Honolulu

Honolulu Prepares for More Rain as Flash Flood Warning Is Issued Amid Intensifying Rainfall

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Published on October 18, 2024
Honolulu Prepares for More Rain as Flash Flood Warning Is Issued Amid Intensifying RainfallSource: Unsplash/ darkstar sr72

Today’s weather outlook for Honolulu shows a slight increase in showers. The National Weather Service reports that the windward slopes and higher elevations will see an "increase in overall shower frequency and coverage today" because of an upper-level low drawing in a moist southern air mass. Even the usually sunnier leeward areas may get a sprinkle or two.

Residents experienced heavier rainfall this morning, leading to flash flood advisories due to "localized high rainfall (rates) across Oahu's windward-facing Ko'olaus and eastern Kauai," according to the National Weather Service. Stream levels didn't rise significantly. However, the weather service warns of the possibility of "more isolated incidences" that could result in minor flooding throughout the day.

Looking ahead, the weekend brings prospects of sunnier skies and stiffer breezes. The trade winds are expected to pick up their pace, temporarily clearing out the clouds and ringing in drier conditions. Despite concerns about fire weather this weekend, forecasts indicate humidity and winds may stay below red flag levels, with "minimum %RHs could get close to Red Flag thresholds (=/< 45%)" on Sunday and Monday afternoons, according to the National Weather Service

For aviation enthusiasts or those planning to take the skies, smooth flying is anticipated with "VFR conditions should prevail with brief MVFR conditions possible in showers," and currently no AIRMETS are in effect, as per the National Weather Service aviation outlook. 

The marine report indicates low surf conditions, with small swells expected on north, south, and east-facing shores. A minor coastal flooding advisory is in effect, especially around daybreak, warning of potential water-level rises for early morning beachgoers and those in low-lying areas.