Past analysis maps

hey y'all! i was wondering if anyone knew how to access past analysis maps from somewhere like pivotal weather or tropical tidbits? there's only the option of going back a few days but i want to see some vorticity and jet stream maps from 3 weeks ago! Doesn't have to be those sites if you know of any that do go further back. Also sorry if this has already been asked before, I'm new to reddit :) Thanks for any help!!!