Tornadoes
My Blogs (olelog) are mainly based on my daily reading of earth science news. Here on whatonearth.olehnielsen.dk I try to weave some of the pieces together to a greater whole with added background info.

About 80 % of tornadoes in the world happen in the United States. They have however been observed on every continent except Antarctica. (Including my part of the world, where they are fortunately seldom). A Tornado is usually defined as a violently rotating column of air which is in contact with both the surface of the earth and a cloud.

[img tornado alley.gif centre]

The US tornadoes occur when cool Canadian air mixes with warm moist air coming from the Gulf of Mexico, and most of them in the so-called tornado alley (see map). April is, normally, the tornado season.

The south-eastern and Midwestern United States (or something like a quarter of the area of US) were hit by a record-breaking series of over 400 tornadoes within a ten-day period in May 2004. The damage ran into many millions of $, and 42 people died.

The Tornado Projectdiscloses The Terrific, Timeless and Sometimes Trivial Truths about Those Terrifying Twirling Twisters!

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