National Weather Service United States Department of Commerce
May 24, 2017
Tornado near Casstown / Piqua, OH

Note: In March 2018, the National Weather Service in Wilmington, Ohio conducted a re-analysis of the tornadoes that occurred on May 24, 2017. After review, it was determined that the path length, start time and beginning location of the Casstown/Piqua EF1 tornado needed to be revised. The changed information is listed directly below, and the tornado track map reflects the adjustments. The original Public Information Statement is also available below.

UPDATED INFORMATION
Location...5 miles southeast of Piqua in Miami County Ohio
Date...05/24/2017
Estimated Start Time...10:03 PM EDT 
Estimated End Time...10:10 PM EDT 
Maximum EF-Scale Rating...EF1 
Estimated Maximum Wind Speed...90 MPH
Maximum Path Width...160 Yards
Path Length...1.9 Miles
Beginning Lat/Lon...40.0788N / 84.1539W 
Ending lat/Lon...40.1023N / 84.1728W
* Fatalities...0
* Injuries...0

Based on radar data, video evidence and eyewitness reports, the
tornado is estimated to have touched down in a field north of
the intersection of Polecat Road and Troy Urbana Road.
 
ORIGINAL STATEMENT
Public Information Statement
National Weather Service Wilmington OH
734 PM EDT Thu May 25 2017

...EF1 TORNADO CONFIRMED NEAR 5 MILES SOUTHEAST OF PIQUA IN MIAMI
COUNTY OHIO...

Location...5 miles southeast of Piqua in Miami County Ohio
Date...05/24/2017
Estimated Start Time...10:09 PM EDT 
Estimated End Time...10:10 PM EDT 
Maximum EF-Scale Rating...EF1 
Estimated Maximum Wind Speed...90 MPH
Maximum Path Width...160 Yards
Path Length...0.35 Miles
Beginning Lat/Lon...40.0976N/84.1708W 
Ending lat/Lon...40.1023N/84.1728W
* Fatalities...0
* Injuries...0

* The information in this statement is preliminary and subject to
change pending final review of the event(s) and publication in
NWS Storm Data.

...Summary...
The National Weather Service in Wilmington OH has confirmed a 
tornado near 5 miles southeast of Piqua in Miami County Ohio 
on 05/24/2017.

The information below is updated from an earlier issuance at 344 PM 
EDT today.

The tornado touched down along Deweese Road approximately one-half 
mile north of the intersection with East Rusk Road. Tree branches 
generally 4 inches in diameter or smaller were broken immediately 
west of Deweese Road at the start of the tornado track. More 
signicant damage occurred less than one-tenth of a mile north where 
several maple trees up to 18 inches in diamater were snapped. This 
is where the tornado was believed to be at peak intensity with winds 
estimated near 90 mph. There was also a large barn immediately east 
that was moved several inches off its foundation. This movement was 
likely caused by winds approaching 90 mph while flowing into the 
circulation. The tornado then started to weaken as it moved north-
northwest near Deweese Road to a point approximately two-tenths of a 
mile southwest of the intersection with East Peterson Rd. Tree 
damage was generally less significant in this area with estimated 
wind speeds of 60-75 mph. The tornado appears to have lifted at this 
point, and no further damage was observed farther northwest. Damage 
along this path was oriented in convergent and semi-circular 
patterns consistent with the presence of a tornado.

The National Weather Service would like to thank the Miami County 
Emergency Management Agency, the State of Ohio Emergency Management 
Agency and the affected property owners for their assistance during 
this survey.

For reference: the Enhanced Fujita Scale classifies tornadoes
into the following categories:

EF0...wind speeds 65 to 85 mph.
EF1...wind speeds 86 to 110 mph.
EF2...wind speeds 111 to 135 mph.
EF3...wind speeds 136 to 165 mph.
EF4...wind speeds 166 to 200 mph.
EF5...wind speeds greater than 200 mph.

$$

SHOBE2


 
 
 

Radar Loops from NWS Wilmington Ohio (9:58 PM - 10:15 PM)
KILN 0.5° Reflectivity KILN 0.5° Velocity KILN 0.5° Correlation Coefficient (raw)
1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12

Radar Loops from the Dayton Terminal Doppler Radar (9:54 PM - 10:15 PM)
note: TDAY radar data was unavailable between 10:07 PM and 10:12 PM
TDAY 0.3° Reflectivity TDAY 0.3° Velocity
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18
TDAY 1.0° Reflectivity TDAY 1.0° Velocity
1 2 3 4 1 2 3 4
TDAY 2.4° Reflectivity TDAY 2.4° Velocity
1 2 3 4 5 6 7 1 2 3 4 5 6 7
TDAY 4.9° Reflectivity TDAY 4.9° Velocity
1 2 3 1 2 3
TDAY 7.4° Reflectivity TDAY 7.4° Velocity
1 2 3 1 2 3
TDAY 10.8° Reflectivity TDAY 10.8° Velocity
1 2 3 1 2 3
TDAY 14.5° Reflectivity TDAY 14.5° Velocity
1 2 3 1 2 3