"Numerous daily high temperature records could be in jeopardy of being broken, particularly for California and Nevada. A "Very High" heat risk level (4 out of 4) has been issued across a widespread area of the Southwest. Several locations are looking to set daily high minimum records potentially from Saturday through Monday," said NWS Las Vegas. "This product is supplementary to the official NWS heat watch/warning/advisory program and is meant to provide continuously available heat risk guidance for those decision makers and heat sensitive populations who need to take actions at levels that may be below current NWS heat product levels," said the NWS. Very high heat risk in much of the Southwest from NOAA NWSThe system uses a numeric 1-4 rating and a color scale like that of the Air Quality Index or UV Index.

Source: CNN July 09, 2021 15:10 UTC