SGP/MET/E9 - RH probe failure

The T/RH probe failed. The resulting problem led to very unreasonable values of RH (~160%) 
which caused the vapor pressure values to also be incorrect.

Use nearby Mesonet stations to get RH and vapor pressure data.

• Vapor pressure mean, calculated(vapor_pressure_mean)
• Relative humidity observed by the Raman lidar(rh_mean)