The 2093 London tornado was a high end F4 (T9) tornado that devastated some heavily built up areas within Londons boroughs whilst on the ground. It lasted 37 minutes, and caused £805 million in damages as a result of its slow tracking - an average of just 7 mph during its entire existence. As the tornado hit the city center, TORRO issued an Enhanced Risk Tornado Watch, the equivalent to a US PDS tornado watch. It was the worst tornado to hit London since 1091, and even prompted the first Tornado Emergency ever issued outside of the US as a result of its brutality whilst on the ground.