How many letters does the top answer for “a strong wind, gale, or storm from the south.” have?

The most common answer is souther (7 letters).

Crossword clue: a strong wind, gale, or storm from the south.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

souther 7 letters web-def

a wind from the south