The wind$-$chill index is modeled by the function

$W=13\mathrm{.}12+0\mathrm{.}6215T-11\mathrm{.}37v^{0\mathrm{.}16}+0\mathrm{.}3965T{v}^{0\mathrm{.}16}$ two decimal places.$)$

$C$ drop

What if the wind speed increases by $1k\frac{m}{h}$ while the actual temperature stays constant at $T=-19C?$

$$ C drop