The fading effects of Tropical Storm Mario are bringing substantial rainfall and intermittent lightning to mountainous and desert terrains,initiating a flood watch that remains in effect until 2:00 AM Friday. Authorities are urging residents to prepare for continued turbulent weather conditions.
Current Situation and Forecast
Table of Contents
- 1. Current Situation and Forecast
- 2. Temperature and Regional impacts
- 3. Tropical Storm Mario’s History
- 4. Understanding Flood watches and Warnings
- 5. frequently Asked Questions About Flood Watches
- 6. What are the rainfall totals expected in coastal San diego, inland valleys, and mountain areas?
- 7. Tropical Storm Mario Brings Rain to San Diego County: Weather Impact Analysis by NBC 7 San Diego
- 8. Rainfall Totals and Regional Variations
- 9. Flash Flood Warnings and Evacuation Orders
- 10. Understanding Debris Flows
- 11. Transportation Impacts: Road Closures and Delays
- 12. Power Outages Across the County
- 13. Preparing for a Prolonged Power Outage
- 14. Impact on Local Events and Activities
- 15. Looking Ahead: Forecast and Potential for Continued Rainfall
The National Weather Service anticipates peak moisture levels from the remnants of Mario throughout Thursday, with a gradual decrease in rainfall expected over the weekend. Mountainous and desert areas are forecast to experience the heaviest precipitation from late morning through early evening.Doppler radar detected a significant thunderstorm over the desert regions around 1:30 PM Wednesday,later moving westward toward the mountains by approximately 2:10 PM,as noted by Meteorologist Greg Bledsoe.
The possibility of showers and thunderstorms will diminish from late Thursday into Friday, although some activity may persist in the mountains and deserts during Friday afternoon. The system’s intensity continues to wane as it tracks northward over cooler waters near Baja California, according to the National Hurricane Center in Miami.
Temperature and Regional impacts
Thursday’s temperature predictions indicate varied conditions across different regions:
| Region | Forecast | Temperature (°F) |
|---|---|---|
| Coast | Showers likely | 78 |
| Inland | Showers Likely | 88 |
| Mountains | Flood Watch | 77 |
| Deserts | Flood watch | 95 |
Did You Know? A Flood Watch means conditions are favorable for flooding in the area, but flooding is not yet occurring. Stay vigilant and monitor local news for updates.
Meteorologist Sheena Parveen indicates that current computer models suggest the potential for increased tropical moisture to affect the region again by the end of the week and into early next week. Friday is expected to be largely dry, though a slight chance of isolated showers or thunderstorms remains.
Tropical Storm Mario’s History
Mario briefly regained tropical storm status on Monday after weakening to a tropical depression last Friday. This cyclical pattern of intensification and weakening is common in tropical systems as they interact with varying atmospheric conditions.
Understanding Flood watches and Warnings
It’s crucial to understand the difference between a flood watch and a flood warning. A watch indicates that conditions are favorable for flooding to occur, while a warning means flooding is happening or is imminent. Always heed the advice of local authorities during these events. According to the National Weather Service, most flood deaths are caused by attempting to drive through floodwaters.
pro Tip: Never underestimate the power of moving water. Even six inches of fast-flowing water can knock you off your feet, and two feet can carry away a vehicle.
frequently Asked Questions About Flood Watches
- What does a flood watch mean? A flood watch means there is a potential for flooding in your area, and you should be prepared.
- What should I do during a flood watch? Monitor weather updates,clear drains and gutters,and move valuables to higher ground.
- Is it safe to drive during a flood watch? Avoid driving through flooded areas. Turn around, don’t drown.
- Where can I find more information about Tropical storm Mario? Check with the National Hurricane Center and your local National Weather Service office.
- How frequently enough do flood events occur in desert regions? While deserts are typically arid, they are prone to flash floods due to their terrain and infrequent but intense rainfall events.
Are you prepared for potential flooding in your area? Share your preparedness tips in the comments below!
What are the rainfall totals expected in coastal San diego, inland valleys, and mountain areas?
Tropical Storm Mario Brings Rain to San Diego County: Weather Impact Analysis by NBC 7 San Diego
Rainfall Totals and Regional Variations
As of 5:00 AM PDT, September 20, 2025, Tropical Storm Mario is impacting San Diego County with widespread rainfall. NBC 7 San Diego reports notable variations in precipitation across the region.Coastal areas are experiencing moderate rainfall, averaging between 0.5 and 1.5 inches.Inland valleys, including Escondido and Temecula, are seeing heavier downpours, with totals ranging from 1.5 to 3 inches.Mountain communities, especially Julian and Pine Valley, are facing the most considerable rainfall, exceeding 4 inches in some locations. This intense rainfall raises concerns about potential flash flooding and debris flows.
* Coastal San Diego: 0.5 – 1.5 inches of rain
* Inland Valleys: 1.5 – 3 inches of rain
* Mountain Areas: 4+ inches of rain
Flash Flood Warnings and Evacuation Orders
The National Weather Service has issued flash flood warnings for several areas within San Diego County, specifically targeting burn scar regions from previous wildfires. These areas are particularly vulnerable to debris flows due to the lack of vegetation to stabilize the soil. NBC 7 San Diego is actively tracking evacuation orders issued by local authorities. Currently, voluntary evacuation warnings are in place for residents near the Creek fire burn scar in Lakeside and the Valley Fire burn scar in Alpine.Residents in these areas are urged to monitor local news and emergency alerts for updates.
Understanding Debris Flows
Debris flows are a rapid movement of a slurry of water-saturated rock, soil, and vegetation. They are significantly more dangerous than typical flooding due to their high velocity and the presence of large debris, such as rocks and trees. The risk is heightened in areas recently affected by wildfires.
Transportation Impacts: Road Closures and Delays
The heavy rainfall is causing significant disruptions to transportation throughout San Diego County. NBC 7 San Diego reports numerous road closures due to flooding and debris.
* highway 79: Closed between Temecula and Julian due to multiple mudslides.
* Interstate 8: Experiencing significant delays near El cajon due to standing water.
* State Route 163: Reduced speed limits and lane closures due to hydroplaning concerns.
Commuters are advised to avoid unneeded travel and to check Caltrans QuickMap (https://quickmap.dot.ca.gov/) for real-time traffic conditions before heading out. public transportation, including the MTS bus and trolley systems, are experiencing delays and route modifications.
Power Outages Across the County
San Diego Gas & Electric (SDG&E) is reporting widespread power outages affecting over 25,000 customers across the county. The outages are primarily attributed to downed power lines caused by strong winds and heavy rain. NBC 7 San Diego is providing a live power outage map on their website, allowing residents to check the status of outages in their area. SDG&E estimates that full restoration of power may take up to 24-48 hours, depending on the extent of the damage.
Preparing for a Prolonged Power Outage
- Charge electronic devices: Fully charge phones, tablets, and power banks.
- Gather essential supplies: Stock up on non-perishable food, water, flashlights, and batteries.
- Stay informed: Monitor local news and emergency alerts for updates.
- Conserve battery power: Limit use of electronic devices and use battery-powered lighting.
Impact on Local Events and Activities
Numerous events and activities scheduled for today, September 20, 2025, have been canceled or postponed due to the inclement weather. NBC 7 San Diego reports the following cancellations:
* Del Mar Races: Canceled for the day.
* Balboa Park Events: All outdoor events in Balboa Park have been postponed.
* San Diego Zoo: Limited operations, with indoor exhibits remaining open.
residents are encouraged to check with event organizers for the latest updates.
Looking Ahead: Forecast and Potential for Continued Rainfall
The National weather Service forecasts that Tropical Storm Mario will continue to bring rainfall to San Diego County throughout the day. While the storm is weakening, the risk of flash flooding and debris flows remains high.Rainfall is expected to taper off by late evening. Tho, lingering showers are possible through Sunday. NBC 7 San Diego will continue to provide complete weather coverage and updates as the situation evolves. Stay tuned to NBC 7 News for the latest information.
