Chandigarh, Mohali, Panchkula are set for an active wet spell early next week as the IMD has warned of thunderstorms, lightning, gusty winds and heavy to very heavy rainfall across Punjab, Haryana, Chandigarh between October 5 and 7. The special weather bulletin flagged the possibility of hailstorms on October 5, 6 in Punjab and October 6 in Haryana.