After pushing 90 degrees Wednesday, likely the hottest day of the week for Philadelphia, the roller-coaster weather is on track to continue.
The area was under an air quality alert midweek for those with sensitivities such as asthma, as a hot, stagnant air mass hovered above the city.
Showers will eradicate this on Thursday as a weak disturbance moves in from the Ohio Valley. Storms could bring locally heavy rain, adding to what has already been the wettest summer ever recorded in Philadelphia.
From June 1 through Aug. 21, the city has received 270 percent of normal rainfall for the meteorological summer. The new record of 27.58 inches smashed the old record of 24.58 inches set in 2011.
Showers and a thunderstorm will usher in a cool front, dropping temperatures Thursday night. Lows in the 70s will bear a stark contrast to the 90-degree highs felt only 24 hours prior.
Humidity will remain low through the weekend with highs in the low 80s and plenty of sunshine.
The summer has been up and down for Philadelphia. The middle of July marked an intense heat wave, with temperatures pushing the mercury as high as 100 F at times. A cool period followed, bringing temperatures that, at times, more closely resembled fall than early August.
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Hurricane Maria will likely come close enough to North Carolina to trigger gusty winds and rain, while unleashing dangerous seas elsewhere along the East Coast this week.
A cold front will spread needed rainfall across drought-stricken parts of eastern Australia during the middle of the week.
The cold front that is expected to whisk Hurricane Maria back out to sea after it nears North Carolina will trim the summerlike warmth out of the midwestern and northeastern United States this week.
Emergency officials in Puerto Rico evacuated tens of thousands of people on Friday afternoon due to an imminent dam failure in the nearby areas of Isabela and Quebradillas, following Hurricane Maria's devastating blow.
Tropical Storm Pilar is expected to churn up rough seas and raise the risk for flooding downpours across southwestern Mexico this week.
Thousands of people have been evacuated from their homes on the Indonesian island of Bali due to fears of Mount Agung potentially erupting.
Recent earthquakes near North Korea’s nuclear test site have raised questions as to how far radioactive material would travel if an underground atomic explosion triggers a leak.
While no new threats are lurking behind Maria and Lee this week, residents of the Caribbean and United States should not let their guard down as tropical season is far from over.