Sunday's racing at Musselburgh is subject to the course passing a precautionary inspection at 7am.
Officials at the Scottish track are optimistic that racing will go ahead, but general manager Bill Farnsworth thought it prudent to keep people informed as snow is forecast overnight.
Farnsworth said: "I was a bit reluctant to call the inspection really but we have been forecast between one and five centimetres of snow.
"There's a chance it could be sleet, but there is a good chance we'll get at least some snow.
"The forecasters have also said there will be winds tomorrow and there should be some sunny spells, so they are fairly confident any snow should have disappeared by midday.
"The top and bottom of it is that we're very hopeful."
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