Hawaii has a robust emergency siren warning system. It sat silent during the deadly wildfires::Some Maui residents are questioning the effectiveness of the emergency warning system employed as the wildfires spread rapidly across Lahaina and other parts on Tuesday. Hawaii’s attorney general is leading a review of the emergency response.
Even Denmark has over 1000 sirens for warnings.
Maybe its considering the size of the landmass, Maui is about 1.5 times bigger than Lolland.