At Jitterbugs, everybody's Meta-Human Warning App goes off prior to the arrival of Deathstorm and Killer Frost. It was proven at the police station that Earth-1 Barry (a meta-human) can set off these apps as well, yet he does not at Jitterbugs.
Barry flashes about in his doppelganger's street clothes yet his speed friction doesn't set these pedestrian threads on fire (not even producing a little smoldering).