Yesterday’s post about the mesoscale convective complex (MCC) over Wisconsin needs an update. MCCs can persist for days, sure. But a cold front approaching from the west has changed things. Right now, all the real action has shifted south, to Kansas and Oklahoma, where a low has intensified and threatens to make yet another MCC over Oklahoma. Meanwhile, a cold front about to affect Wisconsin is butting up against a fairly strong high pressure system. That high is giving the whole eastern US great flying weather, but by late tomorrow that cold front should blow through Wisconsin and bring more rain and possible convection over the region. Could another MCC re-form over Wisconsin? Maybe. There’s still a good, 30-40 knot southerly flow over the region at 5,000 feet. If you’re as geeky about weather as I am, you’ll be watching this whole system on the march over the weekend. Meanwhile, here are infrared images of the MCC as it appeared yesterday, along with imagery of this morning’s developing situation over Oklahoma.