Hail fell inland from West Covina and Chino Hills to further east areas of San Bernardino County.
A funnel cloud was spotted in the San Dimas area, and a land spout was seen in Victorville Sunday afternoon. Residents were warned to stay inside if possible.
Lightning was also seen in some areas, while snow fell at the 4,500-foot level in the mountains.
The storms came just days after the region saw more typical summer-like conditions in the 80-degree range.
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The storms were expected to continue through Sunday night, with some rain expected through Monday and cool temperatures the rest of the week.