Skip Navigation Links 
NOAA logo - Click to go to the NOAA homepage National Weather Service   NWS logo - Click to go to the NWS homepage
The Weather Prediction Center



Follow the Weather Prediction Center on Facebook Follow the Weather Prediction Center on Twitter
NCEP Quarterly Newsletter
WPC Home
Analyses and Forecasts
   National High & Low
   WPC Discussions
   Surface Analysis
   Days ½-2½ CONUS
   Days 3-7 CONUS
   Days 4-8 Alaska
   Flood Outlook
   Winter Weather
   Storm Summaries
   Heat Index
   Air Quality
   Tropical Products
   Daily Weather Map
   GIS Products
Current Watches/

Satellite and Radar Imagery
   Satellite Images
   National Radar
Product Archive
WPC Verification
   Medium Range
   Model Diagnostics
   Event Reviews
International Desks
Development and Training
WPC Overview
   About the WPC
   WPC History
   Other Sites
Meteorological Calculators
Contact Us
   About Our Site is the U.S. Government's official web portal to all federal, state, and local government web resources and services.
Hawaii Extended Forecast Discussion
(Caution: Version displayed is not the latest version. - Issued 1214Z Dec 13, 2014)
Version Selection
Versions back from latest:  0   1   2   3   4   5   6   7   8   9   10   
Abbreviations and acronyms used in this product

Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
714 AM EST Sat Dec 13 2014

Valid 00Z Sun Dec 14 2014 - 00Z Sun Dec 21 2014

Models show an amplified trough crossing well north of the islands
this weekend with the associated baroclinic zone gradually
shearing over Hawai`i. In its wake, building heights will allow
surface high pressure to settle to the north favoring an increase
in the northeasterly flow. During the early/middle part of next
week, the surface ridge will move east of the island chain
allowing low-level winds to veer toward more of an easterly
direction. Any meaningful height falls will continue to remain
well north of the region allowing little change in the pattern.
Looking to early next weekend, a rather potent cold front lurks
just east of the International dateline which will allow winds to
veer in response to increasing warm advection ahead of the system.

Regarding precipitation, the initial frontal boundary will spark
light shower activity given only modest precipitable water values
in place. The band of rainfall should migrate southward in time as
the boundary slowly begins to shear. Otherwise, a return to trade
wind-driven showers will become the norm throughout much of next
week with the usual upslope locations receiving the heaviest