HAWAII EXTENDED FORECAST DISCUSSION NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD 745 AM EDT MON AUG 06 2012 VALID 00Z TUE AUG 07 2012 - 00Z TUE AUG 14 2012 AUG 6 00Z ECMWF/GFS MODEL GUIDANCE CONTINUES TO BE IN DECENT AGREEMENT WITH THE LARGE-SCALE FEATURES AND MASS FIELDS ACROSS THE PACIFIC AND SUBTROPICS. THERE REMAINS SOME SMALLER SCALE DETAILS TO SHAKE OUT IN THE NORTH CENTRAL PACIFIC AND GULF OF ALASKA...HOWEVER...IN AND AROUND THE PERIPHERY OF THE HAWAIIAN ISLANDS...THE WEATHER ACROSS HAWAII SHOULD ONLY BE INDIRECTLY AFFECTED BY TUTT CELL ENERGY EMBEDDED ALONG/BETWEEN 20N-30N LATITUDE. A WEAK IMPULSE EMBEDDED WITHIN THE MEAN FLOW ALONG 30N SHOULD DRIFT EASTWARD AND POSSIBLY GENERATE ENOUGH MID-LEVEL SHEAR TO INDUCE SHOWER ACTIVITY INVOF KAUAI THROUGH TUESDAY. THIS IMPULSE AND ITS SMALLER SCALE DETAILS ARE WHAT THE 00Z GFS/ECMWF HAVE ISSUE WITH IN THE MEDIUM RANGE AT/AROUND AND AFTER 132 HOURS. THIS IMPULSE MIGRATES NORTHEASTWARD INTO THE GULF OF ALASKA...AND IS OF NO CONSEQUENCE TO THE ISLANDS. A MID-WEEK H5-H7 FLOW TRANSITION FROM WESTERLIES TO LIGHT SOUTHERLIES AND/OR SOUTHEASTERLIES CONTINUES TO BE IN THE OFFING...AND WILL SPELL A SUBTLE CHANGE TO THE PERSISTENCE APPROACH FOR THE WINDS/PRECIPITATION PATTERN. VOJTESAK