Issued all the time before a storm, to warn people something's approaching. Seen it many times where a watch is issued and turns into an advisory, not a warning
Nice! Yeah, my 77 Westfalia still has the gas heater. Its next in line for resto. My 83 van has a factory auxiliary diesel heater. I'll heat the interior from 30° to about 70° in a few minutes!
It completely depends on size and brand. Most units I've ordered have come in within six weeks. I do have one that has been on order for two months and still waiting, however its supposed to be in soon. Probably once we actually have snow on the ground
LOL...well, I have two beetles both 1975s a 77 camper and an 83 Vanagon Diesel. I restored that green one in my garage including paint. Its gone to shows 300 miles from home no problem!