How can one distinguish between an organizational weakness and a threat to the organization?

The difference among the threat and the weakness is that the threat is a danger which is an external and the weakness is internal vulnerability

Explanation:

In business, threat is an other company ability to impact negatively the ability of the company in order to achieve the objectives or goals.

For example, the another company or the firm have just released or launched the new product and it performs better as well as good and also costs or the expense is less than the product does, which make it difficult for the company  or the firm to accomplish or achieve the desired sales targets.

Example of the weakness, it is within the company, that the person or the individual will have little research and the development funds available , in order to upgrade the product will be difficult to match the competitor new product.

It could exist in other entities as well, just as the person can harbor the threats