Andrew, yes, but they are not always correct. I'm sure you've probably experienced it.
Are aircraft to be grounded when the crosswind is greater than the demonstrated maximum?
If a place is hotter than forecast when you arrive overhead, and outside the P chart temp, they say you cannot land. Must the PIC now declare an emergency? Or will we have to hold alternates for the temp being too hot? Nothing in the AIP about that under alternate requirements!