Tornado Warning Issued for Niihau in Kauai County, Hawaii as Offshore Supercell Shows Strong Rotation on Radar
HAWAII — A tornado warning was issued for Niihau in Kauai County after radar detected a strongly rotating offshore supercell Thursday morning, prompting immediate alerts for the small Hawaiian island. Radar images showed clear signs of rotation, raising concerns about the potential for a waterspout transitioning to a tornado as the storm neared land.
Radar Shows Strong Rotation Just Offshore
Weather radar scans showed a pronounced red-and-green velocity couplet, an indicator of strong rotation within the storm’s mesocyclone. The supercell appeared just southwest of Niihau before moving closer to the island, prompting meteorologists to issue the tornado warning. The rotation signature was strong enough to warrant a rapid response despite Hawaii’s relatively rare tornado occurrences.
Heavy Rain and Intense Storm Structure Trigger Alert
Alongside rotation, radar reflectivity images displayed a well-organized storm structure with high-intensity precipitation. Bright yellow and red reflectivity signatures suggested strong updrafts and heavy rainfall often associated with tornadic supercells. While radar cannot confirm a tornado on the ground, these signatures significantly increase the likelihood of dangerous conditions.
Hawaii’s Tornado Risk Is Low, But Not Zero
Tornado warnings in Hawaii remain uncommon, but they do occur when strong thunderstorms interact with the islands’ unique terrain and atmospheric instability. Niihau, being sparsely populated, faces fewer structural risks, but forecasters emphasize that any rotating storm near land poses a threat to residents, aircraft, and marine activity.
Residents and Mariners Urged to Stay Alert
Emergency officials advise residents and mariners in Kauai County to remain cautious as the storm system continues to track across nearby waters. Even if the rotation weakens, sudden shifts in wind speed, heavy rainfall, and strong downdrafts may still pose hazards.
Authorities note that radar updates will continue to monitor the storm’s progression, and additional warnings may be issued if the supercell strengthens or moves closer to populated areas.
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