Storm Doris is expected to bring gale force winds to London and the south east of England tomorrow (Thursday February 23).

The Met Office has extended the severe yellow weather warning and introduce an amber severe weather warning for some of the southern counties.

These forecast conditions have prompted the Met Office to name the storm "Doris".

The Met Office has released a video explaining how it names a storm when it has the potential to cause an amber "be prepared" or a red "take action" warning, based on the Forecasters National Severe Weather Warning Service.

A yellow weather warning has been issued for London and the south east of England

"'Storm systems' could be named on the basis of impacts from wind but also include the impacts of rain and snow," The Met Office says in the video.

Storm Doris is the first storm to be named in 2017, it follows storm Conor, which hit the UK over Christmas, making it the fourth storm so far this winter.

The next storm on the list, as the naming process makes its way alphabetically, is Ewan.

The Met Office has warned of possible disruption to travel due to high winds

Ahead of the storm tomorrow, a spokesman for the Met Office, Graham Madge told getwestlonon: "Within the yellow weather warning area, which is valid from 5am tomorrow until 8pm, we're expecting gusts widely of 50-60mph across the warning area."

"The amber area does extend very close into the home counties, parts of Essex and Hertfordshire, so it is going to feel very, very breezy tomorrow and we are expecting some disruption."

Gusts of up to 80mph are forecast

He adds: "We're expecting the stronger winds to occur in the amber area, but even within the yellow area, you've still go the chance of 70mph winds in some places."

Watch below the forecast path of storm Doris.

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