“Before I knew it, it was coming over the wall,” Hoag told CNN. The wave crashed over a barrier along the Southern California beach, tossing a wall of fast-moving water at a group of onlookers who rushed to escape the deluge, video taken by Colin Hoag shows. Several people were injured by a huge wave that slammed into Pierpont in the Ventura Beach area. The first round of dangerous waves hit alongside high tide Thursday morning. Higher sea levels are making coastal flooding events worse and will continue to do so in the future. Sea levels have risen along most of the California coastline over the past century, NOAA data shows, as global temperatures climb and melt glaciers and ice sheets. Brian van der Brug/Los Angeles Times/Getty Images San Diego, Orange County, San Luis Obispo, Santa Barbara, Ventura County and San Francisco are all under high surf advisories of varying lengths.Ī Ventura County, California, fire helicopter patrols the coastline over heavy surf south of Ventura Pier on December 28. “Overall, this is expected to be an exceptional high-surf and coastal flooding event that has not occurred in many years,” the weather service in Los Angeles warned. All Ventura County beaches will be closed through New Year’s Eve because of the 15- to 20-foot waves expected along the central and Southern California coasts through Saturday evening.Ī brief dip in wave heights may occur in some locations along the California coast during the daytime Friday as one storm pushes ashore, but the danger will quickly ramp back up later Friday and Saturday as another system develops behind it. Monstrous, 20-foot-plus waves on Thursday crashed over seawalls and swept away and injured several people, forced rescues and sent a damaging surge of water through coastal California streets.ĭangerous waves continued to slam the coast on Friday, forcing beaches to close. If the radar animation of the last hours shows local thunderstorms or precipitation cells forming and disappearing in an irregular manner, then the forecast is not vey accurate.A series of powerful storms in the Pacific Ocean are driving towering waves into the California coastline, triggering flooding and posing a significant risk to people and structures along the coast. The forecast works very well when weather fronts or large organized precipitation structures are moving regularly, without disappearing or being created. ![]() Real weather is more complex than just the displacement of existing precipitation cells. Longer forecasts are not possible, as new precipitation cells are developing or existing ones are disappearing within a short time. This so called precipitation nowcast is the most accurate precipitation forecast possible but the forecast horizon is limited to about an hour. The rain/snow forecast is computed by estimating the movement of precipitation cells observed by radar and extrapolating this movement into the future. Moreover, some countries do not operate a weather radar network, and in those countries satellite data is used to estimate rainfall, which is less accurate than a realtime weather radar.Ĭalifornia: How accurate is the radar based forecast? ![]() Note that lightning is not shown on the forecast, as it cannot be predicted. Light blue indicates drizzle, blue a medium intensity, and red and yellow indicate very strong precipitation, usually associated with thunderstorms.Ĭurrent lightning strikes are marked with small orange dots on the map (Europe only). The different colours indicate the intensity of rainfall or snowfall. The radar map is updated every 5 minutes with a new radar observation. The weather radar ( California) shows where it is currently raining or snowing.
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