A yellow warning for wind is in force in Cornwall and Devon until 17:00 GMT
Thousands of properties are experiencing power cuts across the two counties
Firefighters are urging drivers in Cornwall to avoid non-essential travel
There are reports of flooding and trees down on several roads
A gust of 83mph (133 km/h) was recorded at Berry Head in Devon
Johnny Rutherford
BBC News, South West
I've been at the coastguard lookout at Pendennis in Cornwall where people have been watching the waves and the wind.
The wind was strong but then there was suddenly hail.
Now the sun is up and it's calm - it's been four seasons in a day.
Image source, BBC Weather Watchers/PoppyChoppy waves can be seen at Croyde Bay in Devon
Flooding has been affecting roads on the A39
Image source, MorvaCobble Corner in Cornwall was closed due to roof slates falling off buildings
Trees have fallen in Cornwall
What is the latest with weather warnings today and into the week ahead?
A yellow wind warning is in place, external across Devon and Cornwall and will apply to until 13:00 GMT.
Another wind warning covering a large chunk of Devon is in place until 17:00 GMT, external.
A yellow warning for rain, external applies for both counties until 06:00 GMT on Monday.
Image source, Met OfficeYellow wind warnings are in place across Devon and Cornwall
More than 4,500 properties are now without power in Devon and Cornwall as strong winds sweep across the South West.
National Grid says 2,968 properties have been hit in Cornwall, with another 1,488 in Devon.
Flooding between Par and Newquay means that the line is blocked, National Rail says., external
Trains running between these stations have been cancelled and disruption is expected until the end of the day.
Replacement bus servcies are running between Par and Newquay calling at all stations.
Train travellers can use their tickets on these Go Cornwall, external routes at no extra cost:
Image source, BBC Weather Watchers/Tina BWaves can be seen crashing on to the pathway in Teignmouth
People are being urged to stay away from the coast due to crashing waves.
Maggie Howell from Falmouth Coastguard says the conditions out at sea are "really, really bad".
She says: "Don't go trying to go wave watching or anything like that because not only are you risking yourself, you're also risking the people that will come out and try to help if you get into trouble."
A Ryanair flight that was expected to land at Cornwall Airport Newquay at 07:35 was diverted to London Gatwick, with other flights delayed, the airport, external says.
At Exeter Airport, flights to and from Belfast and Jersey have been cancelled.
Other flights have taken off - including a flight to Malaga and London Gatwick that both departed from Newquay.
Bee Tucker
BBC South West broadcast meteorologist
The strongest winds are starting to transfer east, however the yellow wind warning remains in place for the South West.
A gust of 83mph (133 km/h) was recorded in the last hour at Berry Head in Devon.
Additional wind warnings remain in place for Monday, with south-westerly winds forecast to gust 60-70mph (96-112km/h) throughout the day.
Here is a round-up of what has been happening in the South West so far:
More than 3,000 properties are without power in Devon and Cornwall, National Grid, external says.
It says more than 2,300 properties are without electricity in Cornwall and more than 1,000 properties are affected in Devon.
A Met Office, external yellow warning for wind has been extended in Cornwall and parts of Devon until 13:00 GMT.
The wind warning had only been in force until 11:00 before it was extended.
A yellow warning for rain remains in place for both counties until 06:00 on Monday.
Image source, BBC Weather Watchers/Mousehole PatWe're bringing you live coverage of disruption in the South West as wind and rain lashes the region.