decaying proportionally to $r^{-\alpha}$ (i.e., $v\propto r^{-\alpha}$). These results are summarized in Table \[tab:alpha\].

               Tornadic storm                 Value of $\alpha$
  ---------------------------------------- -----------------------
      F2–F4, Dimmit, TX, June 2, 1995            $0.5$-$0.7$
       F4, Spencer, SC, May 30, 1998            $\approx0.67$
        F4, Mulhall, OK, May 3, 1999             $0.5$-$0.6$
   F0–F4, Harper County, KS, May 12, 2004   $0.26\rightarrow0.61$

  : Summary of values of the power law exponents $\alpha$ in $v\propto r^{-\alpha}$ for various tornadic storms mentioned in the text.[]{data-label="tab:alpha"}

The results of the analysis of data collected from an F2–F4 tornado that occurred in Dimmit, Texas on June 2, 1995 indicate that the exponent $\alpha$ was in the range $0.5$ to $0.7$ [@wurmangill00]. The results of the analysis of data collected from an F4 tornado that occurred in Spencer, South Dakota on May 30, 1998 indicate that the exponent $\alpha\approx0.67$ provides the best fit for the collected data [@wurmanalexander05]. The measurements together with the fitted modified Rankine vortex model are shown in Figure \[fig:wurman-alexander-decay\].

![A profile of measured tangential winds (red) together with a fitted modified Rankine vortex model (blue) in a tornado that occurred in Spencer, SD on May 30, 1998. © AMS [@wurmanalexander05].[]{data-label="fig:wurman-alexander-decay"}](wurman-alexander-decay){width="\textwidth"}

The results of the analysis of data collected from an F4 tornado that 