A stagnant, moist air mass just north of a stationary front allowed areas of dense fog to develop early on May 26th. The fog dissipated shortly after dawn.
Every event with a place to put it; 3 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PHI wrote it up.
A stagnant, moist air mass just north of a stationary front allowed areas of dense fog to develop early on May 26th. The fog dissipated shortly after dawn.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Philadelphia/Mount Holly wrote its last area forecast discussion before the first event at May 25, 7:39 PM EST, 3 hours 21 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
3 dense fog. Local standard time, as filed.
Several hours of dense fog was observed at Reading Regional Airport.
Several hours of dense fog was observed at Jake Arner Airport.
Several hours of dense fog was observed at Queen City Airport.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2026Every state in 2026This day in weather historyWarnings in Pennsylvania, May 2026
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1332961, 1332962, 1332963.