Pressure jump at launch

The difference between the first pressure value reported by the sonde
after launch (968.0) and the surface pressure is greater than is expected.
The absolute altitude for this sounding and the ascent rate for the
first 30 seconds are questionable.

• -180.0 - +180.0(alt)
• V wind component(v_wind)
• Wind Direction(deg)
• Relative Humidity (hybrid-b grid)(rh)
• Ascent rate(asc)
• Easterly Wind Component(u_wind)
• Dewpoint Temperature(dp)
• Wind Speed(wspd)
• Retrieved pressure profile(pres)
• Wind status(wstat)
• Dry Bulb Temperature(tdry)

• (Raw data stream - documentation not supported)

• Wind Speed(wspd)
• Relative Humidity (hybrid-b grid)(rh)
• Wind status(wstat)
• Dry Bulb Temperature(tdry)
• Dewpoint Temperature(dp)
• Ascent rate(asc)
• Wind Direction(deg)
• Retrieved pressure profile(pres)
• -180.0 - +180.0(alt)