Overview
Thunderstorms developed along and north of a warm front and along with an upper disturbance during the evening of May 19 and early morning of May 20. The initial round of storms brought large hail, while the later storms brought damaging winds and a tornado that moved into Knox County from Illinois.Tornado
Tornado - Near Monroe City
Track Map
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The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
Radar
Early Evening Storms
Radar Loop of May 19 Evening |
Late Evening and Early Morning Storms
Radar at 11 PM EDT May 19 | Radar at 2:20 AM EDT May 20 |
Storm Reports
Below are reports received by NWS Indianapolis.
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0530 PM Hail 1 N Sandborn 38.90N 87.19W 05/19/2022 E2.00 inch Knox IN Public Report with a picture showing around 2 inch hail just north of Sandborn, IN. 0540 PM Hail Vincennes 38.68N 87.51W 05/19/2022 E1.00 inch Knox IN Emergency Mngr 0545 PM Hail 1 WSW Vincennes 38.67N 87.52W 05/19/2022 E1.50 inch Knox IN Public 0552 PM Hail 4 E Vincennes 38.69N 87.37W 05/19/2022 E1.00 inch Knox IN Trained Spotter 0615 PM Hail 2 NNE Washington 38.68N 87.17W 05/19/2022 M1.25 inch Daviess IN Broadcast Media 1.27 inch hail found along the road after a bit of melting. 0641 PM Hail 1 ENE West Boggs Lake 38.73N 86.92W 05/19/2022 E2.00 inch Martin IN Public 0641 PM Hail 1 E West Boggs Lake 38.73N 86.91W 05/19/2022 E2.75 inch Martin IN Public 0726 PM Hail Mitchell 38.73N 86.47W 05/19/2022 E2.00 inch Lawrence IN Broadcast Media Picture received via social media of 2 inch hail. Time estimated from radar. 0726 PM Hail Mitchell 38.73N 86.47W 05/19/2022 E1.75 inch Lawrence IN Public 1054 PM TORNADO DECKER 38.52N 87.53W 05/19/2022 KNOX IN NWS STORM SURVEY DELAYED REPORT. NWS SURVEY FOUND EF2 TORNADO DAMAGE ALONG A 26 MILE PATH FROM ILLINOIS INTO INDIANA. MAX ESTIMATED WIND SPEEDS WITH THE TORNADO WERE 115 MPH. DAMAGE IN KNOX COUNTY INDIANA WAS ONLY EF1 WITH THE MOST SEVERE DAMAGE IN DECKER. 1100 PM Tstm Wnd Dmg Decker 38.52N 87.53W 05/19/2022 Knox IN Emergency Mngr Trees and utility lines down in and around the Decker area. 1100 PM Tstm Wnd Dmg 3 NNW Decker 38.56N 87.54W 05/19/2022 Knox IN Emergency Mngr Semi truck blown over on US 41. 1100 PM Tstm Wnd Dmg 3 NNW Decker 38.56N 87.54W 05/19/2022 Knox IN Emergency Mngr Semi truck blown over on US 41 near Firemen Rd. 1140 PM Tstm Wnd Dmg 4 SSW Clayton 39.63N 86.54W 05/19/2022 Hendricks IN Public 15-20 Trees Blown Down. 9173 South County Rd 100 West. Time estimated. 0220 AM Tstm Wnd Dmg 1 SW Seymour 38.95N 85.90W 05/20/2022 Jackson IN Emergency Mngr Baseball dugout had significant damage with roof lifted off and cinder block wall knocked down. Aluminum bleachers were blown into fence of baseball field. Building onsite only had minor siding damage. Damage all laid out to north and northeast along storm track path. 0239 AM Tstm Wnd Dmg 1 NE North Vernon 39.02N 85.62W 05/20/2022 Jennings IN Emergency Mngr Numerous trees and utility lines down on northeast side of North Vernon. Tree fall direction mainly to the north and northeast. 0310 AM Tstm Wnd Dmg 3 ESE Milford 39.34N 85.57W 05/20/2022 Decatur IN Emergency Mngr Late report of a pole snapped about half way up at West Base Road and North County Road 500 West. Time estimated from radar. && $$
Environment
Thunderstorms developed along a surface warm front..
Figure 1: MSLP at 5 PM EDT | Figure 2: Mixed Layer CAPE at 5 PM EDT | Figure 3: Significant Hail Parameter at 6 PM EDT |
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