IMD forecasts heavy rain and thunderstorms across eight major states including UP, Rajasthan, and Delhi.
Southwest monsoon expected to advance significantly into Bihar, Jharkhand, and Chhattisgarh by June 23.
Heatwave conditions to persist in parts of Bihar until June 22 before monsoon arrival.
Strong wind alerts issued for Uttarakhand and Jammu & Kashmir with gusts up to 60 km/h.