India Meteorological Department has said that north India is likely to witness an intense wet spell till tomorrow, with a fairly widespread precipitation accompanied with thunderstorm, lightning and hailstorm at isolated places. The national capital Delhi witnessed foggy morning with a thin layer of fog engulfing parts of the city, reducing the visibility.<br />'' <br />''Apart from Delhi, shallow to moderate fog in isolated pockets over Bihar, West Bengal and Sikkim, Jharkhand, Assam and Meghalaya and Mizoram and Tripura are also expected during the next two days, the IMD stated.<br />'' <br />''According to the Met department, an active western disturbance lies as a middle-and-upper-level cyclonic circulation over central Pakistan and neighbourhood, with its induced cyclonic circulation over southwest Rajasthan and neighbourhood at lower levels. After the wet spell, fresh northerly-northwesterly winds are likely to set in over plains of northwest India and severe cold wave conditions at isolated places over Punjab, Haryana and north Rajasthan are predicted from Thursday onwards.<br />