Slats
Regarding barometric pressure changes in a strong up drought. I am more concerned about the possible temperature change if entering a strong updraft. Apart from the up drought itself upsetting the aircraft, that temperature rise will play havoc if you are struggling along with 1.3 G protection at say ISA. If the ambient temperature is suddenly ISA +10c (not unheard of) or ISA +05c.
The above example is just one reason to consider an even lower altitude, if "caught out". Sure you're in for a rough ride but the chances of staying in control and not departing are so much greater.