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Tropical Cyclone Mario Weakens, Sparks Thunderstorms in SoCal

9/17/2025

Summary

Story summary

Tropical Cyclone Mario weakened to a Tropical Depression, bringing increased humidity and potential thunderstorms to Southern California.
Scattered showers are expected to start Wednesday afternoon, with significant moisture from Wednesday night through Thursday.
Rainfall predictions range from 0.25 to 0.50 inches west of the mountains and 0.50 to 1.00 inches in mountainous and desert areas.
Thursday is a Weather Impact Alert Day due to slick roads and possible street flooding.
Isolated thunderstorms may continue into the weekend, especially in mountainous and desert regions, before conditions dry out on Sunday.

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Story summary

Tropical Cyclone Mario weakened to a Tropical Depression, bringing increased humidity and potential thunderstorms to Southern California.
Scattered showers are expected to start Wednesday afternoon, with significant moisture from Wednesday night through Thursday.
Rainfall predictions range from 0.25 to 0.50 inches west of the mountains and 0.50 to 1.00 inches in mountainous and desert areas.
Thursday is a Weather Impact Alert Day due to slick roads and possible street flooding.
Isolated thunderstorms may continue into the weekend, especially in mountainous and desert regions, before conditions dry out on Sunday.