Sunday's fixture at Towcester has been abandoned because of a waterlogged track.
Twelve millimetres of overnight rain has contributed to the adjacent River Tove having burst its banks. With standing water along the bottom of the track, course officials felt no need to delay the inevitable.
Towcester clerk of the course Robert Bellamy said: "I've been in office here six years and have never seen the River Tove as deep as this before."
He went on: "It's starting to recede now, but every forecast you look at indicates there is another band of heavy rain coming tomorrow.
"We were left with little option but to abandon now."
Exeter's meeting on Sunday is now subject to an 8am inspection on raceday morning.
Officials at the Devon circuit had intended to assess conditions at 8am on Saturday, but that has now been put back 24 hours.
Although the track was raceable on Friday morning, 18 millimetres of overnight rain fell - on top of 87mm over the last four days. An ominous forecast on Saturday is also giving cause for concern.
Exeter clerk of the course Barry Johnson said: "We'd be fine tomorrow, so it's pointless inspecting on Saturday morning.
"We are worried about a band of rain later on Saturday - we could see 40mm - but, at this moment in time, I'd be quietly confident we'd be OK. The course is taking the rain fantastically well."
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