The last couple of nights, parts of our WREX viewing area have been placed under freeze warnings. However, none of us are under one tonight, despite the fact that our temperatures will be comparable to what they were this morning. So, what gives?
Freeze warnings (and frost advisories, for that matter) are only issued when a freeze (or frost) is forecast to occur outside of its climatologically "normal" time. They are also issued for the first freeze (or frost) because, after that event has happened, any additional ones don't matter. Any hard freeze after the first hard freeze won't have a significant impact, because any vegetation that would normally die already has by that point.
So, since we had a killing freeze this morning, no more freeze warnings will be issued until next spring at the earliest. This cold airmass hasn't stopped in the Stateline, though - a freeze warning is out for areas as far south as northern Florida!
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