Exceptionally high tides are anticipated along the Los Angeles and Orange County coastlines this week, presenting a heightened risk of coastal flooding, beach erosion, and localized property damage. These tides, which began Monday and are expected to continue through Wednesday, could approach or even break historical records, according to the National Weather Service. This regional development is relevant to the island community due to shared coastal dynamics and mainland connections.
Forecasters with the NWS predict morning tides ranging from 7.5 to 8 feet along the Los Angeles County coastline. These levels are running significantly above astronomical predictions, with tides estimated to be about 1 to 1.7 feet higher than predicted in Orange County and roughly 1 to 1.5 feet above predictions along the Los Angeles County coastline. The National Weather Service stated that “Monday through Wednesday could produce the highest on record,” potentially challenging the existing record at San Pedro, where a high tide of 7.93 feet was recorded on January 10, 2005. Records for that specific location date back to 1924, highlighting the unusual nature of the current forecasts.
A coastal flood warning remains in effect for the entire Orange County coastline until 1 p.m. Thursday. Concurrently, a coastal flood advisory is active for the Los Angeles County coastline, also until 1 p.m. Thursday. These alerts underscore the ongoing potential for hazardous conditions in vulnerable low-lying areas.
Minor coastal flooding is considered likely in several susceptible areas across the mainland, including harbor walkways, beach parking lots, bike paths, and sections of normally sandy beaches. The NWS indicates that more significant flooding and damage are possible in locations where little to no sandy beach remains, or in areas that have already experienced problems from previous high tides. In recent weeks, areas such as Long Beach, Malibu, and Newport Beach have already reported substantial damage to homes as a result of high surf, suggesting a heightened vulnerability to the current conditions.
The anticipated high tides are also expected to disrupt essential rail service along the Orange County coastline. Metrolink Orange County Line service began suspension on Monday between the Laguna Niguel/Mission Viejo and Oceanside stations. This suspension is slated to continue through Friday, with trains originating and terminating solely at the Laguna Niguel/Mission Viejo Station for the duration of the affected period. This can impact travel and logistics for those who commute or rely on rail connections to and from the mainland.
Away from the immediate coastal areas, the general weather pattern for Los Angeles and Orange counties is expected to remain dry and warm through Monday, characterized by mostly clear skies and generally weak winds. However, a shift is anticipated starting Tuesday, with a gradual return of onshore winds. This change is projected to bring slightly cooler temperatures and an increasing marine layer along the coast, offering some relief from the warmer conditions.
Looking further ahead, forecasters are monitoring another storm system that could reach Southern California by late Thursday or Friday. This system has prompted predictions of a “wet and unsettled Halloween weekend for Southern California.” There is high confidence among forecasters that measurable rain will fall across most, if not all, of the region between Friday and the weekend, although the precise timing and total rainfall amounts currently remain uncertain. Initial estimates suggest rainfall totals could range from one-half inch to 2 inches, but forecasters caution that actual amounts could be higher or lower depending on how the storm develops over the coming days. This potential for significant rain following high tides adds another layer of complexity to the region's weather outlook.
