Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 910 AM EST Fri Nov 17 2017 Valid 00Z Sat Nov 18 2017 - 00Z Sat Nov 25 2017 The main synoptic-scale system impacting the weather across Hawaii during the forecast period will be a cut-off/closed low which has continued to drop southward from the higher latitudes toward Hawaii. Model guidance agrees that a cold front associated with this system will pass through the Hawaiian island chain on Saturday with a brief period of enhanced showers possible, followed by winds shifting to more west to northwesterly directions. Some post-frontal showers can be expected at times on Sunday as the marine layer on the back side of the vortex will appear to move into the area. The cyclone should begin to pull out on Monday as it gradually opens up as a positively tilted trough further to the northeast. Thereafter, models agree that a subtropical high will slowly build southeastward into the region with a gradual resumption of the trade winds toward the middle of next week. Models no longer indicate the possibility of tropical moisture approaching from the south later next week. However, they begin to indicate the possibility of another cut-off low forming about a few hundred miles northeast of Hawaii toward next weekend. Kong