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.
The rising rainfall of spring may bring with it an increase in flooding as melting snow overwhelms rivers. Spring may also boast storms, as warm air from the equator combines with still-cool air farther north or south. Tornadoes are common during the spring in the United States as air of different temperatures combine. [Related: 6 Signs Spring Has Sprung ]. A time of celebration. Many cultures celebrate the return of spring, or the rise of the vernal equinox.