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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The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.
The man who carried out the Westminster attack is thought to be British born and was once investigated by MI5, the Prime Minister has said.
Jason Day, who lost his father to stomach cancer at the age of 12, broke down in tears as he explained his shock exit during the WGC event.