Lightning Strike / Thunderstorm Plotting

Below is a static image from a lightning detection system. The center point is the weather station location here. This image will refresh every 90-seconds. Java is required for the 60-second, auto-refresh console here, or there is a Flash version on the live weather station page (click the "Lightning" button at the bottom of that page).

LEGEND
+CG = cloud-to-ground lightning positive (+)
-CG = cloud-to-ground lightning negative (-)
+IC = cloud-to-cloud lightning positive (+)
-IC = cloud-to-cloud lightning negative (-)

The type and polarity of new strikes are indicated by symbols, as illustrated in the legends. Dots that fade in color from yellow through dark red indicate older strikes. The correlation between time and color can be found in the legend. Electrical storm severity may be determined by strike rate and symbol density.