Toronto storm: 'Thundersnow' strikes city; heavy rain and thunderstorms expected later today / Thunderstorm risk for Rotorua, Waikato, Bay of Plenty today / Thunderstorm warning issued for parts of England and Wales / Thunderstorms and floods force evacuations / Thunderstorms and heavy rain sweep parts of UK / Three-year study suggests air pollution increases thunderstorm danger / Another hot and humid day, ending in thunderstorms / Thunderstorm warning with risk of 'torrential downpours' in England and Wales / 'Last Summer': A May-December affair with major thunderstorms / UK weather: Met Office issues warnings for more violent thunderstorms as summer flops