Riverside County Warnings, Watches and Advisories

Coastal Flood Warning issued October 28 at 11:46AM PDT until October 29 at 1:00PM PDT by NWS San Diego CA

* WHAT...For the Coastal Flood Warning, significant coastal flooding. For the Coastal Flood Advisory, minor coastal flooding expected. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...For the Coastal Flood Warning, until 1 PM PDT Thursday. For the Coastal Flood Advisory, from 1 PM Thursday to 2 PM PDT Friday. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. * ADDITIONAL DETAILS...Coastal residents and managers of infrastructure in the warned/advisory area should prepare for rising water and take appropriate action to protect life and property. Highest tides will occur around 11 AM on Thursday and noon on Friday. Observed high tides are 1.4 to 1.6 feet above astronomical tide predictions.

Coastal Flood Advisory issued October 28 at 11:46AM PDT until October 30 at 2:00PM PDT by NWS San Diego CA

* WHAT...For the Coastal Flood Warning, significant coastal flooding. For the Coastal Flood Advisory, minor coastal flooding expected. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...For the Coastal Flood Warning, until 1 PM PDT Thursday. For the Coastal Flood Advisory, from 1 PM Thursday to 2 PM PDT Friday. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. * ADDITIONAL DETAILS...Coastal residents and managers of infrastructure in the warned/advisory area should prepare for rising water and take appropriate action to protect life and property. Highest tides will occur around 11 AM on Thursday and noon on Friday. Observed high tides are 1.4 to 1.6 feet above astronomical tide predictions.

Coastal Flood Advisory issued October 28 at 11:39AM PDT until October 30 at 2:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Minor to moderate coastal flooding expected due to very high tides. * WHERE...San Luis Obispo County Beaches, Santa Barbara County Central Coast Beaches, Santa Barbara County Southwestern Coast, Santa Barbara County Southeastern Coast, Ventura County Beaches, Malibu Coast and Los Angeles County Beaches. * WHEN...Until 2 PM PDT Friday. * IMPACTS...Minor to moderate flooding of sea water is likely over vulnerable low-lying coastal areas, especially around the time of high tide, including over beach parking lots, bike paths, and harbor walkways. Moderate to significant beach erosion is likely. Isolated damage of structures due to sea water inundation is possible to the most vulnerable areas. * ADDITIONAL DETAILS...High tides will likely reach 7.5-8.0 feet (MLLW) late morning Thursday, which is 1.0 to 1.5 feet above astronomical projections. Decreasing some on Friday but still expecting near 7.5 feet (MLLW) around noon.

Coastal Flood Advisory issued October 28 at 11:39AM PDT until October 30 at 2:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Minor to moderate coastal flooding expected due to very high tides. * WHERE...Catalina and Santa Barbara Islands. * WHEN...Until 2 PM PDT Friday. * IMPACTS...Minor to moderate flooding of sea water is likely over vulnerable low-lying coastal areas, especially around the time of high tide, including over beach parking lots, bike paths, and harbor walkways. Moderate to significant beach erosion is likely. Isolated damage of structures due to sea water inundation is possible to the most vulnerable areas. * ADDITIONAL DETAILS...High tides will likely reach 7.5-8.0 feet (MLLW) late morning Thursday, which is 1.0 to 1.5 feet above astronomical projections. Decreasing some on Friday but still expecting near 7.5 feet (MLLW) around noon.

Freeze Warning issued October 28 at 10:53AM PDT until October 29 at 9:00AM PDT by NWS Eureka CA

* WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Northern Mendocino Interior, and Northern Lake. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Frost Advisory issued October 28 at 10:53AM PDT until October 29 at 9:00AM PDT by NWS Eureka CA

* WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Del Norte, Humboldt, and Mendocino Coast, Humboldt Interior, Interior Del Norte, and Southwestern Interior Mendocino. * WHEN...From 1 AM to 9 AM PDT Thursday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...Some valleys, especially closer to the coast, may experience low cloud cover and/or fog, which will limit the potential for frost.

Coastal Flood Advisory issued October 28 at 10:04AM PDT until October 28 at 3:00PM PDT by NWS Eureka CA

* WHAT...High astronomical tides will cause minor flooding in low lying areas around Humboldt Bay. Up to one half foot of saltwater inundation above ground level is possible near shorelines and tidal waterways. Between 9.0 and 9.3 feet MLLW at the North Spit tide gauge is predicted. * WHERE...Northern Coastal Humboldt County. * WHEN...From noon to 3 PM PDT Wednesday. High tide is at 1:13 PM at the Humboldt Bay North Spit tide gauge. Saltwater inundation will be possible 1 to 2 hours before and after high tide. * IMPACTS...Flooding of low lying areas around Humboldt Bay including parks and roads with only isolated closures expected. Flooding will likely impact Jackson Ranch Road in the Arcata Bottoms and several roads in King Salmon.

Coastal Flood Advisory issued October 28 at 12:20AM PDT until October 30 at 5:00PM PDT by NWS San Francisco CA

* WHAT...Up to 1.9 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...Pacific Coast. * WHEN...Until 5 PM PDT Friday. * IMPACTS...High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restricting escape from beaches and coastal areas. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be 1.9 ft above normal (7.7 ft MLLW) at 12:56 PM Wednesday 10/28, 1.7 ft above normal (7.5 ft MLLW) at 01:43 PM Thursday 10/29, and 1.6 ft above normal (7.4 ft MLLW) at 02:39 PM Friday 10/30. These predictions include up to 1.2 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.

Coastal Flood Advisory issued October 28 at 12:20AM PDT until October 31 at 6:00PM PDT by NWS San Francisco CA

* WHAT...Up to 1.9 ft of inundation above ground level is possible in low-lying areas near shorelines and tidal waterways. * WHERE...Bay Shoreline locations of San Pablo Bay, San Francisco Bay, and Monterey Bay. * WHEN...Until 6 PM PDT Saturday. * IMPACTS...High tides will result in flooding of low-lying infrastructure, isolated road closures, and coastal erosion. Rising tides will bring water and waves farther up the beach than normal, restricting escape from beaches and coastal areas. More substantial impacts are expected along bayshore Marin County where increased flooding is anticipated across low lying areas. * ADDITIONAL DETAILS...At the San Francisco tidal gauge, high tide is expected to be 1.9 ft above normal (7.7 ft MLLW) at 12:56 PM Wednesday 10/28, 1.9 ft above normal (7.7 ft MLLW) at 01:43 PM Thursday 10/29, 1.6 ft above normal (7.4 ft MLLW) at 02:39 PM Friday 10/30, and 1.1 feet above normal (6.9 ft MLLW) at 03:44 PM on Saturday 10/31. These predictions include up to 1.2 ft of surge that will enhance the astronomical tide and flooding threat. High tide varies up to 90 minutes earlier or later along the Pacific Coast and through the San Francisco Bay, respectively.

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 Riverside County.

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