Short, intense storms gain intensity across Hawaiʻi
While long-term data show that Hawaiʻi is getting drier overall, short, intense downpours that cause sudden, dangerous flash floods are getting stronger on the islands, according to a new study by researchers at the University of Hawaiʻi at Mānoa.
Hawaiʻi is experiencing stronger, shorter downpours that intensify flash floods, according to a new 50-year study conducted by researchers at the University of Hawaiʻi at Mānoa. The research, published in the International Journal of Climatology, reveals climate trends that traditional daily averages often overlook. In the islands' steep, mountainous watersheds, intense rain bursts lasting one to six hours can overwhelm streams and storm drains before warnings are issued.
Professor Yinphan Tsang, the principal investigator, emphasizes the importance of analyzing short-duration, high-temporal-resolution data to fully understand extreme weather events. Rainfall intensity varies significantly even between neighboring areas due to Hawaiʻi's unique terrain. Two vulnerable periods for extreme hourly rain events were identified: October through December and February through March.
These heavy rains are typically triggered by cold fronts, Kona storms, and other winter weather systems. Unexpectedly, the February through March period nears the end of the wet season and could catch people off guard. The findings provide updates for emergency responders, county planners, and infrastructure designers. The collaborative study involved experts from various UH Mānoa departments and was led by Maxime Gayte.
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