A Lightning/Blizzard sorc is possible, but you don't hear much about it because it's not the most efficient build out there. The thing with Sorceress skills is they fall into 4 different categories.
Category 1- Very Synergy Dependent (require 60+ skill points to achieve good killing speed in Hell, if you want to rely on this skill as a primary skill)
Frost Nova
Ice Blast
Glacial Spike
Blizzard
Charged Bolt
Lightning
Chain Lightning
Fire Bolt
Fireball
Meteor
Enchant
Hydra
Category 2- Medium Synergy Dependence (require ~40 skill points to achieve good speed as a primary skill, but often requires a lot of special gear)
Nova
Blaze
Energy Shield
Thunderstorm
Category 3- Super Cheapo Skills! (can kill just fine in Hell with just 20 points in the skill and 1 point in Mastery)
Frozen Orb
Firewall
Category 4- Miscellania (Utility skills, 1-point wonders, and skills that are useless on their own as a primary skill).
Ice Bolt
Frozen Armor
Chilling Armor
Shiver Armor
Telekinesis
Static Field
Teleport
Warmth
Inferno
Fire Mastery
Cold Mastery
Lightning Mastery
Typically, Sorceress builds will either pick a skill from Category 1 and spend 80+ points, becoming a single-tree sorc, or else they'll pick a skill from Category 1 and spend 60 points, pairing it with a Category 3 skill and become a dual-tree build. Rarely, you'll see a Tri-Elementalist composed mostly of Category 2 and Category 3 skills. A Lightning/Blizzard Sorc would be a Sorc who takes two category 1 skills and underdevelops both of them. It'll work, but it won't exactly knock your socks off.