Pressure jump at launch

The difference between the first pressure value reported by the sonde
after launch (992.7) and the surface value entered by the operator (997.5)
is somewhat greater than would normally be expected.  This may indicate
jarring of the pressure sensor at launch or misidentification of the
start time by the system.  The altitude values in the file will be incorrect
as well be the ascent rate values during the first 30 seconds of the
sounding.

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