。
The wind is still blowing strongly.
Literal
Wind [subject-が] still strongly blows.
A simple present-tense weather observation. まだ 'still' marks the continuation of a prior state. 強く is the adverbial form of the い-adjective 強い 'strong,' modifying 吹く 'to blow.' The polite 吹きます is a present-tense statement, but in context describes an ongoing state — Japanese uses simple present for ongoing meteorological phenomena where English might use the progressive.