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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) — San Diego State University has extended its stay-at-home order for on-campus students until Sept. 14 at 9 a.m., university officials announced on Monday.SDSU said they have seen "significantly reduced activity" in the College Area over the Labor Day weekend thanks to the current order. The order was originally scheduled to expire on Tuesday at 6 a.m.On Sunday, the college reported 286 confirmed or probable COVID-19 cases among on- and off-campus students, an increase of more than 100 cases since Friday.RELATED:San Diego State coronavirus cases continue to rise during 'stay-at-home' orderSDSU reports 120 more COVID-19 cases since fall startSan Diego State moves all classes online for 4 weeks as student cases riseSDSU students told to stay at home over Labor Day Weekend as coronavirus cases increaseThe college says that COVID-19 cases have remained relatively low compared to other universities of the same size across the nation."Some students who have tested positive have fully recovered and are no longer symptomatic. Also, SDSU has no reports of any hospitalizations as a result of any positive cases. However, the COVID-19 risk remains within our community, and researchers are still trying to understand potential rebound illness for those who have tested positive but have since recovered," the school said.The extension of the stay-at-home order for on-campus students asks that they stay at the current residences except for essential needs, like medical care, food, exercising, work, or shopping for essentials.With Monday's announcement, a COVID-19 Advisory was also extended until the same time for students living in the College Area. Off-campus students are asked to maintain physical distance and avoid any gatherings.Students can call 2-1-1 or their medical providers and stay home if they become ill. They may also contact Student Health Services at 619-594-4325 (Monday through Friday) or the Nurse Call Line at 858-225-3105 (after hours and during weekends and holidays). Testing is available by appointment only and can be scheduled online here. 2103

SAN DIEGO (KGTV) - San Diego State University students are being warned to look out for a man who fondled a woman on campus this week.An unknown man approached a woman near the campus's music building as she was walking to Campanile Walk Thursday just before 9 p.m., according to SDSU campus police.Police said the man told the woman how pretty she was and tried to hug her. The woman tried to walk away twice and the man tried to hug her twice. police said.The man the groped the woman's buttocks. Police said the woman walked away to the Aztec Student Union and the man followed her there, before walking away.Police described the man as a Black man, about 40-years-old, standing 5-feet 7-inches tall, and was last seen wearing a brown flannel shirt and a yellow, red, and green beanie.Anyone with information is asked to call SDSU Police at 619-594-1991 or Crime Stoppers at 888-580-8477. 919

SAN DIEGO (KGTV) - SDG&E has gained full control of a gas leak that prompted evacuations and shut down SR-163 and Friars Road throughout the day Wednesday. All evacuations were lifted and roadways in the area reopened just before 8 p.m. following daylong evacuations and closures. Crews said they would begin assessing damage and working to fix the gas line overnight Wednesday. UPDATE - SR-163 both NB and SB between I-805 and I-8, including all ramps and connectors, have been reopened to traffic. #SDCaltransAlert— Caltrans San Diego (@SDCaltrans) March 8, 2018 596

SAN DIEGO (KGTV) — Santa Ana winds and low humidity will bring fire danger to San Diego County this week.Relative humidity is down to 10% to 15% in the county, according to the National Weather Service San Diego, causing localized fire weather conditions through Tuesday ahead of moderate to strong Santa Ana winds peaking on Thursday.The high wind weather is expected to last Wednesday night into Friday, the NWS said. Winds will gradually weaken next weekend, but dry air will remain in the county."It is already starting out dry preceding this next event which is not good," the NWS wrote. "Relative humidity will plummet further and by Thursday, single-digit and teen relative humidity could drive all the way to the coast."The county can expect to see temperatures steadily rise 5 to 10 degrees above normal west of the mountains and about 3 to 6 degrees above normal elsewhere into Tuesday, NWS says.Despite this, cooler temperatures will work their way into the county overnight."Nights will remain cool, especially for the wind-sheltered areas. Local breezy conditions will continue below the passes and on the coastal slopes of the mountains each night and morning," NWS said. 1193

来源：资阳报