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Hawaii Extended Forecast Discussion
(Caution: Version displayed is not the latest version. - Issued 1200Z Apr 29, 2015)
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Abbreviations and acronyms used in this product

Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
800 AM EDT Wed Apr 29 2015

Valid 00Z Thu Apr 30 2015 - 00Z Thu May 07 2015

The 29/00Z guidance was in rather good agreement with all the
prominent Pacific sensible weather features. For Hawai'i---its the
surface high migrating west-to-east along 35N latitude---and its
intensity that produces  the appreciable uptick in tradewind
strength during the next 18-36 hours.

By Friday (1/12Z), the migratory surface ridge is on track to move
northeastward---weaken and ease the tradewind flow over the
weekend (days 3-4). High pressure begins to rebuild across the
east central Pacific early next week in response to a deep
mid-latitude upper-level cyclone and trough setting up invof 50N
and 160W very near the 6/12Z time frame (day 7). The trend in the
last couple of forecast cycles (12Z and 00Z versions) suggest a
more amplified flow pattern will be created---ahead of the day 7

Thought the embedded energy within the trough is more closely
depicted by the 29/00Z ECENS and its deterministic ECMWF run. The
NAEFS/GEFS means are just as reasonable solutions---though the
deterministic 29/00Z GFS would be a very sheared solution across
the mid-latitude Pacific by day 6 and would not necessarily 'fit'
the amplified trend of the 3 means heading into the day 8 time
frame (7/12Z).