Videos | Huge fiery hurricane terrifies San Francisco residents as authorities sound alarms

Arab Weather - Sinan Khalaf - Tweeters circulated on social media a video clip showing the moment a terrifying fire tornado formed in San Francisco, California, USA last night, and the video also shows the authorities issuing warning sirens to the residents of the area.

What are fire tornadoes and how do they form?

A fiery hurricane is a big whirlwind of flame that occurs when the hot air rises upwards in a rotational movement, to be replaced by the cold air from below and to rise again towards the top carrying with it the flames in the form of a frightening fiery vortex in its shape and movement.

Devastating fires sweeping California

It is reported that large parts of the US state of California have been exposed for nearly two weeks of time to a huge wave of fires, which has so far caused the deaths of 6 people and displaced more than 50 thousand people.