Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 819 AM EDT Fri Sep 19 2014 Valid 00Z Sat Sep 20 2014 - 00Z Sat Sep 27 2014 Disturbance to the south of Hawai'i will slowly push westward along 15N through the weekend, allowing PW values to rise to near 2 inches over the Big Island before dropping back to about 1.25 inches by Tuesday next week. Strong upper ridging currently just west of the Dateline is forecast to move eastward along 30N and center just NW of the state next week. Forecast 500mb height standardized anomalies should rise to near +2.5 with this closed high -- some models raise heights to 6000m. This will allow some increased moisture to advect into the region from the northeast toward the end of next week as advertised by a modest rise in PW values. With the sfc high forecast to be near 1028mb, trades should increase next week with more scattered showers abound. Fracasso