The heavy rainfall means Wednesday night's scheduled regional age-grade fixtures have been postponed.
The Ospreys U18s were due to host the Scarlets at St Helens, while there was an Ospreylian derby between Ospreys East and West at U16 level scheduled for the Bridgend Ford Brewery Field but both fixtures have fallen foul of the heavy rain.
New dates will be confirmed via the website as soon as possible.