You can add the (progressive type) Derecho storm (intense, bow-shaped, rapidly moving line of thunderstorms), that produces heavy damaging straight-line winds (sometimes 90 mph and highter), short-lived weak tornadoes and travels for a long distances.

Favorable conditions to occur :

1. Cold air pull (mesoscale high-presure zone) generated from previous storm
2. The stationary front (not necessary)
3. Moist air

Life stages :

1. Large Strong Tall Echo
2. Bow Echo
3. Comma Echo (with mesoscale convective vortex)
   (last stage not always occures)

Development :

1. Previous storm dies and creating cold air pool, that moves and forces warm, moist air to lift and create convection, that looks like a line and then "bow out" due to the formation of a mesoscale high pressure system which forms within the stratiform rain area behind the initial convective line. This high pressure area is formed due to strong descending air currents behind the squall line, and could come in the form of a downburst.

Another way to form :
2. Flanking line of a supercell thunderstorm evolve into a bow-echo and, if conditions are right, it grows
into Derecho.

Movement :
If the stationary front exists, Derecho moves over it. If the stationary front doesn't exist, Derecho moves in that direction, where first convection started.

Litle facts :

1. If Derecho conected to the stationary front, difference in temperatures between two sides of the front is big (the stationary front between an ice biom and a dessert for example), Derecho will be very powerful.
2. Bow Echo storm can evolve into Derecho in its life cycle.
3. When the mesoscale convective vortex (MCV) appears, and it's strong, it can produse many weak, short-lived tornadoes.
4. MCV can last for several days after disappearing of Derecho and it can start new convective outbreaks,
   and, even worse, if it over warm tropical seas it can grow into a tropical cyclone.

Life cycles in minecraft :
{1}/{2} - Bow Echo -/1- Derecho - MCV - /2\ tropical cyclone/thunderstorm cluster/3.

{1} - (Cold air pool, created by previous storm)
{2} - (Supercell)
/1\ - (Can grow in the power by conction to the stationary front [rare event]){not necessary}
/2\ - (If over sea)
/3\ - (If over land)

Thanks to all, who find some time to read my suggestion)

P.S.
Besides the progressive type Derecho, many other types exists (serial, hybrid), but progressive type is the most practical one for the game.

Damn dude you went all out on it. I like it!