OLI/MET/M1 - Instrument problem

The chilled mirror dew point, vapor pressure, and relative humidity data fall out of 
agreement with co-located sensors during this time. After an instrument self-check, the 
problem was resolved.

• cmh_rh
• cmh_dew_point
• cmh_vapor_pressure

OLI/MET/M1 - Power Outage

No data are available for the selected time range due to a prolonged power outage.

• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• temp_std
• cmh_sat_vapor_pressure
• Wind speed vector mean(wspd_vec_mean)
• pwd_pw_code_1hr
• dew_point_std
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• cmh_temp
• pwd_err_code
• logger_volt
• rh_std
• pwd_cumul_snow
• cmh_dew_point
• Wind direction vector mean(wdir_vec_mean)
• cmh_vapor_pressure
• dew_point_mean
• logger_temp
• Temperature mean(temp_mean)
• pwd_cumul_rain
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• pwd_pw_code_inst
• trh_err_code
• pwd_pw_code_15min
• vapor_pressure_std
• wdir_vec_std
• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• cmh_rh
• Atmospheric pressure(atmos_pressure)
• Vapor pressure mean, calculated(vapor_pressure_mean)

OLI/MET/M1 - Noisy (and missing) CMH data

The chilled mirror hygrometer data became noisy after self-checks during this period. Data 
are missing between 10/16 and 10/21 for service and calibration checks. The instrument 
was returned to service following calibration checks and minor connection repairs.

• cmh_temp
• cmh_rh
• cmh_sat_vapor_pressure
• cmh_dew_point
• cmh_vapor_pressure

OLI/MET/M1 - Chilled mirror hygrometer data spikes due to generator maintenance

During this time, the chilled mirror hygrometer data spiked due to power generator 
maintenance.

• cmh_temp
• cmh_rh
• cmh_sat_vapor_pressure
• cmh_dew_point
• cmh_vapor_pressure

OLI/MET/M1 - Wind data missing following generator maintenance

Following generator maintenance, the wind sensor stopped reporting wind data. 
Communication was reestablished following a configuration check.

• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction vector mean(wdir_vec_mean)

OLI/MET/M1 - Present weather detector backscatter warning

During this time, the present weather detector intermittently indicated a backscatter 
warning. A routine lens cleaning eliminated the backscatter. Data do not appear to be 
affected.

• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• pwd_err_code
• pwd_cumul_snow
• pwd_cumul_rain
• pwd_pw_code_inst
• pwd_pw_code_1hr
• pwd_pw_code_15min

OLI/MET/M1 - Intermittent wind data loss

Occasionally the wind speed data are missing and wind direction data drop to 0 due to an 
ongoing sensor circuitry problem. Only invalid data are missing.

• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction vector mean(wdir_vec_mean)

OLI/MET/M1 - Tower maintenance

Scheduled tower maintenance caused incorrect or missing data during this time. All data 
except for atmospheric pressure and data logger diagnostics should not be used.

• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• cmh_sat_vapor_pressure
• Wind speed vector mean(wspd_vec_mean)
• temp_std
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• pwd_pw_code_1hr
• dew_point_std
• cmh_temp
• pwd_err_code
• rh_std
• pwd_cumul_snow
• Wind direction vector mean(wdir_vec_mean)
• cmh_dew_point
• cmh_vapor_pressure
• dew_point_mean
• Temperature mean(temp_mean)
• pwd_cumul_rain
• pwd_pw_code_inst
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• pwd_pw_code_15min
• vapor_pressure_std
• wdir_vec_std
• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• cmh_rh
• Vapor pressure mean, calculated(vapor_pressure_mean)

OLI/MET/M1 - Wind sensor communication failure

Folllowing a power outage, wind sensor communications failed resulting in missing data.

• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction vector mean(wdir_vec_mean)

OLI/MET/M1 - Missing wind data

Wind sensor lost its communication settings, resulting in missing data during this time.

• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction vector mean(wdir_vec_mean)

OLI/MET/M1 - Missing wind data

A power interruption resulted in missing wind data during this time.

• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Wind direction vector mean(wdir_vec_mean)