Thanks Sparkie, that actually helped quite a bit!
Seems like there will probably be continuous windstorms along the boundary of the warm area, with cold air off the steppes pouring in as the hotter air mass rises.
On my world there is a magically created desert about 450 miles across where the average daytime temperature is about 20 degrees (F) higher than the surrounding steppes and mountains. It is in the middle of a region roughly analogous to Mongolia in latitude and climate (it is in the middle of a...