The strong storm in the Glasgow area weakened when it became elevated north of the warm front.  Other cells tried to initiate along an arcing outflow boundary southeast of the original storm.  These new cells were never a threat to produce severe weather.  Rather than chasing new mediocre cells in western and central Montana, we made the decision to end the IOP, and return to the more fruitful archive cases.

Patrick Burke (EWP Weekly Coordinator, 18-22 May 2009)