Why are storms named, and who chooses the names?
Storm Aileen is the first named storm of the season. Here are some of the key questions and answers about the naming of storms.
:: Why do we name storms?
The Met Office and Met Eireann launched the scheme in 2015 to name storms as part of efforts to raise awareness of extreme weather events in the UK and Ireland and prompt people to take action to prevent harm to themselves and their property.
:: How are the names chosen?
The public have been able to make suggestions for names to Met Office, which are then combined with names from Met Eireann, for a full list announced at the beginning of the storm season in early autumn.
:: What is the format for the list of names?
The list of monikers is drawn up in alphabetical order, alternating between male and female names. Storms are not named using the letters Q, U, X, Y or Z in line with international naming conventions, and names associated with storms which have caused a loss of life elsewhere in the world are not used.
:: When does bad weather get a name?
A storm is named when it is deemed to have the potential to cause medium or high impacts on the UK and/or Ireland, so weather systems where an amber or red warning is expected to be issued by Met Eireann and/or the Met Office will get a name.
:: So after Aileen, what's coming next?
The full list for this year's storms are: Aileen, Brian, Caroline, Dylan, Eleanor, Fionn, Georgina, Hector, Iona, James, Karen, Larry, Maeve, Niall, Octavia, Paul, Rebecca, Simon, Tali, Victor, Winifred.
:: Are we likely to see Storm Winifred?
Forecasters say it is too early to know how stormy this winter will be, but for comparison, the 2016-17 season saw five storms named, from Angus in late November to Ewan at the end of February.
In the 2015-16 season, 11 storms were named from Abigail in mid-November to Katie at the end of March.
:: Does naming storms have an impact?
The Met Office said research conducted after named storms show increases in awareness and action, with 89% of people polled after last year's Storm Doris aware of the severe weather.
Most (94%) of those aware of the storm had found the severe weather warnings useful, and 82% of those who had taken action felt they were right to do so, the survey found.