon.  Trees fell mainly to the north and northeast.

Hail in DAVIESS, INDIANA
From 19-MAY-22 16:55:00 to 19-MAY-22 16:55:00 (EST-5)
Location: ELNORA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 446.00K
Reported by: Broadcast Media

Thunderstorm produced large hail that led to the loss of 200 acres of corn and soybeans, with 1000 acres stripped to stubs.  Fully headed wheat was also destroyed.