San Diego, December 21, 2025
San Diego County is bracing for a major rainstorm during the Christmas holiday, with forecasts predicting 2 to 4 inches of rain and possible flooding from December 23 to 25. Travelers are urged to exercise caution due to slick roads and winter driving conditions, especially in mountainous areas, where snow levels may drop to 5,500 feet. Local authorities advise residents to stay updated on weather reports and avoid flooded areas to ensure safety during this significant weather event.
San Diego Prepares for Christmas Rainstorm
San Diego, CA – A significant weather event is expected to impact San Diego County during the Christmas holiday, with forecasts indicating substantial rainfall and potential flooding from December 23 through December 25, 2025.
Forecasted Rainfall and Timing
According to the National Weather Service, a low-pressure system combined with an atmospheric river is projected to bring widespread heavy rain to the region starting late Tuesday, December 23, continuing through Christmas Day. Coastal and valley areas may receive between 2 to 4 inches of rain, with higher amounts possible in some locations. Mountainous regions could experience snowfall, with snow levels potentially lowering to 5,500 feet above sea level, contributing to hazardous travel conditions in higher elevations.
Travel Implications
The anticipated heavy rainfall poses significant risks for travelers. Slick roadways, reduced visibility, and the potential for flooding and landslides are concerns for both residents and visitors. The National Weather Service has issued advisories urging the public to exercise caution during travel, particularly in mountainous regions where winter driving conditions could be encountered. San Diego International Airport is also expected to experience increased passenger traffic during this period, with potential delays and cancellations due to the storm. Travelers are advised to check flight statuses frequently and plan accordingly.
Safety Precautions
Residents and travelers are strongly advised to stay informed about the latest weather updates and heed any warnings or advisories issued by local authorities. To ensure safety during this upcoming weather event, it’s recommended to monitor local news and weather reports regularly, avoid driving through flooded areas, and exercise caution on the roads, especially in mountainous regions where winter driving conditions may prevail.
Background Context
December in San Diego typically features mild and reasonably dry weather, with average daytime temperatures around 66°F (19°C) and average monthly rainfall of approximately 1.5 inches (37 mm). However, the upcoming storm is expected to be among the strongest atmospheric river systems in recent years, bringing significant precipitation to the region. This event underscores the importance of staying informed and prepared for unexpected weather patterns during the holiday season.
Key Features of the Pineapple Express Storm
| Feature | Description |
|---|---|
| Storm Type | Pineapple Express atmospheric river system |
| Expected Impact Period | December 23 to December 25, 2025 |
| Regions Affected | Southern California (including San Diego County) |
| Projected Rainfall | 2 to 4 inches along the coast and in the valleys; higher amounts possible in some areas |
| Potential Snowfall | Snow levels in the Sierra Nevada could drop to 5,500 feet above sea level |
| Travel Implications | Potential travel disruptions due to heavy rainfall, slick roadways, and possible flooding |
| Safety Precautions | Stay informed about weather conditions, exercise caution on the roads, and be aware of potential flooding and winter driving conditions in mountainous regions |
Frequently Asked Questions (FAQ)
What is the Pineapple Express storm?
The Pineapple Express is an atmospheric river system that draws moisture from the Pacific Ocean, bringing significant rainfall to regions it affects.
When is the storm expected to impact San Diego?
The storm is projected to begin affecting San Diego County on Tuesday, December 23, 2025, with the heaviest rainfall anticipated on Christmas Eve and Christmas Day.
How much rainfall is expected?
Coastal and valley areas may receive between 2 to 4 inches of rain, with higher amounts possible in some locations. Mountainous regions could experience snowfall, with snow levels potentially lowering to 5,500 feet above sea level.
What are the travel implications?
The heavy rainfall poses significant risks for travelers, including slick roadways, reduced visibility, and potential flooding and landslides. Travelers are advised to exercise caution, especially in mountainous regions where winter driving conditions may prevail.
What safety precautions should be taken?
Residents and travelers should stay informed about the latest weather updates, avoid driving through flooded areas, and exercise caution on the roads, particularly in mountainous regions where winter driving conditions may exist.
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