National Weather Service United States Department of Commerce

Significant Severe Weather Outbreak Likely Today

A significant severe thunderstorm outbreak is likely for portions of the Midwest this afternoon and evening, especially from eastern Iowa into northern and central Illinois. The threats include tornadoes, a few which may be significant, large to very large hail, and damaging winds. A powerful system near the Central Plains will lift north and clash with a warm and humid air mass over the region. 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?