A warm front lifted through the mid-Atlantic as weak low pressure tracked just west of the region. Overrunning precipitation occurred as the front moved through, but warm air advection on top of an already marginally cold air mass yielded mainly liquid precipitation.
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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 warm front lifted through the mid-Atlantic as weak low pressure tracked just west of the region. Overrunning precipitation occurred as the front moved through, but warm air advection on top of an already marginally cold air mass yielded mainly liquid precipitation. However, some freezing rain did occur initially in higher elevation areas.
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 Feb 12, 3:35 PM EST, 4 hours 25 minutes earlier.
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</html>The national radar mosaic for the moment the first event began.
2 winter weather. Local standard time, as filed.
Radar and temperature data along with observations from surrounding areas suggest areas of light freezing rain likely occurred.
Freezing rain occurred, mainly in higher elevations. The Mount Pocono ASOS (KMPO) measured 0.34 inches of ice accretion.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2020Every state in 2020This day in weather historyWarnings in Pennsylvania, February 2020
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 2026-10-01. Each event’s entry at NCEI: 870704, 870705.