A rapidly growing storm developed over Putnam county IL and is slowly shifting eastward into La Salle county IL. The lightning jump algorithm has indicated as much as a 5 sigma increase with this storm. The CIMSS Prob Severe Model has indicated a high probability of severe storms over Putman and La Salle County.  See images of below, including the the severe thunderstorm warning issued for La Salle County.

-Wacha