NSA/C2 - Missing met, pws, snodep data due to comm error

An error in the communication sub-routine
of the Bridgeview collection software occurred
resulting in data loss from the Snow Depth
sensor, Present Weather Sensor and the 
Barometer.

• Snow Depth internal QC number(snow_depth_internal_QC)
• SR50 Serial Error(snow_depth_serial_error)
• Out of Range Error(snow_depth_out_of_range_error)
• Read Timeout Error(snow_depth_read_timeout_error)
• Snow Depth(snow_depth)

• Cumulative Snow(cumulative_snow)
• Cumulative Snow out of range error(cumul_snow_out_of_range_error)
• One Minute PW code out of range error(one_min_pw_code_out_of_range_error)
• one Minute Visibility(one_minute_visibility)
• One Hour PW code out of range error(one_hour_pw_code_out_of_range_error)
• PWS Precipitation Rate out of range error(precip_rate_out_of_range_error)
• One Minute Visibility out of range error(one_minute_vis_out_of_range_error)
• Precipitation rate(precip_rate)
• NWS code(present_weather_sensor_NWS_code)
• Present Weather Sensor Serial Error(pws_serial_error)
• Cumulative Liquid Water Equivalent(cumul_liq_water_equiv)
• Ten Minute PW code out of range error(ten_min_pw_code_out_of_range_error)
• One Hour PW code \\(WMO SYNOP code\\)(one_hour_PW_code)
• Liquid Water Equivalent out of range error(cumul_liq_water_equiv_out_of_range_err)
• Ten Minute Visibility out of range error(ten_minute_vis_out_of_range_error)
• Ten Minute PW code \\(WMO SYNOP code\\)(ten_minute_PW_code)
• One Minute PW code \\(WMO SYNOP code\\)(one_minute_PW_code)
• Ten Minute Visibility(ten_minute_visibility)
• Present Weather Sensor Read Timeout Error(pws_read_timeout_error)

• Read Timeout Error(atmos_pressure_read_timeout_error)
• Barometric Pressure(atmos_pressure)
• PTB Serial Error(atmos_pressure_PTB_serial_error)
• Out of Range Error(atmos_pressure_out_of_range_error)

• Barometric Pressure(atmos_pressure)
• Read Timeout Error(atmos_pressure_read_timeout_error)
• PTB Serial Error(atmos_pressure_PTB_serial_error)
• Out of Range Error(atmos_pressure_out_of_range_error)

• One Minute Visibility out of range error(one_minute_vis_out_of_range_error)
• One Minute PW code \\(WMO SYNOP code\\)(one_minute_PW_code)
• One Hour PW code out of range error(one_hour_pw_code_out_of_range_error)
• Cumulative Snow out of range error(cumul_snow_out_of_range_error)
• Ten Minute Visibility(ten_minute_visibility)
• one Minute Visibility(one_minute_visibility)
• Ten Minute PW code out of range error(ten_min_pw_code_out_of_range_error)
• Present Weather Sensor Read Timeout Error(pws_read_timeout_error)
• Liquid Water Equivalent out of range error(cumul_liq_water_equiv_out_of_range_err)
• base time(base_time)
• Cumulative Liquid Water Equivalent(cumul_liq_water_equiv)
• Cumulative Snow(cumulative_snow)
• Present Weather Sensor Serial Error(pws_serial_error)
• One Minute PW code out of range error(one_min_pw_code_out_of_range_error)
• NWS code(present_weather_sensor_NWS_code)
• Ten Minute Visibility out of range error(ten_minute_vis_out_of_range_error)
• Ten Minute PW code \\(WMO SYNOP code\\)(ten_minute_PW_code)
• Precipitation rate(precip_rate)
• One Hour PW code \\(WMO SYNOP code\\)(one_hour_PW_code)
• PWS Precipitation Rate out of range error(precip_rate_out_of_range_error)

NSA/METTWR/C1  -  C1/METTWR PRESSURE DATA MISSING AND INCORRECT

Starting at 0501 UTC on 05/21, pressure readings frequently are out of tolerance.  The 
read timeout value had changed from 250 ms to 150 ms.  Changed the read time out back to 250 
ms.  Unknown as to how read timeout values changed.

• Barometric Pressure(atmos_pressure)

• Barometric Pressure(atmos_pressure)

NSA/METTWR/C1 - Chilled Mirror transmit logic board chipset unsuited for Arctic 
temperatures

Data missing due to problems with manufacturer's transmit logic board chipset.  They were 
generic chips not rated for Arctic temperatures.

• Chilled Mirror Calculated Relative Humidity(CMHRH)
• Chilled Mirror Dew Point(CMHDP)
• Chilled Mirror Temperature(CMHTemp)
• Chilled Mirror Calculated Saturation Vapor Pressure(SatVPCMH)

NSA/METTWR/C2 - Chilled Mirror grounding and timing issues

From beginning of data stream, the chilled mirror data was intermittent at best.  Problems 
with grounding and timing issues between logging instruments caused data to be incorrect 
and at times missing.

• Chilled Mirror Temperature(CMHTemp)
• Chilled Mirror Calculated Saturation Vapor Pressure(SatVPCMH)
• Chilled Mirror Calculated Vapor Pressure(VPCMH)
• Chilled Mirror Calculated Relative Humidity(CMHRH)
• Chilled Mirror Dew Point(CMHDP)

NSA/METTWR/C1 - Incorrect Maximum for Precip Values

The max values for cumulative rain sum of 99 mm and the rain rate of 999 mm/hr are 
incorrect.  In communication with the manufacturer it has been found that the manual was in 
error.  The actual max values of the cumulative rain sum is 99.99 mm and the rain rate is 
999.99 mm/hr.

• Precipitation Rate(PcpRate)
• Cumulative Water Sum(CumH2O)

NSA/METTWR/C2 - Incorrect Maximum for Precip Values

The max values for cumulative rain sum of 99 mm and the rain rate of 999 mm/hr are 
incorrect.  In communication with the manufacturer it has been found that the manual was in 
error.  The actual max values of the cumulative rain sum is 99.99 mm and the rain rate is 
999.99 mm/hr.

• Precipitation Rate(PCPRate)
• Cumulative Water Sum(CumH2O)

NSA/METTWR/C1 - Data 1-minute behind

Data from the Barometer, Chilled Mirror Hygrometer and the Present Weather Sensor were 
one-minute behind due to timing problems collecting data from the Serial Data Multiplexer 
that handled these sensors.

• 15 minute Present Weather Code(PwCod15mi)
• 1 minute Average Visibility(AvgVis1mi)
• Chilled Mirror Dew Point(CMHDP)
• Instant Present Weather Code(InstPwCod)
• Chilled Mirror Calculated Saturation Vapor Pressure(SatVPCMH)
• Chilled Mirror Calculated Relative Humidity(CMHRH)
• Chilled Mirror Calculated Vapor Pressure(VPCMH)
• 1 hour Present Weather Code(PwCod1hr)
• Cumulative Snow Sum(CumSnow)
• 10 minute Average Visibility(AvgVis10m)
• Chilled Mirror Temperature(CMHTemp)
• Precipitation Rate(PcpRate)
• Cumulative Water Sum(CumH2O)
• Present Weather Sensor Alarm(PWSAlarm)
• Atmospheric Pressure(AtmPress)

NSA/METTWR/C1 - Reprocess: Wind direction data incorrect

Wind direction data is off by 30 degrees for all wind sensors.  The 40-m tower was 
misaligned to true north.

• 40m Vector Averaged Wind Direction(WD40M_DU_WVT)
• 2m Vector Averaged Wind Direction(WD2M_DU_WVT)
• 20m Vector Averaged Wind Direction(WD20M_DU_WVT)
• Sonic Vector Averaged Wind Direction(SonicWD_DU_WVT)
• 10m Vector Averaged Wind Direction(WD10M_DU_WVT)

NSA/METTWR/C1 - Reprocess: Barometric Data Changed from hPa to kPa

Barometric pressure data was converted from hPa to kPa in order to standardize the 
measurement units among ARM sites and to conform to accepted standard units determined by the 
scientific community.

• Atmospheric Pressure(AtmPress)

NSA/METTWR/C2 - Reprocess: Barometric Data Changed from hPa to kPa

Barometric pressure data was converted from hPa to kPa in order to standardize the 
measurement units among ARM sites and to conform to accepted standard units determined by the 
scientific community.

• Atmospheric Pressure(AtmPress)