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.
About 90% of all tornadoes worldwide occur in the United States. More than half strike within a couple of hundred miles of Missouri and Arkansas. Tornadoes occur frequently in â¦ Missouri, Arkansas, Kansas, Oklahoma, Texas, Tennessee, and Mississippi.They are a bit less frequent in the northern plains states and Ohio Valley. Nearly every state in the USA has had tornadoes at some time.tornado alley) Why they occur is because: they get warm moist air from the gulf of Mexico that collides with cold â¦ dry air from Canada, and they get contained in this area by the mountain ranges that are on either side, when the air collides they swirl around each other causing a tornado. 2 people found this useful.