As the city braces for a sweltering week ahead, Pittsburgh's National Weather Service has issued an Extreme Heat Warning for the metro and surrounding counties, alongside a Heat Advisory for broader areas, starting Sunday. The heat index values are expected to swiftly rise above 100°F during the late afternoon of Sunday, as noted in the forecast discussion.
The onset of the heat wave is predicted to begin to seriously affect the region starting Sunday and continue through mid-week, with 12-hour height rises of 2 to 4 dam supporting a strong warming trend, according to the National Weather Service forecast. High temperatures are likely to exceed 90F across much of the area, with Pittsburgh potentially to come dangerously close to record highs from decades past.
VFR conditions are expected to remain through Tuesday under the strong ridge, potentially providing a brief respite for aviation. The forecast discussion emphasizes, however, that restrictions and possibly thunderstorms might make a return from Wednesday as the ridge begins to drift southward.
While the projected swelter is sure to turn heads towards thermometers, it's the days from Monday through Wednesday that carry a very high probability of temperatures hitting 90°F or higher, especially in urban areas where concrete and steel serve to compound the heat. Forecaster models suggest at least a 95% chance for such heat levels in some cities, showing an alarming uptick compared to recent years. The likelihood of highs reaching 95°F or greater is elevated, above 85%, around Pittsburgh, according to the forecast report.
It's not just heat on the docket, either, as late in the week could bring a shift in hazards, with forecast soundings indicating factors supportive of downbursts and localized flooding. With a 30-40% probability increase for severe weather towards the end of the week, attention must now begin to pivot to the potential for hazardous storms.
Expected to break multiple daily records, the heatwave has put historical high temperatures in jeopardy, citing records from cities across Pennsylvania, Ohio, and West Virginia. Pittsburgh alone could see temps push a scorching 98F, a mark set back in 1988. Residents are advised to take extra precautions and remain vigilant during this extreme weather event.
