colorectal. pertaining to or of the nature of the colon and the rectum. colorectal polyp. benign or malignant; most commonly occurs at the anorectal junction in middle-aged dogs, causing diarrhea, dyschezia and rectal bleeding.
Although favorable conditions for tornadoes in the United States can occur at any time, they are most common in spring and least common in winter. Because spring is a transitional period for the climate, there are more chances of cooler air meeting with warmer air, resulting in more thunderstorms.
Tornadoes can form in any situation that produces severe weather. Tornadoes most commonly develop in thick cumulonimbus clouds (the same clouds that develop thunderstorms), Tornadoes are most likely to occur when thunderstorms are likely, in spring and early summer, often late in the afternoon when the ground is warm.