TWP/MET/C3 - Incorrect ORG data

Sprinkler was in the path of the ORG, giving false precipitation data.

• Precipitation mean(precip_mean)
• qc_precip_mean
• qc_precip_max
• qc_precip_min
• precip_std
• Rain, surface, 1-min minimum(precip_min)
• Precipitation maximum(precip_max)

TWP/MET/C2 - T/RH loose connection

Site ops observed abnormal reporting and found a loose connection of the T/RH probe to the 
data logger.

• rh_std
• Temperature mean(temp_mean)
• temp_std
• Vapor pressure mean, calculated(vapor_pressure_mean)
• Humidity, relative, at 2-m height, 1-min avg(rh_mean)
• vapor_pressure_std

TWP/MET/C1 - Blockage in tipping bucket rain gauge

Debris in the tipping bucket rain gauge caused slow filtration of precip. As a result, the 
tipping mechanism was slow to tip and register timely precipitation values.

• qc_tbrg_count_total
• qc_tbrg_precip_total

TWP/DISDROMETER/C3 - Debris in cone

The instrument sensor failed due to debris in cone.  Clogs cleared 2/1.

• num_drop
• distribution_slope
• distribution_intercept
• number_density
• mean_diam_drop_class
• Precipitation(precip_dis)
• fall_velocity
• Rainfall rate(rain_rate)
• energy_flux
• radar_reflectivity
• delta_diam
• liq_water
• diam_max
• drop_class

TWP/DISDROMETER/C3 - Precipitation not recorded

Instrument stopped recording precipitation during precipitation event on 3/10. No 
precipitation was recorded during rainfall in the days following this failure. Observations 
resumed on 03/18/2013.

• num_drop
• distribution_slope
• energy_flux
• radar_reflectivity
• distribution_intercept
• number_density
• diam_max
• liq_water
• mean_diam_drop_class
• drop_class
• Precipitation(precip_dis)
• fall_velocity
• Rainfall rate(rain_rate)

TWP/MET/C1 - ORG data unreliable

During this time the optical rain gauge reports precipitation in clear conditions.

Use the present weather detector and/or tipping bucket rain gauge data from this data 
stream, or twpvdisC1.b1 or twprainC1.b1 as references for precipitation data.

• Precipitation maximum(precip_max)
• precip_std
• Rain, surface, 1-min minimum(precip_min)
• Precipitation mean(precip_mean)

TWP/MET/C1 - Incorrect precip data

A blocked syphon caused delays in precipitation recording. The times at which 
precipitation was recorded may be incorrect.

• tbrg_precip_count
• tbrg_precip_total

TWP/MERGESONDE/C3 - Reprocess: Missing precip data

The VAP was incorrectly ingesting precipitation data from the co-located MET/SMET 
datastreams and all precip values are missing.  

Also, in all mergesonde files with process_version vap-mergesondemace-1.0-0.sol5_10, the 
qc_precip indicate the data are missing data while the precip values are set to 0. Given 
the description in the qc_precip field, these precip values should be set to -9999.  

Here is a breakdown of the problems:
20090101-20110101, no version listed, all precip values flagged as missing and correctly 
set to -9999

20110101-20111129, vap-mergesondemace-1.0-0.sol5_10, qc_precip flagged as missing but 
values set to 0

The VAP has been corrected and the data will be reprocessed shortly.

• Precipitation, total, derived from ETA model(precip)

TWP/MET/C1 - PWD reporting low precipitation

The PWD reported much lower precipitation values than co-located sensors. A mud wasp nest 
was removed from the lens. This may have affected visibility values as well.

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

TWP/MET/C1 - Atmospheric pressure data missing

Atmospheric pressure data is missing during this time. Cause of the outage is unknown.

• Atmospheric pressure(atmos_pressure)

TWP/MET/C1 - PWD not reporting

A wasp nest was obstructing the present weather detector lenses during this time.

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

TWP/MERGESONDE/C1 - Reprocess: Suspect rh_scaled values

MERGESONDE sometimes uses bad or questionable precipitable water vapor data to scale the 
relative humidity profiles provided by the rh_scaled field. In addition, this bad input 
data is not properly indicated by the vapor_source or qc_rh_scaled fields. This problem 
appears to typically occur when there is moisture impacting the microwave radiometer causing 
large spikes in brightness temperatures. During these periods the rh_scaled values are 
often saturated at 101% for much of the profile.

• rh_scaled
• vapor_source

TWP/MERGESONDE/C2 - Reprocess: Suspect rh_scaled values

MERGESONDE sometimes uses bad or questionable precipitable water vapor data to scale the 
relative humidity profiles provided by the rh_scaled field. In addition, this bad input 
data is not properly indicated by the vapor_source or qc_rh_scaled fields. This problem 
appears to typically occur when there is moisture impacting the microwave radiometer causing 
large spikes in brightness temperatures. During these periods the rh_scaled values are 
often saturated at 101% for much of the profile.

• rh_scaled
• vapor_source