Full Breakdown
Tropical Storm Mario Brings Rain and Thunderstorms to Southern California
9/17/2025, 1:02:19 PM
Overview of Tropical Storm Mario's Impact
The remnants of Tropical Storm Mario are set to bring significant rainfall and thunderstorms to San Diego County and broader Southern California starting Wednesday, September 17, 2025. The National Weather Service (NWS) has indicated that the storm's moisture will lead to increased humidity and a cooling trend across the region, with rain expected to continue through Friday.
Weather Forecast and Expected Conditions
Rainfall is anticipated to begin on Wednesday afternoon, with totals ranging from 0.25 inches to 1 inch, particularly in mountainous areas. Forecasters predict that scattered showers and thunderstorms may develop, with the most intense activity expected overnight Wednesday into Thursday. The NWS has warned that these storms could produce brief heavy rain, small hail, and lightning, raising concerns about localized flash flooding, especially in areas that have experienced dry conditions recently.
Kyle Wheeler, a weather service forecaster, noted, “We could have widespread showers into Thursday morning, then more scattered shows later on.” The storm is expected to affect not only San Diego County but also extend to Orange, Riverside, San Bernardino, and Los Angeles counties.
Criticism and Concerns
Meteorologists have expressed concerns regarding the potential for severe weather, including the risk of small tornadoes and flash flooding. Mike Wofford, a meteorologist with the NWS Los Angeles division, stated, “It could not just be a fun, nice little storm. There could be some significant impacts; we want to make sure people are aware of that possibility.” The combination of high temperatures preceding the storm and the influx of moisture could create conditions conducive to wildfires, particularly if lightning strikes occur in dry areas.
Official Statements & Responses
The NWS has issued alerts for Southern California, emphasizing the need for residents to prepare for the incoming storm. They have advised caution on the roads due to the potential for slick conditions and flooding. The agency has also indicated that the storm's trajectory and intensity will determine the exact rainfall amounts and areas most affected.
What's Next
Following the storm, another tropical system may develop, potentially bringing additional moisture to the region early next week. The NWS is closely monitoring this situation, as it could lead to further rain and thunderstorms, prolonging the wet weather pattern in Southern California.
Verbatim Quotes
- “We could have widespread showers into Thursday morning, then more scattered shows later on,” — Kyle Wheeler, Weather Service Forecaster
- “It could not just be a fun, nice little storm. There could be some significant impacts; we want to make sure people are aware of that possibility.” — Mike Wofford, NWS Los Angeles Division Meteorologist
As Tropical Storm Mario approaches, residents are advised to stay informed about weather updates and prepare for potential severe weather conditions.
