Firefighters tackled vast amounts of smoke whipping across the countryside after nearby scrubland erupted.
Race-goers looked on in shock and one tweeted photos of the developing scene.
Venue chiefs gradually restored order to the schedule, though.
And Great Yarmouth Races tweeted to say: "Following inspection, race three (18:20) will take place shortly.
"We will continue to monitor the situation, and update throughout the evening."
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