Yes, if he does not hit 90 tomorrow is it is not only ruined, it is invalidated. It goes from Heat Wave to two yawner AN days. Most of us just west of the LSV have already lost the heat wave designation unless Thursday is a big surprise.
Someday I hope to figure out the HIA phenomena. This rise level seems to go hand in hand with other areas but on so many of these hot days an output of a temp map shows areas well to your south and east being several degrees cooler.
Sorry to hear about your diagnosis. I do not have any experience with the med's you mentioned but I do have experience with hoping and praying people get better so I will be part of that in sending well wishes your way. .
I will go out and predict Thursday is no where near 90 for us (or probably the LSV either) so not going to technically score a heat wave with this one.
Rgem has the LSV into the 90's today and mid to upper 90's Tue and Wed. American's will have none of it with the GFS in the low 80's today and low to mid 80's Wed.