From The Sun's print editions:
Baltimore Sun reporter Candus Thomson offers this guest post:
Indian Summer, by the strictest of definitions, doesn’t appear to be on Baltimore’s horizon or even beyond, according to the Accuweather charts.
No one knows what Native Americans called the almost sultry conditions in late fall that followed the first killing frost, but our use of the term dates back to the 1700s, says National Weather Service historian William Deedler. The mild spell usually ends when low pressure moves in and the jet stream shifts from the south or southwest to north or northwest.