Why is it still thunder and lightning in northern Shandong?

Lightning is a discharge phenomenon in thunderstorm clouds, and the formation of thunderstorm clouds generally requires two conditions, sufficient water vapor and strong convection. In winter, because the air is cold and dry, the solar radiation is weak, and convection is not easy to form in the air, so lightning is rare. But in winter, sometimes the temperature is high and the warm and humid air flow is strong. When there is occasional strong cold air going south in the north, warm and humid air is forced to rise, and convection intensifies, forming thunderstorm clouds, producing lightning and rain and snow. Convection is particularly strong, and it can also form hail, which will produce the so-called "winter thunder" weather phenomenon.