TWP/SONDE/C1 - Bad RH at beginning of sounding

It appears that the RH sensor heating circuit failed during this portion of the sounding 
(approximately between 0km and 11km).  The RH oscillates rapidly between low (~5 %RH) and 
not so low (~70 %RH) and the oscillation seems to stop when the temperature is below ~40 
degC.  According to Vaisala these are symptoms of failure in the ASIC (application 
specific integrated circuit) that controls the heating.

Some data may be recovered by analysis of the raw data.  The RH also might be 

recovered (though at some degrading of the vertical resolution) by choosing only the highest RH 
values within each two-minute period of the sounding in this area.

• dp
• rh