With the first race being delayed by only 5 minutes, horses at Cheltenham have started warming up despite the snow.
Thousands of spectators are expected for the Gold Cup week.
The Cheltenham Festival will open later amid warnings for race goers to leave extra time due to the poor weather.
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A band of heavy rain is heading for the UK, threatening to make the May Bank Holiday a washout, the Met Office has warned.
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Tonight it'll become dry and clear for most parts of Britain.