The Tracy area is bracing for significant weather changes this week, with the return of the Delta breeze setting the stage for a notable drop in temperatures and the region's first chances of rain since May. A strong low-pressure system approaching from the northwest is expected to bring increasingly cooler conditions and potential precipitation starting Tuesday night. Residents can anticipate a pleasant Sunday before clouds increase and temperatures begin to fall more significantly on Monday.
The Delta breeze made its return on Sunday, offering slightly cooler temperatures and abundant sunshine across the region. While Valley temperatures remained pleasant, peaking in the low 80s on Sunday, breezy conditions developed during the late afternoon and early evening. These breezy winds are expected to linger into the start of Sunday evening, signaling the onset of more substantial weather shifts. As the strong low-pressure system approaches, clouds will increase on Monday, and temperatures are projected to continue their downward trend. By Tuesday, Valley highs are forecasted to reach only the low 70s, with some areas potentially experiencing highs in the upper 60s. This temperature drop marks a significant change, as Tuesday's daytime highs will be the coolest observed since May.
Chances for rain across the region are set to begin Tuesday night, as the system moves south along the West Coast. The first opportunities for precipitation will arrive then. Shower chances are expected to increase further on Wednesday, with a few showers possible directly in the Valley. Higher elevations anticipate more scattered activity. Lingering showers could persist into Thursday morning. The same system bringing rain to the Valley also presents opportunities for Sierra snow. Forecasts indicate 2-4 inches of snow could fall above 8,000 feet, primarily south of Highway 50. Sierra showers, and corresponding snow above 8,000 feet, may continue into early Thursday. However, there remains uncertainty regarding both the precise timing of the storm and the exact amounts of rain and snow that could ultimately fall.
Following the mid-week precipitation, conditions are expected to dry out by Thursday. Drier weather is forecasted to return for Friday and Saturday, promising a mild and pleasant end to the week. As the weather clears, Valley high temperatures are projected to warm to the mid-70s for both Friday and Saturday.