Cleveland is bracing for an eclectic mix of weather conditions as high pressure dominates leading into the weekend, followed by a shift that introduces a cold front from northern Ontario Saturday night. According to the National Weather Service Cleveland, the high pressure promises clearer skies and dry conditions through Friday, after a stretch of light lake-enhanced rain showers and drizzle mainly along the lakeshore and west of I-71.
Today's conditions, rather fall-like for August, are dictated by a Canadian high pressure making its way southward, with cooler temperatures sustaining some lake-induced instability across Lake Erie. Despite the cloud cover, the region will remain dry tonight as high temperatures hover in the mid to upper 70s, and mild overnight lows ranging in the low to mid-60s, except for the northeastern parts of Ohio and northwestern Pennsylvania, where it will likely dip into the mid-50s, as detailed by the National Weather Service. Tomorrow, temperatures will see a slight rise, warming into the low 80s for most areas.
The weekend however, marks the arrival of a new weather pattern with the eastward movement of a robust cold front through Saturday night. This transition, hailed by a deepening trough west of the area, will result in a drop to much cooler, below-normal temperatures. Showers and potential thunderstorms are on the docket given the dynamic conditions, with forecasted atmospheric instability that may just be suitable for isolated severe storms, despite the less-than-ideal timing. "PWAT values near 1.5 inches and the robust nature of the environment should support locally heavy rainfall and result in the potential for localized ponding," the National Weather Service predicts.
The process will be unwelcome to those unprepared for the chill as Sunday opens up to cooler air from the northwest. A Canadian air mass will assert itself, bringing a discernible nip to the air, paired with 850mb temperatures plummeting into single digits. "Northerly winds and likely lake effect showers due to the high difference between the 850mb temperatures and the lake water surface temperatures will be the story for early next week," according to the NWS. The cooler air will linger into the long term, with below-average temperatures characteristic more so of the autumn months, a time when nature itself heeds the call to hunker down and prepare for the coming cold.
Aviation and marine activities are also feeling the effects of this weather pattern. The National Weather Service issues cautions for low-end MVFR to IFR ceilings due to the persistent lake effect clouds, and light scattered lake effect showers that could impact visibility in the early morning hours. Winds from the northeast are expected to give way to better conditions by Friday. Still, mariners are facing advisories for rough conditions on Lake Erie, where high waves stemming from the northeasterly flow have warranted a Beach Hazard Statement and Small Craft Advisories, expected to improve as we approach the weekend. The cooler, drier air overall should make for less humid conditions, perhaps a silver lining for those ready to bid adieu to the summer swelters.
