March 30, 2021 1:52 pm UV Index: Why Does It Change Throughout the Year? How do UV rays change throughout the year and why is it possible to get a sunburn even when it’s cloudy? NBC 7 Meteorologist Sheena Parveen has everything you need to know about the UV index. US & World Videos 3:56 What to know if you're flying out of Tijuana 3:28 Female pilots at MCAS Miramar inspire women to pursue aviation careers 2:46 Candidates face off in race for San Diego's 51st Congressional district 2:38 Estimated 423 people are living along the San Diego Riverbed 2:22 Building safety concerns prompt Encinitas firefighters to temporarily relocate