Skywarn are mostly crazy ham radio operators who climb on their roofs when sane people are going down into their basements. Before modern doppler radars their sightings were the primary source for tornado warnings.
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You can’t look at a radar display, even the modern doppler
one and point at a spot and say “here is a tornado”. Thats
why they still need trained observers. I’ve never climbed
up on my roof, but I have drove to higher ground for a better
field of view.
Mike
N8KAH