The India Meteorological Department, IMD has forecast dense to very dense fog in Uttar Pradesh tomorrow. The weather agency has also predicted dense fog over Coastal Andhra Pradesh, Tamil Nadu, Puducherry, Karaikal and Uttarakhand for the day. Similar conditions will prevail over Bihar, Assam and Meghalaya. Rainfall or snowfall is expected over Himachal Pradesh and Uttarakhand for the next three days.