FSD – CTC signature just east of CWA at 1930z

Forecaster comments from EWP blog...

Watching convection developing just past the FSD CWA line in Des Moines area as Cloud Top Cooling is showing a steady decrease in cloud top cooling rates from -8 degrees C/15 minutes over Pocahontas County IA at 1915z to -19 degrees C/15  minutes over Palo Alto County IA at 1932z.

Here is the KFSD reflectivity and enhanced echo top. Echo top was up to 37 kft on the storm in Pocahontas County IA at 1950z.

Update…this appears to be a false alarm as cell has continued to weaken and no cloud to ground lightning was indicated. Echo top reached 39kft before collapsing.