Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
331 AM EDT Fri May 29 2026

Valid 00Z Sat 30 May 2026 - 00Z Sat 06 Jun 2026

Developing Omega block pattern along the Dateline in the high 
latitudes will favor an upper low over the northeastern Pacific as
well as west of the island chain (near 170E). Higher than normal 
heights in the deep tropics will leave the 50th state in a region 
of near normal heights and mostly benign weather. Breezy trades 
due to a strong surface high well to the northwest will subside 
this weekend as the pressure gradient relaxes but then pick up 
again next week. Deep moisture will remain south of the region 
though precipitable water values may increase from the southeast 
early next week as an upper low tries to form near/east of 150W. 
This may promote a bit more rain over at least the Big Island by 
midweek (potentially into Maui and Molokai/Lanai). Otherwise, 
relatively dry conditions will prevail in the short term with 
typical windward/mauka showers followed by sea breeze-driven 
showers amid lighter flow.

Fracasso