LOS ANGELES (CBSLA.com) — A heat wave gripping the Southland Friday could possibly produce record-breaking temperatures throughout the weekend.

A ridge of high pressure building over the Great Basin will result in very hot temperatures and gusty Santa Ana winds, according to the National Weather Service.

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Temperatures could potentially reach 20 degrees above average. Highs are forecasted to be in the 80s Friday.

On Saturday and Sunday, they are expected to range from 80s to low 90s at the coast and from the mid 80s to mid 90s in the valleys and foothills.

A wind advisory will be in effect until 3 p.m. in Los Angeles’ coastal zone, which includes beach cities, metropolitan L.A., the Hollywood Hills, both the San Gabriel and Santa Monica mountains as well as the San Fernando and Santa Clarita valleys.

NWS officials forecast winds to be between 15-25 miles per hour in the coastal zone, with gusts up to 40 mph; 20-25 mph in the mountains, gusting up to 50 mph; and 20-30 mph in the valleys, with gusts up to 45 mph.

Authorities were warning residents and visitors to stay hydrated and lower the chances of heat stress by scheduling outdoor activities in the morning or evening to avoid the day’s strongest heat. If you must engage in any strenuous activities, wear light clothing.

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Remember to never leave children, pets or elderly people alone in a vehicle.

Officials expressed concern for those taking part in Sunday’s L.A. Marathon as the high temperature along the course is forecast to be 89 degrees.

The race will begin at Dodger Stadium at 6:55 a.m. — 30 minutes earlier than originally scheduled in an attempt to beat the heat.

It will include wave starts to ensure proper runner spacing and enable more efficient replenishment of supplies at aid stations. Additional water and Gatorade Endurance Formula will be available at 24 aid stations.

Cooling buses will also be stationed along the course and at the finish line, and misting stations, cold towels and ice will also be provided.

A cooling was expected to kick in next week.

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