A lingering weather phenomenon could bring severe conditions for days.
Damaging wind gusts and an isolated tornado are also possible, forecasters said.
All of southeastern Pennsylvania is in the level 2 "slight risk" category, forecaster said.
The latest forecast for the Philadelphia area calls for damaging winds, quarter inch hail, and downpours.
El Niño could have a significant impact on what kind of weather hits the region this year.
Dangerous heat and humidity could give way to severe weather this afternoon and evening, forecasters said.
Crushing humidity and multiple chances for thunderstorms are expected later this week in the Philadelphia region.
The storms could break a several day heat wave of temperatures soaring into the 90s.
A developing geomagnetic storm could bring sightings of the northern lights to eastern Pennsylvania.
The weekend weather forecast looks ideal for outdoor skywatching activities.
The storms will mark a changing weather pattern in the Philadelphia area over the coming week.
Wednesday's storms brought in an "unsettled" weather pattern that will mark a 40 degree temperature drop from Wednesday.
Another day of mid-90s heat could finally break when a severe storm front arrives Wednesday, forecasters said.
El Niño and its impacts on Pennsylvania are on an accelerated timeline, forecasters say.
The El Nino weather pattern could have significant effects on the coming summer in Pennsylvania.
Stormy weather will be interspersed with sparkling sunshine and balmy temperatures over the coming days, forecasters said.
El Niño is likely to wield some notable influence over weather patterns around Pennsylvania in the coming months.
Up to an inch of rain could fall in the Philly region, as thunderstorms threaten. Details:
The coming days of rain and cooler air could signal the beginning of a colder than usual May, forecasters said.
Desultory conditions may be on tap for the weekend. The latest from forecasters:
A geomagnetic storm could push the aurora south over the Northeast, according to NOAA.
Days after record breaking heat in eastern Pennsylvania, a blast of winter weather is on the way.
Record heat could be replaced by record cold in the coming days.
Winds up to 60 miles per hour could cause significant damage, as forecasters urge residents to monitor for warnings.
Forecasters touted "high confidence" in records being set in the coming days.
Temperatures could threaten a record from 1941.
Multiple people in the Philadelphia region reported seeing a fireball in the sky Tuesday.
Drastic temperature variations and the general "unsettled" pattern will continue, forecasters said.
Highs in the mid-80s, rain, thunderstorms, and more with a chaotic week on tap. Details:
A new long-range spring and summer forecast has been released for Pennsylvania. Here's what you need to know:
Snow, rain, ice, tornadoes, heat, cold: it's all hit the Philly region in the past few weeks, and stability is not on the immediate radar.
Downed trees and wires, road closures, power outages, and other damages were assessed after Monday's destructive winds.
An "especially intense tornado" is possibile, forecasters said, with potential 80 mph wind gusts that could close roads and cancel flights.
Near-record heat this week may have had you thinking otherwise, but winter isn't over yet.
The most severe impacts are expected between 3 p.m. and 10 p.m. for the Philadelphia region, forecasters said.
Near record heat will give way to a cold front that could plummet temperatures by 40 degrees.
The snowiest winter in years is not over yet, but forecasters are pointing to 60 and 70 degree days on the near horizon. Details:
On the East Coast, deep-red totality occurs around 6:25 to 6:33 a.m., almost exactly at sunrise.
Winter will continue Tuesday night in the Philadelphia region, forecasters said.
Here's how much snow has fallen so far in Eastern Pennsylvania.