Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
348 AM EDT Wed Sep 29 2021

Valid 00Z Thu Sep 30 2021 - 00Z Thu Oct 07 2021

Rounds of surface high pressure systems tracking well north of
Hawaii should lead to moderate to breezy easterly trade winds
through much of the period. Meanwhile in the upper levels, the
state should be generally underneath lower heights for the next
week, and an upper low could even form just to the north of the
islands over the weekend. The weaknesses in the upper flow should
allow for some periods of increased available moisture approaching
from the south, beginning as early as Thursday. So increasing
showers are possible, especially for windward areas of the Big
Island initially. Depending on the position of the upper low,
showers could increase for other islands as well this weekend into
early next week, so this will continue to be monitored.

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