Nearly a half-million customers awoke to no electric power on Thursday morning from Texas to Tennessee following a high-impact overnight battering of freezing rain, sleet and thunderstorms.
The days-long episode of icing is owed to “overrunning,” or the process by which mild, moisture-rich air slides over a shallow, dense mass of cold air hugging the ground. That allows liquid rain to fall through the warm layer aloft, only freezing into an icy rime once it falls onto the chilly surface.
Leading up to the event, large-scale weather models struggled to pinpoint where the southern lip of cold air mass, nudged south by Arctic high pressure over the central Plains, would park. But about 72 hours before, more sensitive high-resolution models began to come into agreement that places like Austin and San Antonio would be on the fringe.
Larger droplets have a better chance of being heavy and dropping off trees, signposts and other surfaces. Smaller droplets would cling to and freeze on them.
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