The phone alert that jolted much of the East Bay and South Bay awake around 7 a.m. Saturday did what it was designed to do: within a couple of hours, 6-year-old Deleyah Mendoza — taken from Newark the night before — was found safe and back with her mother.

By breakfast, the Reddit threads were full of the same startled question — "Anybody else get woken up by the Amber Alert?" The short answer is that a lot of people were, by design. California's Amber Alert didn't blanket the whole Bay at random; the California Highway Patrol geo-targeted it to two of the region's most populous counties. This is a rare case where the much-cursed 7 a.m. phone scream is easy to defend — it ended with a child found alive — and a useful moment to explain why these alerts reach so far, especially set against the alerts that never fire at all.

The California Highway Patrol issued the Amber Alert on Saturday morning on behalf of the Newark Police Department, and deactivated it a few hours later once the girl was located (external source, opens in a new tab), CBS Bay Area reported. Deleyah Mendoza, 6, had last been seen the night before, Friday around 11:30 p.m., near Baine Avenue and Cherry Street in Newark.

By mid-morning she was safe. A Newark Police Department spokesperson told Patch's Fernando Haro (external source, opens in a new tab) that the child had been found and returned to her mother, Shobna Sharma, and that detectives were still digging into what happened — including, the spokesperson said, "the involvement of the child's father." The department declined to say more while the case stays open, and would not confirm whether the named suspect — 24-year-old Donovan Blair, reportedly last seen in a gray 2009–2011 Honda Insight — had been arrested. Police have not described what relationship, if any, Blair had to the girl.

Those are the facts mainstream outlets carried. The part worth sitting with is the one the Reddit crowd was actually reacting to: the reach.

Why your phone screamed for a Newark case. A Wireless Emergency Alert isn't texted to a list of numbers; it's broadcast to every compatible phone inside a geographic zone, the way a cell tower reaches whatever's near it. The CHP, which runs California's Amber Alert program, can size that zone (external source, opens in a new tab) from a half-mile radius up to statewide depending on where investigators think a suspect is headed. Here, the NCMEC Amber poster (external source, opens in a new tab) and CHP both list the activation area as Alameda and Santa Clara counties. That is not "the whole Bay Area" — but it is roughly 3.7 million people across two of the region's densest counties, which is why it felt like everyone you know got buzzed awake at once.

That breadth is the feature, not the bug. The alert can only work if it lands on the phone of the stranger idling at the light next to a gray Honda Insight. The trade-off is the 7 a.m. jolt, the opt-out debate, and the alert fatigue that sets in when the buzz comes for a case two towns over.

It's a trade-off worth remembering the next time an alert doesn't come. The Dissent reported this week that the disappearance of Chantel Brooks, 36, fell outside California's Ebony Alert age window, and that a stabbing at Oakland's Castlemont High drew complaints from parents that no alert reached them at all. The machinery that woke Alameda and Santa Clara on Saturday is the same machinery that stays silent when a missing person doesn't fit the criteria — and Saturday is a reminder of what it looks like when the system fires fast and a kid comes home.

Newark police say the investigation is ongoing. The father's role is unresolved, the suspect's status unclear, and the case is not closed. But the alert that annoyed a few million people before their alarms went off is, this time, an easy one to forgive.