\usepackage{ametsoc}
The AMS wants all manuscripts sent to them to be double spaced. So, do this for the paper you are going to send:
\usepackage[final]{ametsoc}
The final option also puts figures and tables at the end and provides a
separate page of figure and table captions.
A second option allows for AMS-type conference papers:
\usepackage[conf]{ametsoc}
In this case, remember that the article class should be:
\documentclass[twocolumn]{article}
In any case, the bibliography style is the same:
\bibliographystyle{ametsoc}
\bibliography{../mybib} %common bib for all papers.