Just checked with the Storm Prediction Center website; this is not a PDS watch—that terminology is typically used with tornado watches versus warnings, and only about five percent of the watches issued annually receive the PDS designation. In layman’s terms, it means a high probability of dangerous, long-track tornadoes; residents in the watch area are well-advised to start preparing and keep an eye on the sky. In some states (Alabama for example), schools often dismiss early when a PDS watch is issued. You don’t want kids trapped in a school or on a bus when violent tornadoes are dropping from the sky.
Having said all that, “tornado emergency” is also a term that is reserved only for the most dangerous situations. Don’t see is used very often and when it is, folks in the affected area need to take shelter immediately—as opposed to running outside with a cell phone to start photographing the storm. In the very near future, we’re going to see some video with the final frames showing a large piece of debris coming straight for the camera.
Prayers up for the folks in Kokomo.