Recent Results in Thunderstorm Electrification - Figure 4
Fig. 4. The anomalous zones in EW-T parameter space represent regions of charging at low values of EW that are the opposite to their surroundings. They do not always appear, and if they do, can sometimes be associated with an order of magnitude more charge transfer than normal. These zones were originally reported by Saunders et al. (1991) but were not reproducible by others, and caused sufficient contention in the literature that calls for their dismissal were made. They have recently been re-observed in Manchester and confirmed to be a real phenomenon.