A look at a nationwide composite of NWS NEXRAD RADAR information these past few days would show lots of scattered activity over the continental US. The featured chart looks at the climatology using the past 20 years of composite images of reflectivity returns at or above 35 dbZ. At this level and higher are your typical very rain showers and thunder showers. Summer clearly has the highest values with coverage values 3-4 times that of what we see during the winter season. The slope downwards is very steep as we start transitioning into fall during September. Thundershowers are currently visiting Iowa with more expected later today.

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Tags:   nexrad