Yes a chaser does have the responsibility to warn of an oncoming severe weather event, in an isolated area as well in small town village, where the warning system is still manually operated, ie: I am sure in some small towns there is someone that still pushes the fire whistle button, to alert the local VFD to a call, also the NWR system is far better than it was 10 years ago as far as coverage is concerned, but there are still holes in the coverage, especially in hilly or mountainous locales. Here in the Platte Valley of west central Nebraska we are pretty well covered weather warning system wise, from my house I can hear 3 NWR transmitters easily, and more if conditions permit.