Tornados


Anglų rašinys. Tornado Terror. How and Why. Fujita Scale. Prediction and Safety. Tornado Alley. Predictions. There is simply no natural phenomenon more terrifying than a tornado. ‘Twisters’ as they’ve become known, appear almost without warning at any time day or night. They can also occur any month during the year providing the conditions are right. Around 1,000 tornadoes touch down in the United States of America annually. Tornadoes frequently cause devastation to farms, towns, and even cities whenever and wherever they may strike. Fifty-two people have been killed by tornadoes in 2002 alone and many hundreds more have been injured. Eye witnesses who’ve had close brushes with these furious spiralling winds describe their approach like the roar of a jet engine. Tornadoes blast debris in every direction – often at speeds of hundreds of kilometers per hour. Most houses are made to withstand wind speeds of up to 110 km/h, but a tornado doesn’t even register unless it reaches 117 km/h. Though tornado forecasting has vastly improved over the past few decades, predicting where a tornado will touch down next is virtually impossible. Meteorologists observe the development of temperature and wind flow patterns in the atmosphere. It is these factors which create moisture, instability, lift, and wind shear needed for ‘tornadic’ thunderstorms to develop. However, forecasting severe weather more than two days in advance is little more than guesswork.


Eye witnesses who’ve had close brushes with these furious spiralling winds describe their approach like the roar of a jet engine. Tornadoes blast debris in every direction – often at speeds of hundreds of kilometers per hour. Most houses are made to withstand wind speeds of up to 110 km/h, but a tornado doesn’t even register unless it reaches 117 km/h.

A network of storm chasers and tornado watchers across the United States compile data on tornadoes as they happen. This can sometimes be a very dangerous task. Spotters feed live information to America’s National Weather Service as the tornados develop. This can often mean being what normal people would regard as suicidally close to a twister.

Tornados. (2010 m. Kovo 03 d.). http://www.mokslobaze.lt/tornados.html Peržiūrėta 2016 m. Gruodžio 05 d. 14:35