IonStorms

Flag:	IonStorms
File(s):	Maps
Values:	Boolean values: yes or no, true or false, 1 or 0
Default:	yes
Applicable to:	SpecialFlags, General
Logic related to IonStorms, as a whole or in part, is obsolete in Tiberian Sun, Red Alert 2 and/or Yuri's Revenge.

Presumably, this was meant as a multiplayer option to create random Ion Storms on the map. While the flag is read, it does nothing, therefore it's obsolete.