ALASKA EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 210 PM EDT THU JUL 17 2014 VALID 12Z MON JUL 21 2014 - 12Z FRI JUL 25 2014 IT APPEARS THE DUST MAY FINALLY BE SETTLING AMONG THE GLOBAL NUMERICAL MODELS WITH REGARD TO THE FATE OF THE FLOW ACROSS THE ALASKA REGION AT THE MEDIUM RANGE. THERE ARE STILL ENOUGH MEANINGFUL DIFFERENCES AMONG THE OPERATIONAL SOLUTIONS TO WARRANT HOLDING OFF ON FINER DETAILS--NONDESCRIPT AS THEY ARE WITHIN THE REINVIGORATED BLOCK. THE EUROPEAN CENTRE ENSEMBLE MEAN HAS BEEN STEADILY TIGHTENING ITS RESOLUTION OF THE MAIN FEATURES OF THE BLOCK, SO CONTINUED TO RELY UPON IT AS A SYNOPTIC GUIDE THIS FORECAST. CISCO