Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 807 AM EDT Wed Sep 19 2018 Valid 00Z Thu Sep 20 2018 - 00Z Thu Sep 27 2018 Upper ridging is forecast to drift westward across the region later this week through the weekend as a pair of closed lows develop to the northwest and then northeast of Hawai'i. After a trough moves past the area tomorrow with scattered showers, the area will generally see fair conditions with modest trades and light mauka/windward showers. By next Tue/Wed, upper low to the northwest is forecast to weaken but then be reinforced by upstream troughing but the trough axis should stay west of 165W. The models/ensembles show the heaviest rainfall to the east of this trough just to the west of the westernmost islands, but some light/moderate rain may creep toward Ni'ihau/Kauai. Fracasso