My 500mW 10m WSPR TX beacon PA was turned on at 1140z. At first I was puzzled by a spot at 0900z by EA8/DF4UE (2876km). Then I realised he had copied me with the PA off. My beacon is preprogrammed to say 0.5W, but in reality the power was just microwatts. This accounts for why the report was just -31dB S/N.
The beacon is now at full power of 500mW.
UPDATE 1535z: 55 stations have spotted my 10m 500mW WSPR TX beacon so far today. The furthermost is PP5ZX (10058km) in Brazil.