NSA/SONDE/C1 - Increased precision for alt, dp, pres, rh, tdry

The output precision of the following variables was increased 20060929:

   alt	changed from 1m to 0.1m
   dp	changed from 0.1degC to 0.01degC
   pres changed from 0.1 hPa to 0.01 hPa
   RH	changed from 1%RH to 0.01%RH
   tdry changed from .1degC to 0.01degC

Note that the increase in precision does not necessarily imply an increase
in accuracy.  Users are cautioned to continue to use their best scientific
judgement when using these or any other data.

• alt
• Dry Bulb Temperature(tdry)
• Dewpoint Temperature(dp)
• Humidity, relative(rh)
• Pressure, atmospheric, constant value of model level, RUC model output(pres)

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
• PWS 10 minute mean visibility(pws_vis_mean_10min)
• qc_pws_cumul_rain
• pws_err_code
• qc_pws_vis_mean_1min
• pws_cumul_rain
• pws_pw_code_1hr
• pws_cumul_snow
• Rain, surface, 1-min avg(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 data missing

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_sat_vapor_pressure
• cmh_rh

NSA/SONDE/C1 - Wind data missing

A GPS problem associated with Vaisala BBSS ground station software issues caused the 
ground stations to enter into an error state when using GPS wind finding. In some instances, 
the flight was aborted due to the error state and not data was collected.  A workaround 
was developed to allow sondes to be launched without collecting wind data.

• wstat
• Northward Wind Component(v_wind)
• Eastward Wind Component(u_wind)
• Mean Wind Speed(wspd)

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.

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

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

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
• PWS 10 minute mean visibility(pws_vis_mean_10min)
• qc_pws_cumul_rain
• pws_err_code
• qc_pws_vis_mean_1min
• pws_cumul_rain
• pws_pw_code_1hr
• pws_cumul_snow
• Rain, surface, 1-min avg(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_sat_vapor_pressure
• cmh_rh

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.

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

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

NSA/SONDE/C1 - Wind data missing

After some power disruptions, the Power Supply board of the SPS220 ground station was 
damaged.  The damage caused the supply to not have enough power to run the GPS board.  
Switching to the back up DigiCora II did not alleviate the problem as the fix for GPS failure 
to all Vaisala sonde products had not been installed.  A different P/S was found and sent 
up to replace the failed one.

• Wind Direction(deg)
• Northward Wind Component(v_wind)
• Eastward Wind Component(u_wind)
• Mean Wind Speed(wspd)

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, lower, 1-min avg(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_sat_vapor_pressure
• cmh_rh

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_sat_vapor_pressure
• cmh_rh

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_sat_vapor_pressure
• cmh_rh

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)
• Wind speed vector mean(wspd_vec_mean)
• qc_wspd_arith_mean
• wdir_vec_std
• qc_wspd_vec_mean
• Wind direction, vector, lower, 1-min avg(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_sat_vapor_pressure
• cmh_rh

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_sat_vapor_pressure
• cmh_rh

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, lower, 1-min avg(wdir_vec_mean)

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

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