Learn German: Warum jagen Sie bedrohliche Stürme? - Why do you chase threatening storms?

It follows the rules for strong adjective declension. Because there is no article (like die or keine) before the noun, the adjective has to step up and show the grammatical case and gender. Stürme is plural and in the accusative case here (it is the direct object being chased), so the adjective takes the -e ending.

How is the word bedrohliche built, and what are its related root words?

At B2, recognizing word families is an excellent way to expand your vocabulary. The root verb is drohen (to threaten), which becomes the noun die Drohung (the threat). Adding the prefix be- gives us bedrohen (to threaten someone or something directly). Finally, adding the suffix -lich turns it into the adjective bedrohlich (threatening).

Does the verb jagen always mean 'to hunt' in a traditional sense?

Not always! While jagen is the standard verb for a hunter hunting animals, it is also widely used for chasing things in a more intense or focused way. Just like in English, you can chase storms (Stürme jagen), hunt down criminals (Verbrecher jagen), or even chase your dreams (Träume jagen).