You can't have an excess of food and famine at the same time. There are no records of famine, in fact food prices were dropping. (https://www65.statcan.gc.ca/acyb02/1937/acyb02_19370800009a-...)

All first hand accounts of the dust bowl talk about sandstorms bringing sand, everything getting burried in sand. No first hand accounts seem to talk about fields getting stripped of soil, that was documented after the fact. This suggests that the source of the dust were fields that had been abandoned.

It doesn't even make sense, Oklahoma isn't dry, the American south is very humid.