India, July 30 -- A tsunami struck Hawaii around 7:30 p.m. local time on Tuesday following a powerful 8.8 magnitude earthquake off Russia's Kamchatka Peninsula. According to the Pacific Tsunami Warning Center (PTWC), the Haleiwa gauge in Hawaii recorded a tsunami amplitude of 4 feet above normal sea level. Waves nearly 6 feet high were reported in Maui, based on NOAA data.

The Hawaii County Civil Defense Agency warned that follow-up waves over the coming hours could be even larger.

"It's not over yet: Initial wave impacts from the leading edge of the tsunami measured several feet at some monitoring stations, but "follow-up" waves over the next several hours often are LARGER. Don't return to evacuated areas until the Tsunami Warning is o...