Orinda Warnings, Watches and Advisories

When a severe thunderstorm warning is issued, the storm may produce damaging winds, large hail, dangerous lightning, and heavy rain. In some cases, heavy rainfall produced by a severe storm can also lead to flash flooding. Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Orinda.

Use the Radar Maps link provided to understand the trajectory of a storm.

Coastal Flood Advisory issued August 11 at 11:14PM PDT until August 13 at 2:00AM PDT by NWS San Francisco CA

* WHAT...Up to 1.4 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...Bayshore locations along the San Francisco Bay, San Pablo Bay, and Monterey Bay. * WHEN...Until 2 AM PDT Thursday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be 1.4 ft above normal (7.24 ft MLLW) at 11:49 PM Wednesday 8/12. These predictions include both astronomical tides and roughly 3-6 inches of additional water mainly from a combination of thermal expansion and accumulated sea level rise since the tidal datum was established (1983- 2001). High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.

Flood Watch issued August 11 at 2:22PM PDT until August 13 at 9:00PM PDT by NWS Reno NV

* WHAT...Flash flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of east central California, including the following area, Mono County and western Nevada, including the following area, Mineral and Southern Lyon Counties. * WHEN...From Wednesday afternoon through Thursday evening. * IMPACTS...Excessive runoff may result in rock, mud, and debris flows in and near steep terrain, and poorly drained urban areas. * ADDITIONAL DETAILS... - Heavy rain from thunderstorms primarily during the afteroon and evening hours Wednesday and Thursday. - http://www.weather.gov/safety/flood

Coastal Flood Advisory issued August 11 at 1:56PM PDT until August 13 at 12:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Minor coastal flooding expected during the evening high tides. * WHERE...Santa Barbara County Southwestern Coast, Santa Barbara County Southeastern Coast, Ventura County Beaches, Malibu Coast and Los Angeles County Beaches. * WHEN...Until midnight PDT Wednesday night. * IMPACTS...Flooding of sea water is likely, around the time of high tide, over vulnerable low-lying coastal areas such as parking lots, beaches, and walkways. Significant damage to roads or structures is NOT expected. * ADDITIONAL DETAILS...Coastal flooding concerns will peak each evening between about 8 PM and 10 PM due to astronomical high tides of 7.3 to 7.5 feet.

Coastal Flood Advisory issued August 11 at 12:07PM PDT until August 12 at 11:00PM PDT by NWS San Diego CA

* WHAT...Minor coastal flooding expected during the evening high tides. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Flooding of low lying parking lots, parks, and roads. * ADDITIONAL DETAILS...High tides of 7.2 to 7.5 will peak each evening between 7:30PM-10PM due to astronomical high tides.

Fire Weather Watch issued August 11 at 10:19AM PDT until August 13 at 9:00PM PDT by NWS Reno NV

The National Weather Service in Reno has issued a Fire Weather Watch for thunderstorms and strong outflow winds, which is in effect from late Wednesday night through Thursday evening. * Affected Area...Fire Weather Zone 270 Surprise Valley California, Fire Weather Zone 271 Western Lassen, Eastern Plumas, and Eastern Sierra Counties, Fire Weather Zone 272 Greater Lake Tahoe and Truckee Area, Fire Weather Zone 278 Eastern Lassen County, Fire Weather Zone 458 Northern Washoe County. * Thunderstorms...Thunderstorm chances increase to 15 to 30 percent for Thursday leading to lightning strikes on dry fuels. Thunderstorms may also produce hail and periods of moderate to heavy rainfall. * Outflow Winds...Up to 50 mph. * Impacts...Lightning can create new fire starts and may combine with strong outflow winds to cause a fire to rapidly grow in size and intensity before first responders can contain them.

Fire Weather Watch issued August 11 at 9:57AM PDT until August 13 at 9:00PM PDT by NWS Sacramento CA

The National Weather Service in Sacramento has issued a Fire Weather Watch for thunderstorms and strong outflow winds, which is in effect from late Wednesday night through Thursday evening. * Affected Area...Fire Zone 130 Sierra (Tehama-Plumas) Above 3000 ft, Fire Zone 132 Sierra (Yuba-Placer) 3000-5000 ft, Fire Zone 133 Sierra (Sierra-Placer) Above 5000 ft, Fire Zone 135 Sierra 3000-5000 ft, Fire Zone 136 Sierra (El Dorado-Amador) Above 5000 ft, Fire Zone 138 Sierra (Cal-Tuo) 3000-5000 ft and Fire Zone 139 Sierra (Cal-Tuo) Above 5000 ft. * Thunderstorms...Isolated to scattered coverage of a mix of wet and dry thunderstorms expected. Lightning strikes may also occur outside of main precipitation cores. * Outflow Winds...Gusty and erratic outflow winds could occur near any thunderstorm development. * Impacts...Lightning can create new fire starts and may combine with strong outflow winds to cause a fire to rapidly grow in size and intensity.