When the blood ph is raised or lowered and the source of acid does not involve the respiratory system it is considered

When the blood pH is raised and lowered and the source of acid does not involve the respiratory system it is considered metabolic. When there is too much acid in the blood it is called acidosis. When there is too little, it is called alkalosis. 

Nimbostratus is the correct answer.
explanation: nimbostratus clouds are the type of clouds that are mostly likely present on gray, rainy day. these clouds produce continuous rain, snow and there is no thundering or lightening either.