Pressure jump at launch

The difference between the first pressure reported by the sonde after
launch (930.0) and that reported at the surface (935.7) is larger than
would be expected.  The altitude values for this sounding will be incorrect,
as will be the ascent rates for the first 30 seconds.  Some of the P, T, and
RH samples (most likely those nearest the ground) will be interpolated
values.

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