In reference to Eric's question, I'm not sure exactly how the RUC incorporates observed data into it's analysis (i.e. QC, which obs) However, the 00Z DVN sounding showed a SB CAPE of 6813 J/KG with an 89/80 surface temp. Temps in central Iowa were into the mid to upper 90s with similar if not higher dew points at some Iowa Environmental Mesonet sites (i.e. AWOS, RWIS). I'd say the RUC did a good job with the CAPE. Explosive isolated convection did develop northeast of DVN which became severe. Forcing likely due to outflow boundary convergence where the cap is weaker. The cap is holding strong otherwise further north and west. Our debate here has always been how deep this moisture during the afternoon is getting with evapotranspiration certainly contributing in large part to today's dew points.

Andy Kula
NWS Des Moines IA