In Ontario, perhaps the strongest storm cell of the day rolled through before noon as some streets looked more like rivers.
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The 10 Freeway was a mess for most of the day. For a while, it was shut down completely on the westbound side when the driver of a truck crashed after leading Fontana police on a lengthy chase.
Some of the heaviest rain came down in the San Bernardino Mountains.
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Watch the video in the media player above for the full report.