WEST - An upper-level ridge has led to very warm temperatures in the western U.S. Dozens of records are expected, each city represented by a pink dot (above) is a location where record highs could be broken or tied. Records have been falling since Mother's Day, including spots on Monday like Salt Lake City that hit 92°.

Excessive Heat Warnings and Advisories remain in place for the southwest through tonight. Keep practicing heat safety as the week gets off to a hot start.
Spots like Las Vegas and Phoenix will dig into the 100s on Tuesday. Even areas as far north as Boise could threaten the century mark. If they get to 98 Tuesday afternoon, it will not only be the earliest on record, but beat the average first 98 by almost 6 weeks!!
The heat will slide east as the week progresses. Highs in the Central and High Plains will soar into the 90s, threatening records here as early as Tuesday afternoon. Denver normally averages 69°, and will see a high of 90° on Wednesday.
