Using elements from various power sets, (primarily storm summoning and kinetic melee), I present my suggestion for a "Storm Manipulation" secondary set for Blasters:
1. Dust Devil - You surround your target with a highly localized whirlwind, which slows them, deals minor smashing damage, and reduces their chance to hit.
2. Storm Strike - Uses the animation from body blow, but deals smashing and cold damage. Also has a small chance to knock the target down.
3. Water Spout - You surround your target in a localized and rapidly churning water spout, holding them in place while dealing smashing and cold damage over time.
4. Build Up - Click power, +dmg, +tohit.
5. Burst - Similar to the kinetic melee power, only dealing smashing and cold damage.
6. Rejuvenating Mist - A toggle that provides additional recovery, some stealth, defense, and a HoT, with some minor resistance to sleep and disorient effects.
7. Thunder Clap - PBAoE disorient.
8. Tornado - As per the Storm Summoning power.
9. Storm Fist - Similar to Concentrated Strike from kinetic melee, only dealing smashing and energy damage instead.