Extreme Cold 2 : Temperatures that drop well below normal in an area. Whenever temperatures drop well below normal and wind speed increases, heat can leave your body more rapidly (known as the wind-chill effect)
New York City Government, New York City Natural Hazard Mitigation Plan, Appendix B: Glossary, New York, USA 2009. http://www.nyc.gov/html/oem/downloads/pdf/hazard_m itigation/appendix_b_glossary.pdf, (ND/ Gen - Amer) {894}