With administrator rights open weatherrc (should be in etc/)
The file should have a bunch of entries that look similar to this. I am showing how I created an alias for DFW.
[DFW] #Alias name
City = Dallas Ft Worth #http://tinyurl.com/28pxfg (Find your city)
ID = KDFW #ID code, see note below on how to find it
St = TX #Enter your state's abbreviation
It is easiest to find your ID code by going to http://weather.noaa.gov/ and finding your Current Weather Conditions location. When you have found it look for the four letter identification, that is your ID.
Create your own aliases by adding to the weatherrc file.
Save the file and go to the terminal and type: weather DFW
If you want more information, tell it to be verbose: weather DFW -v
If you want the forecast: weather DFW -f