St. Vincent de Paul’s daytime heat relief center just south of downtown Phoenix opens at 8 a.m. Zelphya Ynzunza, who works there, says during this heat wave, there’s been a line at the door every morning.“You can just see it on their faces, like they’re overwhelmed or they just can’t wait to get in,” Ynzunza said.Ynzunza says lately, a day’s worth of cold water bottles has