Overview
Thunderstorms developed along a boundary across central Indiana during the evening of July 29. The storms brought 2 tornadoes, gusty winds, and heavy rain. Heavy rain brought flash flooding to parts of southern Shelby County and northern Bartholomew County.Tornadoes
Tornado - SE of Shelbyville
Track Map
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Tornado - 2 South Waldron
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 |
Storm Reports
PRELIMINARY LOCAL STORM REPORT NATIONAL WEATHER SERVICE INDIANAPOLIS IN ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0758 PM TORNADO 4 SE SHELBYVILLE 39.48N 85.73W 07/29/2021 SHELBY IN NWS STORM SURVEY NWS STORM SURVEY CONFIRMED AN EF-1 TORNADO WITH MAX WIND SPEED OF 90 MPH AND A PATH LENGTH OF 2.50 MILES. MAX WIDTH WAS 50 YARDS. 0814 PM TORNADO 2 S WALDRON 39.42N 85.67W 07/29/2021 SHELBY IN NWS STORM SURVEY NWS STORM SURVEY CONFIRMED AN EF1 TORNADO WITH MAX WIND SPEED OF 90 MPH AND A PATH LENGTH OF 0.71 MILES. THE MAX WIDTH WAS 50 YARDS. 1000 PM FLOOD GENEVA 39.39N 85.72W 07/29/2021 SHELBY IN LAW ENFORCEMENT FLOODED ROADS ARE BEING REPORTED IN NUMEROUS LOCATIONS, REQUIRING ROAD SIGNS AND PEOPLE TURNING AROUND TO FIND ANOTHER ROUTE. THE FOLLOWING LOCATIONS SPECIFICALLY HAVE THESE PROBLEMS...1100 S AND 300 E...1000 S AND 275 E...SR 9 AND SOUTH OF 252. WATER IS ON THE ROADWAY BUT NOT PRESENTLY DEEP AT 350 EAST SOUTH OF VANDALIA ROAD, AND 252 AND 25 W. 1100 PM FLASH FLOOD HOPE 39.30N 85.77W 07/29/2021 BARTHOLOMEW IN BROADCAST MEDIA ROAD FROM HOPE TOWN SQUARE TO THE SHELBY COUNTY LINE IS IMPASSABLE/WASHED OUT. AT LEASE ONE WATER RESCUE WAS PERFORMED.
Environment
Thunderstorms developed along a surface boundary in an unstable environment with high moisture content. The boundary aided in the tornado development.
Figure 1: Surface Map at 8:00 PM EDT | Figure 2: Mixed Layer CAPE at 8:00 PM EDT | Figure 3: Effective Storm Relative Helicity at 8:00 PM EDT |
Figure 4: 0-3km CAPE and Surface Vorticity at 8:00 PM EDT | Figure 5: Lifted Condensation Levels (LCL) at 8:00 PM EDT | Figure 6: Precipitable Water at 8:00 PM EDT |
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