HAWAII EXTENDED FORECAST DISCUSSION NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD 756 AM EDT SUN AUG 05 2012 VALID 00Z MON AUG 06 2012 - 00Z MON AUG 13 2012 AUG 5 00Z ECMWF/GFS MODEL GUIDANCE IN DECENT AGREEMENT IN AND AROUND THE PERIPHERY OF THE HAWAIIAN ISLANDS...WITH SOME SEPARATION BY DAY 5...ACROSS THE ALEUTIANS...AND WITH WEAK TUTT CELL ENERGY EMBEDDED ALONG THE DATELINE AND TRACKING WESTWARD TO 150E BETWEEN 20N-30N LATITUDES. LOOKED LIKE THE 00Z GFS/ECMWF MASS FIELD BLEND WILL YIELD GOOD RESULTS ACROSS THE SUBTROPICAL AND TROPICAL PACIFIC. THERE REMAINS A SMALL WINDOW ON MONDAY/TUESDAY...FOR A WEAK IMPULSE EMBEDDED WITHIN THE MEAN FLOW ALONG 30N TO DRIFT EASTWARD AND POSSIBLY GENERATE ENOUGH MID-LEVEL SHEAR TO INDUCE SHOWER ACTIVITY INVOF KAUAI. OUTSIDE OF THIS...A MID-WEEK H5 FLOW TRANSITION FROM WESTERLIES TO LIGHT SOUTHERLIES AND/OR SOUTHEASTERLIES COULD SPELL A CHANGE TO THE PERSISTENCE APPROACH FOR THE WINDS/PRECIPITATION PATTERN FOR MAUI...THE BIG ISLAND AND OAHU. VOJTESAK