ALASKA EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 104 PM EDT SAT AUG 15 2015 VALID 12Z WED AUG 19 2015 - 12Z SUN AUG 23 2015 FOR NOW, THE MODELS AND THE JTWC INDICATE THAT THE POWERHOUSE TWIN TYPHOONS, GONI AND ATSANI, BEARING DOWN ON THE MARIANAS WILL NOT BE A FACTOR IN THE FLOW ACROSS THE FAR NORTH PACIFIC THIS PERIOD. THE 00Z/15 ECMWF AND THE 06Z/15 GFS DEPART FROM EACH OTHER AND THE ENSEMBLE MEANS LATE NEXT WEEK WITH THE HANDLING OF THE ENERGY BLEEDING NORTHWARD INTO THE CENTRAL AND EASTERN ALEUTIANS. THE ECMWF LOOKS USABLE UNTIL ABOUT 00Z/21 FRIDAY, WITH A SWITCH TO THE ECENS MEAN THEREAFTER MITIGATING THE MODEL DISPARITY IN THE WAVE RIDING THE FRONT INTO THE ISLAND CHAIN. FAST FLOW AND CHANGEABLE CONDITIONS SHOULD PREVAIL ACROSS THE SOUTH, WITH COOLER WEATHER BANKING INTO THE NORTH SLOPE FROM THE ARCTIC OCEAN. CISCO