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SAN DIEGO (KGTV) — Santa Ana winds have fueled the most destructive wildfires in San Diego’s history, including the Cedar Fire in 2003 and the Witch Creek Fire in 2007.But why do Santa Anas form and what makes them so effective at spreading fire?Typically, during the day, San Diego’s winds blow from the ocean to the shore. These onshore winds tend to carry a lot of water vapor.However, Santa Ana winds blow the opposite direction, from the east to the west, and they have all the ingredients fires need to spread.“Strong winds,” said National Weather Service San Diego meteorologist Philip Gonsalves. “They’re typically very dry, and we usually end up with warmer conditions.”Strong. Dry. Hot. A fourth key factor elevating the fire danger is the timing of this wind pattern.“They typically occur in the fall, which is that time of the year when the fuel moistures are very low, and so the fuels are primed for ignition,” Gonsalves said.Winds flow from areas of high pressure to areas of low pressure. Santa Anas form when there is high pressure over the Great Basin, located in Nevada and parts of Utah, and low pressure over Southern California.The winds are coming from the desert, but that’s not why they’re hot. They are hot for the same reason that air coming out of a bicycle pump is hot, Gonsalves said. It’s because the air is getting compressed.As the winds flow west out of the Great Basin, they travel over mountains. At high elevations, the air is very cool, but as the winds move downslope into lower elevations where the pressure is higher, the air gets compressed. That compression rapidly drives up the temperature in what’s called the Adiabatic Process.This process also dries out the air, and dry air can heat up much faster.As the winds move downslope, they pass over ridges and through canyons, which act like funnels, speeding up the winds.Santa Ana winds can pop up any time the Great Basin is cooler than Southern California, typically from September to May. But peak season is considered to be October.The Santa Ana event on Tuesday is falling a little before the peak season because of the positioning of highs and lows in the Northern Hemisphere, Gonsalves said, but the end result is the same: strong, dry, warm winds and extreme fire danger. 2281

SAN DIEGO (KGTV) — Saturday's winning Powerball numbers are: 08, 12, 13, 19, 27 and the Powerball is 4.Saturday's Powerball drawing will be for an estimated 0 million, with a cash option of 8.6 million. While the Mega Millions craze has come and gone, Saturday's jackpot would still be the fourth largest in the history.Much like the Mega Millions prize, the Powerball jackpot has climbed since Aug. 11, after a winning ticket in Staten Island, New York, raked in 5.6 million. Since then, there have been 21 drawings without a jackpot winner.RELATED: No winner in Wednesday's Powerball drawing, jackpot increases to 0 millionThe odds of winning the Powerball jackpot are 1 in 292.2 million. Each ticket is .If you don't win the big prize, there's still a chance to win something. Matching the Powerball is worth at least and matching every number but the red Powerball is worth at least million. And maybe you will strike it rich. In San Diego, one ticket matched five of six numbers during this week's record-setting Mega Millions drawing, worth 2,472.Or if you have about 90 friends, pool together some cash and buy up a boatload of tickets, like these friends in Florida — though, it's safe to assume they lost more than they raked in. 1289

SAN DIEGO (KGTV) -- San Diego State University will begin testing all students who live on campus for COVID-19, the school said Tuesday.According to the university, the testing will start on September 16. After the initial phase of testing, the school will begin testing students at random. “Following the initial phase of benchmark testing for all students in residence this week, we will then launch random testing for the on-campus housing population. During each round of testing, a set of individuals from each residential community group will be randomly sampled to be re-tested,” the school said.The news comes as 648 students tested positive or presumptive positive for the virus.According to SDSU, 644 students have so far tested positive for the virus. Four students are presumptive positive.So far, no faculty or staff have tested positive for coronavirus. 875

SAN DIEGO (KGTV) - San Diego Police searched Friday for a very tall man who robbed a Hillcrest bank with a semi-automatic handgun. The man walked into the California Bank and Trust at 3737 Fifth Avenue about 9:15 a.m., police said. Officers said the man demanded money from a teller who gave him cash, then he ran from the bank. A witness said the man dropped some of the money as he fled the area. No injuries were reported. Police said the man is black, 6’5” tall, and 220 pounds. He was last seen wearing a fisherman's hat, dark sunglasses, a dark colored hoodie, and khaki pants. Anyone with information is asked to call San Diego FBI at 858-320-1800 or Crime Stoppers at 888-580-8477. 697

SAN DIEGO (KGTV) -- Some students in the San Diego Unified School District are being allowed to return to campus Tuesday as the district begins the first phase of its reopening plan.The district began the 2020-21 school year on Aug. 31 with a distance learning program for its students. In recent weeks, during the distance learning period, teachers have been working to determine which students they believe would benefit from appointment-based in-person learning sessions.Appointment sessions will be voluntary; the rest of the time, those students will continue with distance learning.SD Unified officials said they’ve also been working with health experts in designing a reopening plan that would ensure all students and staff are safe.Despite the reopening plan, there are some parents who still do not believe it’s enough.On Tuesday afternoon, a group of parents called Reopen SDUSD has scheduled a rally at 4 p.m. in front of the Board of Education building to voice their concerns about the reopening plan.The group, which held a similar rally last month, is calling for a more detailed reopening plan and they want the district to be more transparent.Reopen SDUSD has gathered thousands of signatures for a petition urging the district to allow more students to return to campus.ABC 10News spoke with some parents at the September rally who said they want options because distance learning is not working for them.One mother said her children “dread going on Zoom. They dread being on the computer. They don’t like learning via the screen. They’re just losing a lot of interest, and I end up having to yell at them, ‘Do your work!’ And it’s frustrating because it impacts our relationship in a negative way.” 1725