Hours after a 2,000ft-high tornado was spotted off the south Wales coast, forecasters are warning that more gales will hit Wales on Monday.
Winds up to 70mph are predicted for Monday evening, causing disruption to transport.
On Sunday, onlookers said the sky went dark and the sea level rose as the tornado made its way up the Bristol Channel at around 1310 GMT.
It began as a waterspout, a column of water rising over
the sea, before sweeping inland.
It did not cause any damage and died out after 20 minutes.
A forecaster from the Meteorological Office's headquarters
said such phenomena were "far from unusual", with between 50 and 100 tornadoes and waterspouts in and around the UK each year.
Dr Anthony Harris, who lives near the beach at Sully in the Vale of Glamorgan, said it was a dramatic sight.
"It went very dark, like night. There were hailstones and the sea gushed up, " he said.
Another view of the 'tornado' over Barry
"This huge black cloud came across and to me it was identical to a tornado as I have seen one before."
Weather reports predicted heavy storms were expected to arrive on Monday evening with severe gales over southern Britain bringing gusts of 60-70mph.
The Met Office's shipping forecast has predicted gale force eight to storm 10 conditions in the area.
Met Office chief forecaster Eddy Carroll said: "After the recent spell of bad weather, we are advising the public to expect stormy conditions which could cause structural damage and localised flooding."
People are being urged to ring Floodline on 0845 988 1188 for up-to-date flooding information.
On Sunday, coastguards in west Wales had to brave strong winds as they helped in the rescue of a 55-year-old woman who fell off a cliff path at Manorbier in Pembrokeshire.
She was taken to Withybush Hospital at Haverfordwest with a suspected broken leg.