Western U.S. in the Midst of Torrid Heat Wave

Torrid heat will persist west of the Rockies and into the southern Plains through Wednesday.

The current, near-stagnant high pressure dome over these vast regions will continue to bake the ground from the Desert Southwest all the way to the Canadian border with anomalous heat. Afternoon highs are expected to reach 100 to 115 degrees across the Desert Southwest and the southern High Plains, with isolated basins in the Sonoran Desert nearly grazing the 120-degree mark. 

Other valleys and lower-elevation locations across the Intermountain West are expecting to soar into the 90s and low 100s. With relatively dry conditions in place, heat index values will generally be close to the actual air temperature.

Many low temperatures in the Southwest will not fall much below the 90-degree mark, while overnight lows in southern Plains bottom out in the middle to upper 70s. Warm low temperatures such as these, when combined with high humidity, can lead to an increased risk of heat-related illness, and could have an impact on power, water, and transportation systems.

Extreme Heat Warnings and Heat Advisories are in effect throughout much of the West. Areas to be affected include valleys just east of the southern Pacific Northwest's coastal ranges, valleys in the Four Corners region, the San Joaquin Valley, the Sonoran Desert, the Mojave Desert, and parts of the Great Basin.

If you are in one of these areas experiencing extremely hot temperatures, it is exceptionally important to stay hydrated and cool. Avoid exposure to the sun from late morning into the early evening. Make sure to take frequent breaks in the air conditioning or shade, eat and dress lightly, and to use sun protection if outdoors. Always check the back seat before exiting your car, as a vehicle can reach 30 to 40 degrees higher than outdoor temperatures. Never leave kids or pets unattended and remember to “Look Before You Lock!”