SGP/MET/E9 - Wind Speed Data Incorrect

Wind speed sensor reference wire became detached.  This caused all wind sensor data to 
report near 0 m/s.

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

SGP/MET/E9 - Time-stamp uncertainty

Between 20100503 and 20100507 the sgp.E9 instruments (EBBR, MET, SIRS, SWATS) time clocks 
were drifting outside the allowable +/-3 seconds.  During the specified period, the 
swings ranged from -326 to +637 seconds.

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

SGP/MET/E9 - RH probe failure

The T/RH probe failed. The resulting problem led to very unreasonable values of RH (~160%) 
which caused the vapor pressure values to also be incorrect.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• Vapor pressure mean, calculated(vapor_pressure_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 vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std
• 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/E9 - Rain gauge clogged

The tipping bucket rain gauge was found to be clogged during bi-weekly maintenance. 
Precipitation data during this time may be suspect.

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

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.

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

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

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.

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

SGP/MET/E9 - 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.

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

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/E9 - Wind sensor malfunction

Loose wire contacts and possible bad bearings caused intermittent wind data dropouts 
during this time.

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

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/E9 - Bad battery

A faulty battery caused periodic missing data.

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

SGP/MET/E9 - Tipping bucket under-reporting precipitation

A power issue caused the tipping bucket to under-report or neglect to report precipitation 
during this time.

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

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.

• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• wdir_vec_std
• 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/EBBR/MET/SWATS/E9 -  Incorrect Timestamp

The data collection computer lost communication with GPS for the affected time period at 
this site. The instrument time is not correct causing the data to be up to 30 minutes 
behind actual time by the end of the affected time period.  The time shift is not linear and 
no known time correction could be applied to the affected data streams.

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

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

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

SGP/MET/E9 - Incorrect Value

MET was dropping out during this period and erroneous values were recorded when it came 
back online.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• vapor_pressure_std
• Wind speed vector mean(wspd_vec_mean)
• Wind direction vector mean(wdir_vec_mean)
• Temperature mean(temp_mean)
• rh_std
• temp_std
• wdir_vec_std
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Wind speed, lower, 1-min avg(wspd_arith_mean)

SGP/MET/E9 - Temperature occasionally failed 6-month field calibration checks

The temperature/humidity sensor was not calibrated annually during this time. The 
temperature reading failed the 6-month field calibration check four times during this period.
Upon removal, the field calibration check reported the temperature sensor may have been 
reading high (< 1 deg C).

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 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/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)