the difference between "In case that" and "In the case that"

[Ichiro]

Could you please tell me the difference between these two phrases:

1. In case that ...
2. In the case that ...

I googled these two phrases in order to see which is more common,
and found that the numbers of websites hit were almost the same.
So, I now assume native speakers use these in different meanings.
However, I am not sure which phrase sounds better in what situation.

Thank you.

[Yankee]

Hi

The phrase 'in case' is used in an explanation of why you do something, and 'in case' refers to the reason -- i.e. because a situation is theoretically possible, usually later:
I have my umbrella with me (now) in case it rains (later).

The phrase 'in the case' simply refers to a specific situation (case).

If the word 'that' follows either one of the phrases above, it should be parsed with something else in the sentence (rather than with the phrases above).
.

[Ichiro]

I understand the difference clearly. I checked some sentences which had these phrases and your explanation makes sense.
I appreciate your help.
Thank you.