Bay Area Set for Intense 24-Hour Downpour Equivalent to a Month’s Rainfall – Detailed Timeline Inside

The Bay Area is bracing for an intense 24-hour downpour, expected to deliver nearly a month’s worth of rain to San Francisco, according to the National Weather Service.

Weather Forecast for the Bay Area

Meteorologist Dalton Behringer forecasts heavy rainfall starting from late Monday morning, continuing throughout the evening. Key areas will experience significant rainfall periods during specific times.

Rainfall Across the Region

• North Bay: Anticipates approximately 0.5 inch of rain. The main downpour is expected between 11 a.m. and 4 p.m. on Monday.
• San Francisco: Set to receive 0.82 inch of precipitation, with 90% falling between 1 p.m. and 5 p.m., coinciding with the evening commute.
• Oakland: Rainfall of around 0.8 inch is expected, mostly between 11 a.m. and 5 p.m. Showers may also persist into early Tuesday.
• East Bay (Walnut Creek): Forecasted to experience 0.88 inch of rain, with heavy periods before 5 p.m.
• Santa Cruz Mountains: Could see totals up to 1.5 inches, particularly before 11 p.m. on Monday.

Post-Downpour Conditions

As the main rain event subsides, the Bay Area will continue to have chances of showers into Tuesday. Morning and overnight conditions are likely to bring scattered or isolated showers, with regions generally receiving less than a tenth of an inch of additional rain. A few areas might gain as much as an extra quarter inch.

Historical Context and Impact

Typically, October is a dry month in San Francisco, with an average of 0.94 inches of rain. This storm is set to deliver nearly all of October’s average precipitation in a single day, though substantial flooding is not expected.

Meteorologist Behringer notes that such rainfall in October, while significant, is not unprecedented.