A coastal flood warning has been issued for the entire Orange County coastline, effective until 1 p.m. Thursday, as exceptionally high tides are anticipated. These tides, expected to approach or break records along the Southern California coast, began on Monday, increasing the threat of coastal flooding, beach erosion, and isolated property damage. The National Weather Service (NWS) indicated that the period from Monday through Wednesday could produce the highest tides on record.
Forecasters noted that tides in Orange County are currently running approximately 1 to 1.7 feet above astronomical predictions. While specific Orange County tide height records were not detailed in the NWS statement, the warning implies significant water levels. For comparison, the NWS indicated that tides along the Los Angeles County coastline were expected to range from 7.5 to 8 feet in the mornings, with the potential to challenge the San Pedro record of 7.93 feet, set on January 10, 2005. Records for that location date back to 1924, providing historical context for the current conditions.
The high surf conditions in recent weeks have already resulted in substantial damage to homes in areas including Newport Beach. The NWS forecasts that minor coastal flooding is likely to impact vulnerable low-lying areas across Orange County. These areas include harbor walkways, beach parking lots, bike paths, and normally sandy beaches. More significant flooding and property damage are considered possible in locations that have little to no remaining sandy beach or where prior high tides have already caused issues.
In response to the anticipated high tides along the Orange County coastline, Metrolink has announced a disruption to its rail service. The Metrolink Orange County Line service began suspension on Monday between the Laguna Niguel/Mission Viejo and Oceanside stations. During this period, trains on this line will originate and terminate at the Laguna Niguel/Mission Viejo Station. This service alteration is scheduled to continue through Friday.
Beyond the immediate coastal concerns, dry and warm weather conditions are expected to persist across both Los Angeles and Orange counties through Monday, characterized by mostly clear skies and generally weak winds. A gradual shift in weather patterns is projected to begin on Tuesday, with the return of onshore winds. This change is expected to bring slightly cooler temperatures and an increasing marine layer along the coast.
Looking further ahead, forecasters from the NWS have indicated the possibility of another storm system reaching Southern California late on Thursday or Friday. This system could lead to a "wet and unsettled Halloween weekend for Southern California." The NWS has expressed high confidence that measurable rain will fall across most, if not all, of the region between Friday and the weekend. However, the exact timing and the total amount of rainfall remain uncertain at this time. Initial estimates suggest potential rainfall totals could range from one-half inch to 2 inches, but forecasters have cautioned that actual amounts could vary, being either higher or lower, as the storm develops and its trajectory becomes clearer.
