Primal Hail: The enviroment is starting to actually fully freeze, leading into the speed of all Pokémon that are not Ice or Flying type or have an ability related to this weather (like Overcoat) or Levitate to be reduced by 25%
Flying/Levitate users take twice the normal damage of Primal Hail, unless they are forced to be vulnerable to Ground type moves by Gravity or Iron Ball, or have the ability Magic Guard, of course.
And all Ice type moves become super effective against Water type Pokémon while it lasts, while also turning all Water type moves into Ice type and reducing by 25% the power of Fire type moves
All Ice type moves also get a boost of 50% in power and probabilities of freezing by moves with such chance are increased by 30%
For example, Ice Beam normally has a 10% chance of freezing, adding 30% leads to 40%
And let´s not talk about Triattack getting a 100% chance with Serene Grace
Primal Sandstorm: The enviroment is starting to fill with mud, reducing the accuracy by 15% of all Pokémon that aren´t Ground, Rock, Steel type or have an ability for using such weather to their advantage/ignore it, also includng Keen Eye.
Flying/Levitate users take twice the normal damage of Primal Sandstorm, unless they are forced to be vulnerable to Ground type moves by Gravity or Iron Ball, or have the ability Magic Guard, of course.
Ground, Steel and Rock type moves get a boost of 50% in power, while the power of Flying type moves is decreased by 50% unless an ability for ignoring weather is around (Overcoat and Air Lock, for example)