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Tornado Stats Question


KokomoWX

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US Tornadoes has put out a map showing tornadoes by county for 1950 to 2011. It has 16 for Howard County. My records only show 14.

July 9, 1951

May 28, 1955

March 6, 1961

April 11, 1965

April 3, 1974

June 15, 1976

July 7, 1977

April 23, 1978

April 14, 1987

July 17, 1996

June 11, 1998

April 20, 2004

July 26, 2005

October 25, 2010

I cannot find the data to support the claim of 16. Any thoughts/help?

Edit: never mind, I forgot that two of the dates has two confirmed tornadoes.

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Thanks. I was just being forgetful this morning. 1961 and 2004 had two tornadoes on the same day. Thanks for the great work.

No problem! There have been errors, but it's within the data itself, SPC wasn't very good with checking their lat/long coordinates, so I have had to use County and State FIPS code to determine counts per county.

While I cannot double check each and every county, I try to check a random few with THP, who uses the same data.

Thanks for visiting the site!

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anyone have an explanation for the differences between Illinois and Missouri?

I can think of a few possible reasons. 1) visibility/terrain differences...lots of trees and hilly areas in Missouri which could impact the ability to see or even tornado formation itself in some cases, 2) population differences...no doubt Illinois has rural areas but Missouri is more rural, 3) something more meteorological? Perhaps more outbreaks tend to occur in the Plains and then "skip" over Missouri at night and refire farther east the next day.

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FYI: The Tornado Fatalities chart is actually US fatalities and not Indiana fatalities.

Thanks for catching that. I will try and get it fixed soon. You guys discovered my work in progress before I was ready to announce it. :-)

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  • 2 weeks later...

I can think of a few possible reasons. 1) visibility/terrain differences...lots of trees and hilly areas in Missouri which could impact the ability to see or even tornado formation itself in some cases, 2) population differences...no doubt Illinois has rural areas but Missouri is more rural, 3) something more meteorological? Perhaps more outbreaks tend to occur in the Plains and then "skip" over Missouri at night and refire farther east the next day.

I feel like there is definitely something to your last point. I have no data to back it up, but Missouri would suffer the same the same issues of say Iowa where convection fires over the sloped terrain of the Plains and diurnally weakens beyond the Missouri Valley. And that makes sense when you consider convective mode as well. Initiation and shortly thereafter would favor supercells, with the tendency to grow upscale into a linear system or multicell cluster with eastward extent, reducing the tornado potential.

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