Updated Aug 23, see end of post
The end of this month could be shaping up to bring very unusual weather to interior and northern Alaska, judging from recent computer model forecasts; but there is extreme uncertainty as to how it might play out. In fact I don't recall when I last saw such pronounced disagreement among the leading models, as illustrated below in the 7-10 day 500mb height forecast from the ECMWF, GFS, and Canadian models (click for a larger version):
The ECMWF - widely considered the best model on this time scale - is showing a strong trough and cold anomaly over Alaska, but the Canadian (CMC) model shows a huge high-pressure block. These are ensemble mean forecasts, so typically when they show a large anomaly at this lead time, it is quite likely to occur - and therefore it's very rare to see such strong disagreement. The GFS is taking the middle of the road, although recent runs have been flipping back and forth. The very latest GFS run (more recent than shown above) shows cold air becoming entrenched over the state by the end of the month.
It will be fun to see which model wins out - or if they're all wrong. In any case, it seems quite likely that there will be an interesting outcome with the potential to break records. Those with outdoor plans towards the end of the month should pay attention, as the cold scenario would probably bring snow to the hills in many areas.
Update Aug 23: 48 hours later, and it looks like the ECMWF will be nearer to the mark. No surprise there. Here's the latest 7-10 day forecast:
Here's a time-height cross-section of temperature above Fairbanks from the latest GFS deterministic (not ensemble) forecast: pretty chilly by next weekend. It could still be wrong, of course; 5-7 days is a long time in Alaska weather forecasting.