AWR/LDIS/MET/S1 - Precipitation Measurements Suspect

Analysis of the PARS2 and the PWD precipitation data indicate that the results are 
suspect, possibly due to frost/blowing snow.  Both instruments reported precipitation for a 
majority of the days.

The TSI movies were reviewed and the days of noticeable precipitation are:

12/26/15
12/31/15 - Potentially just frost buildup
1/6/16
1/11/16
1/12/16
1/13/16

Review the TSI data for timing of precipitation

• Diameter of smallest drop observed(diameter_min)
• Intercept parameter, assuming an ideal Marshall-Palmer type distribution(intercept_parameter)
• Fall velocity calculated after Lhermite(fall_velocity_calculated)
• Particle size average(particle_size)
• Radar reflectivity calculated by the ingest(equivalent_radar_reflectivity)
• Liquid water distribution mean, assuming an ideal Marshall-Palmer type
  distribution(liquid_water_distribution_mean)
• Retrieved Liquid Water Content(liquid_water_content)
• Slope parameter, assuming an ideal Marshall-Palmer type distribution(slope_parameter)
• Diameter of largest drop observed(diameter_max)
• Number density of drops of the diameter corresponding to a particular drop size
  class per unit volume(number_density_drops)
• Median volume diameter, assuming an ideal Marshall-Palmer type distribution(median_volume_diameter)
• Moment 4 from the observed distribution(moment4)
• Moment 3 from the observed distribution(moment3)
• Meteorological optical range visibility(mor_visibility)
• Moment 2 from the observed distribution(moment2)
• Moment 1 from the observed distribution(moment1)
• Precipitation intensity(precip_rate)
• Moment 6 from the observed distribution(moment6)
• Moment 5 from the observed distribution(moment5)
• Fall velocity classes observed by Parsivel2(raw_fall_velocity)
• Number of particles detected(number_detected_particles)
• Radar reflectivity from the manufacturer's software(equivalent_radar_reflectivity_ott)
• SYNOP WaWa Table 4680(weather_code)
• Raw drop size distribution(raw_spectrum)

• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• PWD instantaneous present weather code(pwd_pw_code_inst)
• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• PWD cumulative liquid precipitation(pwd_cumul_rain)
• PWD 15 minute present weather code(pwd_pw_code_15min)
• PWD 1 hour present weather code(pwd_pw_code_1hr)
• Cumulative snow(pwd_cumul_snow)
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• PWD alarm(pwd_err_code)