import urllib
import re
htmlfile=urllib.urlopen("http://forecast.weather.gov/product.php?site=NWS&issuedby=FWD&product=RR5&format=CI&version=1&glossary=0")
htmltext=htmlfile.read()
regex='<pre class="glossaryProduct">(.+?)</pre>'
pattern=re.compile(regex)
out=re.findall(pattern, htmltext)
print (out)