NSA/MET/C1 - Temp/RH/wind data questionable

New wind sensors and new T/RH probes were being installed during this time period.  The 
tower booms were lowered and much of the data collected were not at listed heights nor were 
the data accurate due to configurations during install.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_mean
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• qc_wspd_arith_mean
• qc_rh_mean
• qc_wspd_vec_mean
• Wind direction vector mean(wdir_vec_mean)
• vapor_pressure_std
• qc_wdir_vec_mean
• Temperature mean(temp_mean)
• Wind speed vector mean(wspd_vec_mean)
• vapor_pressure_mean
• wdir_vec_std
• temp_std
• qc_temp_mean
• qc_vapor_pressure_mean
• qc_dew_point_mean
• trh_err_code
• dew_point_std
• rh_std

NSA/MET/C1 - PWS data missing due to snow impaction

Blizzard conditions caused the optics to become impacted with snow and ice rendering the 
Present Weather Detector inoperative.

• qc_pws_cumul_snow
• qc_pws_pw_code_15min
• qc_pws_precip_rate_mean_1min
• qc_pws_cumul_rain
• PWS 10 minute mean visibility(pws_vis_mean_10min)
• pws_err_code
• pws_cumul_rain
• qc_pws_vis_mean_1min
• pws_pw_code_1hr
• pws_cumul_snow
• pws_precip_rate_mean_1min
• pws_pw_code_15min
• qc_pws_pw_code_inst
• pws_pw_code_inst
• qc_pws_pw_code_1hr
• qc_pws_err_code
• qc_pws_vis_mean_10min
• PWS 1 minute mean visibility(pws_vis_mean_1min)

NSA/MET/C1 - Wind data intermittent

There was a loose wire on the serial data multiplexer causing the wind data to become 
missing during high wind situations.  The high winds caused the enclosure to vibrate making 
the connection intermittent.

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

NSA/MET/C1 - CMH data missing or suspect

The data from the CMH was missing during these times due to a failing logic board.  The 
board was replaced.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - Met data incorrect during calibration

All met data from the tower booms (temp, RH, winds and derived variables) were incorrect 
due to the booms being lowered from their measurement heights.  Additionally, the 
scaffolding was located directly adjacent to the booms affecting the wind field and the Temp/RH 
data.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_mean
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• qc_wspd_arith_mean
• qc_rh_mean
• qc_wspd_vec_mean
• Wind direction vector mean(wdir_vec_mean)
• vapor_pressure_std
• Temperature mean(temp_mean)
• qc_wdir_vec_mean
• Wind speed vector mean(wspd_vec_mean)
• vapor_pressure_mean
• wdir_vec_std
• temp_std
• qc_temp_mean
• qc_time
• qc_vapor_pressure_mean
• qc_dew_point_mean
• trh_err_code
• dew_point_std
• rh_std

NSA/MET/C1 - PWS calibration

The PWS was undergoing calibration. Any data collected during this time is not 
representative of the atmospheric state.

• qc_pws_cumul_snow
• qc_pws_pw_code_15min
• qc_pws_precip_rate_mean_1min
• qc_pws_cumul_rain
• PWS 10 minute mean visibility(pws_vis_mean_10min)
• pws_err_code
• pws_cumul_rain
• qc_pws_vis_mean_1min
• pws_pw_code_1hr
• pws_cumul_snow
• pws_precip_rate_mean_1min
• pws_pw_code_15min
• qc_pws_pw_code_inst
• pws_pw_code_inst
• qc_pws_pw_code_1hr
• qc_pws_err_code
• qc_pws_vis_mean_10min
• PWS 1 minute mean visibility(pws_vis_mean_1min)

NSA/MET/C1 - CMH calibration

CMH data missing due to removal of the sensor for annual calibration.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - 2m RH values incorrect

The new t/rh probe installed during annual calibrations and checks began to exhibit 
readings that were biased high compared to the Chilled Mirror Hygrometer.  In high RH 
conditions the sensor would consistently report RH values in excess of 105%.  Comparisons to the 
other tower levels also suggested that the 2m level RH data is suspect.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_mean
• vapor_pressure_mean
• qc_rh_mean
• qc_dew_point_mean
• vapor_pressure_std
• dew_point_std
• rh_std

NSA/MET/C1 - CMH and 10m winds failure

At 0513GMT on 1/23 the atmos_pressure and CMH - temp, RH, DP & Sat. VP changed abruptly to 
unlikely values. The 10m winds failed at 1420GMT.

The CMH was repaired on 02/04/2010 at 2254GMT and the 10m winds sensor was replaced on 
02/05/2010 at 2100GMT.

• cmh_dew_point
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• qc_wspd_arith_mean
• qc_cmh_dew_point
• qc_wspd_vec_mean
• Wind direction vector mean(wdir_vec_mean)
• cmh_vapor_pressure
• qc_cmh_temp
• cmh_sat_vapor_pressure
• qc_wdir_vec_mean
• Wind speed vector mean(wspd_vec_mean)
• wdir_vec_std
• qc_cmh_rh
• cmh_temp
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• cmh_rh

NSA/MET/C1 - CMH Data Missing

The GFCI had tripped causing the CMH to lose power.  All CMH variables are missing except 
CMHRH which reports 100% for the entire time.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - CMH Sent to Vendor for Repair

CMH connector on the transmitter enclosure that goes to the head unit degraded and failed. 
 System was removed and sent to the manufacturer for repair.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - CMH offline

CMH removed for repair.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - 10m wind sensor offline

The 10m wind sensor values were 0 m/s and 000 for wind direction. The sensor lost 
communications.

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

NSA/MET/C1 - CMH offline

Beginning 1/24/2011, the CMH went offline resulting in missing temperature and dewpoint 
measurements and erroneous vapor pressure, saturation vapor pressure, and RH measurements. 

Problem fixed with a power cycle.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - CMH Failure

The Chilled Mirror Hydrometer (CMH) developed a short in the wiring harness. All CMH data 
missing or incorrect during the period listed.

• cmh_dew_point
• qc_cmh_dew_point
• qc_cmh_rh
• cmh_temp
• cmh_vapor_pressure
• qc_cmh_vapor_pressure
• qc_cmh_sat_vapor_pressure
• qc_cmh_temp
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - Wind sensor data missing

2m, 10m, 20m wind sensors went off-line 5/17 due to GFCI tripping caused by failing CMH.   
The 2m and 20m data wind sensor returned 6/6, but the 10m remained offline until 7/20 as 
the sensor was damaged.

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

NSA/MET/C1 - CMH communication failure

CMH lost communication with datalogger. All values from CMH were -6999 during this time 
resulting in the CMHRH flatlining at 100%. Communications was intermittent during entire 
time period.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - Frosting/Condensation

Beginning 20111108, the PWD began occasionally frosting over, signaling an alarm code and 
sometimes causing the PWD to stop reporting. A new PWD with hood heater attachment was 
installed 20130222.

• pws_precip_rate_mean_1min
• pws_cumul_snow
• pws_pw_code_15min
• PWS 10 minute mean visibility(pws_vis_mean_10min)
• pws_pw_code_inst
• pws_err_code
• pws_cumul_rain
• PWS 1 minute mean visibility(pws_vis_mean_1min)
• pws_pw_code_1hr

NSA/MET/C1 - CMH failure

Starting 14:17 GMT on 12/4/2011 the CMH Dew Point began reporting missing value, CMH 
relative humidity was flat-lining at 100% and CMH saturated vapor pressure was flat-lined at a 
high value.  This condition continued very intermittently for several months.  Issue was 
frosting and a failed ventilation fan.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - 10m wind data not reporting

10 meter wind speed and direction data were not reporting after a scheduled power outage 
took place.   Sensor was replaced.

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

NSA/MET/C1 - Incorrect liquid precipitation accumulation

A problem with the present weather detector's firmware caused negative precipitation 
accumulation to be recorded. The problem was fixed with a sensor swap.

• pws_cumul_rain

NSA/MET/C1 - Present Weather Detector testing

The present weather detector was undergoing testing during this time. The data is not 
representative of true conditions.

• pws_precip_rate_mean_1min
• pws_cumul_snow
• pws_pw_code_15min
• PWS 10 minute mean visibility(pws_vis_mean_10min)
• pws_pw_code_inst
• pws_err_code
• pws_cumul_rain
• PWS 1 minute mean visibility(pws_vis_mean_1min)
• pws_pw_code_1hr

NSA/MET/C1 - PWD failure

The PWD erroneously reported constant precipitation during the specified period.

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

NSA/MET/C1 - CMH failure due to icing

Snow/ice pack on the CMH causes instrument failure in adverse conditions. 

Use temp_mean, rh_mean, and vapor_pressure_mean from this datastream as a substitute.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - Power outage

Incorrect data due to power outage.

• cmh_dew_point
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• vapor_pressure_mean
• Wind speed vector mean(wspd_vec_mean)
• wdir_vec_std
• cmh_temp
• Wind direction vector mean(wdir_vec_mean)
• vapor_pressure_std
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - CMH humidity measurements suspect

During this time, the chilled mirror dew point, relative humidity, and vapor pressure data 
become stagnant following a period of high variability. Data begin to compare well with 
co-located sensors without interference.

• cmh_dew_point
• cmh_vapor_pressure
• cmh_rh

NSA/MET/C1 - Temp/RH instrument offline

• Temperature mean(temp_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_mean
• vapor_pressure_mean
• trh_err_code

NSA/MET/C1 - Reprocessing Notice (RID 1252)

See below for details of reprocessing that was completed on 20150109.  Original 
DQR category: 4 (Red, Incorrect).

-----------------------------------------------------------

The wind direction data are 30 degrees too high due to an alignment/offset problem during 
this time. Problem affects all 4 tower levels in the nsatwrC1.b1 datastream, as well as 
the wind direction data in the nsametC1.b1 datastream. Data will be reprocessed for 
correction.

• Wind direction vector mean(wdir_vec_mean)

NSA/MET/C1 - CMH offline

Moisture inside the power cable caused the instrument to go offline. The cable was 
replaced and data prior to the instrument self-check should not be used.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - CMH Dropout

The CMH readings dropped out for unknown sensor or power failures.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - All data missing or incorrect

All data were missing or incorrect during these periods, likely due to system power 
issues.

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

NSA/MET/C1 - CMH maintenance

CMH was offline due to maintenance. Data during this time are missing or incorrect.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure

NSA/MET/C1 - Unknown CMH problem

For an unknown reason, data spike during this time and are not representative of the 
environment.

• cmh_dew_point
• cmh_temp
• cmh_vapor_pressure
• cmh_rh
• cmh_sat_vapor_pressure