SGP/MERGESONDE/C1 - Inconsistencies at day boundaries.

Please be aware that there are often inconsistencies at the boundaries between UTC days. 
The severity is dependent on the data variable and the number of sonde launches per day. 
Relative humidity, dew point, wind speed and wind direction are most affected. 

The contribution from sonde data is highest near the sonde times, then decreasing 
strongly. (Example of sonde contribution to value at 1 km height: 

http://dev.arm.gov/~monroe/dq_inspector/plots/mergesonde_1116_disc/nsa/nsamergesonde1maceC1.c1/nsamergesonde1maceC1.c1.sonde_fraction_height_1p008.20150601_20150607.png)

Relative humidity at NSA can have large discontinuities at the UTC date boundaries due to 
only having two sonde launches per day. When weather or instrument malfunction reduce the 
number of launches the discontinuity can increase. (Example at 1 km: 

http://dev.arm.gov/~monroe/dq_inspector/plots/mergesonde_1116_disc/sgp/sgpmergesonde1maceC1.c1/sgpmergesonde1maceC1.c1.rh_qc_tests_height_0p998.20150601_20150607.png and 

https://engineering.arm.gov/~ttoto/dq_inspector/plots/nsa/nsamergesonde1maceC1.c1/nsamergesonde1maceC1.c1.rh_qc_bits_pcolor.20110901_20110905.png)

Wind speed example at 1 km height: 

http://dev.arm.gov/~monroe/dq_inspector/plots/mergesonde_1116_disc/sgp/sgpmergesonde1maceC1.c1/sgpmergesonde1maceC1.c1.wspd_qc_tests_height_0p998.20150601_20150607.png

Temperature values are not affected as severely as other variables 

(https://engineering.arm.gov/~ttoto/dq_inspector/plots/nsa/nsamergesonde1maceC1.c1/nsamergesonde1maceC1.c1.temp_qc_bits_pcolor.20110901_20110905.png and 1 km height example 

http://dev.arm.gov/~monroe/dq_inspector/plots/mergesonde_1116_disc/sgp/sgpmergesonde1maceC1.c1/sgpmergesonde1maceC1.c1.temp_qc_tests_height_0p998.20150601_20150607.png)
.

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• Relative Humidity (hybrid-b grid)(rh)
• Total precipitation over one minute sampling period(precip)
• Source of the MWR Data used to Produce Scaled RH Field(vapor_source)
• Wind Speed(wspd)
• Specific Humidity(sh)
• Scaled final corrected ambient relative humidity(rh_scaled)
• Height(height)
• V wind component(v_wind)
• Sonde contribution to the new rh(sonde_fraction_rh)
• Sonde contribution to the new data point(sonde_fraction)
• Environmental Temperature (hybrid-b grid)(temp)
• Barometric pressure(bar_pres)
• Vapor Pressure (kiloPascals)(vap_pres)
• Potential temperature(potential_temp)
• Easterly Wind Component(u_wind)
• Wind Direction(wdir)
• Dewpoint Temperature(dp)