HAWAII EXTENDED FORECAST DISCUSSION NWS WEATHER PREDICTION CENTER COLLEGE PARK MD 753 AM EDT SUN JUL 21 2013 VALID 00Z MON JUL 22 2013 - 00Z MON JUL 29 2013 SHORT-TERM FORECAST THROUGH TUESDAY REMAINS ON TRACK WITH AN IMPULSE APPROACHING FROM THE SOUTHEAST AND SPREADING MID-LEVEL MOISTURE...AN EAST-SOUTHEAST WIND ACROSS THE EASTERN HALF OF THE STATE AND INCREASES IN PRECIPITATION COVERAGE FROM EAST TO WEST. 21/00Z GEFS/CANADIAN AND EC ENSEMBLE MEANS AND THEIR DETERMINISTIC RUNS WERE REASONABLE SOLUTIONS IN THE SUBTROPICS AND ALONG THE ITCZ THROUGH THE REMAINDER OF THE FORECAST PERIOD. AFTER WEDNESDAY...THERE IS EXCELLENT AGREEMENT FOR STRONG UPPER-LEVEL RIDGING TO BUILD IN ACROSS THE EAST PAC WITH DRYING AND BRISK TRADEWINDS ANTICIPATED FOR NEXT WEEKEND. TROPICS...THE DETERMINISTIC GFS MAINTAINS AN ACTIVE ITCZ ALONG 10N LATITUDE WITH SEVERAL WAVES MIGRATING SOUTH OF THE ISLANDS. NORTHWARD EXTENSION OF THE TROPICAL MOISTURE PLUME IS MINIMAL WITH STRONG RIDGING ANCHORED (INVOF 30N 140W) TO THE NORTH OF THE ITCZ. VOJTESAK