Prevented from achieving forward motion by an applied force, such as wind. Checked creatures on the ground merely stop. Checked flying creatures move back a distance specified in the description of the effect.

Table 3–24: Wind Effects

Wind Force Wind Speed Ranged/ Normal and Siege Weapon Attack Penalty Creature Size Wind Effect on Creature Fort Save DC
Light 0 -10 mph 0 / 0 Any None 0
Moderate 11-20 mph 0 / 0 Any None 9
Strong 21- 30 mph -2/ 0 Tiny or Smaller Knocked Down 10
/ Small or Larger None 10
Severe 31- 50 mph -4/ 0 Tiny Blown Away 15
/ Small Knocked Down 15
/ Medium Checked 15
Windstorm 51- 74 mph Impossible/–4 Small or smaller Blown Away 18
/ Medium Knocked Down 18
/ Large or Huge Checked 18
/ Gargantuan or Colossal None 18
Hurricane 75- 174 mph Impossible/–8 Medium or smaller Blown Away 20
/ Large Knocked Down 20
/ Huge Checked 20
/ Gargantuan or Colossal None 20
Tornado 175- 300 mph Impossible/Impossible Tiny Blown Away 30
/ Huge Knocked Down 30
/ Gargantuan or Colossal Checked 30

1 The siege weapon category includes ballista and catapult attacks as well as boulders tossed by giants.
2 Flying or airborne creatures are treated as one size category smaller than their actual size, so an airborne Gargantuan dragon is treated as Huge for purposes of wind effects.
Checked: Creatures are unable to move forward against the force of the wind. Flying creatures are blown back 1d6×5 feet.
Knocked Down: Creatures are knocked prone by the force of the wind. Flying creatures are instead blown back 1d6×10 feet.
Blown Away: Creatures on the ground are knocked prone and rolled 1d4×10 feet, taking 1d4 points of nonlethal damage per 10 feet. Flying creatures are blown back 2d6×10 feet and take 2d6 points of nonlethal damage due to battering and buffeting.

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