As Clevelanders soak up the holiday weekend, high pressure along the East Coast is serving up a real scorcher, with temperatures expected to hover in the sweltering upper 80s to low 90s across the region. According to the National Weather Service in Cleveland, most locations will experience mostly sunny skies today, with heat index values in the mid-90s at times in portions of northwest and north-central Ohio. A lake breeze may also stir up a few showers or thunderstorms this afternoon, particularly east of Cleveland.
Tomorrow, the mercury is set to rise even further, pushing heat index values into the mid- to upper 90s, while a weak low-pressure system introduces a slight breeze from the Great Lakes. However, late Sunday forecasts of tentative cloud cover, alongside rising humidity, have prompted discussions about scattered showers and thunderstorms, especially west of I-71.
Transitioning into the workweek, muggy conditions are expected to persist into Sunday night, with an increase in shower and thunderstorm coverage by Monday. The degree of cloud cover may limit instability along the front to some extent on Monday, according to the NWS, which notes that while thunderstorms are expected, they may be less intense due to only modest CAPE values anticipated. Yet, with precipitable water values around 2 inches, localized flooding remains a concern should storms begin to persist over the same areas.
Luckily, Tuesday heralds a break in the pattern. As the cold front treks southward, most areas will be dry, and Cleveland will get a reprieve from the heat. Despite an isolated pop forecast for the southern counties, the NWS forecasts a general decrease in humidity as high pressure builds in from the north, offering a return to more comfortable conditions with high temperatures dipping back into the 80s.
But the relief will be short-lived. The long-term forecast indicates that an unsettled weather pattern will return to the region by Wednesday, as a broad trough over eastern Canada brings chances of afternoon showers and storms, with summer-like heat and humidity remaining in place. Those looking to hit Lake Erie will find conditions relatively calm, with the NWS not anticipating any need for maritime cautions or advisories on the lake for the coming days.
