ok, i made the dust, but i am not 100% sure what you mean how 2 do it wiht the roof etc...i can make that there fly around some smaller object at the begin...thats easy

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Code:

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bmap tornado_bmap = <sprite.tga>;
bmap small_bmap = <particle.tga>;

function tornado_particles;
function small_particle;

function tornado_sprite()
{
	var distance;
	var distance_add;
	var max_alpha = 40;
	my.facing = on;
	my.transparent=on;
	my.alpha=0;
	my.passable = on;
	my.unlit=on;
	my.light=on;
	my.red=70;
	my.green=50;
	my.blue=30;
	while(my.skill3 == 0)
	{
		wait(1);
	}
	distance_add=random(0.7);
	while(1)
	{
		distance + = distance_add*time;
		my.skill2 + = my.skill1 * time;
		you = ptr_for_handle(my.skill3);
		
		if(abs(my.z-your.z)>1000)
		{
			my.alpha-=0.5*time;
			if(my.alpha < 0){wait(1);ent_remove(me);return;}
		}
		else
		{
			my.alpha = min(my.alpha+time,max_alpha);
		}
		my.x = sin(my.skill2)*distance + you.x+20*sin(my.z+your.pan);
		my.y = cos(my.skill2)*distance + you.y+20*sin(my.z+your.pan);
		my.z += random(5)*time;
		if(total_ticks%5<1)//all 5 ticks
		{
			my.scale_x += 0.002;
			my.scale_y += 0.002;
		}
		if(random(40)>39.9)
		{
			effect(tornado_particles,2,my.x,nullvector);
		}
		my.roll + = my.skill1*time;
		wait(1);
	}
}

function move_tornado
{
	var position[3];
	var new_pos[3];
	new_pos.x=random(5)-2.5;
	new_pos.y=random(5)-2.5;
	while(1)
	{
		if(random(10)>9.9)//new dir
		{
			new_pos.x=random(5)-2.5;
			new_pos.y=random(5)-2.5;
		}
		position.x += (new_pos.x-position.x)*0.1*time;
		position.y += (new_pos.y-position.y)*0.1*time;
		my.x += position.x*time;
		my.y += position.y*time;
		my.pan+=5*time;
		wait(1);
	}
}

function tornado_paritcle_func
{
	if(my.skill_a==1)
	{
		my.alpha+=time;
		if(my.alpha>5)
		{
			my.skill_a=0;
		}
	}
	else
	{
		my.alpha-=time;
	}
	my.size += 20*time;
	my.x = your.x - 10*sin(total_ticks);
	my.y = your.y - 10*cos(total_ticks);
	effect(small_particle,1,vector(my.x+50-random(100),my.y+50-random(100),my.z+50-random(100)),vector(0,0,-0.125));
	if(my.alpha<0)
	{
		my.lifespan=0;
	}
}


function tornado_particles
{
	my.bmap = tornado_bmap;
	my.function=tornado_paritcle_func;
	my.transparent=on;
	my.size = 200;
	my.alpha=0;
	my.skill_a=1;
	my.red=20;
	my.green=10;
	my.blue=5;
}

function small_particle_func
{
	my.alpha-=time;
	my.x = your.x +50-random(100);
	my.y = your.y +50-random(100);
	if(my.alpha<0)
	{
		my.lifespan=0;
	}
}

function small_particle
{
	my.size=0.5;
	my.function = small_particle_func;
	my.red=20;
	my.green=10;
	my.blue=0;
	my.bmap = small_bmap;
	my.streak=on;
	my.move=on;
	my.transparent = on;
}

function dust_func
{
	my.alpha-=time;
	my.size+=time;
	if(my.alpha<0)
	{
		my.lifespan=0;
	}
}

function dust
{
	my.size = 50;
	my.function = dust_func;
	my.bmap = tornado_bmap;
	my.vel_x = 4-random(8);
	my.vel_y = 4-random(8);
	my.vel_z = random(1);
	my.move = on;
	my.transparent = on;
	my.alpha=40;
	my.red=40;
	my.green=25;
	my.blue=12.5;
}

action tornado()
{
	my.passable = on;
	my.invisible = on;
	//move_me here^^
	move_tornado();
	while(1)
	{
		
		you = ent_create("sprite.tga",my.x,tornado_sprite);
		you.skill1 = random(10)+2;
		you.skill2 = random(360);
		you.scale_x = 0.125;
		you.scale_y = you.scale_x;
		you.skill3 = handle(my);
		effect(dust,1,my.x,nullvector);
		wait(-random(0.2));
	}
}

function main
{
	fps_max=75;
	level_load("tornado.wmb");
	wait(3);
	randomize();
	while(1)
	{
		camera.pan -= mouse_force.x;
		camera.tilt += mouse_force.y;
		temp.x = (key_w-key_s+mickey.z/10)*15*time;
		temp.y = (key_a-key_d)*15*time;
		temp.z = 0;
		vec_rotate(temp,camera.pan);
		vec_add(camera.x,temp);
		wait(1);
	}
}

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