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 are more common in United States than in any other country. The United States receives more than 1,200 tornadoes annuallyâfour times the amount seen in Europe. Violent tornadoesâthose rated EF4 or EF5 on the Enhanced Fujita Scaleâoccur more often in the United States than in any other country. Most tornadoes in the United States occur east of the Rocky Mountains. The Great Plains, the Midwest, the Mississippi Valley and the southern United States are all areas that are ...