The omega block also allowed a slow-moving area of low pressure to impact the West. This low-pressure system brought a late-season rain into southern California, possibly the last decent rain of the wet season.
On Sunday, downtown Los Angeles received 0.30 inches of rain, which is more than the average precipitation of 0.26 inches expected in May. Downtown Los Angeles has received more than 4.5 inches of rain above average for the wet season, which began on Oct. 1.
San Diego measured 0.89 inches over the weekend, more than 7 times the average of 0.12 inches for May.
Precipitation totals for Saturday May 6 and Sunday May 7 across SW CA. Highest amounts in San Diego County. #LArain#LAweather #CAwx
In addition, snow fell in some of the mountains of southern California.
Southern California is not the only area of the West to experience unusual weather. A supercell, or rotating thunderstorm, was noted in southern Oregon, southeast of Crater Lake on May 4.
A tornado warning was issued for this storm and for the first time, the National Weather Service in Medford performed an aerial survey for evidence of tornado damage, but none was found.
https://weather.com/science/weather-explainers/news/supercell-thunderstorms-tornadoes
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