Long range ensemble runs keep positive height and surface pressure anomalies through the first week of May almost right where they are. Combined with the persistent negative pressure and height anomalies near the Bering/Aleutians, this favors southerly flow over the Beaufort, Chukchi and eventually the CAB itself, resulting in widespread warmer than normal temperatures. The details will vary a bit (indeed the high is forecast to temporarily weaken in a few days as a small upper low meanders around), but the large scale pattern looks to remain unchanged through early-mid May. If it continues much further past that, we'll have record early snow melt and melt ponding over a fairly large area.
The upcoming warm episode in western Siberia and a few days later in NW Canada/AK looks to remove most of the remaining snow cover over those areas. In fact, the latest EC run begins developing an omega block over western Canada from day 7 onwards, which, if correct, would melt the snowpack back all the way to the Arctic Coast right around the start of May. Ensembles show some support for it.