


Prognostic Meteorological Discussion
Issued by NWS
Issued by NWS
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072 FXHW01 KWNH 070658 PMDHI Hawaii Extended Forecast Discussion NWS Weather Prediction Center College Park MD 258 AM EDT Mon Apr 7 2025 Valid 00Z Tue 8 Apr 2025 - 00Z Tue 15 Apr 2025 Surface high pressure rebuilds northwest of the state near 30-35 degrees north through early in the week, with mainly ENE trade wind flow expected, and then the high becomes centered north of the state by Thursday into Friday and more easterly flow, with good overall model agreement across the Hawaii domain. A weakness likely develops in the subtropical ridge axis by Sunday north of the state, with some reduction in the trades possible. In terms of rainfall prospects, mainly trade wind induced showers can be expected most days across the windward terrain. The ensemble means suggest an upper trough could develop near 150 degrees west by midweek, and this may result in a slightly greater coverage of showers during this time, but nothing major expected. Hamrick