/Sonic resistance debuffs & Freezing Rain
/Ice slows and rains with Storm's slows and rains
/Energy knockback with Storm chaos
Those are the ones that spring to my mind.
If we are to die, let us die like men. -- Patrick Cleburne
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The rule is that they must be loved. --Jayne Fynes-Clinton, Death of an Abandoned Dog
/Sonic has great synergy with storm.
that knockback choas mentioned above is also an option for /sonic with shockwave. Same with the AOE stun(theres an ST one in screech and an AOE one in the nuke) Also, sonic is very ST oriented, while storm has a couple of AOE damage powers... which are boosted by all of sonic -res.
And if you leave storm and sonic with their original colors it looks really cool 
If we are to die, let us die like men. -- Patrick Cleburne
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The rule is that they must be loved. --Jayne Fynes-Clinton, Death of an Abandoned Dog
Sonic, ice, and dark.
Dark has always been the one with the most notable synergy with storm summoning due to tenebrous tentacles. It's an area immobilize that doesn't remove knockback, so it's perfect with freezing rain.
Dark Blast also has Tenebrous Tentacles. Immobilization makes Hurricane easier to use. Because enemies get their full movement speed back while repelled, that makes it difficult to herd enemies precisely with Hurricane unless they're held, KD or rooted. In theory, TT also helps Freezing Rain, though in practice, FR usually doesn't need the help.
Storm also has good synergy with Archery AR BR DP Energy Fire Ice and Psi, since Archery AR BR DP Energy Fire Ice and Psi like to be at medium range to fire cones, and Storm reliably locks entire spawns down at any distance. AR Fire and Ice get special mention since Storm gives enemies a hard time getting out of their rains.
To be honest, I don't think there's any secondary that doesn't synergize with Storm in some way. Even poor little Elec gets the benefit of stacking end drain and recovery debuffs with Lightning Storm. For what that's worth.
And Storm/Rad? Well if you roll Storm/Rad you're well into "who needs synergy?" territory anyway... but there's also TC+CB stun stacking to hard mez a boss if you need to.
My first Storm, my first 50, is a Storm/Rad. I liked from the early levels that radiation blast did defense debuffing, prior to beginner's luck. Freezing rain with radiation blast like neutron bomb does make a difference on targets that resist defense debuffing. Rad blast is also low on end cost for neutrino bolt and x-ray beam. Neutrino bolt is also good to mule the devastation hold proc and other handy procs if you want. A number of rad blasts are also short on animation time, good for the mobile, active stormy.
Triumphant Defenders Forever
Psylenz FF/Psi, ArticQuark Storm/Rad, Symon BarSisyphus Bots/psn, Max VanSydow Thugs/Dk, Cyclone Symon Bots/stm, Blue Loki Ice/Cd, Widow 46526
HelinCarnate:OMG it is so terrible. I have the option to take 3 more powers but no additional slots. Boo F'ing hoo.
I know that Elec does not mix well with Storm...
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Just a quick note, on the synergy of /ice. If you go with /ice, the synergy is not so much in the slows (Storm can floor movement and recharge on non AVs enemies without a secondary) but rather because ice storm and blizzard use blaster modifiers and are therefore more powerful than they should be on a Storm Defender which couples incredibly well with Freezing Rain's resistance debuffs. As Rigel mentioned, storm's general ability to keep things in rains helps as well.|
Originally Posted by Blue_Fenix
As the title says, I'm considering taking another stab at rolling up a Stormie and wondering what, if any, blast sets have particular synergy with it. Dark Blast comes to mind due to Dark Pit + Thunderclap giving you a way to stack AoE disorient. Any others?
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/dark also gives you additional -to-hit to contribute to the defense from hurricane + steamy mist.
Honestly though, as Rigel said, you can pick just about any secondary and be fine. I've enjoyed my time tremendously as a storm/psy, although its synergy is not as high as some sets.
Draggynn on Virtue: lvl 50 Storm/Psi, 1389 badges
Draggynn's Guide to Storm Summoning(Gale-Tornado, updated 6/25/2011)
Avatar by Wassy full reference here
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I have a 41 storm/Electric defender and do not agree.|
Originally Posted by Angelxman81
I know that Elec does not mix well with Storm...
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I do very well. Electric blasts, like storm include some soft control. Some end drain/recovery, and the little electric pet that follows you around and auto fires, that goes very well with storm's other pseudo pets.
You can also put a chance to stun/hold proc in just about everything and that really inhibits the mobs.
As the title says, I'm considering taking another stab at rolling up a Stormie and wondering what, if any, blast sets have particular synergy with it. Dark Blast comes to mind due to Dark Pit + Thunderclap giving you a way to stack AoE disorient. Any others?