I was was watching Sally now the National Hurricane Center has the wind at a CAT 2 and this app has it at 72 mph. It does seem this app gives accurate info. Maybe it is operator error? Can someone explain to me why the difference?

Thank you

I was was watching Sally now the National Hurricane Center has the wind at a CAT 2 and this app has it at 72 mph. It does seem this app gives accurate info. Maybe it is operator error? Can someone explain to me why the difference?

Thank you