California's Summer Forecast: Dangerously Shifting Hazards

Summer officially begins on June 21, with forecasters indicating a season of persistent heat, increased wildfire danger, and the potential for sudden flooding across California.

The National Oceanic and Atmospheric Administration's Climate Prediction Center forecasts above-average temperatures through July, August, and September for most of the U.S., including California.

This heat signal is compounded by ongoing drought in some areas and a precipitation outlook influenced by monsoonal moisture. Southern California and parts of the Southwest may experience above-average rainfall due to tropical systems, potentially easing drought.

However, this increased moisture raises the risk of flash flooding and debris flows, especially in areas affected by wildfires. This creates a dangerous 'flip risk,' transitioning rapidly from fire threats to flood hazards.

Regional outlooks vary: Southern California anticipates punctuated rainfall, while the Central Coast and Valley face continued elevated fire alerts. Northern California and the Sierra Nevada should watch for lightning-induced fires during dry storms.

Fire agencies anticipate elevated wildfire risk early in the summer due to heat drying vegetation. Later, increased moisture could lead to hazardous rainfall events, particularly in burn zones where reduced water absorption heightens mudslide and debris flow risks.