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: )
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 SGP at 1 km and Example at NSA at 1km )
Wind speed Example at 1 km
Temperature values are not affected as severely as other variables (Example at NSA and Example at SGP 1 km height.)