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Hawaii Extended Forecast Discussion
(Latest Discussion - Issued 0739Z Mar 26, 2023)
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Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
337 AM EDT Sun Mar 26 2023

Valid 00Z Mon Mar 27 2023 - 00Z Mon Apr 3 2023

The weather pattern is forecast to be rather unsettled across the
northwestern Islands for much of the upcoming week as a large
synoptic scale upper trough will result in a couple of slow moving
low pressure systems between 160 and 170 degrees west.  The first
low will continue lifting northeast and away from the state
through Monday, and then a second low develops closer to 30
degrees north by Tuesday night that could be more impactful.  This
low will likely idle over the northwestern Islands through late
Thursday before slowly lifting north on Friday. 

Multiple rounds of heavy rainfall are likely for much of next week
for the Island of Kauai and points westward, and more scattered
showers for the remainder of the state.  With the col in the
subtropical ridge centered near 165 degrees west, this will put
the main Islands on the southwestern edge of the surface high that
will provide mainly ESE to SE trades for much of the upcoming
week, with the strongest low level flow over the Big Island.