Another way to get answers to questions like this is enter it as a question in Google. If you do a Google search for "current time in Los Angeles" it returns as its first answer:

1:33pm Thursday (PDT) - Time in Los Angeles, California

If you do a Google search for "current time in St. Louis" it returns:

3:34pm Thursday (CDT) - Time in St. Louis, Missouri

So, PDT is 2 hours behind CDT. Thus, 2-3pm PDT is noon-1pm in St. Louis. If you're not on Daylight Saving Time, then move the time back one hour (11-noon).

HTH.

Cheers,
Scott.