National Weather Service United States Department of Commerce

Widespread Excessive Heat and Humidity in Midwest to Spread to East Coast

High pressure building across the Central and Eastern U.S. will produce a dangerous combination of heat and humidity. Heat indices from unusually high dewpoints and well above normal temperatures may reach 110 to 115 degrees. In addition, near record warm low temperatures will limit recovery from hot daytime temperatures. Read More >

Wind Speed Conversion

by Tim Brice and Todd Hall
Enter a wind speed that you would like:
mph (miles per hour) mph
knots knots
m/s (meters per second) m/s
ft/s (feet per second) ft/s
km/h (kilometers per hour) km/h
What are the formula for the wind speed conversion script?