Google often uses the description
meta-tag for the snippet in the SERPs but that is not guaranteed though can be often counted on. If you are using a description
meta-tag and are not pleased by what you see in the SERPs then simply change the description
meta-tag.
However, if the description
meta-tag is empty or missing, you are leaving it up to Google to pick some part of your content for the snippet, you may not like what they select. Having deleted the description
meta-tag, it is quite possible that the snippet may not change for a short period while Google selects a new one. There is a specific algorithm for this that may, repeat, MAY not be event triggered but scheduled. This is simply because it is not normal that the description
meta-tag (and title
tag) is insufficient (in this case gone). It is likely that the h1
tag will be selected if it passes muster. Otherwise it will be the beginning of the first significant paragraph or a snippet that closely matches the title
tag in keyword importance or even the search query.
You just may have to wait for a bit- that is if you are sure that the last fetch was after your change to the description
meta-tag. Otherwise, you will have to wait till the page is fetched again.
On a side note, the description
meta-tag really only effects the snippet in the SERPs and carries virtually no weight on SEO.