All-Time Record Highs Tied or Broken in Six Southern California Locations Friday

July 7, 2018

Southern California will continue to see blistering heat Saturday after daily, monthly, even a few all-time record highs were smashed Friday.

A dome of high pressure will build over the West by late this week, resulting in hot conditions.

A large dome of high pressure in the upper atmosphere has expanded into the Southwest U.S. Sinking air underneath this high-pressure system will contribute to hot temperatures across a large area, producing record highs in Southern California.

(MORE: Current Temperatures)

At the same time, the area of high pressure will help to draw increasing monsoonal moisture into the Desert Southwest, contributing to an uptick in showers and thunderstorms.

Record Heat in Southern California

According to the National Weather Service, six locations tied or set new all-time record highs Friday.

  • Riverside: 118 (tied previous record from July 17, 1925)
  • Ramona: 117 (records only since 1974; crushed previous record from Aug. 31, 2017 by 6 degrees)
  • Van Nuys: 117 (only a 24-year period of record)
  • Burbank: 114
  • Santa Ana: 114 (topped previous record that had stood since June 14, 1917)
  • UCLA: 111 (topped previous record of 109 degrees set on Sep. 20, 1939)

Other notable records Friday included: 

  • Long Beach: 111 - warmest July day on record
  • Downtown Los Angeles: 108 - daily record (beat the old record by 14 degrees)
  • Santa Barbara: 101 - daily record
  • San Diego: 96 - daily record
  • Oxnard: 86 - daily record

Saturday will feature yet another day of extreme heat, even at the beaches of Southern California, and more record highs will be within striking distance.

Triple-digit highs are again expected in Los Angeles Saturday, which should surpass the daily record high for the day.

San Diego will have high temperatures in the low to mid-80s Saturday. These highs will be below record levels, but some inland lcoations will still be in the 90s to near 100 degrees. 

Forecast Highs

Valleys just inland from the Southern California coast will, of course, be hotter.

Gusty winds in combination with the hot, dry weather in Southern California will also increase the wildfire danger in the region.

(MORE: Western Wildfires)

Hot temperatures will extend across the Desert Southwest and Great Basin, including Phoenix, Las Vegas, Salt Lake City and Boise, Idaho.

The National Weather Service issued excessive heat warnings for parts of southern Nevada and Southern California. This means heat-related illnesses are likely for those spending prolonged time outdoors, as well as those more vulnerable, such as children and the elderly.

Heat Alerts

Southwest Monsoon Kicks into Gear

When strong high-pressure systems set up in the vicinity of the Rockies and the adjacent High Plains in July, it typically signals the wet phase of the Southwest monsoon is about to begin.

This weekend, an easterly wind flow on the southern periphery of the hot high-pressure system over the West will send mid-level moisture into the Desert Southwest. In addition, low-level moisture from the Gulf of California will surge toward the region.

The green, yellow and orange shadings represent greater amounts of moisture in the atmosphere. This moisture will move into the Southwest Thursday through Sunday.

As a result, we will see an increase in showers and thunderstorms in the Desert Southwest by this weekend, likely continuing into next week.

Those thunderstorms could produce blowing dust, strong winds, locally heavy rain and dangerous lightning. Furthermore, the increased moisture will drop temperatures closer to average in Arizona by late in the weekend.

(MORE: Southwest Monsoon Typical Impacts)

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