The Hawaiian Islands are currently facing the impacts of a powerful weather system, with flash flooding alerts issued across the state and even a surprising Winter Storm Warning for the mountain summits along the Big Island. A potent upper low pressure center situated just north of the island is responsible for bringing copious amounts of tropical moisture and atmospheric instability, resulting in strong thunderstorms that may meet severe criteria, including wind gusts of up to 50 mph and large hail.

According to National Weather Service, Honolulu Meteorologist Derek Wroe, once a shower or thunderstorm develops, it has the potential to produce strong wind gusts. With the upcoming graduation activities, this is a concerning situation. The smaller islands face the greatest threat of severe storms on Friday, spreading east into the Big Island by Friday night.

Apart from frequent lightning and gusty winds, the entire island chain is under threat from torrential rains. Some storms have rain rates of up to 3 inches per hour, presenting a significant flash flood risk. On Thursday night, the windward sides of Oahu already experienced 2-3 inches of rainfall, and more is expected as the rain spreads across the rest of the state on Friday. Flood Watches have been issued for all the islands, particularly targeting flood-prone roads and low-lying areas susceptible to runoff and overflowing streams. Urban areas are also at risk of property damage due to rapid runoff.

In a highly unexpected turn of events, the higher elevations of the Big Island are now under a Winter Storm Warning in mid-May. All mountain summits will experience wintry weather conditions until Saturday morning. The National Weather Service predicts the potential for up to 6 inches of snow, accompanied by blistering winds ranging from 40-60 mph, with gusts exceeding 70 mph.

The severe storms are expected to gradually subside from west to east on Friday into Saturday, as the storm weakens and moves northeast. However, a moist pattern is anticipated to persist into the following week, as long-range models suggest the possibility of more stormy weather looming later on.

The residents and authorities of the Hawaiian Islands are urged to remain vigilant during this period of severe weather, following any evacuation orders or advisories issued by local authorities. Stay informed about the latest weather updates and take necessary precautions to ensure personal safety and protect property from potential flood damage.