A large ridge of high pressure in the upper atmosphere led to relatively calm weather yesterday and today. With the heating of the day, a few pop up thunderstorms developed but no widespread thunderstorms complexes have made an appearance near Columbus. This will change tonight and tomorrow as a cold front slowly pushes east into Ohio.
Several broken lines of storms have formed across eastern Indiana and northwestern Ohio this afternoon. These thunderstorms will slowly make their way towards central Ohio this evening. With the loss of daytime heating, severe weather is not expected. In fact, rain will be scattered to even just isolated through the evening hours. After 10 p.m. the chance for scattered showers and isolated thunderstorms will increase slightly and last through the overnight period.
You will want to take your umbrella out the door with you on Wednesday morning as scattered showers and thunderstorms will be possible even for the morning commute. A lull in activity is expected towards noon and very early afternoon. Depending on how much sun breaks out, severe weather will be possible later in the day.
With the cold front getting closer on Wednesday, wind shear will increase in the atmosphere by late afternoon providing extra fuel for severe thunderstorms to thrive on. If enough instability develops (due to warm air and humidity), damaging winds and hail will be the main threats. Heavy rain will be likely also and an isolated tornado or two cannot be ruled out. Stay alert for possible weather watches and warnings through the second half of the day Wednesday.
The mostly likely time for strong storms will be between 3 p.m. and 9 p.m. on Wednesday. Periods of rain will continue through Wednesday night and the first half of Thursday. Some of that rain could be heavy leading to localized flooding. Cooler air will filter into the region on Thursday with morning temperatures in the 60s falling into the 50s by the evening commute.
Scattered showers will linger on Friday as a deep upper level low rotates south into the Ohio Valley. This big dip in the jet stream will also cause very chilly air to enter Ohio. Highs will barely make it to 60 degrees on both Friday and Saturday.
Temperatures will slowly moderate back into the upper 60s to near 70 by the beginning of next week.