SGP/MET/E13 - PWD data incorrect/missing

Data collection problems during the time period specified resulted in incorrect or missing 
PWD data.

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

SGP/MET/E13 - Missing PWD data

PWD data were missing due to an accidental reset on the instrument.

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

SGP/MET/E13 - Low logger voltage

Low logger voltage was reported. Low voltage may result in data spikes or dropouts.

• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• pwd_cumul_rain
• Vapor pressure mean, calculated(vapor_pressure_mean)
• logger_temp
• temp_std
• vapor_pressure_std
• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• pwd_pw_code_15min
• tbrg_precip_total
• pwd_pw_code_1hr
• pwd_pw_code_inst
• Atmospheric pressure(atmos_pressure)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• Temperature mean(temp_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)
• pwd_cumul_snow
• Wind direction vector mean(wdir_vec_mean)
• rh_std
• logger_volt
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)
• pwd_err_code

SGP/MET/E13 - Ice on wind sensor

Wind speed and direction are flat-lined due to ice accumulation on the sensor.

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

SGP/MET/E11/E15/E21/E31/E33/E34/E35/E36/E37/E38/E9 - Ice on wind sensors

Wind data was affected by ice buildup on the sensors. Data during this period should be 
used with caution. Exact times of sensor thaw are unknown.

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

SGP ALL INSTRUMENTS - Icing Event

An icing event (winter storm Cara) passed slowly through the area during this time frame.  
Instruments at the SGP may have been affected by ice accumulation.

• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• pwd_cumul_rain
• logger_temp
• Vapor pressure mean, calculated(vapor_pressure_mean)
• vapor_pressure_std
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• pwd_pw_code_1hr
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• Temperature mean(temp_mean)
• pwd_cumul_snow
• pwd_err_code
• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• temp_std
• pwd_pw_code_15min
• tbrg_precip_total
• pwd_pw_code_inst
• Atmospheric pressure(atmos_pressure)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• rh_std
• logger_volt
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)

• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)
• Atmospheric pressure(atmos_pressure)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• wdir_vec_std
• tbrg_precip_total
• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• Temperature mean(temp_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)

SGP/MET/E13 - Data suspect due to system power issues

Issues with power supply to the system caused outages and suspect data during this time.

• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• pwd_cumul_rain
• Vapor pressure mean, calculated(vapor_pressure_mean)
• logger_temp
• temp_std
• vapor_pressure_std
• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• pwd_pw_code_15min
• tbrg_precip_total
• pwd_pw_code_1hr
• pwd_pw_code_inst
• Atmospheric pressure(atmos_pressure)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• Temperature mean(temp_mean)
• wdir_vec_std
• Wind speed vector mean(wspd_vec_mean)
• pwd_cumul_snow
• Wind direction vector mean(wdir_vec_mean)
• rh_std
• logger_volt
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)
• pwd_err_code

SGP Site Power Outage Due to Winter Storm

On Saturday and Sunday, December 26 and 27th a powerful winter storm (Goliath) brought 
sleet and freezing rain to much of Oklahoma with wind gusts of 45 MPH at times. The result 
was very very slick roads and mass power outages.
 
The SGP central facility lost power at 8:55 PM CDT on Sunday, December 27th.  
The power was restored on 7:56 PM CDT on Wednesday, December 30th
 
Site Emergency procedures were activated and Technicians drained water out of instrument 
reservoirs and other measures as needed, early Monday morning.
 
On Wednesdays as roads and power started was restored to much of the areas east of I-35 , 
Site Technicians performed maintenance on several Extended Facilities.

During this period, data are potentially missing, incorrect, or suspect.  Carefully 
inspect the data before use.

• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• pwd_cumul_rain
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• qc_logger_volt
• Temperature mean(temp_mean)
• qc_temp_mean
• qc_pwd_mean_vis_10min
• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• temp_std
• qc_rh_mean
• pwd_pw_code_15min
• qc_tbrg_precip_total_corr
• qc_logger_temp
• qc_pwd_mean_vis_1min
• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• qc_pwd_cumul_rain
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)
• logger_temp
• qc_pwd_pw_code_15min
• Vapor pressure mean, calculated(vapor_pressure_mean)
• vapor_pressure_std
• qc_wdir_vec_mean
• qc_pwd_pw_code_1hr
• pwd_pw_code_1hr
• qc_pwd_precip_rate_mean_1min
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• qc_atmos_pressure
• Altitude above mean sea level(alt)
• pwd_cumul_snow
• North latitude(lat)
• qc_wspd_vec_mean
• time_offset
• qc_pwd_cumul_snow
• pwd_err_code
• East longitude(lon)
• qc_tbrg_precip_total
• qc_pwd_pw_code_inst
• qc_vapor_pressure_mean
• qc_time
• tbrg_precip_total
• pwd_pw_code_inst
• Atmospheric pressure(atmos_pressure)
• wdir_vec_std
• time
• qc_wspd_arith_mean
• base_time
• qc_wdir_vec_std
• rh_std
• logger_volt

• qc_tbrg_precip_total
• East longitude(lon)
• qc_wdir_vec_std
• qc_vapor_pressure_mean
• Altitude above mean sea level(alt)
• qc_wspd_arith_mean
• base_time
• wdir_vec_std
• qc_wdir_vec_mean
• time_offset
• Temperature mean(temp_mean)
• qc_rh_mean
• Vapor pressure mean, calculated(vapor_pressure_mean)
• qc_wspd_vec_mean
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)
• qc_time
• Atmospheric pressure(atmos_pressure)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• time
• tbrg_precip_total
• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• qc_atmos_pressure
• North latitude(lat)
• qc_temp_mean
• qc_tbrg_precip_total_corr

SGP/MET/E13 - False tips in high winds

The TBRG's were mounted at a height that made them prone to vibrations caused by high 
winds which may have caused false tips.  The end date of this DQR indicates when the rain 
gauge was lowered to mitigate these effects.  

Effects on the total precipitation amounts are assumed to be negligible.

• tbrg_precip_total
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)

SGP/MET/E15 - False tips in high winds

The TBRG's were mounted at a height that made them prone to vibrations caused by high 
winds which may have caused false tips.  The end date of this DQR indicates when the rain 
gauge was lowered to mitigate these effects.  

Effects on the total precipitation amounts are assumed to be negligible.

• tbrg_precip_total
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)

SGP/MET/E15 - Tipping bucket rain gauge clogged

During maintenance rounds, debris was found clogging the rain gauge funnel.

• tbrg_precip_total
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)

SGP/MET/E15 - No precipitation recorded

For an unknown reason, the tipping bucket rain gauge did not record precipitation events.

• tbrg_precip_total
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)

SGP/MET/E13 - Data Spikes

MET went down during some storms and produced some erroneous errors when brought back 
online.

• Temperature mean(temp_mean)
• temp_std

SGP/MET/E13 - Wind Values Incorrect

Wind speed is incorrect after coming back online

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

SGP/MET/E13 - False corrected precipitation values

A program bug allowed for maintenance tips to be recorded as precipitation in the 
tbrg_precip_total_corr variable.

• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)

SGP/MET/E11/E13/E15/E21/E31/E32/E33/E34/E35/E36/E37/E38/E39/E40/E41/E9 - Ice storm 
affected winds

An ice storm impaired the wind sensor mechanics during this time. At most sites, winds 
flatlined for a large part of 1/15. Data from 1/14 - 1/16 may not be accurate.

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

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

SGP/MET/E13 - Optical rain gauge data missing

No optical rain gauge data are available during this time.

• ORG precipitation rate mean(org_precip_rate_mean)

SGP/MET/STAMP/All - Freezing Rain Event

A freezing rain event potentially affected some of the STAMP and MET tipping bucket rain 
gauges.  The rain accumulation amounts generally agree (2 exceptions noted below) but the 
timing and rate of precipitation may disagree at times between the STAMP and MET.

Instruments at E33 and E39 were found to differ more than the expected uncertainty and 
will be covered in additional DQRs if a problem is found.

• tbrg_precip_total
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)

• tbrg_precip_total
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)

SGP/MET/E13 - Optical rain gauge data parsing error

A data acquisition problem caused incorrect optical rain gauge data to be reported.

• ORG precipitation rate mean(org_precip_rate_mean)

SGP/Central Facility - Power Outage

Automated scripts show that these instruments were affected by a power outage at the 
central facility resulting in missing data.  Most of the instruments came back online on March 
6th but some took longer.

• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• pwd_cumul_rain
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• ORG precipitation rate mean(org_precip_rate_mean)
• qc_logger_volt
• Temperature mean(temp_mean)
• qc_temp_mean
• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• qc_pwd_mean_vis_10min
• qc_org_precip_rate_mean
• temp_std
• qc_rh_mean
• pwd_pw_code_15min
• qc_tbrg_precip_total_corr
• qc_logger_temp
• qc_pwd_mean_vis_1min
• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• qc_pwd_cumul_rain
• Corrected total precipitation measured by TBRG(tbrg_precip_total_corr)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• qc_pwd_pw_code_15min
• logger_temp
• qc_wdir_vec_mean
• vapor_pressure_std
• qc_pwd_pw_code_1hr
• pwd_pw_code_1hr
• qc_pwd_precip_rate_mean_1min
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• qc_atmos_pressure
• Altitude above mean sea level(alt)
• pwd_cumul_snow
• North latitude(lat)
• qc_wspd_vec_mean
• time_offset
• qc_pwd_cumul_snow
• pwd_err_code
• East longitude(lon)
• qc_tbrg_precip_total
• qc_pwd_pw_code_inst
• qc_vapor_pressure_mean
• qc_time
• tbrg_precip_total
• pwd_pw_code_inst
• Atmospheric pressure(atmos_pressure)
• wdir_vec_std
• time
• qc_wspd_arith_mean
• base_time
• rh_std
• logger_volt

SGP/MET/E15 - Temperature/humidity sensor occasionally failed 6-month field calibration 
checks

The temperature/humidity sensor was not calibrated annually during this time. The 
temperature/humidity readings failed the 6-month field calibration check two times during this 
period (temperature read low, humidity read high).

In general, the relative humidity may have been subject to drift during this time. The 
manufacturer characterizes sensor drift at <1% / year.

• Temperature mean(temp_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)

SGP/MET/E15 - Temperature/humidity sensor failed a field calibration check

The temperature sensor failed a 6-month field calibration check during this period 
(temperature read high). Upon removal, the field calibration check reported the temperature 
reading was high, and the humidity reading was low.

• Temperature mean(temp_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)

SGP/MET/E13 - Temperature/humidity sensor occasionally failed 6-month field calibration 
checks

The temperature/humidity sensor was not calibrated annually during this time. The 
temperature/humidity readings failed the 6-month field calibration check on four occasions during 
this period (temperature reading low, humidity reading high). Upon removal, the field 
calibration check reported the humidity reading was high (+4%).

In general, the relative humidity may have been subject to drift during this time. The 
manufacturer characterizes sensor drift at <1% / year.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• Temperature mean(temp_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)

SGP/MET/E15 - Temperature/humidity sensor failed a field calibration check

The temperature/humidity sensor failed a 6-month field calibration check during this time 
(temperature reading low). The relative humidity was noted reading high in 
near-saturation conditions.

• Temperature mean(temp_mean)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)

SGP/MET/E13 - Present weather detector data incorrect after power outage

A power interruption caused the data logger to read incorrect data from the present 
weather detector.

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

SGP/MET/E13 - Optical rain gauge data incorrect after power outage

A power interruption caused the data logger to read incorrect data from the optical rain 
gauge.

• ORG precipitation rate mean(org_precip_rate_mean)

SGP/MET/E13 - Wind speed incorrect

A broken wind speed signal wire caused incorrect data during this time.

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