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Tornadoes Numbers Remain At Near Record Lows Through September

October 6, 2013

By Paul Homewood

 

US tornadoes continue to run at close to record low levels, with September numbers again well below average.

Preliminary tornado data is based on Local Storm Reports, or LSR’s. It takes about three months to confirm this preliminary data, categorise it on the Fujita scale, and eliminate duplicate reports. Consequently, we still only have confirmed numbers up to May.

Comparison of LSR’s, however, suggests that tornadoes are running at about 55% of the 2005-11 average, and the lowest of any year during this period.

 

 

ptorngraph

 

 

torngraph

 

 

The two years with least F1+ tornadoes, since 1970, were 1987 & 2002, with 316 and 311 tornadoes respectively. On current trends, this year is likely to come very close to these years.

6 Comments
  1. October 6, 2013 11:16 pm

    Warmth reduces tornadoes. Cold increases them.

    • kuhnkat permalink
      October 13, 2013 7:13 pm

      1987 and 2002 were not cold years…

  2. Jim Pettit permalink
    October 9, 2013 11:45 am

    Some people understand that the term “extreme” applies to both ends of any particular scale. For instance, floods are from precipitation on one extreme end of the scale, while; droughts are from precipitation on the extreme end of the scale. So it is with tornado activity. A record-setting year for tornadoes doesn’t just mean the most twisters formed; records for least activity are every bit as extreme.

  3. October 12, 2013 6:42 pm

    I think Mr. Pettit’s reasoning suffers from
    a logical fallacy. I will let the readers
    determine whichl.
    HL Mencken

  4. October 13, 2013 5:33 am

    An extreme lack of tornadoes!

  5. Billy Liar permalink
    October 13, 2013 10:47 am

    On the cards – an extreme lack of Atlantic basin hurricanes.

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