The light showers that teased parched Southern California overnight should taper off Friday morning, but more rain could still be in store this weekend, forecasters said.
Any possibility of rain Friday night is "nothing to really write home about," he added.
That's bad news for a region suffering under bone-dry conditions.
Earlier this month, Gov. Jerry Brown declared a state drought emergency, and this week he met with Southern California water leaders to discuss the issue.
For the rain year that started July 1, 2013, downtown L.A. has received just 0.97 inches of rain, Kaplan said. The normal average for this time of year is 7.33 inches.
About one-third to one-half of an inch of rain fell in the San Gabriel Mountains on Thursday night, but most of Los Angeles County saw less than a tenth of an inch, Kaplan said.
According to a list of precipitation totals from the weather service, Morris Dam in the San Gabriel Mountains topped Thursday night's rainfall totals with 0.75 inches. Tanbark Flats and San Dimas Dam tied for second with 0.59 inches.