I issued my first warnings today on storms that I have been watching.  I watched the Prob Severe product for awhile and saw the storms grown from10% to above 50% and had MESH growing from .08″ to 1″ and above.  That is when I issued the warnings.  I created the polygons based on watching the radar loop and so far the western polygon warned area verifed with 1″ hail in Urbana.  Hopefully the other one does too! ~Vollmar