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Severe Thunderstorms in Northwest Texas; Critical Fire Weather Concerns in Colorado and Guam

Isolated strong to severe thunderstorms capable of producing large hail and damaging winds will be possible through Tuesday evening across northwest Texas. The combination of dry conditions and gusty winds have led to elevated to critical fire weather concerns across southern Colorado and Guam. Read More >

Vapor Pressure

by Tim Brice and Todd Hall
 
 
Enter a temperature or a dewpoint or both:
Vapor Pressure
If you want the saturated vapor pressure enter the air temperature:  saturated vapor pressure:
  Fahrenheit Celsius Kelvin mb in of HG mm HG 
hPA kPA lbs per square in
If you want the actual vapor pressure enter the dewpoint:  actual vapor pressure:
  Fahrenheit Celsius Kelvin mb in of HG mm HG 
hPA kPA lbs per square in
If you enter both the air temperature and the dewpoint you'll get a bonus answer.  relative humidity - requires both temp and dewpoint
  %

 

What is the formula for the vapor pressure script?