At 0100 GMT on Sunday, the storm has not yet started developing. But a large mass of cloud to the south west of Iceland is moving east towards the UK.
By 0400 GMT the first sign of a low pressure area is beginning to appear in the form of a slightly darker patch at the top of the cloud mass.
At 0800 GMT the dark mass at the north end of the cloud mass is becoming more pronounced as the cloud bulges into a long finger pointing north-west.
At 1100 GMT the finger of cloud is starting to develop a distinctive "hook" shape as winds begin to swirl at high speed - creating the beginning of a low pressure "hole".
By 1700 GMT the storm heads for Ireland, set to bring strong winds and heavy rain by midnight Sunday. Another low pressure area is due to hit England and Wales on Monday.
At 2100 GMT, the storm reaches Wales and Cornwall bringing weather fronts and shower clouds. Seven severe weather warnings are in place across south-west England.
At 0300 GMT on Monday, winds are reaching speeds of up to 70mph and reports are emerging of falling trees and power lines down across Devon and Cornwall.
By 0600 GMT, the storm had reached its peak in south-west England leaving damage and disruption in its wake. More bad weather is forecast for later on Monday in the area.
At 0700 GMT the centre of the storm is over southern Ireland, with the strongest winds over southern Britain. Gusts of 65mph were recorded in the Solent.
By 0900 GMT the strongest winds were hitting Kent, with Manston recording gusts of 65mph.
By 1200 GMT the low pressure centre was in Cardigan Bay and cloud associated with the storm's frontal system is thrown ahead, up through Scotland and across the North Sea.
At 1600 GMT the low pressure had relocated to the Midlands. To the west of Ireland can be seen the frequent showers that are expected to reach the west of the UK on Tuesday.