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)
• Pressure, atmospheric, constant value of model level, RUC model output(pres)
• Humidity, relative(rh)

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.

• 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
• 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)
• qc_wdir_vec_mean
• Mean Air Temperature or Hardware Error(temp_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 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
• qc_pws_vis_mean_1min
• pws_cumul_rain
• pws_pw_code_1hr
• Rain, surface, 1-min avg(pws_precip_rate_mean_1min)
• pws_cumul_snow
• 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.

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

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

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.

• Northward Wind Component(v_wind)
• wstat
• 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)
• qc_wdir_vec_mean
• Mean Air Temperature or Hardware Error(temp_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
• qc_pws_cumul_rain
• PWS 10 minute mean visibility(pws_vis_mean_10min)
• pws_err_code
• qc_pws_vis_mean_1min
• pws_cumul_rain
• pws_pw_code_1hr
• Rain, surface, 1-min avg(pws_precip_rate_mean_1min)
• pws_cumul_snow
• 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.

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• dew_point_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/TWR/C2  - Reprocess: 5m vapor pressure incorrect at temps above freezing

The 5m Vapor pressure calculation was in error for temperatures equal to or above 0C.  The 
2m Dew Point values were used for calculating the Vapor Pressure when the temps were 
equal to or above 0C.  

The following formula should be used to correct the data: 
 VP5M = (6.1365 (EXP((17.502*DP5M)/(240.97+DP5M))))*0.1.

• qc_vapor_pressure_mean
• vapor_pressure_std
• vapor_pressure_mean

NSA/TWR/C2 - 5m RH values Incorrect

The 5m RH sensor cap had fallen off and caused the 5m RH readings to be incorrect during 
times of high RH (>95%).

• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• rh_std
• qc_rh_mean

NSA/TWR/C1 - 40m T/RH Sensor Failure

40m RH data were very noisy after tower maintenance.  Following system re-boot, RH data 
were too high. Sensor was replaced.

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

NSA/MET/C2 - CMH Data Incorrect During Maintenance

Data was incorrect as the CMH was offline and undergoing maintenance.

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

NSA/TWR/C1 - 40m and 20m Data Incorrect

A power distribution problem required us to shut down power to the 40m level.  All T/RH 
were missing and the 40m wind sensor did not have heat to remove any ice build up.  All 
wind data from the 40m level should be viewed critically before use.  The 20m T/RH sensor 
was power spike when the problem occurred causing this sensor to become erratic.  
See D100302.2 for the continuation of the 40m problem.

• wdir_vec_std
• rh_std
• qc_rh_mean
• qc_wspd_arith_mean
• qc_temp_mean
• Wind direction, vector, lower, 1-min avg(wdir_vec_mean)
• vapor_pressure_mean
• vapor_pressure_std
• qc_wspd_vec_mean
• trh_err_code
• Wind speed, lower, 1-min avg(wspd_arith_mean)
• qc_wdir_vec_mean
• dew_point_mean
• qc_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
• qc_vapor_pressure_mean