* WHAT. Flash flooding and debris flows caused by excessive rainfall are possible, especially over the Hurricane and Apache burn scars. * WHERE. A portion of southwest California, including the following areas, Cuyama Valley, Northern Ventura County Mountains, San Luis Obispo County Interior Valleys and San Luis Obispo County Mountains, including the Hurricane and Apache burn scars. * WHEN. Through this evening. * IMPACTS. National Weather Service Meteorologists are forecasting thunderstorms capable of producing heavy rainfall across the Watch area today. Rainfall rates of one-half inch per 30 minutes and one inch per hour will be possible, capable of producing flash flooding. The most-likely time period for this activity will be 12 PM PDT this afternoon through 7 PM PDT this evening. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks is possible. The thunderstorms will have the potential to impact the Hurricane and Apache burn scars during the period of the Watch. Residents near the Hurricane and Apache burn scars should prepare for the possibility of debris flows and flooding impacts. * ADDITIONAL DETAILS. - The Lake burn scar is located to the southwest of the area where the strongest thunderstorms and heaviest rainfall is expected this afternoon and evening. The Lake burn scar is currently not in the watch area, but there is some potential for this activity to drift over the burn scar this afternoon and evening. If this were to occur -- 20 percent chance -- flash flooding and debris flows could also impact the Lake burn scar. This area will be monitored closely for possible expansions to flood headlines. - http://www.weather.gov/safety/flood