...snip...
it is effing hot this week. +111 degrees all week and the dew point is over 55* which is a indicator of monsoon season. Don't ask me more on dew point, its not humidity, but its somehow relevant.
The SAR unit here is top notch. They have never NOT found their target, even after searching for many weeks.
Dewpoint and Humidity is 100% related - the "dewpoint" is the point where if you lowered the temperature of the air, dew would form - aka 100% humidity
If you know the temperature and the dewpoint, and want to obtain relative humidity, the formulas are as follows:
Convert BOTH temps to degs C - inn your case
111F = 44C (Tc - air temp)
55F = 13C (Tdc - dewpoint temp in C)
The next set of formulas assumes a standard atmospheric pressure. These formulas will calculate saturation vapor pressure(Es) and actual vapor pressure(E) in millibars.
(5) Es=6.11*10.0**(7.5*Tc/(237.7+Tc))
(6) E=6.11*10.0**(7.5*Tdc/(237.7+Tdc))
Once you have the saturation vapor pressure and the actual vapor pressure, relative humidity can be computed by dividing the actual vapor pressure by the saturation vapor pressure and then multiplying by 100 to convert the quantity to a percent.
(7) Relative Humidity(RH) in percent =(E/Es)*100
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