Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 801 AM EDT Sat Aug 01 2015 Valid 00Z Sun Aug 02 2015 - 00Z Sun Aug 09 2015 Surface high pressure initially to the north/northeast of the islands will support moderate trades early in the period. During the weekend some remnant moisture from Tropical Depression 8E may help to enhance rainfall especially over the Big Island. Some degree of trade flow should persist into the first part of next week. Forecast details become increasingly uncertain by Wed-Fri as guidance maintains the spread seen yesterday for the track of Hurricane Guillermo. Some timing differences arise as well. A southern track as reflected in latest ECMWF/ECMWF mean runs would lead to a heavy rainfall threat for at least a portion of the state. On the other hand a northern track as in GFS runs would carry the greatest proportion of moisture just north of the islands. Of course exact track will be crucial for wind speeds/direction as well. Consult National Hurricane Center products for the latest information regarding Guillermo. The 0900 UTC advisory indicates a track that would bring the center of Guillermo to a position a little northeast of the Big Island as of 0600 UTC Thu. Trade flow should resume once Guillermo passes by. Rausch