Why tornadoes are hitting parts of the West that almost never get them

Tornadoes keep hitting the West, including Santa Fe, New Mexico, northern Arizona and Utah, as Pacific tropical moisture feeds slow-moving upper lows. A tornado with winds up to 110 mph hit Santa Fe on Oct. 24, and northern Arizona had its first tornado watch in more than 16 years. Sirens are sparse in the West, so here's how to use Wireless Emergency Alerts and know a watch from a warning.