Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 814 AM EDT Sun Sep 13 2015 Valid 00Z Mon Sep 14 2015 - 00Z Mon Sep 21 2015 An upper high to the north of the 50th state is forecast to slide westward to about 165W by Tuesday, allowing a weakness to creep closer to the region later in the week. Surface high pressure will sink southward along 155W but weaken, favoring more typical easterly or ENE trades. PW values are forecast to oscillate between near climo and above climo (about +3 sigma) as waves of moisture pass through the region. The ensembles have been fairly consistent on this ebb and flow, and a 00Z GFS/ECMWF compromise should suffice. Fracasso