Storm is good at split-pushing and ganking, has great mobility, low CDs, viable damage output in the late game..
Although he is hard to get farm and XP out of the lane, has weak early game and requires mana management and general mechanics.

Storm is strong against splitpushers that play solo away from their team. (Tinker, NP, Invoker, QoP, Brood, MK, Morph), squishy heroes that stay behind (Sniper, Zeus, AW, Drow), carries that are easily kited (Slark, Spectre, Ursa, Troll), generally against melee cores which he can harass with Q (Alch, BS, Brew) and some range that he can outtrade (Mirana, Invoker), lineups that lack disables (Warlock, SD, AA, Phoenix, Lich, Pugna).

Storm is good with carries that can provide damage for buildings after your get a pick-off or split-push, heroes that can set up ganks for you and find enemy heroes (WK, BH, Nyx, Clockwerk or even LS, Spectre), heroes that can help to kill the target quickly ,for example that can get to you quickly and blow up the target, roamers that can help to secure lane (Shaker, SB, Riki), heroes that provide mana (KotL, CM, IO), Some combo heroes (Silencer, Kunkka).

Storm is bad against heroes with many roots, silences and general disables (Meepo, Ember, Treant, Silencer, Earth Spirit, NS, Doom, Riki, Lion), heroes that can't be bursted down quickly (Abaddon, Omniknight, Huskar, Tide, Underlord), mana drainers (AM, Nyx), heavy-pushing lineups, heroes that like to build Pipe or Orchid.

Storm is bad with cores that need a lot of farm ( AM, PL, AW), and heroes that have no depush abilities.

Bad lane matchups are against heroes like Necro, Puck, DP, QoP, Viper, Veno, that can long range and can zone him easily, have better A-click or can deal serious damage by skills. Ember and DK can sustain his remnants.

Generally you should pick Storm when enemy team lack lockdowns or in general lack ways to prevent you from split-pushing or lack ways to prevent you from going on heroes and killing them quickly...in other words: squishy heroes without lockdown (AA, Enchantress, Undying), heroes that stay back in the fight or splipush alone (Sniper. Drow, NP) and don't pick against several heroes with hard disables (NA, NS), or "catchers" (Batrider, Disruptor).

Laning.
Focus on farming and avoid dying, but don't be afraid to go for kill if you see the opportunity for it.
Storm is not a kind of lane dominator, he is really weak, because despite high armor he has low attack range, so he tries to play passive and get his key items.
Q > E-click > W > E-lick > Step towards enemy > Click + Q..This is max damage during laning stage.
At lvl 5 with 3 points in Q you can easily farm big camp. At low mmr you either do not know when can you farm or just stack to farm later, but it is a bad idea... better to farm in between.

Early game.
Focus on farm to get your core items.
Your 6 lvl just lets you farm more agressively and not be afraid of ganks. Push out midlane and farm the jungle.
Try to stack camps, but don't lose lane wave over it! And better ignore Mudgolems in the jungle until lvl 12.
Do not be on map without resources. Head to the base while farming and spending last mana.
Do not go from Fountain, R to T4 while drinking Bottle once. It will regen buy the time you return to mid.
Get your key items, try to split-push, shut down enemies and take objectives with your team.

Ganking and counter-ganking.
Ganking in Storm in the early game is not the best option (your main goal is farm and hit item timings).
But if you see an opportunity , you can go. Storm ganks in 2 situations:
1) you have mana after Bounty and go to side lane, using Glyph for mid if needed
2) you got awesome active rune
Use Orchid into Counterspell or Lotus Orb while in R.
Carry a TP for counter-ganking.

Runes.
Always play around mid and try to control Runes (= be there around spawn time).
Farm mid wave, big camp and wait for Rune. It is good idea to R to rune even for full mana.
Good Rune - gank. Bad rune like Invis or Illusion? Consider ganking after Bounty.
Arcane lets you do almost everything, your R costs very low.
Regen rune often times is used for farming.

Rotating.
If your team need you to rotate, don't hesitate to help them.
You should rotate when you are:
1) getting ganked a lot and you are unable to fight back;
2) pressured a lot and can't farm the lane.
It if INSANELY important for Storm to check Healing Lotuses. If you abuse backpack you will quickly get full mana.

Mid and late game.
Your main goal is to split-push ( making enemy respond) and gank, so you can snowball. This wil allow you to get Roshan and finish the game.
Your power spikes are items and Roshan. 25-30 min (4th item) is a great power spike!
Look not fall off with lack of items and avoid dying to not lose stacks, Staying ahead on Storm is your main goal on the hero or you willl be useless.
Play around the heroes that can kill you, make them chase you all over the map.
It's very important to get objectives after pick-offs.

Teamfighting.
Use Arcane rune BEFORE R and Regen rune AFTER R
In late game you go in, use Shiva, W to start a fight and get out.
Choosing the right targets and timings will determine your teamfights.

In general, your main goal is to jump on the backline to the enemy with big teamfight contribution that can easily be bursted or help your team to blow up the target.
If you have Aghs you want to jump among enemy to CC them, focus with your team and interrupt thier spell, just don't feel like you alwyas need 4-man Vortex, single one is still good option.
Focus on one target and when it is dead, jump tp another one.
If your target is glimmer-caped, switch to someone else you can kill.
Don't spend too much time on target if it is unkillable or can do tons of damage.
You mostly die when you do not have enough mana (20%) to escape, save it! You may wait near fight like 10 seconds to get more mana before initiating again (like Axe).


Scenario 1. Neither your team, nor you have disables.
You should be the initiator. Jump in, burst someone, your team will follow and the fight is won.

Scenario 2. Enemy has lockdowns and your team has no initiator.
Then, you also have to initiate. But you need to be more careful with your ult and positioning.

Scenario 3. If you have good initiator and enemy has no disables.
Let him jump in and take the front line while you go behind and kill the enemy supports.

Scenario 4. If you have good initiator and enemy has lockdowns.
Before you go in, let your enemy use thier lockdowns first.

Generally, if your team initiates, don't be scared to jump a long distance to get there, as your mana regen will help you to sustain mana for skills and your burst damage can be really important.
If you decided to escape with R, use it one time futher away.

Roshing.
Storm is one of the best Aegis carriers in the game.
It allows him to jump in, create spoace and commit without fear.
Try to initiate on backline or counter-initiate if they attack your main tower-hitter to prevent them from blowing him up.

High ground.
If you initiate badly, you will force bad fight for your team.
Check highgrounds tree for enemy initiators.

Defending.
Try to cut wave with your TP+Ball Lightning combo (or with Kunkka, KotL,...).
Use your ultimate agressively to create space for your team to set up the defense.

Winning.
When you finish the game, get back and R into Ancient giving High-five to be in the centre of the screen!

Greetings, thanks and shoutout to Sammyboy, Huntaela and CCnC (Game-Leap), Ueio, sMn
Enjoy!

Emperor, Russia.