Cold air damming is something that happens when warm air tries to build from the southwest, but it doesn’t spill east over the Appalachians (usually). This is why you are seeing temperatures in the mid to upper 50s through Kentucky, and it is only in the mid 40s in Charlotte and Greenville.

There is an area of low pressure hanging out in the Gulf of Alaska that is sending successive rounds of moisture into the Pacific Northwest. It isn’t a strong system and is really only notable because of the time of year it is arriving. It is the first real snow storm for the northern Rockies and Cascades, and will be persistent and cold enough to bring lasting snow.

We all know about the urban heat island. Typically, city center or airport observation points are the warmest local point in an area. Not Cincinnati! The airport in Covington (KCVG) is the low point around southeast Ohio.