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We provide new conditions for the local existence of solutions to thetime-weighted parabolic equation $ u_t - \Delta u = h(t)f(u) \mbox{ in } \Omega\times (0,T),$ where $ \Omega $ is a arbitrary smooth domain, $f\inC(\mathbb{R})$, $h\in C([0,\infty))$ and $u(0)\in L^r(\Omega)$. As consequenceof our results, considering a suitable behavior of the non-negative initialdata, we obtain a second critical value $\rho^\star = 2r/(p-1),$ when$f(u)=u^p$ and $p> 1 + 2r/N$, which determines the existence (or not) of alocal solution $u \in L^\infty((0,T), L^r(\Omega)).$

on a second critical value for the local existence of solutions in lebesgue spaces