The India Meteorological Department (IMD) has forecast dense fog conditions at isolated pockets of Bihar, Odisha, Assam, Meghalaya, Nagaland, Manipur, Mizoram and Tripura tomorrow. According to the weather department Himachal Pradesh, Punjab, Haryana and Chandigarh are going to witness cold wave conditions tomorrow. The met department also said that a gradual fall in minimum temperatures by about 2 to 3 degrees celsius is expected over Northwest India during the next three days.