To Develop: 450,000 gp; 9 days; 18,000 XP. Seeds: 
energy (fire) (DC 19), 
energy (weather) (DC 19). 
Factor: change rain to wisps of flame (ad hoc +12 DC).
 
This spell summons a swirling thunderstorm that rains fire rather than raindrops down on the character and everything within a two-mile radius of him or her. Everything caught unprotected or unsheltered in the flaming deluge takes 1 point of fire 
damage each round. A successful Reflex save results in no 
damage, but the save must be repeated each round. Unless the ground is exceedingly damp, all vegetation is eventually blackened and destroyed, leaving behind a barren wasteland similar to the aftermath of a grass or forest fire. The fiery storm is stationary and persists even if the caster leaves.