Answer
(Fatwa: 720/426=H/1430)
He should leave salah as soon as the wind passes. If he can go back easily, he should perform wudhu again and offer salah anew. But, if it is difficult to go back, he should leave salah and sit quietly. Later, when he finds time, should go out, perform wudhu and salah again. He should not continue salah after passing the wind. There is one way of rejoining the salah, but it has some details, it is better for common people to perform salah again and if the imam is still in salah he should join the salah as masbooq and perform the remaining rak?ah after the salam of imam.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband