A tsunami advisory was downgraded to a watch for Southern California coastlines after little activity was seen overnight, but weather experts warned that fluctuations in the tide could continue throughout Wednesday, July 30, following an 8.8-magnitude earthquake near Russia.

Japan's meteorological agency warned that a tsunami about 1 meter (3 feet) high was expected to reach Hokkaido in the north around 10:00 a.m., local time, with waves arriving later in the day along parts of eastern Honshu and Kyushu in the south.

Waves were reported along a wide swath of the Northern California coast, including in San Francisco. The rest of the state was under a lesser tsunami advisory.