First-order effects

• Zello's user base jumps by 6M in roughly a week, with the company explicitly positioning the app around Wi-Fi and cell service as Irma approaches — meaning its servers and channel structure now carry live hurricane-coordination traffic, not just casual chat.
• Volunteer rescue groups like the Cajun Navy gain a much larger pool of nearby users to pull into their channels, expanding who can be reached during the next storm.

Second-order effects

• Because Zello depends entirely on Wi-Fi and cell service, its failure mode in a blackout pushes demand toward network-independent alternatives like the mesh-network alert app IBM built with The Weather Company, which was designed specifically for when cellular networks are down.
• An influx of millions of users onto open, channel-based voice rooms hands Zello a moderation problem it has not staffed for — the same open-channel design that aids rescuers also lets anyone broadcast, a burden that grows with every crisis spike.

Third-order effects

• If each disaster converts another wave of civilians into channel-based voice users, Zello drifts from novelty app toward de facto emergency infrastructure — a role later visible in its admission that it ignored terrorism-related channels and in Venezuelans using channels to find food and medical supplies — without the reliability guarantees or oversight that role implies.
• The pattern points toward a split in crisis communications: official alert systems on one side, and self-organized volunteer networks running on consumer apps on the other, with regulators eventually forced to decide which layer they treat as critical infrastructure.