Redlands and Loma Linda to Get Hotter Over Next 50 Years: UCLA Researchers

Redlands, Loma Linda and the rest of Southern California are expected to heat up over the next 50 years, with more 95-plus degree days in store, according to a new UCLA report compiled with forecasting models generated by a supercomputer.

According to the study, Redlands currently averages 12.3 days a year with temperatures of 95 and above. That number is expected to more than triple by the year 2041 to 40.7 days a year of 95 or hotter.

The study shows "climate change will cause temperatures in the Los Angeles region to rise by an average of 4 to 5 degrees Fahrenheit by the middle of this century, tripling the number of extremely hot days in the downtown area and quadrupling the number in the valleys and at high elevations," according to a UCLA announcement.

The study, which contains data 2,500 times more detailed than previous studies, predicts weather patterns from 2041 to 2060.

Data in the study covers Los Angeles County, Orange County and parts of Ventura, San Bernardino and Riverside counties, reaching as far east as Palm Springs, according to UCLA.

It shows that the number of days with temperatures exceeding 95 degrees will increase.

The hottest days are likely to break records, said Alex Hall, lead researcher on the study by UCLA's Institute of the Environment and Sustainability. The current record high for downtown is 113 degrees, set on Sept. 27, 2010. Temperatures are predicted to rise 3.7-5.4 degrees across the region by 2050. The hottest days will likely be in the summer and the fall.

"Every season of the year in every part of the county will be warmer," Hall said. "This study lays a foundation for the region to confront climate change. Now that we have real numbers, we can talk about adaptation.''

The study was done with a supercomputer and it contains the most precise predictions for how climate change will affect the Los Angeles area's micro climate zones - deserts, coastal areas and mountains. The micro climates are just 2 1/4 square miles.

"This is the best, most sophisticated climate science ever done for a city," said UCLA Professor Paul Bunje, executive director of UCLA’s Institute of the Environment and Sustainability Center for Climate Change Solutions. "Nobody knew precisely how to adapt to climate change because no one had the data - until now."

The city of Los Angeles commissioned the $500,000 study, which was paid for by the U.S. Department of Energy.

"UCLA's model projects climate changes down to the neighborhood level, allowing us to apply the rigor of science to long-term planning for our city and our region," Los Angeles Mayor Antonio Villaraigosa said in a statement. "With good data driving good policies, we can craft innovative solutions that will preserve our environment and quality of life for the next generation of Angelenos."

A main concern the study reaffirms is the sustainability of the Los Angeles region's water resources. The region is dependent on snowfall and precipitation in the local mountains. Another study on local water resources will be released in the fall, and another study on snowpack in the Sierra Nevada range will come out in the summer of 2013.

Another regional concern is the risk of heat stroke and other heat-related maladies.

"Higher temperatures bring higher health risks," Dr. Richard Jackson of the Fielding School of Public Health at UCLA said. "Longer, harsher heat waves will cause more cases of heat stroke and heat exhaustion - even among otherwise healthy people who believe they’re immune - and higher temperatures mean more smog, with consequences for respiratory health as well."

Titled "Mid-Century Warming in the Los Angeles Region," the study and more background are at this link.