Mud 1 and Mud 2 textures by: Unity Technologies and their "Viking Village" Demo
Grass 1 and Forest textures by: Unity Technologies and their "The Blacksmith" Demo
Weather Icons by: MerlinTheRed on deviantart.com
Thunder sounds by: juskiddink from freesound.org
Lightning strike sound by: Unity Technologies and their "Tower Defense Template" Demo
Wood and Rock_1_D texture from: Textures.com
LightningParticle, ParticleCloudBlack, ParticleCloudWhite, ParticleFirecloud, ParticleFlamesSheet, 
ParticleFlare, Hail, Mist, and Rain Splash texture by Unity Technologies and their "Unity Particle Pack" Asset