1 flash flood, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The Santa Ana Mts radar (KSOX), 71 km away, was scanning. The volume nearest the first event began at 03:16 UTC.
1 flash flood. Local standard time, as filed.
Heavy rain produced flash flooding across the mountains and foothills of East Central Los Angeles county. Near the Morris Reservoir area, flash flooding was reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in California in 1998Every state in 1998This day in weather historyWarnings in California, May 1998
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 5640765.