Siple

“It has been an intense week,” Mr. Siple said.

Sam Siple, an official with Nashville Rescue Mission, a nonprofit shelter, said demand for services has been especially high.

The term “wind chill” was first coined in 1939 by geographer and Antarctic explorer Paul Siple.

In a doctoral dissertation that year, Paul Siple, an Antarctic explorer and geographer, observed that “it is not always the windiest days or the coldest ones that affect man’s sensation of chill most.”

To put this into numbers, Dr. Siple created a formula that multiplied the temperature below freezing in degrees Celsius by the wind speed in meters per second.