CW3E Event Summary: 4-5 October 2021

October 5, 2021

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Rare October Thunderstorms Light Up Southern California

• Scattered thunderstorms produced heavy downpours and frequent lightning in Southern California during the evening of 4 Oct and early morning of 5 Oct
• The thunderstorms formed in a region of moist, unstable air, downstream of an upper-level cutoff low
• Many stations in western San Diego County received more than 0.50 inches of rain
• Lightning caused fires and scattered power outages throughout San Diego County

Summary provided by C. Castellano, C. Hecht, J. Kalansky, J. Martinez Claros, N. Oakley, and F. M. Ralph; 5 October 2021