Generally speaking, in the U.S., the west coast of Florida has the highest occurrence of tornadoes in the USA. But this includes all tornadoes; violent, strong and weak. The strongest tornadoes, and those that kill the most people, strike most frequently in the nation's midsection, in and near an area referred to as "Tornado Alley." A USA TODAY graphic shows where tornadoes strike most and text explains why. Links take you to information about Tornado Alley and why the West has so few twisters.

In 2007, there are approximately 2 million people with limb loss in the United States (excluding fingers and toes). There are more than 185,000 new amputations preformed each year in this country. The prevalence rate in 1996 was 4.9 per 1,000 persons. The incidence rate was 46.2 per 100,000 persons with dysvascular disease, 5.86 per 100,000 persons secondary to trauma, 0.35 per 100,000 secondary to malignancy of a bone or joint. The birth prevalence of congenital limb deficiency in 1996 was 25. See similar questions...

Of the 1000 tornadoes that occur each year, about 2% of them are rated F4 or F5. That means that there are as many as 20 devastating tornadoes each year. It is possible that meteorologists have underestimated the number of violent tornadoes that occur each year. Tornadoes are rated only by damage they do to man-made structures. Therefore, if a tornado doesn't hit a structure of some kind, we cannot estimate its strength. See similar questions...

There is no particular temperature at which tornadoes form. It is more about what the surface temperature is in relation to the temperature higher up in the atmosphere. Even if it is cold near the surface, as long as it is colder higher up, the winds are right to set up low-level wind shear, along with other necessary ingredients, a tornado is possible. See similar questions...

Yes, but the U.S. has more tornadoes and stronger tornadoes than any other nation. The only Web source we've found with information about tornadoes outside the U.S. is the British Tornado and Storm Research Organisation site. It has links to information about tornadoes not only in the United Kingdom, but also other parts of the world. Click here to go to this site. See similar questions...

Tornadoes can develop at any time of the year. The most tornadoes occur in April, May and June. Tornadoes are most likely to appear between 3 p.m. and 9 p.m. but they can occur at all hours of the day or night. See similar questions...

For the U.S., May averages the most tornadoes, but over the years, April has had more deadly twisters. But they can happen just about any time of the year. Tornadoes are likely in the Southeastern states in the late winter and early spring. By mid-April they are more likely to occur on the southern and central Plains and on the northern Plains later in the spring and early summer. See similar questions...

UTIs are more common in hotter months because we tend to be outdoors and more active. Perspiration and fluid loss lead to more concentrated urine, which creates the perfect environment for bacteria to thrive and develop a UTI. See similar questions...

There are about 6 million people in the United States who are coping with infertility problems. It is estimated that about 1/3 of the time infertility is due to a condition in the woman, 1/3 of the time to a condition in the man, and 1/3 of the time infertility is due to unexplained or unusual problems that may be present in both partners. See similar questions...

Varicose veins are most commonly found on the legs of women and men who spend a lot of time on their feet. Birth control pills, hormone therapy, obesity, weight fluctuation, and constipation can also add to the development of varicose veins. See similar questions...

Cosmic rays in general are more concentrated near the Earth's magnetic poles and less concentrated near the magnetic equator. This is because most cosmic rays are electrically charged particles, and they are funnelled towards the poles by interactions with Earth's magnetic field. Cosmic rays also fall more densely at higher altitudes, since higher altitudes have less atmospheric shielding between them and space. See similar questions...

Several thousand meteors of fireball magnitude occur in the Earth's atmosphere each day. The vast majority of these, however, occur over the oceans and uninhabited regions, and a good many are masked by daylight. Those that occur at night also stand little chance of being detected due to the relatively low numbers of persons out to notice them. Additionally, the brighter the fireball, the more rare is the event. See similar questions...

Our best estimates of the total incoming meteoroid flux indicate that about 10 to 50 meteorite dropping events occur over the earth each day. It should be remembered, however, that 2/3 of these events will occur over ocean, while another 1/4 or so will occur over very uninhabited land areas, leaving only about 2 to 12 events each day with the potential for discovery by people. Half of these again occur on the night side of the earth, with even less chance of being noticed. See similar questions...

Under the law, elder abuse can occur in any setting. Most cases arise out of nursing homes which are understaffed, and the staff that exists is poorly trained. See similar questions...

It is estimated that in the developing world, the number of babies born with this deformity is one in 500-600. This means that, assuming 15,000 children are born per hour worldwide?, a child is born with a cleft somewhere in the world approximately every 2 ? minutes.? More than 70% of babies with a cleft lip also have a cleft palate. Males are affected more frequently than females. See similar questions...

Women who conceive after tubal ligation have an increased risk of tubal pregnancy because of tubal distortion resulting from the procedure. Ectopic pregnancies are usually secondary to utero-peritoneal fistula after unipolar electrocoagulation, inadequate coagulation or recanalization after bipolar procedures, or recanalization or fistula formation after Pomeroy, tubal ring or clip procedures. See similar questions...