San Francisco, CA

Light to Moderate Rain Showers Forecasted for San Francisco

Bryan Dijkhuizen

According to the forecast, a dangerous weather trend is expected to persist over the holiday weekend and into the following week after that.

During that period, expect bouts of light to moderate rain to occur intermittently as a series of waves of precipitation travel across the area.

This morning, it was discovered that a mature low-pressure system was positioned in the northeast Pacific with an associated frontal zone that extended about 150-200 miles equatorward west of the California Central Coast.

As indicated by precipitable water values ranging from 0.8 to 1.0 inches, this frontal feature was accompanied by a thin ribbon of mild lower to mid-tropospheric moisture in the lower to middle troposphere.

Mid- to high-level clouds were rising in this moist warm advection environment, with light to moderate rain showers approaching on the far northern California coast as a result.

As the weakening surface front approaches the San Francisco Bay Region, anticipate the low-pressure area to progressively occlude over the northeast Pacific today and tomorrow, according to forecasts. The leftover trough should gradually move southward along the Central Coast through Wednesday morning.

While the front will weaken over time, there should be enough lift to allow a scattered band of showers to sweep throughout the region today and into tonight, with light to sometimes moderate rain rates.

The amount of cloud cover present should influence today's temperatures. In general, the North Bay should be cloudy and coolish, with highs in the lower 50s, while highs in the upper 50s and lower 60s are most common in the surrounding areas.

If there is enough sunshine early in the day, temperatures in some warmer southern valleys may even reach the mid to upper 60s. Because of the extensive cloud and rain coverage expected on Wednesday, expect temperatures to be a little colder throughout the region.

According to the forecast, the lows tonight and Wednesday night should be in the 40s to lower 50s.

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