Dallas: Destroyed by what is declared a super-tornado, one exceeding an F5 on the Fujita scale. The presentation also describes the fact that the probability of this catastrophe is the highest of all the proposed scenarios.
New York City: In the year 2011, being subject to a powerful geomagnetic storm, causing widespread damage to electronics, and several bizarre extraterrestrial anomalies.
Hong Kong: The victim of a super typhoon from the West Pacific. 12 years after the episode aired, Super Typhoon Mangkhut struck Hong Kong, but thankfully no one was killed in the city as it had already weakened as a Category 1 typhoon during Mangkhut's final landfall.
London: Deluged by a massive flood that breaks past the city's levees.
Sydney: Engulfed in the flames of a large firestorm that is brewing out of control during the dry summer weather. Similar to some phenomena seen in the Black Saturday bushfires, which occurred less than 3 years after this show's premiere. The scenario also describes that 90% of all investigated fires are caused by man-made activity, particularly by arsonists.
Montreal: Stricken by a severe ice storm, in a manner similar to the North American ice storm of 1998.