NSA/METTOWER - Questionable NSA Met-tower wind data

The data analysis software for the NSA Met_tower system was upgraded at 2200 GMT
on 8 SEP 1999.  The upgrade included replacement of missing data with -99.99's
when the routine that polled the Met-tower sensors timed out.  This 
resulted in large negative spikes in the 1-min averages.  These spikes 
almost always occurred during the first several 1-min periods of a 
half-hour data processing routine.
On 25 OCT 1999 at 2300 the routine that replaced missing data was changed to 
insert the previous 1-min averaged data instead of -99.99.  Since at the most
only one or two values are missing in ay averaging period, this change 
results in a reasonable estimate of the true mean values

All NSA Met-tower data taken during this period should be 
flagged as requiring scrutiny before acceptance.

• North Latitude(lat)
• Wind Direction out of range error(win_dir_out_of_range_error)
• Atmospheric pressure(atmos_pressure)
• Temperature mean(temp_mean)
• Raw data filename(filename)
• -180.0 - +180.0(alt)
• Air Temperature out of range error(temp_out_of_range_error)
• Std Dev of Air Temperature(temp_sd)
• Wind Speed out of range error(win_spd_out_of_range_error)
• Std Dev of Dew Point Temperature(dew_pt_temp_sd)
• Minimum Vapor Pressure(vap_pres_min)
• Mean Dew Point Temperature(dew_pt_temp_mean)
• PTB Serial Error(atmos_pressure_PTB_serial_error)
• Dew point temperature out of range error(dew_pt_temp_out_of_range_error)
• Minimum Dew Point Temperature(dew_pt_temp_min)
• Maximum Wind Speed(wind_spd_max)
• Relative humidity minimum(relh_min)
• Std Dev of Wind Speed(wind_spd_sd)
• Vapor Pressure out of range error(vap_pres_out_of_range_error)
• Number of timeouts reading the met tower data by height(read_timeout_count)
• Maximum Vapor Pressure(vap_pres_max)
• base time in epoch(base_time)
• Internal Temperature out of range error(internal_temp_out_of_range_error)
• Relative humidity out of range error(relh_out_of_range_error)
• Out of Range Error(atmos_pressure_out_of_range_error)
• Relative humidity mean(relh_mean)
• mifkbum temp between outputs(temp_min)
• Maximum Wind Direction(wind_dir_max)
• Mean Vapor Pressure(vap_pres_mean)
• Wind speed vector average(wind_spd_vec_avg)
• Read Timeout Error(atmos_pressure_read_timeout_error)
• Relative humidity maximum(relh_max)
• Dew Point Temperature Hardware Error(dew_pt_hardware_error)
• Internal Voltage out of range error(internal_voltage_out_of_range_error)
• Wind direction standard deviation(wind_dir_sd)
• Std Dev of Vapor Pressure(vap_pres_sd)
• Wind direction vector average(wind_dir_vec_avg)
• lon(lon)
• Std Dev of Relative Humidity or Hardware Error Code(relh_sd)
• Minimum Wind Speed(wind_spd_min)
• Mean Wind Speed(wind_spd_mean)
• Air Temperature Hardware Error(temp_hardware_error)
• Time offset from base_time(time_offset)
• Maximum Dew Point Temperature(dew_pt_temp_max)
• Minimum Wind Direction(wind_dir_min)
• Temperature maximum(temp_max)

• (Raw data stream - documentation not supported)