What's the situation in Glendora? My son lives there.
I live in the foothills just a few miles from Glendora and we got 4 inches of rain between 4:00 last night and this morning at 7:15 a.m.
He should be fine as long as he stays away from the foothills, any burn areas, avoids the beaches and the San Fernando Valley, he'll stay dry and safe.
I work in San Dimas (adjacent to Glendora) and live in Ontario, which is a few cities away. We had a flash flood warning from around 5:45 to around 11:45 last night. They weren't kidding either. It was raining cats and dogs here. I don't think Glendora at the western edge of the Pomona Valley was hit as hard though.
I live in Glenodra. We had some SERIOUS rain early this morning and again just before 10 AM PST. Hadn't seen that much rain in a long time. Light showers at the moment.
Not sure how the foothills are holding up. I mountain bike up there and they were in pretty bad shape even before all this rain...