Observed BUF sounding
Notes:
This observed sounding, taken at 17 UTC on the 16th at BUF, shows a layer of very dry air in the hail growth zone between -10 and -30 degrees C. Lapse rates appear to be moderately steep. A deep layer of very dry air is evident above 850 mb. This would be the source for the increasingly dry air observed at the surface that may have mixed down from aloft.
Slide 11