What is the 'Puelche' (or 'Raco' in the central valleys) along the Chilean coastline, and what are its meteorological characteristics?

1. A dry, warm, gusty down-slope katabatic (foehn-type) wind blowing from the Andes Mountains toward the coast, causing rapid humidity drops, temperature spikes, and sudden gusty offshore conditions
2. A freezing cold blizzard blowing directly from the Antarctic ice sheet into Valparaíso
3. A dense marine fog that forms over the ocean at noon and covers coastal beaches
4. A persistent rainstorm lasting for three consecutive weeks in the Atacama Desert