11-12: High Winds and Rain
Fluctuating wind speeds and driving rain make navigating the sky nearly impossible...and dangerous!

All skimmers and jump pack troops may only move a maximum of 10". In addition to this, scatter the model D6 inches in a random direction after moving (use the Scatter die). This wayward movement does not affect how many weapons a skimmer can fire, only its movement. Jump pack troops may elect to not use their packs if they want to play it safe and just walk. Keep in mind the difficult/impassible terrain effects when scattering skimmers and jump pack troops.

13-14: Acidic Rain
The atmosphere of this planet is heavily polluted and the resulting rainfall is highly corrosive. Exposed metals and armour pieces can be eaten away with frightening speed. If a vehicle is sheltered from the rain by a hangar, rocky overhang, forest, or the like, then it is protected and does not suffer from the following corrosive rain effects.

At the start of each player's turn, roll for armour Penetration against every vehicle on the table. This counts as an S5 hit against the lowest armour Value present on the vehicle. Open-Topped vehicles count this damage as an S6 hit instead. Glancing Hits caused in this manner will ignore results of 5 and 6. Penetrating Hits ignore results of 4,5, and 6. In both cases (glancing and penetrating) keep rolling until you get a valid result.

15: Meteorite Storm
The sky is alight with streaking meteorites from some celestial disturbance. The havoc these random hunks of fused space rock can cause on the battlefield is tremendous.

Randomly determine the placement of D6 meteorites at the start of each game turn. Use the small blast template for each falling meteor. Determining the placement of each meteor is completely up to you. You can designate a few "hot spots" on the table and scatter from there, throw the small blast templates at the table (not recommended, but fun), drop Styrofoam balls from a specific height, or some other method your warped mind can devise.

Once you determine where the meteor ends up, any model under the centre circle of the small blast template takes an S10 AP1 hit. Models touched by the rest of template suffer an S6 AP3 hit. If you can, try representing each meteor hit with an impact crater on the tabletop!

16: Toxic Clouds
The very atmosphere is deadly! Pockets of various gaseous toxins drift across the battlefield sowing confusion and terror. Place a pair of large blast templates (the toxic clouds) in the centre of the table after the armies are deployed. At the start of each game turn, move the clouds by rolling the Scatter die and 2D6 for distance in inches. Any models the template moves over during its travels may be affected. The toxic cloud does not hinder line-of-sight in any way.

- 1-3: Flesh Eating
This type of toxic cloud is dangerous only to exposed flesh. Cries of, "Oh no, the commander's lost his face," are pretty common in these conditions. The cloud affects a model with any skin showing on the actual model itself. This means you "Mr. I'm a Space Marine Commander, I don't need a helmet" and pretty much every unfortunate Imperial Guardsman in the galaxy. Fully enclosed models may ignore the effects of the cloud. Models touched by the cloud as it drifts suffer an S3 hit with no saving throw allowed.

- 4-5: Metallic Terror
This type of toxic cloud is dangerous to vehicles and things like Terminators and Crisis Battlesuits (use your best judgment and determine these oddball "vehicles" before the game begins). Models touched by the cloud as it drifts suffer an S5 hit against the lowest armour Value present on the vehicle. Open-Topped vehicles count this damage as an S6 hit instead. Glancing Hits caused in this manner ignore results of 5 and 6. Penetrating Hits ignore results of 4,5, and 6. In both cases (glancing and penetrating) keep rolling until you get a valid result.

- 6: Both!
Treat the cloud as both Flesh and Metallic Terror. It's a hungry lil' toxic cloud.