If you watch the storm cloud system formation, it is spontaneous during this time of year. It changes literally in minutes. there can be no rain at your location and 2 inches a mile away. Nothing/Nobody can predict that with even 50% accuracy.
The weather channels need to shock/scare you into watching (by getting your attention) like every other A/V channel. They use to use pretty/shapely weather girls but that is no longer politically correct
"Dog Bites Man" gets no views..."Man Bites Dog" gets millions of views.