Yeah it seems to do best in a well-mixed low-level environment, which is usually full of sun. A few weeks ago it was showing a marginal severe setup for southern IA. It has temps reaching into the mid 50s, but in reality they ended up about 10 degrees cooler and instead of 500-700 J/kg of cape there was 0. Not sure if it was too aggressive in breaking up the clouds that day or what, but it was way too optimistic with temps.