SGP/MET/E21 - Wind Sensor Inoperative Due to Ice

Due to an ice storm the wind sensor was inoperative.

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

SGP/MET/E21 - TimeCheck Error

Starting on 2010-06-07 the E21 system clock started drifting until the problem was 
corrected on 2010-06-29.  The maximum daily offset reported in the collection logs were:

Jun 7 offset:	  -5.04
Jun 8  Offset:	  -267.449039
Jun 9  Offset:	  -541.038624
Jun 10 Offset:	  -814.469141
Jun 11 Offset:	  -1076.862114
Jun 12 Offset:	  -1350.330223
Jun 13 Offset:	  -1623.639335
Jun 14 Offset:	  -1897.047754
Jun 15 Offset:	  -2170.552312
Jun 16 Offset:	  -2422.130746
Jun 17 Offset:	  -2684.607495
Jun 18 - Jun 22 (unknown)
Jun 23 Offset:	  -4204.730579

If the E21 system clock drifts the E21 Datalogger clocks will be set to the same incorrect 
time. The met data will be correct but the corresponding time stamp cannot be accurately 
known or simply corrected.

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

• 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)

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.

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

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