The severe storm this weekend and why it’s not a hurricane

26 10 2013

There is much coverage of the storm heading our way later this weekend with mentions of it being a ‘hurricane’. This is not strictly correct as we don’t get hurricanes in the UK and this is why.

Hurricanes are warm latitude storms; they draw their energy from warm seas and can only begin to form where the ocean is warmer than 26 degrees Celsius or so, and can really only become a major storm when the sea is warmer than 28 degrees Celsius. That’s like a warm bath, so you won’t find one around the UK anytime soon!

Other limitations, like wind patterns in the upper atmosphere and the forces caused by the Earth’s rotation, mean hurricanes are normally found in an area between 8 and 20 degrees north of the equator.

You can find a full explanation of what hurricanes are and how they form on our What are hurricanes? video

The storm which is due to develop tomorrow night and affect the UK during Monday is a mid latitude storm, the sort which affect us through the autumn and winter. These are formed in a very different way – by the meeting of different air masses on what is known as the polar front, leading to low pressure (storms) forming, often around the latitude of the UK.

The storm which is due tomorrow is expected to bring very strong winds and heavy rain, and we are warning of winds gusting 60-80 mph quite widely and locally over 80 mph, especially on exposed coasts, both in the southwesterly winds ahead of the low centre and west to northwesterly winds behind it.

Winds of that strength are classified on the Beaufort scale as ‘hurricane force 12’ but that is not the same as being a hurricane. Winds of this strength could bring down trees or cause structural damage, potentially causing transport disruption or power cuts and we are working closely with the resilience community to ensure they are prepared for the expected conditions.

You can find practical advice about what to do in winter weather on our Get Ready for Winter website.





More heavy rain and gales on the way

22 11 2012

As forecast, unsettled weather continues across the UK, with more heavy rain and strong winds expected to affect all areas over the next few days.

The Met Office, Environment Agency and Scottish Environment Protection Agency are warning the public to be prepared for possible travel disruption and flooding as some areas see up to 60 mm on top of the rain that has fallen over the last few days.

Paul Gundersen, Met Office Deputy Chief Forecaster, said: “The current unsettled spell of weather is set to continue with further spells of heavy rain expected across the country over the next few days.

“There has been some torrential rain and squally winds on Thursday as a cold front moved across the UK, but another deep depression developing off Iberia will head towards us for the weekend. This is expected to bring more heavy rain and strong to gale force winds to many parts of the country. We urge everyone to keep up to date with forecasts and warnings and be prepared for what the weather will bring.”

There is some uncertainty about exactly what track the low pressure will take at the weekend and so where the strongest winds will be. Currently we are forecasting the potential for gusts of 60 -70 mph for southeastern coastal counties of England overnight Saturday and into Sunday with the potential for storm force winds over the English Channel.

The public can keep up to date with the latest forecasts and warnings for their area on our website and with forecasts on TV and radio during this unsettled spell. You can also be #weatheraware by following us on Twitter @metoffice








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