NSA/SKYRAD/C1 - IRT measurements during precipitation events

The IRT measurement of sky/cloud temperature was in question during precipitation events 
because rain or snow could accumulate in the upward-pointed lens barrel. This was 
corrected by reorienting the IRT to measure the sky temperature as reflected by a gold mirror.

Use present weather sensor (nsapwsC1.b1) data to
determine timing of precip events.

• Sky Infra-Red Temperature(sky_ir_temp)
• Sky Infra Red Temperature Maxima(sky_ir_temp_max)
• Sky infrared temperature, standard deviation(sky_ir_temp_std)
• Sky Infra-Red Temperature Minima(sky_ir_temp_min)