Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 812 AM EDT Fri Apr 07 2017 Valid 00Z Sat Apr 08 2017 - 00Z Sat Apr 15 2017 A nice solid ridge of high pressure over Hawaii will attempt to hold on through this coming weekend. This ridge slowly breaks down in response to an upstream digging short wave positioned currently near 30N166W beyond the dateline. The bulk of upper dynamics within the amplification will shear off downstream north of the islands but a batch will relocate west of the state on Sunday into Monday. This weakness will be a stationary feature west or northwest of the islands, which could increase shower activity across the northwest chain of the islands. Overall the global models have a good handle on this forecast scenario over the next week with only slight spread. Musher