Dense fog has returned to northern India, significantly reducing visibility in Delhi-NCR, Haryana, Uttar Pradesh, and Rajasthan. Cold, dry north-westerly winds are maintaining cold conditions, though some marginal relief with slightly higher daytime temperatures is expected in eastern Uttar Pradesh, Bihar, Jharkhand, and Chhattisgarh. Meanwhile, southern India anticipates a shift with potential heavy rainfall in coastal Tamil Nadu and light showers in interior Tamil Nadu, Kerala, and south interior Karnataka.