Photo by John Schreiber.
Photo by John Schreiber.

Waves of between six and 10 feet will pound beaches in Los Angeles and Orange counties Tuesday, forecasters said, and a high surf advisory will be in effect until 6 p.m.

The dangerous waves could be even more of a concern as the Southland’s mini-heat wave continues, drawing people to local beaches that expect high temperatures of about 79 Tuesday.

Downtown Los Angeles and other inland areas will see the mercury climb to 82 for this December day. However, a cooling trend will begin Wednesday and by Thursdayt temperatures will be in the 60s with even a chance of rain by Friday.

Tuesday’s high surf results from a long-period west-northwest swell.

“Strong rip currents and long shore currents will create dangerous swimming conditions,” warned a National Weather Service statement. “Minor coastal flooding will be possible near times of high tide on Tuesday morning.”

High tide of nearly six feet is expected in Los Angeles at 6:50 a.m. Tuesday.

The high surf began Monday — the first such episode this week.

“A prolonged-duration of high surf is possible from Thursday through Sunday… This second event has the potential to bring even higher surf conditions, along with more widespread coastal flooding and beach erosion,” the NWS statement said.

The surf pounding the Central Coast will be heavier than in L.A County.

Forecaster said the rip currents resulting from the high surf pose a strong risk to swimmers.

“If caught in a rip current, swim parallel to shore until you are free of the powerful current,” urged the NWS statement. “Always swim near a lifeguard.”

Off the coast, a small craft advisory was in effect to indicate hazardous wind and sea conditions, which are especially threatening to inexperienced sailors in small boats, forecasters said. It was intended to be in force until 3 a.m. Wednesday in some areas and 4 a.m. Thursday in others.

Also in today’s forecast are mild temperatures.

The NWS forecast sunny skies in Orange County Tuesday, partly cloudy skies in Los Angeles County, and highs of 70 in Palmdale; 71 in Lancaster; 73 in Newport Beach; 74 in Laguna Beach and San Clemente; 75 on Mount Wilson; 76 in Avalon; 78 in Irvine; 79 in Saugus, Anaheim and Mission Viejo; 80 at LAX and in Fullerton; 81 in Yorba Linda; 83 in San Gabriel, Long Beach and downtown L.A.; 84 in Pasadena and Burbank; and 86 in Woodland Hills.

In most communities — not in the Antelope Valley — temperature will go down Wednesday and do so again Thursday. Partly cloudy skies are forecast for Wednesday and showers on Thursday, Friday and Sunday amid temperatures in the 60s.

—City News Service

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