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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Rain will spread southeastwards through N. Ireland, Wales and England overnight. Northern parts of Britain will remain mostly dry.
Two members of the public were injured along with two police officers who were in the unmarked vehicle.
One of the attackers who murdered a priest in a French church during morning mass in Normandy has been named by prosecutors.