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 1 minute mean visibility(pwd_mean_vis_1min)
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• pwd_cumul_rain
• logger_temp
• Vapor pressure mean, calculated(vapor_pressure_mean)
• 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
• pwd_pw_code_1hr
• tbrg_precip_total
• 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
• pwd_err_code
• TBRG precipitation total, corrected(tbrg_precip_total_corr)

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
• TBRG precipitation total, corrected(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_cumul_rain
• PWD 10 minute mean visibility(pwd_mean_vis_10min)
• PWD 1 minute mean precipitation rate(pwd_precip_rate_mean_1min)
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• Temperature mean(temp_mean)
• qc_logger_volt
• qc_temp_mean
• PWD 1 minute mean visibility(pwd_mean_vis_1min)
• qc_pwd_mean_vis_10min
• 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
• TBRG precipitation total, corrected(tbrg_precip_total_corr)
• Vapor pressure mean, calculated(vapor_pressure_mean)
• qc_pwd_pw_code_15min
• logger_temp
• vapor_pressure_std
• qc_wdir_vec_mean
• qc_pwd_pw_code_1hr
• qc_pwd_precip_rate_mean_1min
• pwd_pw_code_1hr
• 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
• tbrg_precip_total
• qc_time
• pwd_pw_code_inst
• Atmospheric pressure(atmos_pressure)
• wdir_vec_std
• time
• base_time
• qc_wspd_arith_mean
• qc_wdir_vec_std
• rh_std
• logger_volt

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
• TBRG precipitation total, corrected(tbrg_precip_total_corr)

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.

• TBRG precipitation total, corrected(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)

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
• TBRG precipitation total, corrected(tbrg_precip_total_corr)