 BBC News | Just how bad is an EF5 tornado? BBC News On Tuesday, officials at the US National Weather Service (NWS) upgraded the intensity of Monday's tornado in Moore, Oklahoma from its preliminary estimate of EF4 to EF5 - the top of the scale. But what does that mean? At its simplest, the highest level of the ... Oklahoma tornado: satellite images show tornado hitting Moore – video What is 'Tornado Alley'? Oklahoma tornado survivor reunited with her missing dog |
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