Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 830 AM EDT Tue Sep 12 2017 Valid 00Z Wed Sep 13 2017 - 00Z Wed Sep 20 2017 To begin the period, a break in the subtropical ridge will allow a closed upper low to sink southward from the mid-latitudes. It remains quasi-stationary for a brief period before drifting northeastward toward the eastern Pacific. Eventually a secondary circulation forms just north and west of the Hawai`ian island chain with the 00Z CMC being a slow eastern outlier. For much of the weekend and into early next week, broad ridging extends over much of the central Pacific although the 06Z GFS hints at another disturbance swinging westward toward the region. At the surface, a stalled boundary lingers just northwest of Kauai through at least Thursday before the convergence zone weakens and lifts toward the north. Wind fields across the state are quite weak for the next couple of days before a surface ridging begins to build over the mid-latitudes. Rubin-Oster