Pittsburgh, Pennsylvania – A tornado warning Wednesday near downtown Pittsburgh prompted questions about why some residents received emergency phone alerts while others did not.
According to the National Weather Service Pittsburgh office, Wireless Emergency Alerts (WEA) are only sent to phones located inside the specific warning polygon, not the entire county where a warning may be issued.
The clarification followed Wednesday afternoon’s tornado warning, which briefly included parts of the Pittsburgh area before being allowed to expire as the storm weakened. The agency said warnings are drawn using polygon-based areas that represent locations under the most immediate threat, rather than covering entire counties.
Because of that system, people just outside the polygon may not receive an alert, even if they live nearby. At the same time, someone inside the polygon — even a short distance away — will typically receive the notification.
NWS Pittsburgh explained that meteorologists carefully adjust warning polygons as storms evolve. The goal is to keep alerts focused on locations facing the highest risk while avoiding unnecessary alerts for surrounding communities.
In Wednesday’s case, meteorologists said the tornado warning was issued after radar detected a rotation signature approaching the Pittsburgh area. The city ultimately sat within the downstream track of the storm, placing it inside the warning polygon.
However, forecasters said the rotation weakened before reaching downtown Pittsburgh, allowing the warning to expire early. As of the agency’s update, no damage reports had been received that would require a storm survey.
Wireless Emergency Alerts are typically triggered only for the most serious threats, including tornado warnings, flash flood emergencies, destructive winds above 80 mph, baseball-size hail, considerable flash flooding, and snow squalls.
For commuters, students, and workers moving across county lines, officials note that phone alerts can change quickly depending on location relative to the warning area.
Residents who experienced storm damage are encouraged to report it to the National Weather Service.
This article was produced by a journalist and may include AI-assisted input.
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