You are in mid-latitudes in winter. You experience heavy snow followed by a dramatic drop in temperature as a cold front passes, but for almost 24 hours the weather is clear. Then, high clouds appear in the west, thicken to stratus clouds and you receive a light new snowfall (aka snow flurries) but the temperature remains cold. You have just seen the passage of .

an occluded front

Explanation:

You are in mid-latitudes in winter. You experience heavy snow followed by a dramatic drop in temperature as a cold front passes, but for almost 24 hours the weather is clear. Then, high clouds appear in the west, thicken to stratus clouds and you receive a light new snowfall (aka snow flurries) but the temperature remains cold. You have just seen the passage of occluded front, occluded front looks like a purple line with alternating triangles and semicircles pointing in the direction that the front is moving, It ends at a low pressure area shown with a large 'L' on the map, begins at the other end when cold and warm fronts connects.

heat released by collision processes during accretion, and heat from decay of radioactive elements

explanation: