... what is "aqua alta"?
read the article
... and the picker will indicate temperatures even higher than 240 K (-33 C) ?
In wx. radar you have not a dBZ limit (that's good!).
Why you use the 240 K limit in the picker for infra satellite images?
For each layer, you can click on the clock in the low right corner. You get the information about the data including the provider, the update interval, the resolution and the last and the next update.
The Active fires layer is not the only one that is not in « real time »