East Uttar Pradesh and Bihar reeled under cold day and cold wave conditions for almost three weeks now. Thick fog cover had also engulfed most regions of these states. It was due to the dense layer of fog that did not allow the maximums to rise.
Moreover, the cold and dry northwesterly winds were responsible for lowering the night temperatures thereby resulting in cold wave conditions for the last couple of days. The absence of rains and persistent dry weather also added to the drop in the temperature profile.
However, the last two days brought a sharp improvement in the weather across both Uttar Pradesh and Bihar. In the last two days, the northwesterly winds that were blowing over the region gained strength leading to thinning down of the fog cover at a few parts.