Pressure jump at launch

The difference between the first pressure value reported after launch
(940.8) and the surface pressure (946.8) is greater than expected.  The
absolute altitude for this sounding and the ascent rate for the first
30 seconds are questionable.

• rh
• lat
• base_time
• tdry
• deg
• pres
• lon
• asc
• wstat
• wspd
• dp
• alt
• time_offset

• u_wind
• tdry
• pres
• alt
• asc
• dp
• deg
• rh
• wstat
• base_time
• wspd
• lon
• v_wind
• time_offset
• lat

• Raw data stream - documentation not supported