اَللَّهُمَّ إِنِّي اَعُوذُبِكَ مِنْ شَرِّهَا

Allaahumma inni A‛oodhu bika min sarrihaa

O Allah! I seek refuge in Thee from its evil. Narrated Aisha (RA), she said, ‘If he saw clouds condensing on one of the horizons of the sky, the Messenger of Allah (ﷺ) would stop all work, even during Salat! Then he would say back to that- (The dua is mentaioned above)

Reference: Sahih. Abu Dawud: 5099