SGP/SONDE - Pressure jump at launch/incorrect surface values

There are two problems here.  First, the operator entered the values
of PTU obtained from the THWAPS as the surface values for this sounding
instead of the sonde values.  In doing so, the surface pressure was
entered incorrected (OMIS log shows both sonde and THWAPS at 969.0),
surface value is entered as 969.9.  The second problem is that apparently
the system misidentified the time of release and as a result the ascent
rates are wrong for the first 30 seconds.  The time of release problem
was caused because the operator started a new sonde instead of resetting
the system.  I am assuming that the values of PTU are correct, but I
have no way of knowing the relationship betweeen the time into the
sounding and the actual altitude/pressures.  It seems likely that the
altitudes are OK but that they do not correspond to the actual times
after phyical launch.

• Retrieved pressure profile(pres)
• North Latitude(lat)
• Dry Bulb Temperature(tdry)
• -180.0 - +180.0(alt)
• Ascent rate(asc)
• Dewpoint Temperature(dp)
• Time offset from base_time(time_offset)
• base time in epoch(base_time)
• Wind Direction(deg)
• Easterly Wind Component(u_wind)
• Wind status(wstat)
• Relative Humidity (hybrid-b grid)(rh)
• lon(lon)
• V wind component(v_wind)
• Wind Speed(wspd)

• (Raw data stream - documentation not supported)

• base time in epoch(base_time)
• Relative Humidity (hybrid-b grid)(rh)
• Wind Speed(wspd)
• Wind Direction(deg)
• lon(lon)
• Ascent rate(asc)
• Time offset from base_time(time_offset)
• Dry Bulb Temperature(tdry)
• North Latitude(lat)
• Wind status(wstat)
• Dewpoint Temperature(dp)
• Retrieved pressure profile(pres)
• -180.0 - +180.0(alt)