Take your umbrella as it today.

Raining

Explanation:

You use a umbrella when it's raining outside.

Take your umbrella as it rains today

Explanation:

Rains is in the present tense, Unless the sentence was, Take your umbrella as it 'will' rain today

one thousand and one nights, also known as arabian nights is a collection of stories whose basic structure is that of embedded narrative. this technique refers to a main story which works as the common frame - or framing narrative - for the other stories, and then this series of stories which are connected to the main one. this technique can also be referred to as a story within a story. the stories stem from the original tale, some begin and end on their own, some are connected to the previous or following one, by means of questions that are answered in the subsequent tale, or characters which reappear.