A weather warning is in place from 10:40am Wednesday until 7am Thursday.
Winds of up to 70mph are expected to batter the region through Wednesday and into Thursday.
Storm Brian has officially been named and will batter Merseyside over the weekend.
Some damage to buildings, such as tiles blown from roofs could happen, perhaps leading to injuries and danger to life from flying debris, they also warn.
Forecasters have warned that former hurricane Maria will arrive by Sunday, bringing strong winds and heavy rain.
The warning is in place as an area of low pressure that was once Hurricane Maria, will track across the UK bringing the heavy rain and strong winds.
Storm Aileen has brought torrential rain to Merseyside overnight and this morning along with gusty winds.
Wirral coastguard have warned to think carefully about the risks you take and to be extremely careful during and after Storm Aileen.
The Met Office has named the first storm of the season and it is set to batter Wirral and Liverpool tonight.
The upgrade of weather warning and naming of storm Aileen is down to an area of low pressure heading our way tonight.