This is the 963rd most frequent Finnish word.
lounais
"Southwestern."
In this sentence, 'lounaasta' indicates the direction 'from the southwest', which derives from 'lounais'.
Tuuli puhalsi voimakkaasti lounaasta.
The wind blew strongly from the southwest.
Here, 'lounaisen' is a possessive form of the adjective 'lounais', describing the location in the southwest of Finland.
Lounaisen Suomen maisemat ovat kauniita.
The landscapes of southwestern Finland are beautiful.
In this usage, 'lounaista' describes the movement or journey towards the southwest direction.