The basic reason behind the fog in Delhi and other parts of northwest plains today is said to be single digit night temperature, slow winds and high humidity level. Western disturbance in Jammu & Kashmir has moved eastward but has also left a fair amount of moisture in the region to make conditions conducive for the formation of fog in Delhi and other areas.
According to the various reports with the approach of another Western disturbance which might help in decreasing fog in Delhi after 48 hours as south-easterly winds would lead to increase in minimum temperatures. Also a cloud cover over Delhi would reduce the intensity of the fog thereafter.
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