K9AN (6505km) was the first 10m USA station to spot my 500mW WSPR beacon today at 1504z. I guess the undisturbed conditions today really helped.
UPDATE 1850z: Certainly up to now, the 2 spots this afternoon by K9AN appear to be "it", with no further USA spots since then.
UPDATE 1906z: EA8BVP (2986km) has spotted me several times again today.
UPDATE 2030z: Late opening to Italy suggests Es.
UPDATE 2120z: As late as 2116z K9AN (6505km) was still spotting my 500mW 10m WSPR beacon. K9AN must have a very good station (low angle antenna?) but I am surprised only K9AN was copying me in the USA. I would have expected other spots from other USA stations once the band opened. I shall leave the gear running to see how late this opening lasts.
UPDATE 2204z: Tbe last USA spot seems to have been by K9AN about 30 minutes ago. Only the one USA station spotting me lots of times - odd.