We present the preliminary results in the multitemporal mapping of vegetal fuel in two large test areas in southern Italy, one stretching over the heterogeneous forests of northern Sicily, and one covering Mt. Vesuvius and the surrounding areas in the Campania region, Naples. We report on the preliminary results of project HYPERFUEL, started in 2022 and due to completion late in spring 2024. HYPERFUEL focuses on the exploitation of the hyperspectral payload HYC, onboard the LEO platform PRISMA operated by the Italian Space Agency, in combination with multispectral payloads onboard Sentinel-2A and-2B. It is aimed to providing forest planners and fire risk modelers with frequently updated vegetal fuel maps at the nominal scale 1/50,000.