Developed by Dr. Jay Hobgood, The Ohio State University
The temperature will average below normal for the first half of June and it will average above normal during the second half of the month. Precipitation will be above normal for the month.
The weather pattern that brought unseasonably hot temperatures during May will change when June starts. A series of upper level troughs will move over the Great Lakes during the first half of June. Those troughs will produce predominantly northwesterly winds which will bring cooler air from Canada to Ohio.
The Canadian air masses will provide temporary relief from the heat and rain. The upper level pattern will change during the middle of June. An upper level ridge will move closer to the state and it will block cooler air masses from moving southward out of Canada. A surface high pressure system over the Atlantic Ocean will circulate humid air over Ohio.
The humid air will contribute to the development of more widespread showers and thunderstorms during the second half of June.