It is a bit narrow. That's probably due to a holdover from when I was attempting to convert all classes to ToB, including spellcasters.
Now I'm thinking of just making it...
Storm Kinship: Weather (storms, tornadoes, blizzards, hurricanes, etc.), Electricity, Lightning, Wind, Snow, Cold
Of course doing that would really eat into Warmage Edge, maybe to the point of obsoleting it. With this change I'm seeing water and earth taken by Earth Mother, air, cold and electricity taken by Storm Kinship (with a few sonic ones thrown in for thunder) out of the elemental types Warmage Edge was using. Fiendish Damnation could also absorb fire with some acid and cold crossovers. Sonic is the big one that's really missing a home if Warmage Edge goes away.
If Warmage Edge does go away I'm thinking of replacing it with Golden Aegis: protection, deflection, resistances, counterspell, dispel. This might work even though it means a change of direction on sprinkling defensive spells throughout the other schools.