Next chase day Monday May 21?

The GFS model (available here: http://www.weather.cod.edu/forecast/) is showing a trough moving into the northern plains and overspreading capes up to 2000 J/kg in the western NE area. At this time the trough is rather weak but if it could strengthen and dig a little further south we could have a decent severe weather event.

The day before (sunday) and day after (tuesday) bears watching as well. SPC's day 4-8 outlook is also now picking up on this storm system: http://www.spc.noaa.gov/products/exper/day4-8/