Wet Weather Begins Tomorrow

An active jet stream promises to bring wet weather to our neighborhoods tomorrow through next Friday.  Seven different storm systems will crash the Bay Area.  Each storm will bring moderate to heavy rain and gusty winds. A few embedded thunderstorms are possible also. 

Localized Flash Flooding from the stronger downpours is possible.  As the week unfolds, saturated ground may lead to an Urban and Small Stream Advisory.

The graphic below is our best estimate of the potential production and impacts from these storms.

Flash Flood:   A rapid and extreme flow of high water into a normally dry area, or a rapid water level rise in a stream or creek above a predetermined flood level, beginning within six hours of the causative event (e.g., intense rainfall, dam failure, ice jam). However, the actual time threshold may vary in different parts of the country. Ongoing flooding can intensify to flash flooding in cases where intense rainfall results in a rapid surge of rising flood waters.

Urban and Small Stream Advisory:  This advisory alerts the public to flooding which is generally only an inconvenience (not life-threatening) to those living in the affected area. Issued when heavy rain will cause flooding of streets and low-lying places in urban areas. Also used if small rural or urban streams are expected to reach or exceed bank-full. Some damage to homes or roads could occur.