Today (Sunday) will feature the last quiet and comfortable weather day in the Valley. High pressure is sliding southeast of the region will establish a southwest flow that will funnel in heat and moisture that will push temperatures this afternoon a bit higher than yesterday. While dew points will remain in the comfortable zone yet today, they will begin to creep up tonight.
Temperatures locally will warm to the upper-80s, generally speaking. Some spots will probably touch 90° for the first time since July 27th – the last day we officially reached 90° at New Philadelphia. Otherwise, I don’t see much hope for any precipitation or really much in the way of cloud formation with a decent cap in place.
The high will shift further east tonight setting up a more southerly flow. Conditions tonight will remain mostly clear but temperatures will be a handful of degrees warmer overnight. Lows will likely bottom out in the mid-60s prior to sunrise.
With south winds firmly established on Monday, a warm front will lift through east-central Ohio. Warm air will push temperatures to the low-90s in the Valley. Moisture will increase raising dew points locally to the mid/upper-60s. This combination of heat and humidity will push heat index values to the mid/upper-90s. Clouds will also be limited by a lack of upper-level moisture, so expect strong sunshine to boot.
A weak cold front will approach from the west Monday night and cross the region on Tuesday. Dew points will spike Tuesday ahead of the front reaching the uncomfortable 70s. Scattered showers and storms will likely fire up as the front approaches Monday night and moves through the area on Tuesday. Depending on the amount of instability present, some storms could be strong. With the amount of humid air, pockets of brief heavy rain are also something we’re watching.
WEDNESDAY THROUGH FRIDAY
High pressure will return behind Tuesday’s weak front. This should provide another period of mainly dry weather for the Valley. However, we will need to keep chances for isolated/scattered showers and storms in the forecast due to lingering moisture and afternoon instability.
There is only a slight change in air mass behind that weak front. Temperatures will remain quite warm and dew points will remain elevated. Expect mainly upper-80s through the latter part of the week and it will stay uncomfortably humid. With that weak frontal boundary stalled out south of the area, popup showers and storms will be possible during peak afternoon heating and instability. Localized heavy rainfall will remain a concern with any precipitation events.